Physiological Responses to Salinity Vary with Proximity to the Ocean in a Coastal Amphibian
Physiological Responses to Salinity Vary with Proximity to the Ocean in a Coastal Amphibian
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DOI：
10.1086/687292
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发表时间：
2016-07-01
影响因子：
1.6
通讯作者：
French, Susannah S.
中科院分区：
文献类型：
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作者：
Hopkins, Gareth R.;Brodie, Edmund D., Jr.;French, Susannah S.
淡水生物越来越多地暴露在其栖息地的高盐度下，对体内平衡提出了生理挑战。两栖动物特别容易受到渗透压的影响，但在世界各地的各种内陆和沿海环境中经常受到高盐度的影响。在这里，我们研究的生理反应，以提高盐度的粗糙皮肤的蝾螈（Taricha granulosa）栖息在北美太平洋沿岸的沿海溪流，并比较的生理反应，以盐度胁迫的蝾螈生活在靠近海洋的蝾螈生活在更远的上游。虽然盐度升高显着影响的渗透（体重，血浆渗透压），压力（皮质酮），和免疫（杀菌能力）反应的蝾螈，动物发现更接近海洋一般反应较低的盐胁迫比那些发现更远的上游。我们的研究结果提供了可能的证据，在这个物种在沿海环境中的一些生理耐受性的盐度升高。随着淡水环境变得越来越咸，压力越来越大，了解两栖动物等弱势群体的生理耐受性对于我们了解它们的反应能力，适应能力以及最终生存能力将变得越来越重要。
Freshwater organisms are increasingly exposed to elevated salinity in their habitats, presenting physiological challenges to homeostasis. Amphibians are particularly vulnerable to osmotic stress and yet are often subject to high salinity in a variety of inland and coastal environments around the world. Here, we examine the physiological responses to elevated salinity of rough-skinned newts (Taricha granulosa) inhabiting a coastal stream on the Pacific coast of North America and compare the physiological responses to salinity stress of newts living in close proximity to the ocean with those of newts living farther upstream. Although elevated salinity significantly affected the osmotic (body weight, plasma osmolality), stress (corticosterone), and immune (bactericidal ability) responses of newts, animals found closer to the ocean were generally less reactive to salt stress than those found farther upstream. Our results provide possible evidence for some physiological tolerance in this species to elevated salinity in coastal environments. As freshwater environments become increasingly saline and more stressful, understanding the physiological tolerances of vulnerable groups such as amphibians will become increasingly important to our understanding of their abilities to respond, to adapt, and, ultimately, to survive.