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首页> 外文学位 >Mottled sculpin in a dynamic landscape: Linking environmental heterogeneity, individual behaviors, and population dynamics in a southern Appalachian stream.
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Mottled sculpin in a dynamic landscape: Linking environmental heterogeneity, individual behaviors, and population dynamics in a southern Appalachian stream.

机译：在动态景观中斑驳的鱼：将环境异质性，个体行为和人口动态联系起来，在阿巴拉契亚南部河流中。

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摘要

Stream ecosystems are characterized by a high degree of spatial and temporal heterogeneity. I examined the effects of environmental heterogeneity on the foraging behaviors and population dynamics of a predatory benthic stream fish, the mottled sculpin (Cottus bairdi), in a southern Appalachian stream. Specifically, my research addressed two primary objectives: (1) to characterize the individual level response of mottled sculpin to prey patch dynamics; and (2) to link individual sculpin behaviors to sculpin population dynamics in a dynamic landscape. To characterize the individual level responses of mottled sculpin to resource heterogeneity, I compared the movement and foraging behaviors of sculpin with those expected of an organism foraging optimally in a patchy landscape. I obtained the following results from these analyses: (1) mottled sculpin exhibited two distinct movement behaviors, area restricted movements within resource patches (i.e., patch use) and directional movements between patches (i.e., patch abandonment); (2) adult sculpin focused their foraging activities within patches of high prey density and high prey colonization rates; (3) adult sculpin abandoned patches in response to a patch “giving up density” that was significantly lower than the average density of resources within patches available in the landscape; and (4) size-dependent social interactions among sculpin inhibited the ability of juvenile sculpin to utilize prey patches efficiently. To link individual sculpin behaviors to sculpin population dynamics in this system, I conducted an individual mark-recapture study of sculpin populations over a four-year period. I used these data to characterize habitat selection by individual sculpin and to characterize the spatio-temporal dynamics of sculpin populations. Habitat selection by sculpin was consistent with an “Ideal Despotic” model of habitat selection. Furthermore, habitat selection by sculpin and habitat-dependent survivorship of juveniles provided a mechanistic explanation for the relatively high spatial and temporal stability of sculpin populations observed in this system. Overall, the results of my research indicate that environmental heterogeneity in a southern Appalachian stream has important consequences for sculpin behaviors, demography, and population dynamics. Additional studies such as mine should enable researchers to elucidate the mechanistic linkages between environmental heterogeneity, individual behaviors, and population dynamics for stream fishes in other systems.
机译：河流生态系统的特征是高度的时空异质性。我检查了环境异质性对南部阿巴拉契亚溪流掠食性底栖溪流鱼（斑驳的s鱼）的觅食行为和种群动态的影响。具体而言，我的研究解决了两个主要目标：（1）表征斑驳的cul鱼对猎物斑块动力学的个体水平响应; （2）将单个雕刻人的行为与动态景观中的雕刻人动态联系起来。为了表征斑驳的s鱼对资源异质性的个体水平响应，我比较了cul鱼movement的运动和觅食行为与在斑驳的景观中最佳觅食生物的预期行为。我从这些分析中获得了以下结果：（1）斑驳的鱼表现出两种不同的运动行为，即资源斑块内的区域限制运动（即斑块使用）和斑块之间的定向运动（即斑块废弃）; （2）成年将其觅食活动集中在高猎物密度和高猎物定植率的斑块中; （3）对“放弃密度”的一块斑块进行打草，以使成年废弃的斑块明显低于景观中可用斑块内资源的平均密度； （4）sculpin之间大小相关的社会互动抑制了幼小sculpin有效利用猎物斑块的能力。为了在此系统中将单个杜鹃的行为与杜鹃种群动态联系起来，我在四年的时间里对杜鹃种群进行了标记回收研究。我使用这些数据来表征单个的栖息地选择，并描绘ize种群的时空动态。 sculpin的栖息地选择与栖息地选择的“理想专制”模型相一致。此外，通过的栖息地选择和依赖于栖息地的未成年生还为在该系统中观察到的种群的相对较高的时空稳定性提供了机械解释。总体而言，我的研究结果表明，南部阿巴拉契亚河流域的环境异质性对雕刻行为，人口统计和人口动态具有重要影响。矿山等其他研究应使研究人员能够阐明环境异质性，个体行为与其他系统中溪流鱼类种群动态之间的机械联系。

著录项

  • 作者

    Petty, Jeffrey Todd.;

  • 作者单位

    University of Georgia.;

  • 授予单位 University of Georgia.;
  • 学科 Biology Ecology.; Agriculture Fisheries and Aquaculture.; Biology Limnology.
  • 学位 Ph.D.
  • 年度 1998
  • 页码 156 p.
  • 总页数 156
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生态学（生物生态学）;水产、渔业;
  • 关键词

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