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Blarina

Blarina is a genus of relatively large shrews in the family Soricidae, subfamily Soricinae, and tribe Blarinini, comprising five extant species endemic to North America: the northern short-tailed shrew (B. brevicauda), southern short-tailed shrew (B. carolinensis), Elliot's short-tailed shrew (B. hylophaga), Everglades short-tailed shrew (B. peninsulae), and Sherman's short-tailed shrew (B. shermani).^[1] These shrews are distinguished by their robust, cylindrical bodies measuring 7–13 cm in length (including a short tail of 1–3 cm), velvety fur typically grayish-brown above and paler below, small eyes and concealed ears, and a pointed snout adapted for fossorial and terrestrial foraging.^[2] Native to habitats across the eastern and central United States and southern Canada, they prefer moist, vegetated areas such as deciduous and mixed forests, grasslands, brushy fields, and forest edges with ample leaf litter or ground cover for burrowing and concealment.^[3]^[4] A defining feature of the genus Blarina is its members' production of a potent neurotoxic saliva, unique among North American mammals, secreted from enlarged submaxillary glands and delivered via grooved lower incisors to subdue invertebrate and small vertebrate prey.^[5]^[6] This venom, composed of proteins like blarina toxin, can immobilize animals several times their size, such as mice or salamanders, facilitating predation on earthworms, insects, centipedes, and occasionally carrion or seeds.^[6] With high metabolic rates requiring near-constant feeding (up to their body weight daily), Blarina shrews exhibit aggressive, territorial behavior, constructing elaborate underground burrow systems for nesting and storing food.^[7]^[8] Their fossorial adaptations, including strong forelimbs and 32 red-tipped teeth for grinding tough exoskeletons, enable them to thrive in diverse ecological roles as both predators and occasional prey for owls, snakes, and mammals.

Taxonomy

Etymology

The genus Blarina was established by the British zoologist John Edward Gray in 1838 as a subgenus within the shrew genus Sorex (previously classified under Corsira), in his systematic revision published in the Proceedings of the Zoological Society of London.^[9] Gray introduced the name to distinguish a group of North American short-tailed shrews characterized by their robust build and reduced tail length compared to other Sorex species.^[10] Gray designated the type species of Blarina as Corsira (Blarina) talpoides Gray, 1838, which was based on Sorex talpoides Gapper, 1830—a junior synonym of Sorex brevicauda Say, 1823, now recognized as Blarina brevicauda, the northern short-tailed shrew.^[11] This designation anchored the subgenus to specimens from eastern North America, reflecting Gray's effort to reorganize the diverse and often confused taxonomy of soricids based on morphological traits like dentition and pelage.^[12] In 1842, French naturalist René Primevère Lesson elevated Blarina to full generic status in his Nouveau tableau du Royaume Animal, separating it definitively from Sorex due to differences in cranial structure and tail proportions. Subsequent reclassifications, particularly in the late 19th and early 20th centuries, refined the genus's boundaries; for instance, Merriam's 1895 revision of American shrews confirmed Blarina as distinct from related genera like Notiosorex and incorporated additional species based on geographic variation.^[13] Today, Blarina remains a well-defined genus in the family Soricidae, encompassing five extant species primarily distributed across North America, though the specific status of B. peninsulae (as a full species or subspecies of B. carolinensis) remains debated based on karyotypic and genetic evidence as of 2025.^[14]

Classification

Blarina is classified within the kingdom Animalia, phylum Chordata, class Mammalia, order Eulipotyphla, family Soricidae, subfamily Soricinae, tribe Blarinini, and genus Blarina.^[3]^[15]^[16] The genus belongs to the red-toothed shrews, characterized by reddish pigmentation on their teeth due to iron deposits, a trait shared across the subfamily Soricinae.^[17] Phylogenetically, Blarina forms a monophyletic group within Soricidae, with molecular analyses confirming its close relationship to other North American soricines; specifically, the genus is positioned as sister to Cryptotis, the small-eared shrews, based on mitochondrial cytochrome b sequences and broader soricid phylogenies that place both genera in a clade distinct from Old World soricines like Sorex.^[18]^[19] This positioning reflects a shared evolutionary history in the Nearctic region, with Blarina diverging from Cryptotis-like ancestors during the late Miocene to Pliocene transition, though some studies suggest potential affinities to Notiosorex in broader tribal rearrangements.^[20] The fossil record of Blarina extends from the late Pliocene to the Recent, with ancestral forms emerging from the blarinine stem in the middle to late Pliocene, as evidenced by early records like Blarina gidleyi from Idaho deposits.^[11]^[21] Key Pleistocene fossils include those attributable to Blarina carolinensis, known from over 25 sites across nine U.S. states, indicating a historical range expansion northward during interglacial periods before post-Pleistocene retraction.^[22] The genus's paleobiogeography shows persistence in both warm-moist and cool-moist faunas through the Blancan to Rancholabrean land-mammal ages, underscoring its adaptability amid Quaternary climate shifts.^[23]

