Influence of predictable anthropogenic food subsides on seabird´s breeding investment
Recent policies on the ban of fishing discards and the closure of open-air landfills are expected to reduce amount of predictable anthropogenic food subsidies (PAFS) for seabirds. To forecast the ecological consequences of these policies, it is necessary to understand the influence that each of thes...
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Universitat de Barcelona
2019
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Online Access: | http://hdl.handle.net/10803/668552 |
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ftubarcelona:oai:www.tdx.cat:10803/668552 2023-12-24T10:23:19+01:00 Influence of predictable anthropogenic food subsides on seabird´s breeding investment Real Garcia, Enric Oro, Daniel Tavecchia, Giacomo Muñoz Gràcia, Isabel Universitat de Barcelona. Facultat de Biologia 2019-12-12 application/pdf 207 p. http://hdl.handle.net/10803/668552 eng eng Universitat de Barcelona http://hdl.handle.net/10803/668552 L'accés als continguts d'aquesta tesi queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons: http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess TDX (Tesis Doctorals en Xarxa) Ocells marins Aves marinas Sea birds Nutrició animal Nutrición animal Animal nutrition Reproducció Reproducción Reproduction Ciències Experimentals i Matemàtiques 504 info:eu-repo/semantics/doctoralThesis info:eu-repo/semantics/publishedVersion 2019 ftubarcelona 2023-11-30T06:33:42Z Recent policies on the ban of fishing discards and the closure of open-air landfills are expected to reduce amount of predictable anthropogenic food subsidies (PAFS) for seabirds. To forecast the ecological consequences of these policies, it is necessary to understand the influence that each of these resources has on ecological parameters and how this can be mediated by density-dependent mechanisms. Besides, for those species exploiting both types of resources, it is important to consider whether or not their effects act synergistically. Finally, it is also important to understand how the ecological interactions between seabirds and PAFS can be influenced by other potentially important environmental factors, such as for example, the abundance of natural prey or the one of foraging conditions. In the first chapter of this thesis, I reviewed the current knowledge on the ecological interactions between seabirds and fishery discards, with the aim of identifying the main knowledge gaps and to propose new challenges to improve our understanding of the ecological role of PAFS availability to seabirds. In the second chapter, I assessed the relative role of fishery discards and open-air landfills in the breeding investment of a generalist seabird, investigating the possible interplay with density-dependent mechanisms. In the third chapter I collaborated to investigate the role of PAFS in buffering environmental stochasticity and disrupting the natural synchronous dynamics between two seabirds. Finally, in the last chapter, I assessed the importance of several environmental factors in the breeding investment of three seabirds with contrasting life-history strategies. In particular, I considered local environmental variables (food abundance, competition and sea state) during breeding as well as the influence of winter conditions summarized by a large-scale climatic index, the North Atlantic Oscillation (NAO). Considering these variables simultaneously allowed me to assess the relative importance of natural and ... Doctoral or Postdoctoral Thesis North Atlantic North Atlantic oscillation Universitat de Barcelona: Theses and Dissertations Online (TDX) |
institution |
Open Polar |
collection |
Universitat de Barcelona: Theses and Dissertations Online (TDX) |
op_collection_id |
ftubarcelona |
language |
English |
topic |
Ocells marins Aves marinas Sea birds Nutrició animal Nutrición animal Animal nutrition Reproducció Reproducción Reproduction Ciències Experimentals i Matemàtiques 504 |
spellingShingle |
Ocells marins Aves marinas Sea birds Nutrició animal Nutrición animal Animal nutrition Reproducció Reproducción Reproduction Ciències Experimentals i Matemàtiques 504 Real Garcia, Enric Influence of predictable anthropogenic food subsides on seabird´s breeding investment |
topic_facet |
Ocells marins Aves marinas Sea birds Nutrició animal Nutrición animal Animal nutrition Reproducció Reproducción Reproduction Ciències Experimentals i Matemàtiques 504 |
description |
Recent policies on the ban of fishing discards and the closure of open-air landfills are expected to reduce amount of predictable anthropogenic food subsidies (PAFS) for seabirds. To forecast the ecological consequences of these policies, it is necessary to understand the influence that each of these resources has on ecological parameters and how this can be mediated by density-dependent mechanisms. Besides, for those species exploiting both types of resources, it is important to consider whether or not their effects act synergistically. Finally, it is also important to understand how the ecological interactions between seabirds and PAFS can be influenced by other potentially important environmental factors, such as for example, the abundance of natural prey or the one of foraging conditions. In the first chapter of this thesis, I reviewed the current knowledge on the ecological interactions between seabirds and fishery discards, with the aim of identifying the main knowledge gaps and to propose new challenges to improve our understanding of the ecological role of PAFS availability to seabirds. In the second chapter, I assessed the relative role of fishery discards and open-air landfills in the breeding investment of a generalist seabird, investigating the possible interplay with density-dependent mechanisms. In the third chapter I collaborated to investigate the role of PAFS in buffering environmental stochasticity and disrupting the natural synchronous dynamics between two seabirds. Finally, in the last chapter, I assessed the importance of several environmental factors in the breeding investment of three seabirds with contrasting life-history strategies. In particular, I considered local environmental variables (food abundance, competition and sea state) during breeding as well as the influence of winter conditions summarized by a large-scale climatic index, the North Atlantic Oscillation (NAO). Considering these variables simultaneously allowed me to assess the relative importance of natural and ... |
author2 |
Oro, Daniel Tavecchia, Giacomo Muñoz Gràcia, Isabel Universitat de Barcelona. Facultat de Biologia |
format |
Doctoral or Postdoctoral Thesis |
author |
Real Garcia, Enric |
author_facet |
Real Garcia, Enric |
author_sort |
Real Garcia, Enric |
title |
Influence of predictable anthropogenic food subsides on seabird´s breeding investment |
title_short |
Influence of predictable anthropogenic food subsides on seabird´s breeding investment |
title_full |
Influence of predictable anthropogenic food subsides on seabird´s breeding investment |
title_fullStr |
Influence of predictable anthropogenic food subsides on seabird´s breeding investment |
title_full_unstemmed |
Influence of predictable anthropogenic food subsides on seabird´s breeding investment |
title_sort |
influence of predictable anthropogenic food subsides on seabird´s breeding investment |
publisher |
Universitat de Barcelona |
publishDate |
2019 |
url |
http://hdl.handle.net/10803/668552 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
TDX (Tesis Doctorals en Xarxa) |
op_relation |
http://hdl.handle.net/10803/668552 |
op_rights |
L'accés als continguts d'aquesta tesi queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons: http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess |
_version_ |
1786197209409126400 |