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首页> 外文期刊>Marine ecology progress series >Extensive geographic and ontogenetic variation characterizes the trophic ecology of a temperate reef fish on southern California (USA) rocky reefs
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Extensive geographic and ontogenetic variation characterizes the trophic ecology of a temperate reef fish on southern California (USA) rocky reefs

机译:广泛的地理和个体发育变化表征了南加利福尼亚(美国)岩石礁上的温带礁鱼的营养生态

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摘要

Interactions between predator and prey act to shape the structure of ecological communities, and these interactions can differ across space. California sheephead Semicossyphus pulcher are common predators of benthic invertebrates in kelp beds and rocky reefs in southern California, USA. Through gut content and stable isotope (8~(13)C and 8~(15)N) analyses, we investigated geographic and ontogenetic variation in trophic ecology across 9 populations located at island and mainland sites throughout southern California. We found extensive geographic variation in California sheephead diet composition over small spatial scales. Populations differed in the proportion of sessile filter/suspension feeders or mobile invertebrates in the diet. Spatial variation in diet was highly correlated with other life history and demographic traits (e.g. growth, survivorship, reproductive condition, and energy storage), in addition to proxies of prey availability from community surveys. Multivariate descriptions of the diet from gut contents roughly agreed with the spatial groupings of sites based on stable isotope analysis of both California sheephead and their prey. Ontogenetic changes in diet occurred consistently across populations, despite spatial differences in size structure. As California sheephead increase in size, diets shift from small filter feeders, like bivalves, to larger mobile invertebrates, such as sea urchins. Our results indicate that locations with large California sheephead present, such as many marine reserves, may experience increased predation pressure on sea urchins, which could ultimately affect kelp persistence.
机译:捕食者与猎物之间的相互作用形成了生态群落的结构,并且这些相互作用在空间中可能会有所不同。加利福尼亚的羊头Semicossyphus pulcher是美国南部加利福尼亚州海带床和礁石中底栖无脊椎动物的常见捕食者。通过肠道含量和稳定的同位素(8〜(13)C和8〜(15)N)分析,我们调查了整个加利福尼亚南部岛屿和大陆地区9个种群的营养生态学地理分布和个体发育变化。我们发现加利福尼亚羊头饮食组成在较小的空间尺度上存在广泛的地理差异。饮食中无柄滤池/悬浮喂食器或移动无脊椎动物的比例有所不同。饮食的空间变化与其他生活史和人口统计特征(例如生长,生存,生殖状况和能量存储)高度相关,此外还可以根据社区调查获得猎物的可用性。根据加利福尼亚羊头及其猎物的稳定同位素分析,对肠道内容物饮食的多变量描述与场所的空间分组大致相符。尽管大小结构存在空间差异,但饮食的个体遗传学变化始终存在。随着加州绵羊头尺寸的增加,饮食从诸如双壳类的小型滤食性饲养转变为诸如海胆之类的大型活动无脊椎动物。我们的结果表明,加利福尼亚羊头较大的地区,例如许多海洋保护区,可能会遭受海胆捕食的压力增加,最终可能会影响海带的持久性。

著录项

  • 来源
    《Marine ecology progress series》 |2011年第16期|p.227-244|共18页
  • 作者单位

    Marine Science Institute, University of California Santa Barbara, California 93106-6150, USA,Moss Landing Marine Laboratories, 8272 Moss Landing Rd, Moss Landing, California 95039, USA;

    Marine Science Institute, University of California Santa Barbara, California 93106-6150, USA;

    Marine Science Institute, University of California Santa Barbara, California 93106-6150, USA;

    Marine Science Institute, University of California Santa Barbara, California 93106-6150, USA;

    Marine Science Institute, University of California Santa Barbara, California 93106-6150, USA;

    Department of Zoology and Physiology, University of Wyoming, 1000 E. University Ave, Dept 3166, Laramie,Wyoming 82071, USA;

    Department of Biological Sciences, California State University Long Beach, 1250 Bellflower Blvd. Long Beach,California 90840, USA;

    Department of Biology, Moore Laboratory of Zoology, Occidental College, 1600 Campus Rd, Los Angeles, California 90041,USA;

    Department of Biological Sciences, California State University Long Beach, 1250 Bellflower Blvd. Long Beach,California 90840, USA;

    Department of Biological Sciences, California State University Long Beach, 1250 Bellflower Blvd. Long Beach,California 90840, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    california sheephead; channel islands; demographic consequences; feeding habit; gut contents; semicossyphus pulcher; spatial variability; stable isotopes;

    机译:加利福尼亚羊头;海峡群岛;人口后果;喂养习惯;肠内容物;cos虫;空间变异性;稳定同位素;

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