The Effects of Size on the Mating Decisions of Gammarus pulex (Crustacea, Amphipoda)

Wiley - Tập 64 Số 2 - Trang 174-184 - 1984
Paul I. Ward1
1Department of Zoology, University of Liverpool,

Tóm tắt

Abstract and Summary

The breeding system of the freshwater amphipod, Gammarus pulex, has a precopulatory female guarding phase by which a male ensures his presence when the female moults and he can fertilize her brood and also prevent other males gaining access to her. The duration of the guarding phase is influenced by the sizes of the animals in a pair; larger males guard for longer than do smaller males and larger females are guarded for longer than are smaller females. Also, larger males guard more tenaciously than do smaller males and females are guarded more tenaciously as their moult approaches. Finally, larger females are found to be more active in precopula than smaller females.

Zusammenfassung

Zur Paarung des Bachflohkrebses Gammarus pulex gehört eine längere Präkopula. So ist das Männchen sicher anwesend, wenn sich das Weibchen häutet, und kann die Eier besamen; außerdem hält es andere Männchen vom Weibchen fern. Die Dauer der Präkopula hängt von der Größe der Paarpartner ab; größere Männchen bewachen länger als kleine. Außerdem halten größere Männchen das Weibchen fester; auch werden Weibchen um so fester gehalten, je näher ihre Häutung bevorsteht. Größere Weibchen in Präkopula sind aktiver als kleine; welchen Vorteil sie davon haben, ist unklar.

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Tài liệu tham khảo

10.1111/j.1439-0310.1980.tb00724.x

10.1163/156854066X00045

Halliday T. R., 1978, Behavioural Ecology, 180

10.1080/00222937800770361

Hughes R. V.(1979):Precopula inGammarus pulex.Unpubl. Ph.D. Thesis Univ. of Liverpool.

10.2307/1718

Kinne O., 1959, Ecological data on the amphipod Gammarus duebenii, A monograph. Veröff. Inst. Meeresforsch. Bremerhaven, 6, 177

10.1016/0022-0981(78)90004-7

Linsenmair K. E., 1979, Untersuchungen zur Soziobiologie der Wüstenassel Hemilepistus reaumuri und verwandter Isopodenarten, Verh. Dtsch. Zool. Ges., 1979, 60

10.1163/156853975X00380

Smith Maynard J., 1976, Evolution and the theory of games, Am. Sci., 64, 41

O'Donald P., 1980, Genetic Models of Sexual Selection

10.1163/156853974X00327

Parker G. A., 1978, Behavioural Ecology, 214

Parker G. A., 1982, Current Problems in Sociobiology, 173

10.1163/156854061X00275

Richter G., 1978, Einige Beobachtungen zur Lebensweise des Flohkrebses Siphonoecetes della‐vallei, Natur. Museum, 108, 259

10.1111/j.1439-0310.1979.tb00697.x

Snedecor G. W., 1967, Statistical Methods

Strong D. R., 1972, Amphipod amplexus, the significance of ecotypic variation, Ecology, 54, 1383, 10.2307/1934203

10.1111/j.1365-2427.1981.tb01252.x

10.1163/156853981X00310

Trivers R. L., 1972, Sexual Selection and the Descent of Man, 136

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Wiley

Tập 64 Số 2

174-184

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