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首页> 外文期刊>The Journal of Cetacean Research and Management >Trends in bottlenose dolphin (Tursiops truncatus) strandings in South Carolina, USA, 1997-2003: implications for the Southern North Carolina and South Carolina Management Units
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Trends in bottlenose dolphin (Tursiops truncatus) strandings in South Carolina, USA, 1997-2003: implications for the Southern North Carolina and South Carolina Management Units

机译：美国南卡罗来纳州的宽吻海豚（Tursiops truncatus）搁浅趋势，1997-2003年：对北卡罗来纳州南部和南卡罗来纳州管理部门的影响

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摘要

Trends in marine mammal stranding rates over multiple years can provide useful information on life history parameters, seasonal and spatial distribution and both natural and human-induced mortality rates when compared with baseline data. Data of bottlenose dolphin (Tursiops truncatus) stranding rates in South Carolina, USA from 1997-2003 were analysed. The objectives of this study were to: (1) compare recent trends in strandings with baseline data (1992-1996) for South Carolina; (2) compare strandings between the Southern North Carolina Management Unit (SNCMU) and the South Carolina Management Unit (SCMU); (3) determine annual, seasonal and spatial trends in bottlenose dolphin strandings; (4) investigate seasonal reproductive trends; and (5) determine the extent to which humans may affect stranding rates (human interactions). Bottlenose dolphins stranded in South Carolina are assumed to be from at least two of the seven management units recognised by the National Marine Fisheries Service in the Western North Atlantic: the SNCMU and the SCMU. During the study period, 302 bottlenose dolphin strandings were reported in South Carolina and stranding counts were analysed using a Generalised Linear Model. Results showed that there were significantly more bottlenose dolphin strandings in the spring and autumn as compared with summer and winter. The effect of season was highly significant for the number of neonate strandings, suggesting a bimodal reproductive cycle in spring and autumn for the study area. A significant increase in the number of strandings of all age classes was found in the autumn for the northern portion of the State (SNCMU), supporting the assumption that bottlenose dolphins from the north migrate into South Carolina waters during this time of year. Rope entanglements was the most common source of human interaction, with the crab pot fishery the most prevalent source of fishery mortality in South Carolina. This study demonstrates the usefulness of a long-term stranding database by increasing knowledge of temporal and spatial patterns and for monitoring neonate and human-induced mortality.
机译：与基线数据相比，多年来海洋哺乳动物搁浅率的趋势可以提供有关生命史参数，季节和空间分布以及自然和人为死亡率的有用信息。分析了1997-2003年美国南卡罗来纳州的宽吻海豚（Tursiops truncatus）搁浅率的数据。这项研究的目的是：（1）比较南卡罗来纳州绞股的最新趋势与基线数据（1992-1996年）; （2）比较北卡罗莱纳州南部管理部门（SNCMU）和南卡罗莱纳州管理部门（SCMU）之间的分歧; （3）确定宽吻海豚搁浅的年度，季节性和空间趋势; （4）调查季节性繁殖趋势; （5）确定人类可能在多大程度上影响搁浅率（人类互动）。假设滞留在南卡罗来纳州的宽吻海豚来自西北大西洋国家海洋渔业局认可的七个管理单位中的至少两个：SNCMU和SCMU。在研究期间，南卡罗来纳州报告了302条宽吻海豚搁浅，并使用广义线性模型对搁浅计数进行了分析。结果表明，与夏季和冬季相比，春季和秋季的宽吻海豚搁浅明显更多。季节的影响对于新生儿绞股的数量非常重要，这表明研究区域春季和秋季的双峰生殖周期。秋季在州北部（SNCMU）发现所有年龄段的搁浅数量均显着增加，这支持了这样的假设，即北方的宽吻海豚在一年的这个时候迁移到南卡罗来纳州的水域。绳索纠缠是人类互动的最普遍来源，蟹罐渔业是南卡罗来纳州最普遍的渔业死亡率来源。这项研究通过增加对时间和空间模式的了解以及监测新生儿和人为导致的死亡率，证明了长期搁浅数据库的有用性。

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