Description

Morphology

Members of the genus Blarina are robust, short-legged shrews characterized by a cylindrical body, long pointed snout, and short tail, distinguishing them from other North American soricids.^[24] Across the five species, total length ranges from 70 to 140 mm, with head and body lengths typically 66–110 mm and tail lengths of 12–30 mm; weights vary from 5 to 30 g, with B. brevicauda being the largest and B. peninsulae the smallest.^[25]^[26]^[24]^[27]^[1] These dimensions reflect adaptations for a fossorial lifestyle, with larger body sizes in northern species correlating to colder climates.^[24] The pelage is dense and velvety, providing insulation and camouflage; dorsal fur is typically grayish-brown to slate-gray, often with a silvery tinge, while ventral fur is paler gray.^[25]^[24]^[26] Seasonal variation occurs, with winter pelage darker and thicker than summer coats.^[25] Cranially, Blarina shrews possess a robust skull with a broad braincase and short rostrum, adapted for powerful jaw action; eyes and ears are small and concealed in the fur, emphasizing reliance on other senses.^[24]^[26] The dental formula is I 3/1, C 1/1, P 3/1, M 3/3 = 32 teeth, featuring red pigmentation on the tips of the upper incisors, which may aid in identification and is unique among soricines.^[24]^[26] The tail is short, comprising less than 50% of head and body length, and covered in fine hair, aiding balance during burrowing.^[24]^[28] Limbs are short with thick forefeet equipped with strong claws for digging tunnels and soil turnover, while hind feet are narrower for propulsion.^[25]^[24]

Physiology

Blarina species possess exceptionally high metabolic rates, among the highest recorded for mammals, which demand continuous energy intake to prevent starvation. Individuals must consume food equivalent to up to three times their body weight daily and feed every 2-3 hours to maintain vital functions, as their small size results in rapid heat loss and fuel depletion.^[29]^[30]^[31] This elevated metabolism supports their active lifestyle but limits survival without food to mere hours, with full body fat turnover occurring in 9-24 hours depending on age and season.^[29] To buffer against short-term scarcity, Blarina can store fat reserves, particularly during summer, enhancing overwinter survival.^[32] A distinctive physiological adaptation is the venom system, centered in the enlarged submaxillary salivary glands, which secrete blarina toxin (BLTX), a 4.6 kDa peptide exhibiting kallikrein-like serine protease activity.^[33] BLTX enhances catalytic efficiency compared to non-toxic homologs, leading to prey immobilization through mechanisms such as a precipitous drop in blood pressure (hypotension) and induced hypokinesia, resulting in paralysis without direct neurotoxic effects.^[33]^[34] This venomous capability, rare among mammals, facilitates efficient subduing of larger or more mobile prey.^[33] Sensory physiology in Blarina emphasizes olfaction and tactile perception over vision. The olfactory system is acute, aiding in prey detection and environmental navigation, while vibrissae on the snout provide highly sensitive touch cues for foraging in low-light or cluttered habitats.^[31] Vision plays a minor role, with small, degenerated eyes limiting resolution to basic light detection.^[31]^[35] For thermoregulation, Blarina maintain euthermy through a high basal metabolic rate augmented by the heat increment of feeding, where postprandial oxygen consumption rises by approximately 18% for up to 2 hours, elevating body temperature by 0.6°C to offset cold exposure.^[36] During food scarcity, they can enter reversible hypothermia or shallow torpor, reducing metabolic demands to conserve energy, though this is less pronounced than in smaller soricines.^[37]^[38]

Distribution and habitat

Geographic range

The genus Blarina is endemic to North America and occupies a broad continental range across eastern and central regions, extending from the Canadian provinces of Nova Scotia and New Brunswick in the east to southern Saskatchewan in the west, and southward through the central and eastern United States to eastern Texas and south-central Florida.^[39] This distribution is primarily confined to areas east of the Rocky Mountains, with the genus reaching its western limits in the Great Plains.^[39] The latitudinal extent of Blarina spans roughly 26°N to 50°N, encompassing diverse physiographic provinces from the Appalachian Mountains to the Mississippi River valley, though some northern populations exhibit disjunct occurrences separated by unsuitable habitats.^[40] Species-specific ranges within the genus vary, with B. brevicauda dominating the northern portions and B. carolinensis and B. shermani confined more southerly, as detailed in subsequent sections.^[40] Fossil records provide evidence of post-Pleistocene range expansions for Blarina, with late Pleistocene specimens from sites in Florida and Virginia indicating persistence in southern refugia during glacial maxima, followed by northward recolonization as ice sheets retreated approximately 10,000–15,000 years ago.^[41] Phylogeographic analyses further support this pattern, revealing genetic signatures of historical fragmentation and subsequent demographic expansions across formerly glaciated landscapes in eastern North America.^[40]

