scholarly journals Causes of Mortality in a Population of Marine-Foraging River Otters (Lontra canadensis)

2020 ◽  
Vol 56 (4) ◽  
Author(s):  
Joseph K. Gaydos ◽  
Martha A. Delaney ◽  
Stephen Raverty
Keyword(s):  
Lontra Canadensis ◽  
River Otters ◽  
Causes Of Mortality

Spacing, movements, and habitat selection of the river otter in boreal Alberta

1994 ◽  
Vol 72 (7) ◽  
pp. 1314-1324 ◽  
Author(s):  
D. G. Reid ◽  
T. E. Code ◽  
A. C. H. Reid ◽  
S. M. Herrero
Keyword(s):  
Lontra Canadensis ◽  
Home Ranges ◽  
Adult Males ◽  
Movement Rates ◽  
River Otters ◽  
Aquatic Mammal ◽  
Adult Females ◽  
Two Factors ◽  
Bog Lakes ◽  
Selection Of

Seasonal spacing patterns, home ranges, and movements of river otters (Lontra canadensis) were studied in boreal Alberta by means of radiotelemetry. Adult males occupied significantly larger annual home ranges than adult females. Males' ranges overlapped those of females and also each other's. In winter, home ranges of males shrank and showed less overlap. Otters often associated in groups, the core members typically being adult females with young, or adult males. Otters tended to be more solitary in winter. In winter, movement rates of all sex and age classes were similar, and much reduced for males compared with those in other seasons. These data indicated a strong limiting effect of winter ice on behaviour and dispersion. We tested the hypothesis that otters select water bodies in winter on the basis of the suitability of shoreline substrate and morphology for dens with access both to air and to water under ice. Intensity of selection was greatest in winter, with avoidance of gradually sloping shorelines of sand or gravel. Adults selected bog lakes with banked shores containing semi-aquatic mammal burrows, and lakes with beaver lodges. Subadults selected beaver-impounded streams. Apart from human harvest, winter habitats and food availability in such habitats are likely the two factors most strongly limiting otter density in boreal Alberta.

Development of polymorphic microsatellite loci for North American river otters (Lontra canadensis) and amplification in related Mustelids

2003 ◽  
Vol 4 (1) ◽  
pp. 56-58 ◽  
Author(s):  
Amanda S. Beheler ◽  
Jennifer A. Fike ◽  
Lisa M. Murfitt ◽  
Olin E. Rhodes ◽  
Thomas S. Serfass
Keyword(s):  
North American ◽  
Microsatellite Loci ◽  
Lontra Canadensis ◽  
River Otters ◽  
American River ◽  
Polymorphic Microsatellite

scholarly journals A River Otter's, Lontra canadensis, Capture of a Double-crested Cormorant, Phalacrocorax auritus, in British Columbia's Gulf Island Waters

2007 ◽  
Vol 121 (3) ◽  
pp. 325
Author(s):  
Michael H. H. Price ◽  
Clare E. Aries
Keyword(s):  
Lontra Canadensis ◽  
Phalacrocorax Auritus ◽  
River Otter ◽  
Freshwater Lakes ◽  
Marine Bird ◽  
River Otters

Direct and apparent predation events by River Otters (Lontra canadensis) on birds have been recorded on marine islands and freshwater lakes. We add to this the first known observation of a River Otter capturing a marine bird on the ocean.

scholarly journals Fatty acid analysis as a tool to infer the diet in Illinois river otters (Lontra canadensis)

2014 ◽  
Vol 56 (1) ◽  
pp. 16 ◽  
Author(s):  
Damian Satterthwaite-Phillips ◽  
Jan Novakofski ◽  
Nohra Mateus-Pinilla
Keyword(s):  
Fatty Acid ◽  
Fatty Acid Analysis ◽  
Lontra Canadensis ◽  
Illinois River ◽  
River Otters

scholarly journals River Otter, Lontra canadensis, Food Habits in the Missouri Ozarks

2008 ◽  
Vol 122 (4) ◽  
pp. 303 ◽  
Author(s):  
Nathan M. Roberts ◽  
Charles F. Rabeni ◽  
John S. Stanovick ◽  
David A. Hamilton
Keyword(s):  
Smallmouth Bass ◽  
Lontra Canadensis ◽  
Micropterus Dolomieu ◽  
Widespread Occurrence ◽  
River Otters ◽  
Lepomis Megalotis ◽  
Rock Bass ◽  
Longear Sunfish ◽  
The Mean ◽  
Ambloplites Rupestris

