月繁殖节律的纬度变化：北方美洲蟾鱼亚种（Fundulus heteroclitus macrolepidotus）无月周期模式。

Latitudinal variability in lunar spawning rhythms: absence of a lunar pattern in the northern mummichog Fundulus heteroclitus macrolepidotus.

机构信息

Canadian Rivers Institute, University of New Brunswick, Department of Biology, P. O. Box 5050 University of New Brunswick, Saint John, New Brunswick E2L4L5, Canada.

出版信息

J Fish Biol. 2009 Sep;75(4):885-900. doi: 10.1111/j.1095-8649.2009.02338.x.

DOI:10.1111/j.1095-8649.2009.02338.x

PMID:20738585

Abstract

In this study, the natural spawning season of the northern mummichog Fundulus heteroclitus macrolepidotus was examined from May to July in the lower St John River, New Brunswick, Canada (45 degrees N), through measurements of gonado-somatic index (I(G)), liver-somatic index (I(L)) and condition factor (K). I(G) increased during the prespawning phase (mean +/-s.e. 5.49 +/- 0.20%), peaked during the spawning phase (14.68 +/- 0.51%) and dropped during the regression phase (3.23 +/- 0.29%). A single peak of spawning was observed in F. h. macrolepidotus, contrasting with multiple peaks observed in studies south of 41 degrees N in North America. Within the prespawning phase, there were significant differences between sampling dates in female body mass, gonad mass, liver mass and K. On the basis of results from this study, water temperature is believed to be the predominant factor controlling initiation of spawning in F. h. macrolepidotus.

摘要

本研究于加拿大新不伦瑞克省圣约翰河下游（45°N），于 5 月至 7 月期间，通过测量性腺-体指数（I(G)）、肝-体指数（I(L)）和条件因子（K），研究了北方美洲红点鲑 Fundulus heteroclitus macrolepidotus 的自然产卵季节。在产卵前期（平均值 +/- 标准误 5.49 +/- 0.20%），I(G) 增加，在产卵期（14.68 +/- 0.51%）达到峰值，在恢复期（3.23 +/- 0.29%）下降。在本研究中，观察到北方美洲红点鲑 Fundulus heteroclitus macrolepidotus 出现了单一的产卵高峰，而在北美的 41°N 以南的研究中则观察到了多个产卵高峰。在产卵前期内，不同的采样日期之间，雌性的体重、性腺质量、肝脏质量和 K 存在显著差异。基于本研究的结果，人们认为水温是控制北方美洲红点鲑 Fundulus heteroclitus macrolepidotus 产卵开始的主要因素。