Identifying critical estuarine seagrass habitat for settlement of coastally spawned fish
Identifying critical estuarine seagrass habitat for settlement of coastally spawned fish
复制标题
确定沿海产卵鱼类定居的关键河口海草栖息地
DOI：
10.3354/meps08582
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发表时间：
2010
影响因子：
2.5
通讯作者：
I. Suthers
中科院分区：
文献类型：
--
作者：
John R. Ford;Robert J. Williams;Ashley M. Fowler;Deborah R. Cox;I. Suthers
识别和保护具有持续高沉降的地点对于保护沿海鱼类种群的补充是必要的。我们调查了澳大利亚东海岸4个温带河口狭窄入口（<500 m宽）的沿海产卵幼鱼的初始定居模式。对栖息地结构（海草覆盖度、叶片长度和海龙密度）、景观（斑块隔离度、周长与面积比和距海洋的距离）和水文因素（最大流速、潮量和模拟的被动颗粒输送）进行了研究，作为海草床沉降模式的可能解释。一个网站内的麦觉理湖和史密斯湖内的1个网站被发现有一贯的高解决9沿海产卵类群在不同的月份，因此被确定为解决“热点”。潮气量的大小，被动颗粒和补丁隔离一起解释了70%的沉降变化。高定居点的特点是（1）靠近一个高容量的通道提供丰富的幼虫和（2）被隔离，从其他海草补丁集中定居。定居点的月变化虽然影响物种组成和鱼类总丰度，但并没有改变所确定的热点的相对重要性，这表明这些共同因素正在推动不同物种的定居。
Identifying and conserving sites with consistently high settlement is necessary for pro- tecting recruitment of coastal fish populations. We investigated the initial settlement patterns of coastally spawned juvenile fish entering 4 temperate estuaries with narrow entrances (<500 m wide) on the eastern coast of Australia. Habitat structure (seagrass cover, blade length and syngnathid den- sity), landscape (patch isolation, perimeter to area ratio and distance to ocean) and hydrological fac- tors (maximum current speed, tidal volume and modelled delivery of passive particles) were investi- gated as possible explanations for settlement patterns into seagrass beds. One site within Lake Macquarie and 1 site within Smiths Lake were found to have consistently high settlement of 9 coastally spawned taxa over different months and were therefore identified as settlement 'hotspots'. The magnitude of tidal volume, the modelled delivery of passive particles and patch isolation together explained 70% of variation in settlement. Sites of high settlement were characterised as (1) being near to a high-volume channel supplying an abundance of larvae and (2) being isolated from other seagrass patches to concentrate settlement. Monthly variation in settlement, while affecting species composition and total fish abundance, did not alter the relative importance of the identified hotspots, suggesting that these common factors were driving settlement across different species.