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首页> 外文期刊>Estuarine Coastal and Shelf Science >Seasonal variation and tidal influences on estuarine use by bottlenose dolphins (Tursiops aduncus)
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Seasonal variation and tidal influences on estuarine use by bottlenose dolphins (Tursiops aduncus)

机译：宽吻海豚对河口使用的季节性变化和潮汐影响

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摘要

In order to show that dolphins use estuary habitats differently depending on the season and tidal state, possibly in response to prey distribution, temperature, risk of stranding and accessibility, Indo-Pacific bottlenose dolphins (Tursiops aduncus) were observed year-round during a 3-year study in the Clarence River estuary (CR) and Richmond River estuary (RR) in northern New South Wales, Australia. Peak dolphin sightings occurred during the spring season and one or 2 h prior to high tide. The spatial distribution of the dolphins in each estuary was analysed using the distance in kilometres that thedolphins travelled upstream with seasons and tidal phase as determinants. A General Linear Model showed that in the CR the dolphin spatial distribution in the estuary was not determined by season (F = 0.434, df = 3, P = 0.729) but was by tidal phase (F = 9.943, df = 3, P < 0.001) and the interaction between season and tidal phase (F = 3.398, df = 9, P < 0.002). However, in the RR the spatial distribution of the dolphin use of the estuary was not determined by either season (F = 1.647, df = 3, P = 0.194) or tidal phase (F = 0.302, df = 3, P = 0.824). In the CR, the spatial distribution of the dolphins was largest on high and flood tides. This pattern of spatial distribution may occur because the CR is a relatively shallow estuary and this increased spatial distribution may reflect a lower stranding risk and an increase in accessibility of shallow areas during periods of higher tide. These areas could also provide access to their preferred prey items of sea mullet (Mugil cephalus) and sand whiting (Sillago ciliata).
机译：为了显示海豚根据季节和潮汐状态而对河口栖息地的使用方式不同，可能是由于猎物的分布，温度，搁浅的风险和可及性所致，在3至3年中全年观察到印度太平洋宽吻海豚（Tursiops aduncus）在澳大利亚新南威尔士州北部的克拉伦斯河河口（CR）和里士满河河口（RR）进行了为期一年的研究。在春季和高潮发生前一或两小时，海豚见顶高峰。利用海豚上游行进的距离（以季节和潮汐相位为决定因素），分析了每个河口中海豚的空间分布。通用线性模型显示，在CR中，河口的海豚空间分布不是由季节决定的（F = 0.434，df = 3，P = 0.729），而是由潮汐阶段（F = 9.943，df = 3，P < 0.001）和季节与潮汐阶段之间的相互作用（F = 3.398，df = 9，P <0.002）。但是，在RR中，河口海豚使用的空间分布不是由季节（F = 1.647，df = 3，P = 0.194）或潮汐期（F = 0.302，df = 3，P = 0.824）决定的。 。在CR中，海豚的空间分布在涨潮和洪水时最大。之所以会出现这种空间分布模式，是因为CR是一个相对较浅的河口，而这种增大的空间分布可能反映出较低的搁浅风险以及在涨潮期间浅层区域的可及性增加。这些地区还可以提供其首选的鱼（M鱼（Mugil cephalus）和白鱼（Sillago ciliata））的猎物。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2011年第4期|p.389-395|共7页
  • 作者

    Christine A. Fury; Peter L Harrison;

  • 作者单位

    Marine Ecology Research Centre, School of Environmental Science and Management, Southern Cross University, PO Box 157, Lismore, New South Wales 2480, Australia;

    Marine Ecology Research Centre, School of Environmental Science and Management, Southern Cross University, PO Box 157, Lismore, New South Wales 2480, Australia;

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  • 正文语种 eng
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  • 关键词

    dolphins estuaries tides habitats distribution season;

    机译：海豚河口潮汐栖息地分布季节;

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