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首页> 外文期刊>Marine biology >Effects of seasonality and population density on the reproduction of the Indo-Pacific echinoid Echinometra mathaei in Kenyan coral reef lagoons
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Effects of seasonality and population density on the reproduction of the Indo-Pacific echinoid Echinometra mathaei in Kenyan coral reef lagoons

机译：季节性和人口密度对肯尼亚珊瑚礁泻湖中印度洋-太平洋类海chinEchinometra mathaei繁殖的影响

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摘要

Reproduction in the widely distributed tropical sea urchin Echinometra mathaei (de Blainville) was examined in three Kenyan reef lagoons that differed in substrate cover and E. mathaei population density. Histological examination of the gonads and gonad index measurements for 3 years showed a seasonal reproductive cycle with gametogenesis commencing in July, when temperature and light are at their lowest, and spawning commencing in December and peaking in February to May, when temperature and light reach their annual maxima. Monthly gonad indices correlated significantly with seawater temperature and light intensity. Male urchins had mature gametes for a longer period (8 months) than females (6 months), possibly an adaptive strategy that increases the probability of fertilization. Lunar periodicity was not observed, as male and female gonads were full of gametes on all days of the lunar cycle during the period of spawning. The peak in spawning activity coincides with the peak in phytoplankton abundance, which could ensure high food availability for the planktonic larvae. Gonad weights were significantly higher relative to urchin weight at the reef having the largest mean sizes and lowest population of urchins, indicating availability of food resources for growth and reproduction. E. mathaei at the reef with the highest density had the smallest urchins and high relative gonad sizes, indicative of a tradeoff between growth and reproduction when food is limited.
机译：在三个肯尼亚礁泻湖中检查了分布广泛的热带海胆Echinometra mathaei（de Blainville）的繁殖情况，这些礁礁的底物覆盖率和E. mathaei人口密度不同。对性腺和性腺指数的3年组织学检查显示，季节性繁殖周期是从7月开始配子发生的，温度和光照处于最低点，产卵期从12月开始，在2月至5月达到峰值，而温度和光照达到峰值。年度最大值。每月性腺指数与海水温度和光照强度显着相关。雄性海胆的成熟配子比雌性（6个月）更长（8个月），这可能是一种适应策略，可增加受精的可能性。没有观察到月球周期，因为在产卵期间的月球周期的所有天，雄性腺和雌性腺都充满了配子。产卵活动的高峰与浮游植物丰度的高峰重合，这可以确保浮游幼虫的高食物利用率。在具有最大平均尺寸和最低海胆种群的礁石上，性腺重量相对于海胆重量而言明显更高，表明可用于生长和繁殖的食物资源的可用性。在珊瑚礁中密度最高的大肠埃希氏菌具有最小的海胆和较高的性腺大小，这表明在食物有限的情况下生长与繁殖之间需要权衡。

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