Predation on zebra mussels (Dreissena polymorpha) by captive-reared map turtles (Graptemys geographica)

摘要: The suitability of the Eurasian zebra mussel, Dreissena polymorpha, as prey for common map turtle, Graptemys geographica, was tested under laboratory conditions. turtles, which were reared in captivity without contact with molluscs, readily consumed mussels every feeding trial. Mussels ingested whole. Repeated exposure to successive trials did not increase consumption rates (ca. 11 mussels/turtle per day), suggesting that turtles required little time recognize and efficiently utilize prey. offered ranging from 4 34 mm length large 32 mm, but larger than 25 mm at lower rates. Turtles numbers presence an alternative prey, prosobranch snail Bithynia tentaculata, is turtle habitats Great Lakes – St. Lawrence River system. Populations are sympatric uppe...