Mating system of the lefteye flounder,Engyprosopon grandisquama |
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Authors: | Hisaya Manabe Miyuki Ide Akihiko Shinomiya |
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Institution: | (1) Laboratory of Aquatic Resource Science, Faculty of Fisheries, Kagoshima University, 4-50-20 Shimoarata, 890-0056 Kagoshima, Japan;(2) Present address: Fisheries Promotion Division, Forestry and Fisheries Department of Kagoshima Prefecture, 10-1 Kamoike-shinmachi, 890-8577 Kagoshima, Japan |
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Abstract: | Underwater observations were conducted on the reproductive behavior and mating system of the lefteye flounder,Engyprosopon grandisquama, off Nagashima, southwest of Kyushu Island, Japan. Two types of males were found: large males, which defended territories
against other large males, and small males, which did likewise but only against smaller males. Large males established territories
which encompassed or ovelapped the home ranges of 1 or 2 cohabitant females. Territories of the small males, in which a smaller
female often maintained a home range, overlapped those of large males. Pair spawning occurred around sunset. Mating of large
males with cohabitant females was observed 36 times and that of a small male with a smaller female once. Pair formation was
assorted by body size, paired males being larger than females in most cases. Thus, inE. grandisquama, gigamous large males were common, small males occurring within the former's erritorial boundaries mating with smaller females. |
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Keywords: | Bothidae mating system territoriality spawning bigamy |
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