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首页> 外文学位 >The Potential for Competition Between the Red-bellied Turtle (Pseudemys rubriventris) and the Red-eared Slider Turtle (Trachemys scripta elegans).
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The Potential for Competition Between the Red-bellied Turtle (Pseudemys rubriventris) and the Red-eared Slider Turtle (Trachemys scripta elegans).

机译：红腹龟（Pseudemys rubriventris）和红耳滑龟（Trachemys scripta elegans）之间的竞争潜力。

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摘要

Invasive species are a significant cause of biodiversity declines on a global scale and novel species interactions often cause ecological damage through predation or competition. The red-eared slider turtle ( Trachemys scripta elegans) has been introduced to wetlands globally and negatively impacts other native turtle species. In Pennsylvania, USA, the red-eared slider turtle is ecologically similar to the PA, state threatened redbellied turtle (Pseudemys rubriventris). The objective of this dissertation is to examine the potential for competition between red-eared slider turtles and red-bellied turtles using field studies of adult free ranging turtles and manipulative studies of juvenile turtles in mesocosms. Field studies utilized intensive trapping, radio telemetry, stomach flushing, fecal sample collection and stable isotopes to determine populations sizes, spatial resource use and dietary resource use of both species. Intensive trapping and radio telemetry revealed that both species used wetland habitats ubiquitously. Dietary studies revealed that at a smaller, more highly fragmented and vegetative species depauperate wetland complex, red-eared slider turtles and red-bellied turtles overlapped extensively for dietary resources while at a larger, intact, more vegetative species rich wetland the diets of both species were partitioned. In manipulative experiments in which red-eared slider turtles and red-bellied turtles were housed in low resource availability groups and high resource availability groups with conspecifics or in mixed species groups red-eared slider turtles were competitively superior to red-bellied turtles. Field study results suggest that the potential for competition between red-eared slider turtles and red-bellied turtles varies depending on local habitat characteristics, while manipulative experiment results suggest that red-eared slider turtles are competitively superior in resource limited environments. These results combined suggest that in degraded wetland habitats, when resources become limited, red-eared slider turtles will have a competitive advantage over red-bellied turtles potentially leading to population declines. Red-eared slider turtles should not be sold outside of their native range as pets and when possible they should be removed from wetland habitats outside of their native range. Furthermore, wetland habitats should be managed and preserved to provide intact, species rich and species diverse habitats.
机译：外来入侵物种是全球范围内生物多样性下降的重要原因，新物种之间的相互作用通常通过掠食或竞争而造成生态破坏。红耳滑龟（Trachemys scripta elegans）已被引入全球湿地，并对其他本地龟种产生负面影响。在美国宾夕法尼亚州，红耳滑龟在生态学上与宾夕法尼亚州濒危的红腹龟（Pseudemys rubriventris）相似。本文的目的是通过对成年自由放养海龟的野外研究和对中观中幼龟的操纵性研究来检验红耳海龟和红腹海龟之间竞争的潜力。实地研究利用密集诱捕，无线电遥测，胃冲洗，粪便样品收集和稳定同位素来确定这两种物种的种群大小，空间资源利用和饮食资源利用。密集诱捕和无线电遥测表明，这两种物种都普遍使用了湿地生境。饮食研究表明，在较小，高度零散且营养丰富的物种使湿地复杂化的情况下，红耳turtle和红腹龟在饮食资源上有很大重叠，而在较大，完整，营养丰富的物种中，两种物种的饮食被分区。在操纵性实验中，将红耳slider龟和红腹龟安置在低资源可用性组和高资源可用性组中，具有特定的物种，或者在混合物种组中，红耳slider龟在竞争上优于红腹龟。野外研究结果表明，红耳slider和红腹龟之间竞争的潜力因当地栖息地的特性而异，而操纵实验结果表明，红耳slider在资源有限的环境中具有竞争优势。这些结果加起来表明，在退化的湿地生境中，当资源有限时，红耳滑龟将比红腹龟具有竞争优势，有可能导致种群减少。红耳滑龟不应作为宠物出售，而应尽可能从其本地范围以外的湿地栖息地中移出。此外，应管理和保护湿地栖息地，以提供完整，物种丰富和物种多样化的栖息地。

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  • 作者

    Pearson, Steven Henry.;

  • 作者单位

    Drexel University.;

  • 授予单位 Drexel University.;
  • 学科 Agriculture Wildlife Conservation.;Biology Ecology.;Agriculture Wildlife Management.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 148 p.
  • 总页数 148
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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