American Pygmy Shrew, &lt;em&gt;Sorex hoyi&lt;/em&gt;, Consumed by an Arctic Grayling, &lt;em&gt;Thymallus arcticus&lt;/em&gt;

Jung, Thomas S.; Milani, Angela; Barker, Oliver E.; Millar, N.

doi:10.22621/cfn.v125i3.1230

Cited by 4 publications

(1 citation statement)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similarly, non-aquatic shrews, such as ambulatory Sorex araneus, S. cinereus, S. fumeus, and S. minutus, have been documented to be capable swimmers (Dagg and Windsor 1972;Hanski 1986). Based on the diversity of species and numbers of individuals that have been found in the digestive tracts of various freshwater fishes (e. g., Huish and Hoffmeister 1947;Hodgson 1986;Moore and Kenagy 2004;Jung et al 2011;Lisi et al 2013), a number of additional ambulatory and semi-fossorial species readily take to water.…”

Section: Discussionmentioning

confidence: 99%

Skeletal indicators of locomotor adaptations in shrews

Woodman

2023

Therya

View full text Add to dashboard Cite

The Soricidae (Mammalia: Eulypotyphla) comprises more than 450 species inhabiting a variety of habitats on five continents. As a family, shrews employ a variety of locomotor modes that incorporate ambulatory, fossorial, aquatic, and scansorial behaviors, illustrating an ability to exploit a variety of natural substrates and their associated resources. In this study, the association of skeletal morphology and three of the dominant locomotor modes in the family—ambulatory, semi-fossorial, and semi-aquatic behaviors—was investigated in up to 52 species of 12 genera representing all three subfamilies of Soricidae. From skeletal measures, 34 morphological indices were calculated, most of which have been used previously to characterize substrate use among shrews, rodents, and other mammals, and analyzed for their individual effectiveness for discriminating the three locomotory modes. To assess their effectiveness in combination, subsets of locomotor indices were analyzed using 1) mean percentile ranks, 2) the first principal component from principal components analysis, and 3) plots and classifications from discriminant function analyses. In general, the three methods effectively identified and grouped the three locomotor modes and identified smaller subsets. Additional analyses were then used to classify the locomotor behaviors of five species whose locomotor modes were unknown or ambiguous. The analyses reinforce and broaden the scope of a previously identified observation of the wide range of grades of morphological variation that may permit an equally diverse range of locomotor abilities among the Soricidae.

show abstract

Section: Discussionmentioning

confidence: 99%

Skeletal indicators of locomotor adaptations in shrews

Woodman

2023

Therya

View full text Add to dashboard Cite

show abstract

Introduced fish reduce the occurrence of shrews in alpine lakes

Bello,

Albó,

Aymerich

et al. 2024

Biological Conservation

View full text Add to dashboard Cite

Episodic predation of mammals by stream fishes in a boreal river basin

Lisi

Bentley

Armstrong

et al. 2013

Ecology of Freshwater Fish

View full text Add to dashboard Cite

Stream‐dwelling fish typically feed on small prey items, such as benthic invertebrates, but maintain the capacity to opportunistically feed on rare, large‐bodied prey when available. However, consumption of particularly large prey is typically viewed as isolated events that are not organised spatially or temporally across watersheds. We assessed the occurrence of small mammals in the stomach contents of rainbow trout (Oncorhynchus mykiss) and Arctic grayling (Thymallus arcticus) over 13 years in the Wood River basin, Alaska (59°34′N, 158°48′W). Shrews (Sorex spp.) were the dominant mammals observed episodically every 2–3 years in the stomach contents of fish. Notably, shrew consumption was correlated in both Arctic grayling and rainbow trout within individual streams, and across the river basin in several subwatersheds. Predators of shrews were usually the largest individuals within each population, suggesting that smaller fish are gape‐limited and that dominant fish monopolised mammal prey. On average, 24% (11–38%) of Arctic grayling >298 mm (fork length) and rainbow trout >290 mm contained mammal prey during peak years. Small mammal populations often cycle every 2–5 years with well‐known functional and numerical effects for terrestrial predators, a dynamic that may be reflected in our 13 years data set of diet contents for aquatic predators. Although numerically infrequent when averaged over time, small mammal subsidies to streams may be episodically important to the energy budgets of long‐lived consumers in freshwater environments.

show abstract

American Pygmy Shrew, <em>Sorex hoyi</em>, Consumed by an Arctic Grayling, <em>Thymallus arcticus</em>

Cited by 4 publications

References 6 publications

Skeletal indicators of locomotor adaptations in shrews

Skeletal indicators of locomotor adaptations in shrews

Introduced fish reduce the occurrence of shrews in alpine lakes

Episodic predation of mammals by stream fishes in a boreal river basin

Contact Info

Product

Resources

About