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首页> 外文期刊>Molecular ecology >Limited ecological connectivity of an arboreal marsupial across a forest/plantation landscape despite apparent resilience to fragmentation
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Limited ecological connectivity of an arboreal marsupial across a forest/plantation landscape despite apparent resilience to fragmentation

机译：森林/人工林在森林/人工林景观上的生态连通性有限，尽管明显具有抗破碎性

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Demographic and genetic replenishment of populations through the exchange of individuals is essential for their persistence. Habitat loss and fragmentation can reduce the permeability of landscapes, hinder dispersal and compromise the genetic integrity of populations over time. We examined ecological connectivity in an arboreal marsupial, the common ringtail possum (Pseudocheirus peregrinus) in fragmented forests of southeastern Australia. This species is potentially robust to fragmentation based on its presence in degraded landscapes and known use of plantations for foraging and nesting. Using 312 individuals screened at 15 microsatellites, we measured dispersal and gene flow across seven native Eucalyptus forest remnants surrounded by exotic Pinus radiata plantations and three sites within a large continuous forest. The permeability of the pine matrix to dispersing possums was significantly lower than that of the native forest. Small, isolated patches exhibited signatures of genetic drift, having lower heterozygosity and allelic richness than possums in large patches. Most (87%) possums were born in their sampled patch or dispersed only short distances into neighbouring remnants. The continuous forest was identified as an important source of immigrants only for proximate patches (within 2.5 km), thus emphasizing for the common ringtail possum and more specialized arboreal mammals the need to conserve large, proximate forest remnants. Our findings highlight the importance of using genetic tools to understand the long-term biological consequences of fragmentation for effective management.
机译：通过个人交流对人口进行人口统计和遗传补充对他们的持久性至关重要。生境的丧失和破碎化会降低景观的通透性，阻碍扩散，并随着时间的推移损害种群的遗传完整性。我们研究了在澳大利亚东南部零碎森林中的有树有袋动物（常见的环尾负鼠（Pseudocheirus peregrinus））中的生态连通性。基于其在退化景观中的存在以及已知用于人工觅食和筑巢的人工林的使用，该物种对于破碎具有潜在的鲁棒性。利用在15个微卫星上筛选的312个个体，我们测量了分布在七个本地桉树森林遗迹中的散布和基因流，这些残留物被奇异的辐射松人工林和一个大型连续森林中的三个地点包围。松树基质对负鼠的渗透性显着低于原生森林。小的，分离的补丁显示出遗传漂移的特征，与大补丁中的负鼠相比，杂合度和等位基因丰富度更低。大多数（87％）负鼠出生于其采样斑块中，或仅短距离散布到相邻的残余物中。仅在最近的斑块（2.5公里以内），连续森林就被认为是重要的移民来源，因此强调了常见的环尾负鼠和更专业的树栖哺乳动物需要保护大量的近森林残余物。我们的发现凸显了使用遗传工具了解片段化对于长期有效管理的长期生物学后果的重要性。

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