BUSCADOR RECOLECTA

Non-breeding locations of Cory’s shearwaters (Calonectris borealis), Scopoli’s shearwaters (C. diomedea), and Cabo Verde shearwaters (C. edwardsii) tracked from the colonies of Berlenga, Chafarinas, Corvo, Faial, Graciosa, Montaña Clara, Pico, Selvagem, Sisargas, Terreros, Timanfaya, Veneguera, and Vila for Cory’s shearwaters; Cala Morell, Chafarinas, Filfla, Frioul, Giraglia, Gozo, Lavezzi, Linosa, Malta, Na Foradada, Na Pobra, Palomas, Pantaleu, Paximada, Porquerolles, Riou, Strofades, Tremiti, and Zembra for Scopoli’s shearwaters; and Curral Velho and Raso for Cabo Verde’s shearwaters. Animals were tracked between the years of 2006 and 2016, and data includes species, colony, unique identifiers for each bird and trip, latitude, longitude, year of tracking (1st year, 2nd year, etc.), and an ordering column that allows the positions to be ordered to form a track.

We evaluated the degree of sexual segregation (SS) in the feeding ecology, in the choice of main non-breeding areas, in behaviour and in migratory phenology of three closely related shearwaters: Scopoli’s, Cory’s and Cape Verde shearwaters (Calonectris diomedea, C. borealis and C. edwardsii, respectively) during the non-breeding period in relation to the conditions of their different life strategies. The main objective of the study is to better understand the ecological and evolutionary role of sex on the spatial, behavioural and feeding ecology of birds during the non-breeding period, since most studies on birds have focused on the breeding period. The referred issues were addressed through a multidisciplinary approach combining geolocation and stable isotope data.

Datasets supporting the results of the article “The importance of including survival release costs when assessing viability in reptile translocations”. The readme files contain information about each data column. Questions should be addressed to Albert Bertolero (albert.bertolero@gmail.com)., Translocations to restore populations of endangered species are an important conservation tool, but a reliable diagnosis is needed to assess their success. We used capture-recapture modeling to analyze the adult apparent survival of released and resident tortoises in two translocation projects in Spain monitored for 14 and 29 years. We tested if long-term survival rates differ between released and resident individuals, if survival was lower during the phase of establishment (i.e. release cost), how long acclimation lasts and if increased density due to releases affects survival. We found lower survival of released tortoises during the phase of establishment (1 to 3 years) when residents were already present. After establishment, survival was very high and unaffected by density-dependence. Body condition before release was similar between recaptured and dead/missing tortoises, and did not predict establishment survival. Stochastic population viability analysis showed that success when releasing small numbers of individuals strongly depends upon adult long-term survival. Release of small second batches of tortoises was not sensitive to a growing population, regardless of its release timing. Our results highlight long-term survival as crucial in translocation projects of long-lived species, invalidating short-term (first year) survival assessment, when survival release cost does not match long-term survival. A release cost of different duration should be included in model estimation before modeling predictions. Releasing tortoises (for welfare of captive individuals or for mitigating human negative impacts) in an already established population is not recommended under most circumstances. Acclimation cost is followed by survival approaching wild counterparts. If this milestone is not achieved, the project needs to be carefully assessed to adopt other management options or should be stopped altogether., Field work in the Ebro Delta and Minorca was partially funded by the Ebro Delta Natural Park, the Generalitat de Catalunya, the Institut Menorquí d'Estudis (IME), the Consell Insular de Menorca and the Spanish Ministry of Science and Technology (CICYT CGL2004-0473/BOS)., Peer reviewed

CMR dataset for Spanish Shags from Galicia and Asturias, CMR individual data, Peer reviewed

