River Otters. Lutra canadensis species Mustelidae family Other members. Life span. Weasels, Sea-otters, Minks, and Badgers
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3 River Otters Lutra canadensis species Mustelidae family Other members Weasels, Sea-otters, Minks, and Badgers Life span 15 years (wild) 25 years (captivity) Nopnatureimages.com
4 Physical Attributes Fur Light to dark brown Height 40 inches long and 10 inches in shoulder height Weigh Size 10 to 25 pounds in weigh Females are smaller than males Grandfather.com
5 Physical Attributes (continued) Sensitive whiskers Scent gland Delayed implantation Sharp teeth Web feet
6 Habitats Lake edges Rock piles Steep slopes Beaver dens Isolated areas Wilder territory Clean water
7 Diet Main prey items Fish (winter) Crayfish (summer) Secondary prey items Invertebrates Small mammals Nopnatureimages.com
8 Ectothermic (cold-blooded) Occurs when body temperature changes due to outside temperature Summer Warmer and faster Winter Colder and slower science.nasa.gov
9 Population Declines Nearly extinct in PA Average population of 375 Researched in 1978 Confined to Northeast Pollution of water Trapping for fur Outlawed in
10 Reintroduction 22 otters in Pine Creek (North Central PA) May 1983 July 1984
11 Gamefish Fish that: Are hunted for fun Have desirable taste Have regulations for capture
12 Fishermen Opinion Reintroduction caused worry River otters lived in rivers River otters preyed on fish Gamefish population decreased in river
13 Ohiopyle State Park Large portion of study site Fish Present Bass Yellow perch Bluegill Stocked trout Rainbow Brown Cometohohiopyle.com
14 The Youghiogheny River Data collected from this 11 mile stretch Ohiopyle State Park to Confluence, PA
15 Gamefish in our Study Trout (Salmonidae) family Only gamefish stocked Any Salomindae scale found in scat is either brown and rainbow trout
16 Stocking Schedule April 5- June 29 February Rainbow and brown trout Usbr.gov
17 Stocking Season Rationale Stocked continuously each month multiple times Recorded by Pennsylvania Fish and Boat Committee through 2008 Found record that river was stocked 2001
18 Purpose See if there is a difference in trout consumed during stocking season versus non-stocking season local.brookings.k12.sd.us
19 Hypotheses Null: The river otters will eat the same amount of trout in the stocking season and non-stocking season. Alternate: The river otters will eat more stocked trout in the stocking season then the nonstocking season.
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21 Time of Collection April-November 2000 January-June 2001
22 Sampling Population of otters along the Youghiogheny River 54 total samples 27 from stocking season 27 from non-stocking season
23 Procedures Collected the scat (Dr. Serfass) Put the scat in a glass beaker with three drops of soap Filled beaker half full with hot water
24 Procedures (continued) Placed under hood overnight Strained and rinsed Repeated process
25 Procedures (continued) Dried for three nights on paper towels Examined the scat
26 Analyzing the Scat Dissecting microscope Presence/Absence chart Fish identification chart Made by Christina Fairbanks (2011)
27 Fish Identification Data Chart
28 Fish Identification Families Salmonidae (Trout) Centrarchidae (Sunfish) Cyprinadae (Minnow) Percidae (Perch) Catosomidae (Sucker) Crayfish fishandboat.com
29 Confidence Intervals Used 95% intervals 95% of the time data will fall between the bars Microsoft Excel calculated the percentages
30 Prey Present Percentages Presence/Absence Sample # Salmonidae (trout family Catostomidae ) (suckerfish) Cyprinidae( minnow) Percideae (Perch) Cantrarchidae(s unfish) Crayfish Season CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked CO stocked
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32 Percentages of Fish Scales in Scat Table 1.-The percentage of fish scales found in stocked and non-stocked samples SALMONIDAE CATOSTOMIDAE CYPRINIDAE PERCIDAE CENTRARCHIDAE CRAYFISH TOTAL SAMPLES STOCKED UNSTOCKED % STOCKED 11.11% 3.70% 0.00% 11.11% 18.52% 96.30% % UNSTOCKED 11.11% 0.00% 3.70% 18.52% 14.81% 96.30%
33 Overlapping Confidence Intervals No difference Possible range in data
34 Consumpttion by Percentage Comparison of Prey Items of River Otters Between Stocking and Non-Stocking Season 100% 80% 60% % Stocked 40% % Unstocked 20% 0% Prey Families
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36 Conclusions Accept null hypothesis Reject alternate hypothesis No difference 95% intervals overlap Same amount of stocked trout
37 Limitations Collect more data Could be clearer Could be more accurate Use fresh scat May include more intact scales May show more current trends
38 Suggestions for Future Studies Dry our own scat Can have fresh scales/bones to examine Can have more accurate data Use different rivers May affect results or data May change stocking schedules May stock different fish
39 Suggestions for Future Studies (continued) Identify crayfish Different Species Species preference Mjseafood.com
40 References Cited Bruner, R. (2012, June). Welcome to Confluence, PA. Retrieved from Cote, C., H.M.J. Stewart, R.S. Gregory, J. Gosse, J.J. Reynolds, G.B. Stenson, and E.H. Miller. (2008). Prey Selection by Marine-Coastal River Otters (Lontra canadensis) in Newfoundland, Canada. Journal of Mammalogy, 89(4), Fergus, C. River Otter. (n.d). Retrieved from National Audubon Society. Site Profile: Youghiogheny Valley, Ohiopyle State Park. (2012). Retrieved from Ohiopyle State Park. (n.d.). Retrieved from Serfass, T.L. and L.M. Rymon. (1985). Success of river otters introduced in Pine Creek drainage in North-central Pennsylvania. Transactions of the Northeast Section of the Wildlife Society, 41, Serfass, T.L., L.M. Rymon and R.P. Brooks. (1990). Feeding Relationships of River Otters in Northeastern Pennsylvania. Transactions of the Northeast Section of the Wildlife Society,47, Stearns, C.R. and T.L. Serfass. (2011). Food Habits and Fish Prey Size Selection of a Newly Colonizing Population of River Otters (Lontra canadensis) in Eastern North Dakota. The American Midland Naturalist, 165, Youghiogheny Scenic & Wild River. (n.d.) Retrieved from
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