Temporal and spatial patterns in the abundance of wintering Red‐breasted MergansersMergus serratorin an estuary
作者:
HEINZ RICHNER,
期刊:
Ibis
(WILEY Available online 1988)
卷期:
Volume 130,
issue 1
页码: 73-78
ISSN:0019-1019
年代: 1988
DOI:10.1111/j.1474-919X.1988.tb00958.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
Tidal, temporal and spatial aspects in the abundance of wintering Red‐breasted Mergansers in the Ythan estuary, northeast Scotland, were investigated. The number and location of birds were examined in relation to four variables: tidal cycle and tidal range, and month and time of day. A significant increase in the numbers of this piscivorous bird occurred as the winter progressed. Numbers were highest in early morning and then decreased significantly during the day. Spring tides were favoured over neap tides and a significant increase in numbers was recorded between low tide and high tide. The lower part of the estuary was preferred over the upper part with no detectable shift in the preference occurring in relation to any of the four variable
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