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A Comparative Field Study of the Breeding Behaviour of a Stream and a Pond Population of Gammarus Pulex (Amphipoda)

Paul I. Ward
Oikos
Vol. 46, No. 1 (Feb., 1986), pp. 29-36
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3565376
Stable URL: http://www.jstor.org/stable/3565376
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A Comparative Field Study of the Breeding Behaviour of a Stream and a Pond Population of Gammarus Pulex (Amphipoda)
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Abstract

The breeding system of the freshwater amphipod crustacean Gammarus pulex (L.) contains a precopulatory phase during which a male carries a female. The seasonal changes in this behaviour were studied in a stream and in a pond population. The length of the guarding phase varied considerably over the seasons. In the stream, larger animals of both sexes were at an advantage in reproductive competition and the advantages were greatest at the peak of the breeding period. Animals of both sexes infected with a cystacanth of the parasite Polymorphus were less likely to be paired than were non-infected individuals. In the pond, the life cycle was more similar to that of a lake population of G. lacustris Sars than to the stream population. Pairs were more vulnerable to fish predation than were unpaired males. It is suggested that fish predation prevented all year breeding. /// Система спаривания пресноводных амфипод Gammarus pulex (L.) включала прекопулятивную фазу, в течение которой самец удерживает самку. Сезонные изменения в зтом поведении исследованы на речной и прудовой популяции. Длительность охранной фазы сопровождения сарьировала в разные сезоны. В реке крупные животные обоих полов имели преимуцества в репродуктивной конкуренции, и преимуцества были наибольшими в период пикаспаривания. Животные обоих полов, зараженные цистами паразита Polymorphus спаривались менее активно, чем незараженные. В пруду жизненный цикл более сходен с таковым у озерной популяции G. lacustris, чем у речной. Спариваюциеся особи были более подвержены хицничеству рыб, чем неспариваюциеся самцы. Установлено, что хицничество рыб препятствует размножению в течение всего года.

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