Habitat preferences

Blarina shrews exhibit a semifossorial lifestyle, primarily inhabiting moist, vegetated environments that provide suitable conditions for burrowing and cover. They favor deciduous forests, grasslands, shrublands, and the edges of wetlands, where dense understory vegetation and leaf litter layers offer protection and microhabitat stability. These habitats are typically mesic, with consistent moisture supporting the invertebrates that form a key part of their ecosystem, though the shrews avoid extremes of aridity or saturation.^[25]^[3]^[42] Soil composition is critical for Blarina species, as their semifossorial habits require loose, friable substrates that allow efficient tunnel construction and navigation. They thrive in damp but well-drained soils rich in organic matter, such as those under forest humus or grassy litter, and actively avoid dense clay soils that impede digging or periodically flooded areas that could collapse burrows. This preference for workable earth enables them to create extensive subterranean networks, often just below the surface or deeper in stable ground.^[42]^[43] Within their North American distribution, Blarina shrews occur from lowlands to higher elevations, reaching up to approximately 1,300 m in mountainous regions like the Appalachians, where they continue to select sites with abundant understory cover and leaf litter for concealment.^[44]^[45]^[46] This altitudinal tolerance reflects their adaptability to varied terrains, provided the core requirements of moisture and soil friability are met.

Behavior

Activity patterns

Blarina species exhibit a polyphasic activity pattern characterized by short bursts of activity interspersed with periods of rest, driven by their exceptionally high metabolic rates that necessitate frequent foraging to meet energetic demands. Observations indicate bimodal peaks in activity, typically occurring shortly after sunset and before sunrise, though individuals remain active to varying degrees throughout the 24-hour cycle, with overall activity comprising only about 16% of the day. This pattern aligns with their strongly nocturnal tendencies under entrained light-dark cycles, but free-running rhythms in constant conditions reveal persistent low-level activity without strict ultradian feeding bouts.^[47]^[11] As semifossorial mammals, Blarina navigate both surface runways—often those created by larger mammals like voles—and subsurface tunnels within the top 10–50 cm of soil, facilitating efficient movement in leaf litter, soil, or under snow. Their locomotion involves quick, jerky runs with sudden stops, enabling bursts of speed reaching up to 4.25 m/s in juveniles during escape or exploration, though average travel is more measured to conserve energy. They also employ ultrasonic vocalizations for echolocation to navigate in low-visibility conditions. These movements support territorial defense, with individuals patrolling home ranges averaging about 2.5 ha (0.1–1.8 ha depending on habitat and sex) during active periods.^[11]^[48]^[25] Seasonally, activity levels decline in winter, where Blarina enter near-torpid states during inactive periods, reducing metabolic rate, body temperature, and locomotion to cope with cold and limited food availability, often relying on subnivean foraging under snow cover. In contrast, activity intensifies during the breeding season (typically April to October), with increased foraging and movement to support reproduction, though overall patterns remain influenced by temperature, showing greater daytime consistency in colder conditions. Blarina shrews exhibit a predominantly solitary lifestyle, with adults maintaining exclusive territories that are vigorously defended against intruders. These territories are roughly comparable to their home range sizes and allow residents to monopolize resources while minimizing energy expenditure on defense.^[50] Territories are primarily defended through scent marking along boundaries using specialized dermal glands, which deters nomadic individuals from entering, and through vocalizations such as high-pitched chirps and trills that serve as warning signals during encounters.^[50] Populations of Blarina consist of a mix of resident individuals, who occupy stable territories, and nomadic shrews that wander between areas, particularly during periods of low prey availability. Population densities vary with habitat quality, typically ranging from 5 to 30 individuals per hectare in optimal old-field or forested environments, though they can fluctuate dramatically up to over 100 per hectare in peak conditions.^[51] Aggression is a key aspect of social interactions, with frequent fights occurring between residents and intruders, often involving chases, threats, and venomous bites delivered via the shrew's specialized salivary glands. These bites, containing a potent neurotoxin, can incapacitate rivals and reinforce territorial boundaries, though such confrontations are energetically costly.^[50]^[52] Rare instances of communal nesting have been noted among females, particularly during lactation, where tolerance of conspecifics may temporarily override solitary tendencies to share burrow systems for protection.^[51] Territorial patrols are influenced by the shrews' polyphasic activity cycles, with increased vigilance during crepuscular periods to monitor boundaries.^[50]