This dataset was used to analyze survival probabilities of adult Audouin’s gull depending on early conditions (density-dependence and Winter NAO) experienced by the individuals., Capture mark recapture data of Audouin gulls breeding from 1995 until 2009 in Mediterranean locations including Ebro Delta, Chafarinas Islands, Columbretes Islands and Mallorca islets in the Balearic Islands. Individuals are shown in rows and years in columns followed by the cohort on which they were born, and the environmental covariates associated to that year. This data set has been used for the publication: Payo-Payo, A.; Sanz-Aguilar, A. and Oro, D. (2022) Long-lasting effects of harsh early-life conditions on adult survival of a long-lived vertebrate. OIKOS., We acknowledge financial support through projects RESET (CGL2017-85210-P), IBISES (ref. CGL2013-42203-R) and MINOW (ref. H2020- 634495)., This work was funded through projects RESET (CGL2017-85210-P) and IBISES (ref. CGL2013-42203-R). APP was supported by a predoctoral fellowship of the Ministry of Education (FPU-AP 2012-0869). ASA is supported by a postdoctoral contract co-funded by the Regional Government of the Balearic Islands and the European Social Fund (ref. PD/003/2016) and a Ramón y Cajal fellowship ( Ref. RYC-2017- 22796)., The data file contains resight histories of Audouin’s gulls born at Ebro Delta and observed during breeding seasons 1995 to 2009. This file contains one line per individual; one column per encounter occasion (from column 1 to 15 were code 1 indicate resight at Ebro Delta colony and code 2 resight at other colony); one line indicating the number of individual capture histories (column 16); and three further columns indicating the standardized values of early life individual covariates (columns 17, 18, and 19; for DD, WNAO, and DD*WNAO, respectively)., No

Disentangling the influence of demographic parameters and the role of density dependence on species’ population dynamics may be challenging, especially when there are fractions of the population that are unobservable (e.g. dispersers, non-breeders). Additionally, due to the difficulty of gathering data at large spatial scales, most studies ignore the global dynamic of a species, which would integrate heterogeneity in local dynamics and remove the noise of dispersal. We developed a global scale, integrated population model (IPM), to disentangle the main demographic drivers of population dynamics in a long-lived colonial seabird. We used 28 years of Audouin’s gull demographic data encompassing 69 local patches (90% of the world population). Importantly, we took into account the unobservable fraction of non-breeders and also assessed the strength of density dependence for this fraction of the population. As predicted by life histories of long-lived organisms, temporal random variation in survival was highest for immatures (), and lowest for adults (). Large temporal fluctuations in the probability of taking a sabbatical from reproduction would partly explain constancy in adult survival, adults probably refraining from breeding when environmental conditions were harsh. Thus, skipping breeding would be a bet hedging strategy for long-lived organisms having many reproductive chances during their lifespan. Immature survival and fertility were the main drivers of population dynamics during the study period (r2= 0.83 (0.77-0.87) and 0.73 (0.63-0.79) respectively). We found strong evidence of density dependence, not only due to the number of breeders (r2= -0.34 (-0.43 -0.24)) but also to that of sabbaticals (r2= -0.18 (-0.33 -0.01)). Even though population dynamics of long-lived organisms are very sensitive to changes in adult survival, we show here that in the absence of strong environmental perturbations affecting this life history trait, fluctuations in population density in those species may be driven by variations of immature survival and fertility. The species is showing a 5% of annual global decrease during the last ten years, and we propose an updated species conservation status. Integrated models based on long term monitoring at a global scale may enhance our ecological and evolutionary understanding of how demographic drivers influence population dynamics., No

Peer reviewed

Hibernation has been selected for increasing survival in harsh climatic environments. Seasonal variability in temperature may push body temperature of hibernating animals across boundaries of alternative states between euthermic temperature and torpor temperature, typical of either hibernation or summer dormancy. Nowadays, wearable electronics open a promising avenue to analyse the dynamics of criticality of physiological systems, such as body temperature fluctuating between activity and hibernation. We deployed temperature loggers to two hibernating edible dormice during a whole year under Mediterranean mild climate. Highly stochastic dynamical body temperatures with sudden switches allowed us to assess the occurrence of leading indicators of tipping points when approaching a critical transition. Hibernation dynamics showed flickering, which signalled the emergence of alternative attractors. More particularly, body temperature shifted between the alternative states far from the separating bifurcation points, which indicated the existence of long transients in hibernation dynamics. Flickering increased when body temperatures approached bifurcations. Gradual changes in air temperature drove saddle-node bifurcations in body temperatures between activity and hibernation, and the system showed hysteresis. Most metric- and model-based indicators anticipated critical transitions. For hibernating animals, hysteresis may increase resilience to end hibernation earlier than the optimal time, which may occur in regions where temperatures are sharply rising, especially during winter. Temporal changes in early indicators of critical transitions in hibernation dynamics may help to understand the effects of climate on evolutionary life histories and the plasticity of hibernating organisms to cope with shortened hibernation due to global warming., Peer reviewed

Peer reviewed

Peer reviewed