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- W77908040 abstract "River otters (Lontra canadensis) were once prevalent in the landscape of North America, but were trapped to low population numbers by the early 1900’s. Seventeen states and one Canadian province (Alberta) have successfully reintroduced river otters to their historical habitat. Biologists have carefully monitored the distribution and abundance of populations through the use of bridge surveys, public observation reports, snow-track surveys, and reports of road kill and incidentally trapped otters. Bridge surveys are the most common type of survey and are conducted at randomly generated sites once a year. This study looked at whether repeated visits would provide more data and therefore a better indicator of distribution and abundance of the river otter population in Ohio. Results showed an increase in sign presence detected on day 2 from day 1, but no increase in detection on day 3 from what was previously detected on days 1 and 2. Introduction The northern river otter (Lontra canadensis) is a native furbearer in the United States. Historically there were established populations of river otters throughout the majority of drainages in the United States and Canada before European settlement (Hall 1981). Early settlers made these otters an economically valuable commodity and trapped them solely for their fur. These settlers also had a great impact on the landscape of the United States. With an unregulated harvest of otters, decreasing water quality, increasing stream pollution, and deforestation during the late 1800’s and early 1900’s, otter populations began to decline, and in some areas were extirpated, from many North American landscapes. Otters were placed on the endangered species list in many places with a status of “protected” or even “endangered.”" @default.
- W77908040 created "2016-06-24" @default.
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- W77908040 date "2007-06-01" @default.
- W77908040 modified "2023-09-23" @default.
- W77908040 title "An Evaluation of Bridge Surveys for Monitoring River Otter Distribution in Ohio" @default.
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