Anthropogenic food resources, sardine decline and environmental conditions have triggered a dietary shift of an opportunistic seabird over the last 30 years on the northwest coast of Spain

  title={Anthropogenic food resources, sardine decline and environmental conditions have triggered a dietary shift of an opportunistic seabird over the last 30 years on the northwest coast of Spain},
  author={Joana G. Calado and V{\'i}tor H. Paiva and Jaime A. Ramos and Alberto Velando and Ignacio Munilla},
  journal={Regional Environmental Change},
Human activities and environmental conditions are the main drivers of ecosystem change. One major alteration near the western Iberian coast has been the collapse of the Atlanto-Iberian sardine Sardina pilchardus stock, with important cascading effects on marine top predators. We investigated the effect of long-term changes in fishery landings, sardine availability and environmental conditions on the diet of the yellow-legged gull Larus michahellis in the northwest coast of Spain, over the last… 

Which trophic discrimination factors fit the best? A combined dietary study of a coastal seabird

It is found that cormorants fed on rather mobile fish of a fairly variable ecological spectrum, both benthic and pelagic, and showed low prey diversity, which coincides with the overall generalist and opportunistic piscivorous habit found at different coastal areas along its broad distribution range.

Amino Acid δ15N Can Detect Diet Effects on Pollution Risks for Yellow-Legged Gulls Overlooked by Trophic Position

The use of top-consumers as bioindicators of the health of food webs is hampered by uncertainties in their effective use of resources. In this study, the abundance of stable nitrogen isotopes in



Climate change and abundance of the Atlantic-Iberian sardine (Sardina pilchardus)

Climatic warming is affecting oceanic circulation patterns in coastal upwelling areas, but the impact of this climatic change on pelagic fish populations remains unclear. From juvenile landings

The role of sardine as prey for pelagic predators in the western Mediterranean Sea assessed using stable isotopes and fatty acids

There is little evidence for a wasp-waist structure based on sardine, which may explain why the populations of predators fluctuate less than the population of sardines.

Trophic ecology of pelagic fish species off the Iberian coast: diet overlap, cannibalism and intraguild predation

: This work presents, for the first time, a comparative study of the feeding ecology of the most abundant pelagic fish (PF) species (sardines, anchovies, chub mackerel, horse mackerel, bogue, jack

Changes in the abundance and spatial distribution of the Atlantic chub mackerel ( Scomber colias ) in the pelagic ecosystem and fisheries off Portugal

This study describes changes in abundance and spatial distribution of Atlantic chub mackerel in the Portuguese waters and the Spanish waters of the Gulf of Cadiz using data from acoustic surveys from

Feeding ecology of the common dolphin (Delphinus delphis) in Western Iberian waters: has the decline in sardine (Sardina pilchardus) affected dolphin diet?

The results confirm the previously reported preference for energy-rich prey, especially sardine, suggesting that common dolphins in Portuguese waters specialise in feeding on this species.

Effects of environmental variability on different trophic levels of the North Atlantic food web

From 2005 to 2010 the influence of climate (as driven by the North Atlantic Oscillation phenomenon) was directly measured on marine productivity, fish prey abundances and the foraging behaviour of a top marine predator, the Cory's shearwater.

Temporal and spatial variation in the diet of a marine top predator—links with commercial fisheries

The results indicate that great skuas rely heavily on fishery discards and are also sensitive to spatial and temporal changes in fisheries activity.

Stock dynamic of the Iberian sardine ( Sardina pilchardus , W.) and its implication on the fishery off Galicia (NW Spain)

The dynamics of this stock in the context of a metapopulation is analyzed, taking the influence of the dynamics of each sub-population and the environmental conditions that might affect the success of the recruitment.

Effect of climate on recruitment success of Atlantic Iberian sardine Sardina pilchardus

The aim of this study was to determine how climatic (North Atlantic Oscillation winter index, NAO, December through March), oceanographic (upwelling intensity, turbulence, water col- umn stability