首页> 外文期刊>Polar biology >Occurrence of dusky dolphin lagenorhynchus obscurus in Tierra Del Fuego archipelago over five decades
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Occurrence of dusky dolphin lagenorhynchus obscurus in Tierra Del Fuego archipelago over five decades

机译:五十年来在火地岛群岛上出现了暗淡的海豚lagenorhynchus obscurus

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摘要

Dusky dolphins Lagenorhynchus obscurus are distributed in circumpolar temperate and cold temperate waters of the Southern hemisphere. In Tierra del Fuego, their presence had been considered occasional but in the last decade, they became very common along the Beagle Channel. Here, we evaluate the occurrence of dusky dolphins in Tierra del Fuego along 44 years. We also discuss the relationship of this population with their distribution in southern South America. We used three different datasets: sightings hosted in the Ocean Biogeographic Information System OBIS, incidental sightings, and shipboard sighting surveys. A total of 44 sightings of dusky dolphins in Tierra del Fuego were obtained from the three datasets from 1972 to 2016. Most individuals were recorded in the southern area of the Fuegian Archipelago. Between the 1970s and 90s their occurrence in the Beagle Channel was infrequent up to the year 2000. From 2009 to date, they were recorded each year in the Argentinean Beagle Channel waters during austral summer and fall months, suggesting at least, a seasonal resident population. Our results preclude assessing if the observed groups of dolphins in the southern portion of South America came originally from the Atlantic or Pacific Oceans populations. Molecular and spatial ecology studies (e.g., using satellite tags) could help to better understand which lineage they belong to and their spatio-temporal movements in the area.
机译:暗淡的海豚Lagenorhynchus obscurus分布在南半球的极地温带和冷温带水域。在火地岛(Tierra del Fuego),他们偶尔会出现,但在最近十年中,它们在比格海峡沿岸变得非常普遍。在这里,我们评估了44年以来在火地岛中黄昏海豚的发生。我们还讨论了该人口与其在南美洲南部的分布之间的关系。我们使用了三个不同的数据集:海洋生物地理信息系统OBIS中托管的观测,偶然观测和船上观测调查。从1972年至2016年的三个数据集中,共发现了火地岛Tierra del Fuego的44只海豚,其中大部分是在福吉群岛南部地区记录的。在1970年代至90年代之间,直到2000年,它们很少在比格海峡发生。从2009年至今,每年在夏季和秋季的几个月里,阿根廷比格海峡的水域每年都记录到它们,这表明至少有一个季节性居民。 。我们的结果排除了评估南美洲南部观察到的海豚群是否最初来自大西洋或太平洋种群的可能性。分子和空间生态学研究(例如,使用卫星标签)可能有助于更好地了解它们所属的血统以及该地区的时空运动。

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  • 来源
    《Polar biology》 |2018年第9期|1895-1900|共6页
  • 作者单位

    Laboratorio de Ecología y Conservación de Vida Silvestre CADIC-CONICET,Museo Acatushún de Aves y Mamíferos Marinos Australes;

    Laboratorio de Ecología y Conservación de Vida Silvestre CADIC-CONICET,Museo Acatushún de Aves y Mamíferos Marinos Australes;

    Laboratorio de Ecología y Conservación de Vida Silvestre CADIC-CONICET,Instituto de Ciencias Polares, Ambiente y Recursos Naturales, Universidad Nacional de Tierra del Fuego;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Lagenorhynchus obscurus; Distribution; Beagle Channel; Southern South America;

    机译:Lagenorhynchus obscurus;分布;Beagle Channel;南美南部;

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