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Coexistence and Life Cycle Characteristics of Five Species of the Amphipod Genus Gammarus

Steen Kolding and Tom M. Fenchel
Oikos
Vol. 33, No. 2 (1979), pp. 323-327
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3544009
Stable URL: http://www.jstor.org/stable/3544009
Page Count: 5
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Coexistence and Life Cycle Characteristics of Five Species of the Amphipod Genus Gammarus
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Abstract

The life cycle characteristics of five amphipod species of the genus Gammarus: G. oceanicus, G. locusta, G. salinus, G. zaddachi, and G. duebeni from a Danish brackish water area are given, and discussed in relation to coexistence between the species. The five species are distributed according to salinity and with more or less narrow zones of overlap. The species that do overlap in distribution always have diametrically different life cycles so that the three winter breeding forms (G. duebeni, G. salinus, and G. oceanicus) are separated by the two summer breeding forms (G. zaddachi, G. locusta). These findings are discussed in terms of size differences between coexisting species populations and interspecific precopulation. /// Представлены описания жизненных циклов 5 видов амфипод рода Gammarus: Gammarus oceanicus, Gammarus locusta, Gammarus salinus, Gammarus zaddochi и Gammarus duebeni в солоноватых водах территории Дании, обсуждаются вопросы сосуществования видов. 5 видов распределяются в зависимости от солености воды с более или менее узкими зонами перекрывания. Виды с перекрывающимися местоовитаниями, обычно имеют диаметрально противоположный жизненный цикл, так что 3 формы, размножающиеся зимой, (G. duebeni, G. salinus, G. oceanicus) отличаются от 2-х форм с летними циклами (G. zaddachi, G. locusta). Эти данные обосуждаются с точки зрения различий величины популяций сосуществующих видов и внутривидовой прекопуляции.

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