Ecology

Diet and foraging

Blarina species exhibit a primarily carnivorous and insectivorous diet, consisting mainly of invertebrates such as earthworms (annelids), snails (gastropods), lepidopteran larvae, centipedes (chilopods), arachnids, and other insects, supplemented occasionally by small vertebrates including salamanders, small rodents, and reptiles, as well as minor amounts of plant material and seeds.^[7] This dietary composition reflects their opportunistic predation on soil-dwelling and surface invertebrates abundant in their forested habitats.^[7] Foraging in Blarina occurs predominantly through ambush predation within subterranean tunnels and leaf litter, where individuals remain stationary or move slowly to detect prey vibrations or scents before striking.^[53] They utilize ultrasonic clicks as an echolocation-like mechanism to navigate dark tunnels and locate prey, emitting pulses in the 30-60 kHz range to interpret echoes for spatial orientation and object detection.^[54] Upon capturing prey, even those larger than themselves, Blarina deliver a venomous bite via grooved lower incisors to immobilize it rapidly, facilitating handling and transport.^[55] Due to their elevated metabolic rate, Blarina individuals must consume approximately their body weight in food daily, often approaching or equaling 1-2 times body mass under normal conditions to sustain energy demands.^[56] Excess prey is frequently cached in burrows rather than consumed immediately, with studies showing that over 85% of captured items are stored for later retrieval, enhancing survival during periods of scarcity.^[57] This frequent feeding pattern is essential to support their high physiological requirements for thermoregulation and activity.^[58]

Reproduction

Blarina shrews exhibit a breeding season that typically spans from March to October, enabling females to produce 2 to 4 litters annually.^[28]^[25] Litter sizes generally range from 4 to 8 young, though extremes of 2 to 10 have been recorded across species.^[25]^[42] Gestation periods last 21 to 30 days, resulting in the birth of altricial young that are blind, hairless, and weigh approximately 1 gram.^[28]^[59] These offspring are weaned at 20 to 25 days and reach sexual maturity within 2 to 3 months, allowing many individuals to breed in their first year.^[28]^[60] Parental care is provided solely by females, who construct and maintain nests from grass and leaves, nurse the young, and aggressively defend them from predators; males play no role in rearing.^[25]^[61] In the wild, Blarina individuals typically have a lifespan of 1 to 2 years, with reproduction ceasing after this period.^[25]

Species

Diversity

The genus Blarina comprises five currently recognized species of short-tailed shrews, all endemic to North America: B. brevicauda, B. carolinensis, B. hylophaga, B. peninsulae, and B. shermani ^[1]. Taxonomic debates persist regarding the distinctiveness of certain taxa, such as the status of B. shermani relative to B. carolinensis in southern regions and B. peninsulae as a potential subspecies of B. carolinensis, with some studies proposing synonymy based on morphological and genetic overlap, though molecular and karyotypic evidence supports separation ^[2] ^[62]. The evolutionary radiation of Blarina occurred primarily during the Pleistocene epoch, when ancestral forms diverged in response to glacial cycles and the development of diverse biomes across eastern North America, including forests, grasslands, and transitional habitats ^[63]. Fossil records indicate that B. brevicauda or a close precursor served as the basal lineage, with speciation driven by isolation in refugia south of the Laurentide Ice Sheet, leading to adaptations for varied ecological niches ^[63] ^[64]. Genetic variation among Blarina species is marked by distinct karyotypes and limited interspecific hybridization, reflecting strong reproductive isolation. Most species exhibit a diploid chromosome number (2n) of 48 and a fundamental number (FN) of 48, though B. carolinensis shows variability with 2n ranging from 37 to 46 and FN of 44–45, while B. peninsulae has a distinct karyotype (2n = 46); contact zones between species reveal minimal gene flow, with hybridization rates below 5% in overlapping ranges ^[65] ^[62] ^[27].

