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Diurnal activity in a group of Gulf of Maine decapods

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[The patterns of diel activity of four large decapod species in the shallow subtidal of the Isles of Shoals, Gulf of Maine, U. S. A. were investigated. During the summer of 1999 the diel abundance and size distribution of active decapod individuals were surveyed at three depth ranges at a sheltered site on Appledore Island. Densities of active American lobsters, Homarus americanus H. Milne Edwards, 1837, were, as expected, highest at night. The crabs Cancer borealis Stimpson, 1859 and Carcinus maenas (L., 1758), however, were almost exclusively active during the day. Cancer irroratus Say, 1817 were equally active during the day and the night, but the mean size of individuals was significantly larger during the day. Surveys at additional sites in 2003 confirmed that these same patterns of diel activity were present throughout the Isles of Shoals. An extensive review of the literature suggests that such diurnal activity is not only unusual for the three crab species of this study, but for the whole genus Cancer as well. Untersucht wurden die Muster der Tag-Nacht-Aktivität vierer großer Dekapoden-Arten aus dem Flachwasser der Isles of Shoals im Golf von Maine, U. S. A. Auf der geschützten westlichen Seite der Insel Appledore sind im Sommer 1999 Individuenzahl und Größenverteilung aktiver Dekapoden in drei Tiefenbereichen ermittelt worden. Der Amerikanische Hummer Homarus americanus H. Milne Edwards, 1837 erwies sich erwartungsgemäß als nachtaktiv, während die beiden Krabben Cancer borealis Stimpson, 1859 und Carcinus maenas (L., 1758) fast ausschließlich tagaktiv waren. Cancer irroratus Say, 1817 war tags genauso aktiv wie nachts, bloß war die durchschnittliche Körpergröße der Individuen am Tage signifikant größer. Stichproben im Bereich dreier weiterer Inseln im Jahr 2003 zeigten, dass diese Arten im Gesamtbereich der Isles of Shoals dieselben Muster der TagNacht-Aktivität aufweisen. Eine umfassende Literaturrecherche ergab, dass die hier festgestellte Tag-Nacht-Aktivität nicht nur für die drei untersuchten Krabben höchst ungewöhnlich ist, sondern auch für alle Arten der Gattung Cancer insgesamt., The patterns of diel activity of four large decapod species in the shallow subtidal of the Isles of Shoals, Gulf of Maine, U. S. A. were investigated. During the summer of 1999 the diel abundance and size distribution of active decapod individuals were surveyed at three depth ranges at a sheltered site on Appledore Island. Densities of active American lobsters, Homarus americanus H. Milne Edwards, 1837, were, as expected, highest at night. The crabs Cancer borealis Stimpson, 1859 and Carcinus maenas (L., 1758), however, were almost exclusively active during the day. Cancer irroratus Say, 1817 were equally active during the day and the night, but the mean size of individuals was significantly larger during the day. Surveys at additional sites in 2003 confirmed that these same patterns of diel activity were present throughout the Isles of Shoals. An extensive review of the literature suggests that such diurnal activity is not only unusual for the three crab species of this study, but for the whole genus Cancer as well. Untersucht wurden die Muster der Tag-Nacht-Aktivität vierer großer Dekapoden-Arten aus dem Flachwasser der Isles of Shoals im Golf von Maine, U. S. A. Auf der geschützten westlichen Seite der Insel Appledore sind im Sommer 1999 Individuenzahl und Größenverteilung aktiver Dekapoden in drei Tiefenbereichen ermittelt worden. Der Amerikanische Hummer Homarus americanus H. Milne Edwards, 1837 erwies sich erwartungsgemäß als nachtaktiv, während die beiden Krabben Cancer borealis Stimpson, 1859 und Carcinus maenas (L., 1758) fast ausschließlich tagaktiv waren. Cancer irroratus Say, 1817 war tags genauso aktiv wie nachts, bloß war die durchschnittliche Körpergröße der Individuen am Tage signifikant größer. Stichproben im Bereich dreier weiterer Inseln im Jahr 2003 zeigten, dass diese Arten im Gesamtbereich der Isles of Shoals dieselben Muster der TagNacht-Aktivität aufweisen. Eine umfassende Literaturrecherche ergab, dass die hier festgestellte Tag-Nacht-Aktivität nicht nur für die drei untersuchten Krabben höchst ungewöhnlich ist, sondern auch für alle Arten der Gattung Cancer insgesamt.]

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/content/journals/10.1163/1568540041717975
2004-05-01
2016-09-25

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