Life history pattern of mosquitofish Gambusia holbrooki (Girard, 1859) in the Tajan River (Southern Caspian Sea to Iran)
Life history pattern of mosquitofish Gambusia holbrooki (Girard, 1859) in the Tajan River (Southern Caspian Sea to Iran)
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DOI：
10.1007/s00343-011-0110-y
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发表时间：
2011-01
影响因子：
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通讯作者：
R. Patimar;M. Ghorbani;Ali Gol-Mohammadi;Hoda Azimi-Glugahi
中科院分区：
文献类型：
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作者：
R. Patimar;M. Ghorbani;Ali Gol-Mohammadi;Hoda Azimi-Glugahi
对新栖息地引入物种的生态学进行调查，可以确定进化变化的程度、方向和速度。在里海南部引进的霍尔布鲁克甘布西亚就是这样一种情况。研究了塔江河流域食蚊鱼的生活史特征。共744G。holbrookis标本是在2008年1月至12月间采集的。最大观测年龄雄性为0+岁，雌性为1+岁。两性均呈异速生长（男性呈阴性：b=2.442，女性呈阳性：b=3.232）。总体性别比例不平衡，女性占主导地位。GSI值表明g。2月至7月之间的冬季。5月份平均GSI值最高，雄性为1.80，雌性为15.97。卵直径为1.00至3.00毫米，平均值为2.098毫米。绝对繁殖力从7个到57个不等。卵径和绝对繁殖力均与鱼体大小（长、重）呈正相关。产卵量与总重的比值在34.44 ~ 582.64粒/g之间波动，与总长度的比值在2.33 ~ 12.95粒/cm之间波动。两者都与雌性体型呈负相关。这一种群的特征对该物种的生活史具有重要意义。
Investigation of the ecology of introduced species in new habitats can allow determinations of the degree, direction, and rate of evolutionary change. The introduction ofGambusia holbrookiin the southern Caspian Sea presents such a situation. We evaluated the life history traits of mosquitofish in the Tajan River basin. A total of 744G. holbrookispecimens were collected between January and December 2008. The maximum observed ages are 0+ years for males and 1+ years for females. Both sexes grew allometrically (negative for males:b=2.442 and positive for females:b=3.232). The overall sex ratio is unbalanced and dominated by females. GSI values suggest that this population ofG. holbrookimatures between February–July. The highest mean GSI value is 1.80 for males and 15.97 for females in May. Egg diameter ranges from 1.00 to 3.00 mm with a mean value of 2.098 mm. Absolute fecundity varied from 7 to 57 eggs. Both ova diameter and absolute fecundity were positively correlated to fish size (length and weight). Fecundity relative to total weight fluctuated from 34.44 to 582.64 eggs/g, and to total length from 2.33 to 12.95 eggs/cm. Both were negatively correlated with female size. The characteristics of this population are important with respect to life history of the species.