Key species accounts

The northern short-tailed shrew (Blarina brevicauda) is the largest species in the genus, reaching weights of up to 30 g and total lengths exceeding 110 mm, with a robust build, short tail, and dense slate-gray fur.^[66] It is widespread across the northeastern United States and southern Canada, primarily inhabiting mixed and deciduous forests, as well as edges of fields and wetlands.^[48]^[67] The southern short-tailed shrew (B. carolinensis) is notably smaller than its northern counterpart, typically weighing 15–20 g and measuring 7–10 cm in total length, featuring soft, uniformly grayish-brown fur and a proportionally short, furred tail.^[59]^[5] Its range spans the southeastern United States, from Virginia southward through the Coastal Plain to eastern Texas, favoring woodlands, brushy fields, and moist deciduous areas.^[26]^[68] Elliot's short-tailed shrew (B. hylophaga), an intermediate-sized species weighing 13–17 g with total lengths of 92–121 mm, exhibits a stocky form with concealed ears and a pointed snout adapted to open habitats.^[69]^[70] It occurs across central United States prairies and grasslands, extending through the Great Plains from South Dakota to Texas and eastward to Illinois and Louisiana.^[71]^[72] The Everglades short-tailed shrew (B. peninsulae) is a medium-sized Florida endemic, similar in build to B. carolinensis but with subtle morphological distinctions such as a distinct karyotype, and it inhabits coastal marshes and wetlands of southern Florida.^[73]^[27] Its restricted range and vulnerability to habitat loss from development and sea-level rise have led to concerns for its conservation, with ongoing efforts focused on Everglades preservation.^[74]^[75] The Sherman's short-tailed shrew (B. shermani) is a medium-sized species, typically weighing 16–22 g and measuring 80–105 mm in total length, with soft grayish-brown fur and a short tail. It is endemic to peninsular Florida, from central regions southward, inhabiting dense herbaceous areas, edges of marshes and basin wetlands, mesic flatwoods, and moist mixed forests.^[76]^[77]^[2]

Ecoepidemiology

Disease reservoirs

Short-tailed shrews of the genus Blarina, particularly B. brevicauda, serve as significant reservoir hosts for several zoonotic pathogens, contributing to the maintenance and transmission of diseases in North American ecosystems.^[78] They are competent reservoirs for Borrelia burgdorferi, the causative agent of Lyme disease, with infection rates detected via xenodiagnosis reaching up to 78.6% in tested populations from endemic areas in Massachusetts during the early 1990s.^[78] Similarly, Blarina species host Babesia microti, the protozoan parasite responsible for human babesiosis, exhibiting reservoir competence levels exceeding 17% in wildlife surveys from the northeastern United States, where patent parasitemias have been observed in over 60% of sampled individuals at certain sites.^[79]^[78] These high infection prevalences underscore Blarina's role in amplifying pathogen circulation among vertebrate hosts, though their overall contribution to tick infection rates is moderated by lower infestation levels on immatures compared to rodents.^[80] Beyond Lyme disease agents, Blarina shrews harbor other tick-borne viruses, including Powassan virus (a flavivirus transmitted by Ixodes scapularis ticks), for which they demonstrate reservoir competence through direct viral detection in tissues and positive associations between shrew bloodmeals in ticks and site-level infection prevalence.^[81] Hantaviruses, such as Camp Ripley virus, have also been identified in B. brevicauda, with prevalence up to 25% in lung tissues from Minnesota populations, indicating shrews as potential reservoirs for these rodent- and soricomorph-associated pathogens despite their evolutionary divergence from classic rodent-borne strains.^[82] Transmission of these pathogens primarily occurs via questing Ixodes scapularis ticks, which acquire infections during bloodmeals on infected shrews and subsequently pass them to other hosts, including humans.^[80] Studies since the 1990s, including xenodiagnostic experiments and field surveillance, have consistently confirmed Blarina's reservoir competence for both bacterial and viral agents.^[78]^[81] Ecological traits of Blarina species enhance their role as disease reservoirs. Their high local population densities, which can fluctuate 3- to 4-fold annually in fragmented habitats, combined with fossorial burrowing behaviors, increase encounters with ground-dwelling tick vectors like I. scapularis larvae and nymphs in leaf litter and soil interfaces.^[80] This contact facilitates pathogen spillover, as shrews support a substantial proportion of larval tick feedings—up to 35% overall and 55% of those on infected ticks in northeastern study sites—thereby sustaining enzootic cycles despite their short lifespans.^[80] Ongoing research highlights how these factors position Blarina as inconspicuous yet impactful contributors to tick-borne disease dynamics in wildlife.^[80]

