Status and Population Characteristics of the Northern River Otter (Lontra Canadensis) in Central and Eastern Oklahoma PDF Download
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Author: Dominic Alan Barrett
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Dominic Alan Barrett
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Oklahoma. Department of Wildlife Conservation
Publisher:
ISBN:
Category : North American river otter
Languages : en
Pages : 228
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Author: Dominic Alan Barrett
Publisher:
ISBN:
Category : Lontra
Languages : en
Pages : 13
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Book Description
In 1984 and 1985, the Oklahoma Department of Wildlife Conservation reintroduced North American river otters (Lontra canadensis) from coastal Louisiana into eastern Oklahoma. Those reintroductions and immigration from Arkansas and possibly northeastern Texas allowed river otters to become reestablished in eastern Oklahoma. Our goals were to determine the contemporary distribution of river otters in central and eastern Oklahoma with voucher specimens, sign surveys, and mail surveys and to compare proportion of positive detections among watersheds. We report new distributional records with voucher specimens from seven counties (Adair, Bryan, Coal, Johnston, McIntosh, Okfuskee, Tulsa) in Oklahoma. We also provide locality information for specimens collected from four counties (Haskell, McCurtain, Muskogee, Wagoner) where river otters were described in published literature but no voucher specimens existed. During winter and spring 2006 and 2007, we visited 340 bridge sites in 28 watersheds in eastern and central Oklahoma and identified river otter signs in 16 counties where river otters were not previously documented in published literature or by voucher specimens. Proportion of positive sites within each watershed ranged 0-100%. Mail surveys suggested that river otters occurred in eight additional counties where they were not previously documented by published literature, voucher specimens, or sign-survey efforts.
Author:
Publisher:
ISBN:
Category : Lutra canadensis
Languages : en
Pages : 142
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Author: Sara A. Adamczak
Publisher:
ISBN:
Category : North American river otter
Languages : en
Pages : 76
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The North American river otter (Lontra canadensis) is a semi-aquatic, apex predator that has undergone vast changes in its distribution in the past few decades. In the Midwest, river otters were extirpated and later reintroduced with little follow up on their population status. It is important to assess the current population in order to make the proper management decisions statewide. In addition to the lack of demographic knowledge, spatio-temporal variation in the North American river otter (Lontra canadensis) diet is not well understood. As resource availability and usage can influence population demographics, it is important to assess river otter diet to properly understand river otter ecology. In order to assess the river otter population in Ohio, the Ohio Department of Natural Resources (ODNR) requested carcass submission by licensed trappers. Throughout the 2016-2017 and 2017-2018 trapping seasons, 107 river otter carcasses were collected. Necropsies were performed to assess age and sex, reproductive status, and stable-isotope informed diet composition. Reproductive rates were determined from counting corpora lutea in female river otters. Demographic data were compared to the 2005-2008 harvests seasons, when river otter trapping was first reinstated. Samples of river otter muscle were collected, prepared and assessed for stable isotopes of 13C and 15N to estimate the variability in the dietary contribution of multiple prey sources by age, sex, and location.
Author: Kevin Ross Kimber
Publisher:
ISBN:
Category :
Languages : en
Pages : 554
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Author: Samantha Wilber
Publisher:
ISBN:
Category : Ecology
Languages : en
Pages :
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North American river otters are considered common in the state of Florida, but their populations have not been studied since the 1980's. Since that time, Florida's human population has more than doubled, and many natural areas of Florida have been developed. The aim of this study was to determine the presence or absence of river otters at locations in Florida which they historically inhabited. Forty-six sample sites where otters were historically found were obtained from the Florida Museum of Natural History Mammals Master Database (FMNH MMD). These sites were condensed to two focus areas, in and around Alachua and Collier Counties, where the sites were most highly clustered. Each site was surveyed to determine the presence or absence of river otters and to determine the suitability of the site's environment for otter habitation. Sites with favorable habitat features for otters were surveyed a second time. River otters were not found at any site. Only 9 of the 46 sites had permanent water and only 8 of those had other habitat features preferred by otters. Therefore, only 17.39% of sites that historically supported otters likely still have the ability to do so. Loss of water over time is most likely the result of human disturbances such as the draining, damming, and canalizing of wetlands. As a result of this loss of natural habitat, river otters have become increasingly common in urban areas wither preferred habitat features, even if they are man-made. The increased presence near humans may have led to the apparently inaccurate assumption that otters are common, and, therefore, do not need protection.
Author: Dr. Richard A. NeSmith
Publisher: Applied Principles of Education & Learning
ISBN:
Category : Juvenile Nonfiction
Languages : en
Pages : 34
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Book Description
Do you ever wonder about the life of otters? Do you know where they sleep? Do you want to learn about their social behaviors, diet, or how they swim through the water so gracefully? Anything and everything you ever wondered about these curious creatures can be found in this easy to read, informative book. The wonderful pictures included in this book have captured some of the many reasons people are drawn to these adorable animals over the years. I have personally worked with many different animals, and I can honestly say that otters are genuinely one of the most interesting of the animal kingdom. Once you read this book, you will understand why I, as well as many others, have a fascination with otters. Laurie Aleixo, DVM, Fort Pierce, Florida
Author: Barbara Juster Esbensen
Publisher: U of Minnesota Press
ISBN: 1452933243
Category : Nature
Languages : en
Pages : 34
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Book Description
Explores the world of the North American river otter, describing the playful mammal's behavior and characteristics.
Author: Deborah Dorothy Boege-Tobin
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 139
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I studied the spacing patterns and habitat utilization by reintroduced northern river otters, Lontra canadensis, at two sites in Missouri because previous studies of otters indicate, plasticity of a species social structure will likely be due to the tactics employed in acquiring resources in any given area. Seven hypotheses were tested by employing radio-tracking, habitat assessment and geographic information system approaches: (1) home range (HR) and core area (CA) size differ by sex; (2) HR and CA size differ in breeding vs. non-breeding seasons; (3) percent range overlap differs by sex; (4) habitat utilization, as indicated by latrine use, differs seasonally; (5) primary prey type(s) found in scat differ seasonally; (6) environmental characteristics of areas used extensively by otters (latrines, dens, haul-outs) differ from adjacent, unused sites; and (7) stream-order effects and features associated with core area use are similar between two disjointed field sites, and can thus be used along with GIS-driven identifiers to generate predictions regarding suitable habitat for Midwestern river otter populations. Evidence is presented on differences in ranging patterns of otters by location, sex, and seasonality, as well as differences in core area use and accompanying habitat characteristics for the two populations. The following hypotheses were corroborated: (1) male otters had larger HRs and CAs than female otters; (2) female otters maintained small, non-overlapping home ranges; (3) males exhibit a greater percentage of inter- and intra-sexual HR and CA overlap than females; and (4) HR and CA size, and percent overlap differ between a large, riverine ecosystem and a small, meandering stream ecosystem. However, hypotheses examining temporal use of space by otters were not supported. In conclusion, this study suggested that northern river otters exhibit a variety of spacing patterns in different parts of their range, similar to those discovered in other solitary carnivores. Seasonal use of space was different from that typically found in solitary carnivores; differences may be related to habitat characteristics associated with stream order and wetland ecosystems. Overall, although introduced otters came from disjointed regions differing in habitat features and ecological pressures, reintroduced otters have done very well in Missouri.
