Variations in Reproduction Parameters of Black-headed Gulls ( Larus ridibundus ) Living in Different Conditions in the Czech and Slovak Republics
Significant differences in embryonic mortality and occurrence of structural developmental defects between three separated populations of the Black-headed Gull were examined. Growth retardation was not studied. Population ‘C’ (average 2.78 eggs per nest), living in Western Slovakia, exhibits in three...
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Cambridge University Press (CUP)
1993
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Online Access: | http://dx.doi.org/10.1017/s0376892900023559 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0376892900023559 |
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crcambridgeupr:10.1017/s0376892900023559 2024-03-03T08:49:26+00:00 Variations in Reproduction Parameters of Black-headed Gulls ( Larus ridibundus ) Living in Different Conditions in the Czech and Slovak Republics Guthová, Zuzana 1993 http://dx.doi.org/10.1017/s0376892900023559 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0376892900023559 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Environmental Conservation volume 20, issue 4, page 347-351 ISSN 0376-8929 1469-4387 Health, Toxicology and Mutagenesis Management, Monitoring, Policy and Law Nature and Landscape Conservation Pollution Water Science and Technology journal-article 1993 crcambridgeupr https://doi.org/10.1017/s0376892900023559 2024-02-08T08:33:41Z Significant differences in embryonic mortality and occurrence of structural developmental defects between three separated populations of the Black-headed Gull were examined. Growth retardation was not studied. Population ‘C’ (average 2.78 eggs per nest), living in Western Slovakia, exhibits in three-egg clutches relatively low mortality (7%) as well as a low occurrence of developmental defects (2.8%). In population ‘B’ (2.6 eggs per nest, living in Southern Moravia), breeding in a region that is intensively exploited for agriculture, the mortality is still very low (3%) but the proportion of malformed embryos increases to 15%. In population ‘A’ (2.6 eggs per nest, living in Southern Bohemia) the highest mortality was found (13%) but only 4.3% of embryos were malformed, though there was a broader spectrum of developmental defects. In this population the eggs were significantly smaller and had thinner shells. In all the populations which were examined, the mortality and occurrence of developmental defects were higher in one-egg clutches, which were more frequent in populations ‘B’ and ‘A’ than in ‘C’. Except for mercury, it does not seem that concentration of toxic substances in eggs could be responsible for the observed differences in reproductive success. An increase in embryonic mortality at locality ‘C’ is probably evoked by malnutrition in garbage specialists. Article in Journal/Newspaper Black-headed Gull Larus ridibundus Cambridge University Press Environmental Conservation 20 4 347 351 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
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language |
English |
topic |
Health, Toxicology and Mutagenesis Management, Monitoring, Policy and Law Nature and Landscape Conservation Pollution Water Science and Technology |
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Health, Toxicology and Mutagenesis Management, Monitoring, Policy and Law Nature and Landscape Conservation Pollution Water Science and Technology Guthová, Zuzana Variations in Reproduction Parameters of Black-headed Gulls ( Larus ridibundus ) Living in Different Conditions in the Czech and Slovak Republics |
topic_facet |
Health, Toxicology and Mutagenesis Management, Monitoring, Policy and Law Nature and Landscape Conservation Pollution Water Science and Technology |
description |
Significant differences in embryonic mortality and occurrence of structural developmental defects between three separated populations of the Black-headed Gull were examined. Growth retardation was not studied. Population ‘C’ (average 2.78 eggs per nest), living in Western Slovakia, exhibits in three-egg clutches relatively low mortality (7%) as well as a low occurrence of developmental defects (2.8%). In population ‘B’ (2.6 eggs per nest, living in Southern Moravia), breeding in a region that is intensively exploited for agriculture, the mortality is still very low (3%) but the proportion of malformed embryos increases to 15%. In population ‘A’ (2.6 eggs per nest, living in Southern Bohemia) the highest mortality was found (13%) but only 4.3% of embryos were malformed, though there was a broader spectrum of developmental defects. In this population the eggs were significantly smaller and had thinner shells. In all the populations which were examined, the mortality and occurrence of developmental defects were higher in one-egg clutches, which were more frequent in populations ‘B’ and ‘A’ than in ‘C’. Except for mercury, it does not seem that concentration of toxic substances in eggs could be responsible for the observed differences in reproductive success. An increase in embryonic mortality at locality ‘C’ is probably evoked by malnutrition in garbage specialists. |
format |
Article in Journal/Newspaper |
author |
Guthová, Zuzana |
author_facet |
Guthová, Zuzana |
author_sort |
Guthová, Zuzana |
title |
Variations in Reproduction Parameters of Black-headed Gulls ( Larus ridibundus ) Living in Different Conditions in the Czech and Slovak Republics |
title_short |
Variations in Reproduction Parameters of Black-headed Gulls ( Larus ridibundus ) Living in Different Conditions in the Czech and Slovak Republics |
title_full |
Variations in Reproduction Parameters of Black-headed Gulls ( Larus ridibundus ) Living in Different Conditions in the Czech and Slovak Republics |
title_fullStr |
Variations in Reproduction Parameters of Black-headed Gulls ( Larus ridibundus ) Living in Different Conditions in the Czech and Slovak Republics |
title_full_unstemmed |
Variations in Reproduction Parameters of Black-headed Gulls ( Larus ridibundus ) Living in Different Conditions in the Czech and Slovak Republics |
title_sort |
variations in reproduction parameters of black-headed gulls ( larus ridibundus ) living in different conditions in the czech and slovak republics |
publisher |
Cambridge University Press (CUP) |
publishDate |
1993 |
url |
http://dx.doi.org/10.1017/s0376892900023559 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0376892900023559 |
genre |
Black-headed Gull Larus ridibundus |
genre_facet |
Black-headed Gull Larus ridibundus |
op_source |
Environmental Conservation volume 20, issue 4, page 347-351 ISSN 0376-8929 1469-4387 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0376892900023559 |
container_title |
Environmental Conservation |
container_volume |
20 |
container_issue |
4 |
container_start_page |
347 |
op_container_end_page |
351 |
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1792506654967726080 |