Effects of Salinity on Hatchling Diamond-Backed Terrapin (Malaclemys terrapin) Growth, Behavior, and Stress Physiology.
Effects of Salinity on Hatchling Diamond-Backed Terrapin (Malaclemys terrapin) Growth, Behavior, and Stress Physiology.
复制标题
盐度对刚孵出的金刚龟生长、行为和应激生理的影响。
DOI：
10.1655/herpetologica-d-20-00028.1
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发表时间：
2021-03
期刊：
影响因子：
2.4
通讯作者：
Maerz JC
中科院分区：
文献类型：
--
作者：
Ashley EA;Davis AK;Terrell VK;Lake C;Carden C;Head L;Choe R;Maerz JC
钻石背水龟生活在北美东部和墨西哥湾沿岸的海岸盐沼中。水龟适应中等盐度，但经常面临海水淹没的沼泽栖息地超过25ppt(或克/公斤)。我们研究了盐度对孵化水龟生长的影响及其对盐度胁迫的补偿反应。我们随机将30只龟幼体分配到五个盐度处理(1、5、10、20或35ppt)之一。在75天的时间里，我们定期监测行为、食欲和生长的变化；并计算异嗜性细胞与淋巴细胞的比率(H：L比率)以评估对长期盐分胁迫的反应。与之前的研究一致，长期暴露在高盐度下显著降低了幼体的生长。在20ppt和35ppt盐度下孵化的幼鱼表现出食欲抑制和回避咸水，并更有可能表现出寻找淡水的行为。H：L比率在20ppt和35ppt盐度下孵化的幼体中较高，这与皮质酮驱动的对持续高盐度暴露的应激反应一致，这可能在限制生长方面发挥作用。我们的发现表明，根据栖息地盐度和淡水可获得性的不同，孵化后的幼体在当地生境中的生长和分布将在空间上有所不同。因此，长期高盐度或获取淡水有限的生长限制效应可能会增加幼体死亡率，并成为龟类人口统计和丰度空间差异的一个重要驱动因素。然而，当淡水资源可用时，补偿行为可能会减少限制生长的影响。由于海平面上升、人类用水量增加、土地开发和其他人为变化改变了对沿海沼泽的淡水输入，海龟的招募可能会受到影响。
Diamond-backed Terrapins inhabit coastal salt marshes along the eastern and Gulf coasts of North America. Terrapins are adapted to intermediate salinities yet frequently face saltwater-inundated marsh habitat exceeding 25 ppt (or grams/kilogram). We investigated the effect of salinity on the growth of hatchling terrapins and on their compensatory responses to salinity stress. We randomly assigned 30 terrapin hatchlings each to one of five salinity treatments (1, 5, 10, 20, or 35 ppt). Over 75 d, we regularly monitored behavior, appetite, and changes in growth; and calculated ratios of heterophils to lymphocytes (H:L ratio) to assess responses to prolonged salinity stress. Consistent with prior studies, chronic exposure to high salinity significantly reduced hatchling growth. Hatchlings in 20-ppt and 35-ppt salinities exhibited appetite suppression and saltwater avoidance and were more likely to show freshwater-seeking behaviors. H:L ratios were higher among hatchlings in 20-and 35-ppt salinities, consistent with a corticosterone-driven stress response to sustained high-salinity exposure, which may play a role in limiting growth. Our findings suggest hatchling growth and distribution among local habitats will vary spatially depending on habitat salinity and freshwater accessibility. The growth-limiting effects of chronically high salinity or limited access to freshwater could therefore increase hatchling mortality and be an important driver of spatial variation in terrapin demography and abundance. However, when freshwater sources are available, compensatory behaviors might reduce growth-limiting effects. Terrapin recruitment is likely to be impacted as rising sea levels, increased human water use, land development, and other anthropogenic changes alter freshwater inputs to coastal marshes.
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影响因子：
2.7
作者：
Cockrem, JF;Silverin, B
通讯作者：
Silverin, B
DOI：
10.1007/bf00782600
发表时间：
1981-01-01
期刊：
JOURNAL OF COMPARATIVE PHYSIOLOGY
影响因子：
--
作者：
COWAN, FBM
通讯作者：
COWAN, FBM
DOI：
10.1086/physzool.58.6.30156077
发表时间：
1985-11-01
期刊：
PHYSIOLOGICAL ZOOLOGY
影响因子：
--
作者：
DUNSON, WA
通讯作者：
DUNSON, WA
影响因子：
10
作者：
Agha, Mickey;Ennen, Joshua R.;Todd, Brian D.
通讯作者：
Todd, Brian D.
影响因子：
2.6
作者：
DUNSON, WA
通讯作者：
DUNSON, WA