Pronounced long-term trends in year-round diet composition of the European shag Phalacrocorax aristotelis
Populations of marine top predators are exhibiting pronounced demographic changes due to alterations in prey availability and quality. Changes in diet composition is a key potential mechanism whereby alterations in prey availability can affect predator demography. Studies of long-term trends in diet have focused on the breeding season. However, long-term changes in non-breeding season diet is an important knowledge gap, since this is generally the most critical period of the year for the demography of marine top predators. In this study, we analysed 495,239 otoliths from 5888 regurgitated pellets collected throughout the annual cycle over three decades (1985–2014) from European shags Phalacrocorax aristotelis on the Isle of May, Scotland (56°11′N, 02°33′W). We identified dramatic reductions in the frequency of lesser sandeel Ammodytes marinus occurrence over the study, which was more pronounced during the non-breeding period (96% in 1988 to 45% in 2014), than the breeding period (91–67%). The relative numerical abundance of sandeel per pellet also reduced markedly (100–13% of all otoliths), with similar trends apparent during breeding and non-breeding periods. In contrast, the frequencies of Gadidae, Cottidae, Pleuronectidae and Gobiidae all increased, resulting in a doubling in annual prey richness from 6 prey types per year in 1988 to 12 in 2014. Our study demonstrates that the declining importance of the previously most prominent prey and marked increase in diet diversity is apparent throughout the annual cycle, suggesting that substantial temporal changes in prey populations have occurred, which may have important implications for seabird population dynamics.
We thank the many people who helped with fieldwork and lab work over the last three decades, in particular Jenny Bull, Linda Wilson and Carrie Gunn; we also thank Sam Tomlinson and Edward Carnell for help with manipulation of the data. We thank two anonymous referees for comments on an earlier version of the manuscript. We thank Scottish Natural Heritage (SNH) for access to the Isle of May National Nature Reserve. The work was conducted under research licences from Scottish Natural Heritage.
This study was funded by the Natural Environment Research Council (NERC; Adapting to the Challenges of a Changing Environment Doctoral Training Partnership, NERC National Capability, NERC/Department for Environment, Food and Rural Affairs Marine Ecosystems Research Programme Ref NE/L003082/1) and Joint Nature Conservation Committee (JNCC).
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Conflict of interest
The authors declare that they have no conflict of interest.
Research involving human participants and animals
This article does not contain any studies with animals performed by any of the authors.
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