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Seasonal Variation in the Food Habits of the Crayfish Orconectes Propinquus (Girard) in Trout Lake, Vilas County, Wisconsin, U.S.a. (Decapoda, Astacidea, Cambaridae)

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Die Magen der Flusskrebse Orconectes propinquus (Girard), gesammelt in unterschiedlichen Tiefen und zu verschiedenen Jahreszeiten in Trout Lake, Vilas County, Wisconsin, wurden auf ihren Nahrungsinhalt untersucht. Die Resultate sind in Prozent der Häufigkeit der vorkommenden Nahrung angegeben. Man fand Algen in den meisten Krebsmagen unabhängig von der Tiefe oder vom Datum der Untersuchung. Da in 45 bis 80% der im Herbst gefangenen Tiere Emphemeroptera-Larven, die zu dieser Jahreszeit besonders gross waren, vorkamen, kann man auf eine Bevorzügung dieser schliessen. Chironomidae Larven wurden in 10 bis 23% der in unterschiedlichen Tiefen und zu verschiedenen Jahreszeiten gesammelten Krebse gefunden. Kannibalistische Verhaltensweisen sind scheinbar auf die Häutungsperioden und die Schlüpfungszeit beschränkt gewesen.

Affiliations: 1: Biology Department, College of William and Mary, Williamsburg, Virginia 23185, U.S.A.

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/content/journals/10.1163/156854080x00445
1980-01-01
2017-04-26

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