Spatial variation in the effects of size and age on reproductive dynamics of common coral trout Plectropomus leopardus
Spatial variation in the effects of size and age on reproductive dynamics of common coral trout Plectropomus leopardus
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DOI：
10.1111/jfb.12346
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发表时间：
2014-04-01
影响因子：
2
通讯作者：
Mapstone, B. D.
中科院分区：
文献类型：
--
作者：
Carter, A. B.;Russ, G. R.;Mapstone, B. D.
比较了开放和封闭(无捕捞海洋保护区)珊瑚礁以及澳大利亚大堡礁(GBR)4个地理区域普通珊瑚鲑鱼种群的大小和年龄对繁殖动态的影响。调查的具体生殖指标是雌雄比例、产卵黄雌体比例和当地种群产卵率。随着长度和年龄的增长，性别比例变得越来越偏向男性，这是对原雌鸟的预期，但在GBR的南部地区(Mackay和Storm Cay)，在所有长度和年龄段的北部地区(蜥蜴岛和汤斯维尔)，性别比例都更加偏向男性。黄化雌体的比例也随着身长和年龄的增加而增加。在产卵季节，雌体能每日产卵，但平均每4个中心点3天产卵一次。成熟雌性在汤斯维尔保护区礁石(每隔2个中心点3天)和蜥蜴岛鱼礁(每隔3个中心点2天)产卵最频繁。在开放捕鱼的马凯礁上，雌鱼在4年的采样中没有产卵的证据，而保护区礁上的雌鱼每2-3个月才产卵一次。长度对产卵频率没有影响。蜥蜴岛鱼礁的产卵频率随着年龄的增长而增加，风暴礁的产卵频率随着年龄的增长而下降，所有地区的保护区珊瑚礁的产卵频率都随着年龄的增长而下降。据推测，GBR区域间赤潮鱼性比和产卵频率的变化主要是由水温驱动的，而禁捕管理区影响产卵频率取决于保护区所在的区域。在成虫密度最高的南部GBR上，男性偏向和缺乏产卵活动表明，新兵可能来自中部或北部GBR。繁殖特征的显著区域差异表明，采用区域办法管理麻黄地鼠是适当的，并突出表明有必要考虑将保护区用作渔业或养护管理工具的繁殖的空间差异。
The effects of size and age on reproductive dynamics of common coral trout Plectropomus leopardus populations were compared between coral reefs open or closed (no-take marine reserves) to fishing and among four geographic regions of the Great Barrier Reef (GBR), Australia. The specific reproductive metrics investigated were the sex ratio, the proportion of vitellogenic females and the spawning fraction of local populations. Sex ratios became increasingly male biased with length and age, as expected for a protogyne, but were more male biased in southern regions of the GBR (Mackay and Storm Cay) than in northern regions (Lizard Island and Townsville) across all lengths and ages. The proportion of vitellogenic females also increased with length and age. Female P. leopardus were capable of daily spawning during the spawning season, but on average spawned every 4 center dot 3 days. Mature females spawned most frequently on Townsville reserve reefs (every 2 center dot 3 days) and Lizard Island fished reefs (every 3 center dot 2 days). Females on Mackay reefs open to fishing showed no evidence of spawning over 4 years of sampling, while females on reserve reefs spawned only once every 2-3 months. No effect of length on spawning frequency was detected. Spawning frequency increased with age on Lizard Island fished reefs, declined with age on Storm Cay fished reefs, and declined with age on reserve reefs in all regions. It is hypothesized that the variation in P. leopardus sex ratios and spawning frequency among GBR regions is primarily driven by water temperature, while no-take management zones influence spawning frequency depending on the region in which the reserve is located. Male bias and lack of spawning activity on southern GBR, where densities of adult P. leopardus are highest, suggest that recruits may be supplied from central or northern GBR. Significant regional variation in reproductive traits suggests that a regional approach to management of P. leopardus is appropriate and highlights the need for considering spatial variation in reproduction where reserves are used as fishery or conservation management tools.