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Comparative thermal biology and associated niche differentiation among the five-lined skinks.

机译：五行石龙子之间的比较热生物学和相关的生态位分化。

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摘要

Three species of five-lined skinks (Plestiodon fasciatus, P. laticeps, and P. inexpectatus) occur in regional sympatry across much of the Southeastern United States. These closely-related species, at one or more levels of development, all exhibit a similar phenotype and a high amount of prey resource overlap as documented by published data. Under the competitive exclusion hypotheses, these species should therefore not locally co-occur. This study confirms, through analysis of habitat type and canopy cover at the point of capture, that P. inexpectatus and P. fasciatus do not typically inhabit the same forest habitat. In fact, where their ranges overlap, P. fasciatus inhabits closed-canopy hardwood forests, while P. inexpectatus inhabits open forested habitats such as longleaf pine savannah and coastal scrub forests. P. laticeps is routinely found in sympatry with either species. Due to their large adult size, P. laticeps may be able to utilize larger prey, thereby partitioning available resources. Physiological data, such as oxygen consumption (VO2) and its temperature response (Q 10), support the hypothesis that these species differ with respect to their metabolic response to temperature. P. fasciatus exhibits a high Q10 at the interval that exceeds the mean daily summer temperature of sampled closed canopy forests (∼25°C). P. inexpectatus exhibits a dramatic decrease in metabolic rate on the interval that falls below the mean daily summer temperatures of sampled Longleaf Pine Savannah habitat. The VO2 of P. laticeps is the least temperature sensitive. The specific dynamic action (SDA), a measure of the amount of energy required to digest a food item, and SDA coefficient, the relative efficiency of food digestion, were also measured and support the hypothesis that P. fasciatus is physiologically better suited for cooler, closed-canopy habitats while P. inexpectatus is physiologically suited for warmer, open-canopy habitats. Collectively, these findings indicate that an evolutionarily conserved physiological niche among species may play an important role in spatial resource partitioning and maintenance of biodiversity among closely-related species.
机译：在美国东南部的大部分地区，三行五行石龙鱼（Plestiodon fasciatus，P。laticeps和P. inexpectatus）出现在区域象征物中。这些紧密相关的物种，在一个或多个发育水平上，都表现出相似的表型，并且猎物资源重叠程度很高，如公开数据所记录。因此，在竞争排斥假设下，这些物种不应在本地同时存在。通过分析捕获点的生境类型和树冠覆盖，该研究证实了P. inexpectatus和P. fasciatus通常不栖息在同一森林中。实际上，在它们的范围重叠的地方，fasciatus栖息于密闭冠层的阔叶林中，而inexpectatus则栖息于开阔的生境中，例如长叶松树大草原和沿海灌木林。通常在与这两种物种共生的情况下都发现P. laticeps。由于它们的成年个体很大，所以P. laticeps可能能够利用更大的猎物，从而划分可用资源。生理数据，例如耗氧量（VO2）及其温度响应（Q 10），支持以下假设：这些物种在对温度的新陈代谢方面有所不同。筋膜假单胞菌表现出较高的Q10值，其时间间隔超过抽样的封闭冠层森林的夏季平均日温度（〜25°C）。在低于采样的长叶松大草原栖息地的夏季平均每日温度的时间间隔内，P。inexpectatus的代谢速率显着下降。鼠李糖的VO2对温度的敏感性最低。还测量了比动态作用（SDA）（一种消化食物所需的能量的量度）和SDA系数（食物消化的相对效率），并支持假单胞菌在生理上更适合冷藏的假设。 ，闭盖生境，而P. inexpectatus在生理上适合温暖，开放的生境。总的来说，这些发现表明物种间进化上保守的生理生态位可能在空间资源分配和密切相关物种间生物多样性的维持中发挥重要作用。

著录项

  • 作者

    Watson, Charles Matthew.;

  • 作者单位

    The University of Texas at Arlington.;

  • 授予单位 The University of Texas at Arlington.;
  • 学科 Biology Ecology.;Biology Animal Physiology.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 88 p.
  • 总页数 88
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:39:16

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