Interactions with humans

Short-tailed shrews of the genus Blarina, particularly B. brevicauda, occasionally interact with humans through defensive bites when handled, delivering venomous saliva that causes localized pain, swelling, and burning sensations akin to a bee sting.^[83] These effects can persist for hours to days, with symptoms including numbness, throbbing, and in rare cases, systemic reactions such as drowsiness or cramps, though no fatalities have been reported.^[83] The venom contains paralytic peptides like BPP2, which activate human T-type calcium channels (hCav3.2) involved in nociception, leading to hyperesthesia and severe pain.^[84] Such envenomations are uncommon, typically occurring during wildlife handling or accidental encounters in residential areas.^[84] In ecoepidemiological contexts, Blarina species serve as reservoirs for zoonotic pathogens, amplifying transmission risks to humans primarily through ecological overlap in urban-rural interfaces.^[85] For instance, B. brevicauda hosts Borrelia burgdorferi, the causative agent of Lyme disease, feeding approximately 55% of infected Ixodes scapularis tick larvae and contributing to over 20% of infected nymphs that quest for human hosts.^[80] This role elevates Lyme disease incidence in North American forests and suburbs, where shrews' high reservoir competence (42%) sustains tick infection rates.^[80] Blarina shrews also harbor orthohantaviruses, such as Camp Ripley virus, which has the potential to cause hantaviral disease in humans similar to hemorrhagic fever with renal syndrome via aerosolized excreta exposure, though no direct shrew-human transmission or confirmed cases have been documented.^[86] Additionally, they carry Powassan virus, a flavivirus transmitted by ticks that leads to encephalitis in humans, with shrews acting as amplifying hosts in endemic areas.^[86] A novel henipavirus, Camp Hill virus, was detected in B. brevicauda tissues in Alabama, phylogenetically related to human-pathogenic viruses like Langya henipavirus, posing potential spillover risks through contact with infected shrews or their secretions in shared habitats.^[86] No human cases of Camp Hill virus infection have been confirmed, but the shrews' proximity to human populations heightens surveillance needs for paramyxoviral emergences. As of November 2025, no human infections with Camp Hill virus or Camp Ripley virus have been reported, but surveillance continues due to proximity to human habitats.^[86] Urban adaptation by Blarina species further increases exposure opportunities, such as via agricultural activities or vector-mediated pathways.^[85]

