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Universidade de Lisboa

1. Martins, Ricardo Jorge Pais da Costa. Wintering and migrating populations of dunlin calidris alpina using the tagus estuary : foraging ecology, behaviour and distribution.

Degree: 2015, Universidade de Lisboa

Tese de doutoramento, Biologia (Ecologia), Universidade de Lisboa, Faculdade de Ciências, 2015

Waders typically perform long-distance migrations between breeding and wintering areas, depending on a network of stopover sites to refuel along their flyway. Most wetlands act both as wintering and stopover areas for different wader populations and their distinct ecological constrains might lead them to different patterns of resource use, which is important information to plan conservation. The main aim of this thesis was to investigate the foraging ecology, behaviour and distribution of wintering and northward migrating dunlins Calidris alpina in the Tagus estuary, Portugal. These populations contrasted in diet, foraging behaviour and distribution. Differences in diet and foraging behaviour were explained by marked seasonal variations in prey availability. The improved feeding conditions for migrants presumably enabled high fattening rates, which highlight the good quality of the foraging habitats of the Tagus estuary for waders in stopover. In terms of distribution, unlike wintering dunlins, migrants avoided the areas of the estuary with higher perceived (but not real) risk of predation, despite their higher abundance of invertebrates. The distinct ecological constrains of these populations (e.g. in time and knowledge of the estuary) likely explains this pattern, as migrants are especially conservative in terms of predation risk when selecting foraging areas. In this thesis, the temporal overlap of wintering and migrating dunlins using the estuary in late winter/spring was investigated. This was done by determining departure dates of wintering birds, with radio-tracking, and through the innovative analysis of stable isotopes from toenails to unveil the wintering origins of birds using the estuary in migratory periods. This method confirmed the Banc d’Arguin, Mauritania, as the prime wintering area of birds that stopover at the Tagus estuary. To assist these studies, a new method to capture shorebirds was developed, where a crossbow is used to pull a mist-net over flocks of roosting birds.

Advisors/Committee Members: Palmeirim, Jorge M., 1957-, Granadeiro, José Pedro, 1964-.

Subjects/Keywords: Aves limícolas; Pilrito-comum; Aves migrantes; Comportamento alimentar; Isótopos estáveis; Estuário do Tejo; Teses de doutoramento - 2015; Domínio/Área Científica::Ciências Naturais::Ciências Biológicas

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Martins, R. J. P. d. C. (2015). Wintering and migrating populations of dunlin calidris alpina using the tagus estuary : foraging ecology, behaviour and distribution. (Thesis). Universidade de Lisboa. Retrieved from https://www.rcaap.pt/detail.jsp?id=oai:repositorio.ul.pt:10451/20607

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Martins, Ricardo Jorge Pais da Costa. “Wintering and migrating populations of dunlin calidris alpina using the tagus estuary : foraging ecology, behaviour and distribution.” 2015. Thesis, Universidade de Lisboa. Accessed August 09, 2020. https://www.rcaap.pt/detail.jsp?id=oai:repositorio.ul.pt:10451/20607.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Martins, Ricardo Jorge Pais da Costa. “Wintering and migrating populations of dunlin calidris alpina using the tagus estuary : foraging ecology, behaviour and distribution.” 2015. Web. 09 Aug 2020.

Vancouver:

Martins RJPdC. Wintering and migrating populations of dunlin calidris alpina using the tagus estuary : foraging ecology, behaviour and distribution. [Internet] [Thesis]. Universidade de Lisboa; 2015. [cited 2020 Aug 09]. Available from: https://www.rcaap.pt/detail.jsp?id=oai:repositorio.ul.pt:10451/20607.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Martins RJPdC. Wintering and migrating populations of dunlin calidris alpina using the tagus estuary : foraging ecology, behaviour and distribution. [Thesis]. Universidade de Lisboa; 2015. Available from: https://www.rcaap.pt/detail.jsp?id=oai:repositorio.ul.pt:10451/20607

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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