Competition for food between the Mediterranean shag, the great cormorant and artisanal fisheries: a case study
The Mediterranean shag (Phalacrocorax aristotelis desmarestii) and the great cormorant (P. carbo sinensis) are syntopic birds in an area encompassing Grosa Island and the Mar Menor coastal lagoon (SE Spain, western Mediterranean) during the breeding season of the former and the wintering period of t...
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| Format: | Article |
| Language: | English |
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Consejo Superior de Investigaciones Científicas
2018-03-01
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| Series: | Scientia Marina |
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| Online Access: | http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1745 |
| _version_ | 1818675553792688128 |
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| author | Felipe Aguado-Giménez Sergio Eguía-Martínez Irene Torres-Campos Santiago Meroño-García Jacinto Martínez-Ródenas |
| author_facet | Felipe Aguado-Giménez Sergio Eguía-Martínez Irene Torres-Campos Santiago Meroño-García Jacinto Martínez-Ródenas |
| author_sort | Felipe Aguado-Giménez |
| collection | DOAJ |
| description | The Mediterranean shag (Phalacrocorax aristotelis desmarestii) and the great cormorant (P. carbo sinensis) are syntopic birds in an area encompassing Grosa Island and the Mar Menor coastal lagoon (SE Spain, western Mediterranean) during the breeding season of the former and the wintering period of the latter. Diet composition of both birds was studied through pellet analysis and otolith identification. Competition for fish resources between these two seabirds and with local artisanal fisheries was assessed. Shags preyed preferentially on small pelagic fish, and great cormorants mainly consumed demersal fish. Shag diet consisted of marine fish strictly, but great cormorant fed in all the available environments in the study area, including marine, transitional (coastal lagoon) and freshwater reservoirs. The great dissimilarity observed between shag and great cormorant diet composition showed no competition between them. The low shag population density and fishing effort in their foraging area suggested no competition with fisheries. Conversely, great cormorant population density in the study area was very high, and they foraged on fish of high commercial value. However, competition between great cormorant and artisanal fisheries only affected some of the less abundant species fished. |
| first_indexed | 2024-12-17T08:29:25Z |
| format | Article |
| id | doaj.art-7c21191f26174eb2acd5cafd9ab61a62 |
| institution | Directory Open Access Journal |
| issn | 0214-8358 1886-8134 |
| language | English |
| last_indexed | 2024-12-17T08:29:25Z |
| publishDate | 2018-03-01 |
| publisher | Consejo Superior de Investigaciones Científicas |
| record_format | Article |
| series | Scientia Marina |
| spelling | doaj.art-7c21191f26174eb2acd5cafd9ab61a622022-12-21T21:56:39ZengConsejo Superior de Investigaciones CientíficasScientia Marina0214-83581886-81342018-03-0182171510.3989/scimar.04680.04B1711Competition for food between the Mediterranean shag, the great cormorant and artisanal fisheries: a case studyFelipe Aguado-Giménez0https://orcid.org/0000-0001-8931-6180Sergio Eguía-Martínez1https://orcid.org/0000-0003-3606-4949Irene Torres-Campos2https://orcid.org/0000-0002-7753-0590Santiago Meroño-García3https://orcid.org/0000-0002-1195-2432Jacinto Martínez-Ródenashttps://orcid.org/0000-0002-5469-7021Instituto Murciano de Investigación y Desarrollo Agrario y Alimentario (IMIDA)MENDIJOB S.L.Instituto Murciano de Investigación y Desarrollo Agrario y Alimentario (IMIDA)Instituto Murciano de Investigación y Desarrollo Agrario y Alimentario (IMIDA)The Mediterranean shag (Phalacrocorax aristotelis desmarestii) and the great cormorant (P. carbo sinensis) are syntopic birds in an area encompassing Grosa Island and the Mar Menor coastal lagoon (SE Spain, western Mediterranean) during the breeding season of the former and the wintering period of the latter. Diet composition of both birds was studied through pellet analysis and otolith identification. Competition for fish resources between these two seabirds and with local artisanal fisheries was assessed. Shags preyed preferentially on small pelagic fish, and great cormorants mainly consumed demersal fish. Shag diet consisted of marine fish strictly, but great cormorant fed in all the available environments in the study area, including marine, transitional (coastal lagoon) and freshwater reservoirs. The great dissimilarity observed between shag and great cormorant diet composition showed no competition between them. The low shag population density and fishing effort in their foraging area suggested no competition with fisheries. Conversely, great cormorant population density in the study area was very high, and they foraged on fish of high commercial value. However, competition between great cormorant and artisanal fisheries only affected some of the less abundant species fished.http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1745competitionfisheriesgreat cormorantotolithpredationshagsyntopy |
| spellingShingle | Felipe Aguado-Giménez Sergio Eguía-Martínez Irene Torres-Campos Santiago Meroño-García Jacinto Martínez-Ródenas Competition for food between the Mediterranean shag, the great cormorant and artisanal fisheries: a case study Scientia Marina competition fisheries great cormorant otolith predation shag syntopy |
| title | Competition for food between the Mediterranean shag, the great cormorant and artisanal fisheries: a case study |
| title_full | Competition for food between the Mediterranean shag, the great cormorant and artisanal fisheries: a case study |
| title_fullStr | Competition for food between the Mediterranean shag, the great cormorant and artisanal fisheries: a case study |
| title_full_unstemmed | Competition for food between the Mediterranean shag, the great cormorant and artisanal fisheries: a case study |
| title_short | Competition for food between the Mediterranean shag, the great cormorant and artisanal fisheries: a case study |
| title_sort | competition for food between the mediterranean shag the great cormorant and artisanal fisheries a case study |
| topic | competition fisheries great cormorant otolith predation shag syntopy |
| url | http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1745 |
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