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Global distribution of Risso's dolphin Grampus griseus: a review and critical evaluation

机译：Risso的海豚Grampus griseus的全球分布：回顾和重要评估

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摘要

The global range of Risso's dolphin Grampus griseus is not well known, and there has been confusion in the literature as to whether the species has a broad, circumglobal range or only occurs along continental margins. To clarify the species' distribution and habitat preferences, we compiled and reviewed all available (published and unpublished) records of sightings and captures of this species for the past 62 years (1950-2012, n=8068 records). Stranding records were not included. The results showed that the species has a range that extends across ocean basins and spans between at least 64 degrees N and 46 degrees S, and is apparently absent from high-latitude polar waters. Although Risso's dolphins occur in all habitats from coastal to oceanic, they show a strong range-wide preference for mid-temperate waters of the continental shelf and slope between 30 degrees and 45 degrees latitude. Although a number of misconceptions about the distributional ecology of Risso's dolphin have existed, this analysis showed that it is a widespread species. It strongly favours temperate waters and prefers continental shelf and slope waters to oceanic depths. These habitat preferences appear to hold throughout much or all of the species' range.
机译：Risso的海豚Grampus griseus的全球范围尚不为人所知，关于该物种是否具有宽广的周遭范围或仅沿大陆边缘发生，文献上一直存在混淆。为了弄清该物种的分布和栖息地偏好，我们汇编并审查了过去62年（1950-2012，n = 8068记录）的所有有关该物种的目击和捕获的可用（已公开和未公开）记录。不包括搁浅记录。结果表明，该物种的范围跨大洋盆地，跨度至少在北纬64度到南纬46度之间，并且显然不在高纬度极地水域中。尽管Risso的海豚遍布从沿海到海洋的所有栖息地，但它们在整个范围内都表现出强烈的偏爱大陆架和坡度在30度至45度之间的中温水域。尽管对里索海豚的分布生态学存在许多误解，但这项分析表明，它是一种分布广泛的物种。它强烈偏爱温带水域，偏爱大陆架和斜坡水域而不是海洋深度。这些栖息地的喜好似乎在整个物种的大部分或全部范围内都存在。

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