Trophic niche dynamics of three nearshore benthic predators in The Bahamas
Trophic niche dynamics of three nearshore benthic predators in The Bahamas
复制标题
巴哈马三种近岸底栖捕食者的营养生态位动态
DOI：
10.1007/s10750-018-3523-1
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发表时间：
2018
期刊：
影响因子：
2.6
通讯作者：
M. Power
中科院分区：
文献类型：
--
作者：
Oliver. N. Shipley;K. Murchie;Michael G. Frisk;O. O’Shea;M. Winchester;E. Brooks;J. Pearson;M. Power
利用碳和氮稳定同位素（δ 13 C和δ 15 N）研究了巴哈马群岛三种共生捕食者的营养生态位动态。核心营养生态位宽度和总营养生态位重叠的变量估计护士鲨鱼（Ginglymostoma cirratum），南方黄貂鱼（Hypanus americanus），和大西洋chupare黄貂鱼（Styracura schmardae）之间进行了观察。护士鲨与两种黄貂鱼的营养重叠很少，δ 15 N值较高，表明潜在的资源竞争有限。南部和大西洋chupare黄貂鱼表现出较高的总营养生态位重叠，突出了更高水平的资源竞争。护士鲨表现出最广泛的δ 13 C范围，这意味着利用多个资源池，以促进能源需求，相比南方黄貂鱼和大西洋chupare黄貂鱼。南方黄貂鱼表现出最小的核心营养生态位宽度，突出依赖于一个较窄的范围内的资源池，可能支持一个单一的栖息地类型。我们假设的持久性的三个子采样的捕食者种群的潜在资源分区和利用多个营养资源库的支持。对于缺乏数据的物种，需要关于营养生态位动态和资源利用模式的进一步信息，以确定种群和群落如何应对开发的不利影响，如渔业影响、生境改变和污染。
Carbon and nitrogen stable isotopes (δ13C and δ15N) were used to examine trophic niche dynamics of three co-occurring predators in The Bahamas. Variable estimates of core trophic niche width and total trophic niche overlap were observed between nurse sharks (Ginglymostoma cirratum), southern stingrays (Hypanus americanus), and Atlantic chupare stingrays (Styracura schmardae). Nurse sharks exhibited little trophic overlap with either species of stingray and exhibited higher δ15N values, suggesting limited potential resource competition. Southern and Atlantic chupare stingrays exhibited higher total trophic niche overlap, highlighting higher levels of resource competition. Nurse sharks exhibited the broadest δ13C range, implying utilization of multiple resource pools to facilitate energetic requirements, compared with southern stingrays and Atlantic chupare stingrays. Southern stingrays exhibited the smallest core trophic niche width, highlighting reliance upon a narrower range of resource pools, likely supported by a single habitat type. We postulate that the persistence of the three sub-sampled predator populations is supported by potential resource partitioning and utilization of multiple trophic resource pools. Further information regarding trophic niche dynamics and patterns of resource use is required for data-poor species to identify how populations and communities may respond to the adverse effects of exploitation, such as fisheries impacts, habitat alteration, and pollution.