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Some aspects of the breeding biology and demography of the double-crested cormorants (Phalacrocorax auritus) of Mandarte Island

Veen, H.E. van de (1973) Some aspects of the breeding biology and demography of the double-crested cormorants (Phalacrocorax auritus) of Mandarte Island. Master's Thesis / Essay, Biology.

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Abstract

This paper deals with the breeding biology and some aspects of the demography of Mandarte Island's DCC-population. A review of a selection from the literature on breeding of colonial seabirds is presented. Special attention is given to the question "which factors determine clutch-size in seabirds"? and results of experiments on artificially enlarged broods are briefly discussed. Data on survival from enlarged broods of Mandartes’ cormorants are summarized and compared with data from normal broods. Underlying information is mainly based on band reading from living birds. Detailed information and statistics on breeding in 1972 are presented. Age composition of the population, age at first breeding and mean span of adult life are calculated. The results from this study strongly indicate that, in the DCC-population studied, control of absolute recruitment would be exerted by first year mortality, whereas the age of first breeding, which is dependent of the age structure of the breeding population, controls the annual production of the population.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Biology
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 07:51
Last Modified: 15 Feb 2018 07:51
URI: http://fse.studenttheses.ub.rug.nl/id/eprint/10643

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