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The paradox of the Hauraki Gulf snapper population: Testing the nursery habitat concept

机译：豪拉基湾鲷鱼种群的悖论：测试苗圃栖息地概念

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摘要

Juvenile nursery habitats are a critical requirement for the maintenance of some fish populations. Snapper in northern New Zealand is hypothesised to fit this nursery habitat model; however, nursery habitat association and dependency are poorly understood for New Zealand's largest snapper population in the Hauraki Gulf. To better understand habitat usage by post-settlement snapper and identify potential nursery habitats, we surveyed fish communities across a range of structured benthic habitats using fixed-position seabed cameras in Kawau Bay, in the northwestern Hauraki Gulf. Results indicated a low overall abundance of post-settlement snapper, relative to previous surveys at a nearby harbour outside of the Hauraki Gulf. There were also amongst-habitat differences in Kawau Bay, with post-settlement snapper and fish diversity higher in association with horse mussels relative to bare sediment. We anticipated high abundance of post-settlement snapper at restored green-lipped mussel bed sites, but abundance was again low relative to previous surveys outside of the Gulf. While Hauraki Gulf locations other than Kawau Bay may serve as nursery habitats with abundant populations of post-settlement snapper, another possibility is that post-settlement snapper habitat may not be as limiting within the expansive semi-sheltered Hauraki Gulf (potentially following an Effective Juvenile Habitat model). This hypothesis requires further investigation, as the answer could alter the emphasis of habitat conservation and restoration efforts in the area.
机译：幼稚园的栖息地是维持某些鱼类种群的关键条件。据推测，新西兰北部的鲷鱼适合这种苗圃栖息地模型。然而，对于新西兰豪拉基湾最大的鲷鱼种群而言，对苗圃栖息地的关联性和依赖性的了解却很少。为了更好地了解沉降后鲷鱼的栖息地使用情况并确定潜在的苗圃栖息地，我们使用了位于豪拉基湾西北部Kawau湾的固定位海底照相机，对了一系列结构化底栖生境中的鱼类群落进行了调查。结果表明，相对于之前在浩拉基湾外附近港口进行的调查，沉降后鲷鱼的总体丰度较低。在Kawau湾，栖息地之间也存在差异，相对于裸露的沉积物，与贻贝相关的沉降后鲷鱼和鱼类多样性更高。我们预计恢复后的绿色唇贻贝河床地点的沉降后鲷鱼会大量繁殖，但相对于之前在墨西哥湾以外的调查而言，其再次再次处于低位。尽管豪沃基湾（Kauau Bay）以外的豪拉基湾（Hauraki Gulf）地点可能是苗圃栖息地，有大量的定居后鲷鱼，但另一种可能性是，定居后的鲷鱼栖息地可能不会在广阔的半庇护的豪拉基湾（Hauraki Gulf）中受到限制（可能是在有效幼体之后栖息地模型）。该假设需要进一步研究，因为答案可能会改变该地区栖息地保护和恢复工作的重点。

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