Observations on the Grey Seal (Halichoerus grypus) at Ramsey Island, Pembrokeshire.
Observations on the Grey Seal (Halichoerus grypus) at Ramsey Island, Pembrokeshire.
复制标题
对彭布罗克郡拉姆齐岛灰海豹（Halichoerus grypus）的观察。
DOI：
10.1111/j.1096-3642.1949.tb00896.x
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
J. Davies.
中科院分区：
文献类型：
--
作者：
J. Davies.
摘要
1947年秋天，在拉姆齐岛对灰海豹的繁殖群进行了研究。讨论了两种性别在繁殖地的到来，以及它们在小牛出生前的行为。本文概述了海滩犊牛的历史，并讨论了犊牛产犊率、性比和婴儿死亡率。未成熟和非繁殖人口的运动处理，并给出了描述的毛皮颜色和年龄和性别的区别。试图阐明人口动态和物种在南威尔士州的地位。据推测，拉姆齐海豹是传统的洞穴繁殖者，开放的海滩繁殖是最近的习惯。最后，拉姆齐海豹和苏格兰殖民地的发展和行为之间的比较。结果表明，在拉姆齐的成年人是较少依赖于土地和年轻人一般更早熟。
Summary.
A brdding colony of the grey seal was studied in the autumn of 1947 at Ramsey Island. The arrival of both sexes at the breeding grounds is discussed and also their behaviour prior to the birth of the calves. The history of the calf while on the beach is summarized, and calving rate, sex ratio and infant mortality are discussed. The movements of the immature and non-breeding population are dealt with, and a description is given of the fur colour and age and sex distinctions. An attempt is made to elucidate population dynamics and the status of the species in South Wales. It is postulated that the Ramsey seals are traditionally cave-breeders and that open beach breeding is a recent habit. Finally a comparison is made between the development and behaviour of Ramsey seals and those of Scottish colonies. It is shown that at Ramsey the adults are less dependent on land and the young are generally more precocious.