Migración y ecología espacial de las poblaciones españolas de pardela cenicienta

Reyes‐González, José Manuel; Zajková, Zuzana; Morera‐Pujol, Virginia; Felipe, Fernanda De; Militão, Teresa; Dell’Ariccia, Gaia; Ramos, Raül; Igual, José Manuel; Arcos, José Manuel; González‐Solís, Jacob

doi:10.31170/0056

Cited by 7 publications

(8 citation statements)

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“…Cory’s Shearwater was also bycaught in high numbers and annual estimates represent ~80% of the Berlengas breeding population. The majority of individuals using this area are local breeders and prospectors (Paiva et al 2010, Catry et al 2011, Avalos et al 2017, Reyes-González et al 2017) and the small Berlengas population is estimated at around 800–975 breeding pairs (Oliveira et al 2020). Although bycatch rate may be overestimated due to variability within each season, the annual numbers should be viewed as rough estimates pointing towards a strong effect on the Cory’s Shearwater population breeding in the Berlengas archipelago.…”

Section: Discussionmentioning

confidence: 99%

A contribution to reducing bycatch in a high priority area for seabird conservation in Portugal

Oliveira¹,

Almeida²,

Alonso³

et al. 2020

Bird Conservation International

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Summary Bycatch is one of the main threats to marine biodiversity, affecting ocean ecosystems at a worldwide scale. The main focus of bycatch studies has been on the impact of larger vessels, with few studies assessing the impact of artisanal fisheries. Moreover, bycatch studies are often limited to a small number of marine regions, and significant gaps still exist in our knowledge of the spatial and temporal patterns of seabird bycatch. Here we present a multi-approach method to accurately quantify seabird bycatch driven by small- and medium-sized fishing fleets operating in a high priority area for seabird conservation on the Portuguese mainland. Results of three mitigation measures to reduce seabird bycatch on fishing gear where seabird bycatch is most likely to occur were also tested: high contrast panels in bottom gillnets, black hooks in demersal longlines and a bird scaring device in purse seines. The efficacy, acceptance, and economic viability were tested for each mitigation measure. Sixty-seven individuals of seven seabird species were bycaught during 295 monitored fishing trips between 2015 and 2018. Bycatch occurred mainly in demersal longlines (0.07 birds fishing event-1), followed by purse seines (0.02 birds fishing event-1) and bottom gillnets (0.01 birds fishing event-1). Nevertheless, the bird scaring device caused birds to interact less with the vessel (the presence of gulls was reduced by 11%), thus decreasing the likelihood of bycatch. This device has proved to be low-cost (representing less than 5% income of a single day’s landings) and easy to implement, being also well accepted by purse seine fishermen. It was not possible to evaluate the efficacy of high contrast panels and black hooks, as no bycatch events were recorded during trials.

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Section: Discussionmentioning

confidence: 99%

A contribution to reducing bycatch in a high priority area for seabird conservation in Portugal

Oliveira¹,

Almeida²,

Alonso³

et al. 2020

Bird Conservation International

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“…Sandwich tern and Audouin’s gull eggs were measured at the Ebro Delta while eggs of Scopoli’s shearwaters were measured about 170km east, at Dragonera Island (Balearic archipelago; Fig 1 ). Previous studies based on observations and direct tracking of marked individuals indicate that adults of the three species forage actively within the Ebro Delta continental shelf [ 27 , 28 ]; thus, we considered the continental shelf of a marine area of 100km radius centred on the Ebro Delta as representative of their common foraging area ( Fig 1 ). The three species mostly winter off the Atlantic coasts of Africa [ 27 , 28 ], but gulls are partial migrants and part of their population remains along the Western Mediterranean coast [ 27 ].…”

Section: Methodsmentioning

confidence: 99%

“…Previous studies based on observations and direct tracking of marked individuals indicate that adults of the three species forage actively within the Ebro Delta continental shelf [ 27 , 28 ]; thus, we considered the continental shelf of a marine area of 100km radius centred on the Ebro Delta as representative of their common foraging area ( Fig 1 ). The three species mostly winter off the Atlantic coasts of Africa [ 27 , 28 ], but gulls are partial migrants and part of their population remains along the Western Mediterranean coast [ 27 ]. For each species, we recorded the temporal variance of the annual mean volume of the modal clutch (hereafter, egg volume; N = 10573 clutches in total) as an indicator of the metabolic resources accumulated for breeding [ 31 , 32 ].…”

Section: Methodsmentioning

confidence: 99%

“…Furthermore, terns and gulls can modulate clutch size depending on environmental conditions, whereas shearwaters lay a single egg. Despite these differences, foraging areas of the three species overlap both during the breeding [ 24 – 26 ] and wintering seasons [ 27 , 28 ], in particular along the western coasts of Africa (Figs 1 and 2 ). Like most avian species, these seabirds can regulate breeding investment by adjusting egg number (terns and gulls) and size [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

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It’s not all abundance: Detectability and accessibility of food also explain breeding investment in long-lived marine animals

Real

Orol

Bertolero³

et al. 2022

PLoS ONE

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Large-scale climatic indices are extensively used as predictors of ecological processes, but the mechanisms and the spatio-temporal scales at which climatic indices influence these processes are often speculative. Here, we use long-term data to evaluate how a measure of individual breeding investment (the egg volume) of three long-lived and long-distance-migrating seabirds is influenced by i) a large-scale climatic index (the North Atlantic Oscillation) and ii) local-scale variables (food abundance, foraging conditions, and competition). Winter values of the North Atlantic Oscillation did not correlate with local-scale variables measured in spring, but surprisingly, both had a high predictive power of the temporal variability of the egg volume in the three study species, even though they have different life-history strategies. The importance of the winter North Atlantic Oscillation suggests carry-over effects of winter conditions on subsequent breeding investment. Interestingly, the most important local-scale variables measured in spring were associated with food detectability (foraging conditions) and the factors influencing its accessibility (foraging conditions and competition by density-dependence). Large-scale climatic indices may work better as predictors of foraging conditions when organisms perform long distance migrations, while local-scale variables are more appropriate when foraging areas are more restricted (e.g. during the breeding season). Contrary to what is commonly assumed, food abundance does not directly translate into food intake and its detectability and accessibility should be considered in the study of food-related ecological processes.

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“…Compared to the Western Mediterranean Scopoli's shearwater populations, whose non-breeding oceanic areas are well known (De Felipe et al, 2019;González-Solís et al, 2007;Péron and Grémillet, 2013;Reyes-González et al, 2017), information for the Central Mediterranean populations is scanty (Grémillet et al, 2014;Müller et al, 2014;Ramos, 2019). Hence, we first assessed the breeding and non-breeding ranges of the three study populations by means of GPS-tracking and light-level geolocators (GLS).…”

Section: Introductionmentioning

confidence: 99%

Year-round variation in the isotopic niche of Scopoli's shearwater (Calonectris diomedea) breeding in contrasting sea regions of the Mediterranean Sea

Campioni

Dell’Omo

Vizzini

et al. 2022

Marine Environmental Research

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Migración y ecología espacial de las poblaciones españolas de pardela cenicienta

Cited by 7 publications

References 0 publications

A contribution to reducing bycatch in a high priority area for seabird conservation in Portugal

A contribution to reducing bycatch in a high priority area for seabird conservation in Portugal

It’s not all abundance: Detectability and accessibility of food also explain breeding investment in long-lived marine animals

Year-round variation in the isotopic niche of Scopoli's shearwater (Calonectris diomedea) breeding in contrasting sea regions of the Mediterranean Sea

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