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(PDF) Blarina carolinensis - ResearchGate
Aug 9, 2025 · ArticlePDF Available. Blarina carolinensis. June 2001; Mammalian Species. DOI:10.2307/0.673.1. Authors: Timothy S. McCay at Colgate University.
[32]
Error | Proceedings of the National Academy of Sciences
Insufficient relevant content. The provided content from https://www.pnas.org/doi/10.1073/pnas.0401383101 is a 404 error page with no information about blarina toxin BLTX or related details (source gland, molecular weight, mechanism of action, effects on prey like paralysis, blood pressure drop, hypokinesia). It contains only error messaging and unrelated data (e.g., periodic table elements and atomic weights).
[33]
Convergent Evolution of Novel Protein Function in Shrew and Lizard ...
Dec 1, 2009 · Importantly, recent studies suggest that BLTX toxicity is due to an increase in catalytic activity relative to its nontoxic homologs, thereby ...
[34]
[PDF] Habits of the Short-Tailed Shrew, Blarina Brevicauda (Say)
Apparently the sense of smell is developed to an average degree. Freshly killed mice, placed six inches from the floor of the shrew's enclosure, apparently ...
[35]
The heat increment of feeding and its thermoregulatory implications ...
The nature and potential thermoregulatory benefits of the heat increment of feeding (HIF) were investigated in short-tailed shrews (Blarina brevicauda).
[36]
Winter Survival Adaptations of the Short-Tailed Shrew (Blarina ... - jstor
Blarina conserves thermoregulatory energy by utilizing cached food reserves and avoids cold ambient temperatures by restricting foraging and nesting to ...
[37]
[PDF] the short-tailed shrew (Blarina brevicauda) and masked shrew (S
Chapter 1: A review of the biology and ecological segregation of two sympatric shrews in Ohio: the short-tailed shrew {Blarina brevicauda) and masked shrew.<|control11|><|separator|>
[38]
Blarina hylophaga (Soricomorpha: Soricidae) | Mammalian Species
May 26, 2011 · A short-legged, robust shrew with a long, pointed snout and a short tail; it is 1 of 4 species in the genus Blarina. It occurs throughout most ...
[39]
[PDF] DISTRIBUTION OF SHORT-TAILED SHREWS (MAMMALIA
(MAMMALIA: SORICIDAE: BLARINA) IN MIS-. SOURI—Three species of short-tailed shrews (genus Bla- rina) occur throughout the eastern one-half of the United.Missing: position | Show results with:position
[40]
Phylogeography of the Northern short-tailed shrew, Blarina ...
The present distribution of B. brevicauda is best explained by past fragmentation and range expansion events during and following the Pleistocene glacial cycles ...Missing: post- fossil evidence
[41]
[PDF] Systematic Revision of the Northern Short-tailed Shrew, Blarina ...
Mar 21, 2011 · Taxonomy of short-tailed shrews (genus Blarina) in. Florida. Occasional Papers of The Museum, Texas. Tech University, 251:1-19. Bole, B. P. ...
[42]
Blarina hylophaga (Elliot's short-tailed shrew) - Animal Diversity Web
Elliot's short-tailed shrews use scent for communication of reproductive and territorial information. It is likey that tactile cues are important during mating ...
[43]
https://blogs.clemson.edu/fnr/2025/11/07/the-monster-in-your-yard/
[44]
Northern Short-tailed Shrew - Montana Field Guide
Sep 12, 2024 · Farther east, within the main range of the species, Northern Short-tailed Shrews are most common in hardwood forests with deep leaf litter and ...
[45]
List of Adirondack Mammals
Short-tailed Shrew (Blarina brevicauda), Soricidae (Shrews), Northern hardwood and mixed forests to an elevation of 4300 feet. ; Hairy-tailed Mole (Parascalops ...
[46]
Numerical fluctuations in the northern short‐tailed shrew: evidence ...
Apr 19, 2002 · We studied a fluctuating population of the northern short-tailed shrew (Blarina brevicauda) in the Appalachian Plateau Province of ...
[47]
https://doi.org/10.1016/0031-9384(90)90309-R
[48]
SUNY ESF Short-tailed Shrew
Range and Habitat. The range of this abundant and widespread species includes the southern half of eastern Canada, and the eastern half of the U.S. Mixed and ...Missing: altitudinal | Show results with:altitudinal
[49]
https://doi.org/10.1893/0005-3155(2005)076%5B0009:RATAPE%5D2.0.CO;2
[50]
https://doi.org/10.1016/S0003-3472(76)80039-5
[51]
Tolerance of Conspecifics by Short-Tailed Shrews (Blarina ... - jstor
As noted by Platt (1976), times of low prey density cause a dispersal of the population, and presumably an increase in an individual's territory. It would be ...
[52]
Blarina toxin, a mammalian lethal venom from the short-tailed shrew ...
Human accounts of bites from Blarina describe a local burning sensation around the tooth puncture marks and subsequent swelling (10). In general, soricine ...
[53]
https://www.bioone.org/journals/southeastern-naturalist/volume-5/issue-2/1528-7092%282006%295%255B361%253AFOTSSS%255D2.0.CO%253B2/Food-of-the-Southern-Short-tailed-Shrew-Blarina-carolinensis-on/10.1656/1528-7092%282006%295%5B361:FOTSSS%5D2.0.CO%3B2.short
[54]
Echolocation by the Short-Tailed Shrew Blarina brevicauda
The echolocating ability of short-tailed shrews was investigated by training them to select an open tube over a closed tube through which to run.
[55]
Function of Venom in the Short-Tailed Shrew, Blarina brevicauda
Thomas E. Tomasi; Function of Venom in the Short-Tailed Shrew, Blarina brevicauda, Journal of Mammalogy, Volume 59, Issue 4, 24 November 1978, Pages 852–85.
[56]