The reintroduction of River Otters (Lontra canadensis) between 1982 and 1992 resulted in widespread occurrence of the species throughout the Missouri Ozarks. This study examined otter diets from the vicinity of two Ozark streams in relation to seasonal and spatial trends. Otter scats (N = 4750) were collected and analyzed from the Osage Fork River and Big Piney River during the summer and winter seasons of 2001 and 2002. During the winter (January-March), fish occurred in 86% of the samples. During the summer (June–August), occurrence of fish dropped to approximately 15% for both rivers. Seven families of fish were identified in the diets, with Centrarchidae being most common regardless of river or season. Within the Centrarchidae, the genus Lepomis (mostly Longear Sunfish, Lepomis megalotis) was most common, with Micropterus (mostly Smallmouth Bass, Micropterus dolomieu) and Rock Bass (Ambloplites rupestris) also well represented. The mean age of Ambloplites consumed (mean = 3.3 years) was consistently older than that of either Micropterus (mean = 2.54 years) or Lepomis (mean = 2.78 years). Crayfish were recovered from a mean of 85.2% of scats in the winter and 99% in the summer. Smaller fish and crayfish were more common from the upper reaches of the streams while larger fish were prevalent in the lower reaches.

scholarly journals River Otter Distribution and Food Habits in Grand Teton National Park as Part of an Ongoing Project in the GYE

2015 ◽  
Vol 38 ◽  
pp. 75-78
Author(s):  
Kelly Pearce ◽  
Tom Serfass
Keyword(s):  
National Park ◽  
Activity Patterns ◽  
Public Support ◽  
Primary Objective ◽  
Camera Traps ◽  
Lontra Canadensis ◽  
Flagship Species ◽  
River Otter ◽  
Grand Teton National Park ◽  
River Otters

Grand Teton National Park is part of the known range of the North American river otter, however not much is known about this semi-aquatic mammal within the park. The results presented here are part of a larger project to investigate the potential of the river otter (Lontra canadensis) to serve as an aquatic flagship (species that engender public support and action) for the Greater Yellowstone Ecosystem. River otters, known for their charismatic behavior have the potential to serve as an aquatic flagship species to promote conservation of aquatic ecosystems. The primary objective of this portion of the study was to identify river otter latrines on portions of the Snake River, between Flagg Ranch and Jackson Lake, and between Jackson Lake Dam and Pacific Creek, collect river otter scats to determine diet of the river otter, and employ remote cameras to determine activity patterns of the river otters. Between 20 June and 1 July 2015, 26 river otter latrines were identified during shoreline surveys, 186 river otter scats were collected, and cameras were deployed at 6 latrines between 7 July and 24 August 2015. River otter scats have been cleaned and prepared for analysis, but have not all been processed to date. Camera traps recorded 222 images, of which 7% (n = 14) were of carnivores, 70% (n = 155) were of non-carnivore mammals, and 9% (n = 22) were of birds. River otters were detected at 1 of the 6 latrines, a total of 5 independent times during the study.

Variation in digestive efficiency of captive North American river otters (Lontra canadensis) on various diets

Zoo Biology ◽  
2007 ◽  
Vol 26 (1) ◽  
pp. 41-50 ◽  
Author(s):  
Steffany C. White ◽  
David W. Clark ◽  
Carrie D. Day ◽  
Robert S. Sikes
Keyword(s):  
North American ◽  
Lontra Canadensis ◽  
Digestive Efficiency ◽  
River Otters ◽  
American River

Summer Diet Characteristics of North American River Otters (Lontra canadensis) in Central Illinois

2015 ◽  
Vol 173 (2) ◽  
pp. 294-304 ◽  
Author(s):  
Gregory R. Fretueg ◽  
Terrance J. Martin ◽  
Chris Widga ◽  
Dennis R. Ruez
Keyword(s):  
North American ◽  
Lontra Canadensis ◽  
River Otters ◽  
American River ◽  
Central Illinois

Habitat selection by river otters (Lontra canadensis) under contrasting land-use regimes

2009 ◽  
Vol 87 (5) ◽  
pp. 422-432 ◽  
Author(s):  
D. Gallant ◽  
L. Vasseur ◽  
M. Dumond ◽  
E. Tremblay ◽  
C. H. Bérubé
Keyword(s):  
Land Use ◽  
Habitat Use ◽  
Regional Scale ◽  
Anthropogenic Disturbances ◽  
Lontra Canadensis ◽  
Anthropogenic Factors ◽  
Theoretic Approach ◽  
Related Factors ◽  
River Otters ◽  
Sign Distribution

Habitat preferences of river otters ( Lontra canadensis (Schreber, 1777)) are well known, but because most studies were conducted in regions with markedly low or high levels of anthropogenic disturbances, it is not well known how their habitat usage is affected by varied anthropogenic disturbances and land-use regimes on a regional scale. We studied habitat use by otters in eastern New Brunswick, Canada, in an area having both protected and disturbed riparian habitats. Using long-range winter riparian transects, we documented activity-sign distribution along riverbanks in relation to 12 habitat factors and 9 categories of anthropogenic disturbances. We documented variables at site with activity signs and at habitat stations along riverbanks at 500 m intervals. We used logistical regressions and Akaike’s information criterion in an information–theoretic approach to compare models and determine the important factors involved. Habitat-related factors were more important than anthropogenic ones in describing habitat use. The best performing models were those incorporating both habitat and anthropogenic factors. Beaver ( Castor canadensis Kuhl, 1820) ponds were the most important habitat factor, while fields were the most important anthropogenic factor. Our results indicate that otters responded mostly to the presence of habitat features they use and secondarily to the presence of anthropogenic structures or activities in an area.

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