Food Consumption and Body Weight in the Masked and Short ... - jstor
28 g animal had a lower food intake than the 7 other 19-22 g animals at both ... approaching the body weight for Blarina and 2?/2 times the body weight for.
[57]
Food Hoarding Behavior in the Short-tailed Shrew Blarina brevicauda
ABSTRACT: Short-tailed shrews Blarina brevicauda cached most (86.6%) prey cap- tured. Few were consumed immediately (9.4%) or left where killed (3.9%).Missing: diet scientific papers
[58]
METABOLISM, FOOD CAPACITY, AND FEEDING BEHAVIOR IN ...
The metabolic rates of Sorex cinereus, Sorex arcticus, Microsorex hoyi, and Blarina brevicauda were calculated from oxygen consumption, carbon dioxide ...
[59]
A species account of the Southern short-tailed shrew (Blarina ...
A species account of Southern short-tailed shrew (Blarina carolinensis) in Texas. This includes a physical description, geographic distribution, ...
[60]
Reproduction and Age Structure in a Population of Short-Tailed ...
Both sexes are capable of reproducing during their first year, and may breed 1 to 2 months after birth. This content is only available as a PDF.Missing: litter size gestation
[61]
https://animalia.bio/northern-short-tailed-shrew
[62]
(PDF) Blarina brevicauda - ResearchGate
Mar 19, 2016 · Blarina Gray, 1838 Blarina Gray, 1838: 124. Type species Corsira (Blarina) talpoides Gray (=Sorex talpoides Gapper = Sorex brevicaudus Say), ...Missing: etymology blaros
[63]
Northern Short-tailed Shrew - Maryland DNR
The Northern Short-tailed Shrew is a venomous mammal with a dark grayish body, found in the eastern US and southern Canada, and is 4.3 to 5.5 inches long.
[64]
Natural History of the Southern Short-Tailed Shrew, <i>Blarina ...
The southern short-tailed shrew, Blarina carolinensis, inhabits a broad range of ecological situations in the southeastern United States.
[65]
[PDF] Elliot's short-tailed shrew, Blarina Hylophaga
Distributional status of short-tailed shrews. (Genus Blarina) in Texas. ... The Smithsonian Book of North American Mammals,. Smithsonian Institution ...
[66]
Kansas Mammal Atlas: Elliot's Short-tailed Shrew
Jul 13, 2017 · This is the largest shrew in Kansas, and can be distinguished from other Kansas mammals by: 1) soft and silky hair that is silvery gray to black dorsally.
[67]
<i>Blarina hylophaga</i> (Sorciomorpha: Soricidae)
A short-legged, robust shrew with a long, pointed snout and a short tail; it is 1 of 4 species in the genus Blarina. It occurs throughout most of the Great ...
[68]
[PDF] Blarina hylophaga (Sorciomorpha: Soricidae)
Space use. —Blarina hylophaga is described as being a habitat generalist, occurring mostly in moist, well-drained areas and moist stream valleys (Bee et al. ...
[69]
(PDF) Natural History of the Southern Short-Tailed Shrew, Blarina ...
Mar 11, 2016 · The southern short-tailed shrew, Blarina carolinensis, inhabits a broad range of ecological situations in the southeastern United States and ...
[70]
Blarina peninsulae (Merriam, 1895) - Plazi TreatmentBank
Jul 20, 2022 · Descriptive notes. Head—body 66-76 mm, tail 18-26 mm, hindfoot 11-14 mm; weight 5-13 g. The Everglades Short- ...
[71]
ABSTRACT HESS, BENJAMIN MATTHEW. Distribution and ...
Mammalian Species 43(878): 94-103. Trani, M. K. ... brevicauda in Arkansas and notes on the distribution of Blarina carolinensis and Cryptotis ... southern part of ...
[72]
Blarina carolinensis peninsulae | NatureServe Explorer
In this database we follow Benedict et al. (2006) and treat this shrew as a subspecies of carolinensis.
[73]
Short-tailed shrews as reservoirs of the agents of Lyme disease and ...
Short-tailed shrews (Blarina brevicauda) serve as reservoir hosts for the Lyme disease spirochete (Borrelia burgdorferi) and the agent of human babesiosis ( ...
[74]
Reservoir competence of wildlife host species for Babesia microti
We found reservoir competence levels >17% in white-footed mice (Peromyscus leucopus), raccoons (Procyon lotor), short-tailed shrews (Blarina brevicauda), and ...
[75]
Conspicuous impacts of inconspicuous hosts on the Lyme disease ...
Our studies at a representative site in the centre of the northeastern Lyme disease endemic zone indicate that shrews are important B. burgdorferi ss ...
[76]
Incrimination of shrews as a reservoir for Powassan virus - Nature
Nov 22, 2021 · We conclude that shrews are a likely reservoir host for deer tick virus and that host bloodmeal analysis can provide direct evidence to incriminate reservoir ...
[77]
Hantavirus in Northern Short-tailed Shrew, United States - CDC
To our knowledge, this is the first evidence of hantaviruses harbored by shrews in the Americas. Rodents and their ectoparasites serve as reservoirs and vectors ...
[78]
[PDF] Some Effects of the Bite of the Short-Tailed Shrew, Blarina brevicauda
( I 964) stated that the toxin from the short-tailed shrew. "can cause pain for several days in humans." I experienced a severe reaction to a shrew bite which ...
[79]
https://pubmed.ncbi.nlm.nih.gov/23171673/
[80]
Diversity and transmission and zoonotic potential of microbes in true ...
Jul 21, 2025 · Meta-analyses show that insectivores host 941 unique microbes, 60% of which are viruses; these are predominantly found in shrews and hedgehogs.
[81]
Henipavirus in Northern Short-Tailed Shrew, Alabama, USA - CDC
Jan 17, 2025 · Most investigators believe the primary reservoir host for LayV to be shrews, but the virus has also been detected in goats and dogs, indicating ...