Thursday, 6 May 2021
Sunday, 2 May 2021
Mingozzi, T., Storino, P., Venuto, G., Massolo, A., Tavecchia, G., 2021. Climate warming induced a streth of the breeding season and an increase of second clutches in a passerine breeding at its altitude limits. Current Zoology, zoab029, https://doi.org/10.1093/cz/zoab029
Abstract: The increase in the average air temperature due to global warming has produced an early onset of the reproduction in many migratory birds of the Paleartic region. According to the “mismatch hypothesis” this response can lead to a decrease in the breeding output when the conditions that trigger the departure from the wintering areas do not match the availability of food resources in the breeding ground. We used 653 brooding events registered during the period 1991–2013 to investigate the link between climatic variables and individual breeding performance of a partially migratory passerine, the Rock SparrowPetronia petronia, breeding at the altitude limit of its distribu-tion.
|Photo: Corrado Damiano|
The laying date (LD) of the earliest first clutch was associated with local spring (minimum) temperatures but did not show a significant trend during the period considered. The LD of the latest first clutch had a positive and statistically significant trend, unrelated to local covariates and resulting in a longer breeding season (1.5 days/year). A longer breeding season allowed birds to produce more second clutches, which proportion increased from 0.14 to 0.25. The average breeding success was also positively correlated with the average temperature in July and with the duration of the breeding season. Contrary to expectations, the most important climate-dependent effect was a stretch of the breeding season due to a significant increase of the LD of the latest first-clutches rather than an earlier breeding onset. We show how climate changes act on bird populations through multiple paths and stress the need to assess the link between climatic variables and several aspectsof the breeding cycle.
Sunday, 18 April 2021
Take a picture of a marked gull and win an original T-Shirt.
Presence-absence data of marked animals are extremely important as they can be used to estimate annual survival probability and movements of individuals within the breeding colony.
The project, funded by the Spanish Ministery of Science and Education, will investigate how the management of discards from human activities influences the ecology of gulls.
To subscribe write your name and telephone number to:email@example.com
Sunday, 11 April 2021
Gangoso, L., Cortés-Avizanda, A., et al. 2021. Avian scavengers living in anthropized landscapes have shorter telomeres and higher levels of glucocorticoid hormones. Science of the Total Environment.146920, https://doi.org/10.1016/j.scitotenv.2021.146920
Abstract: Habitat anthropization is a powerful stressor affecting the health and fitness of organisms, ultimately impacting their population dynamics. In vertebrates, stressful living conditions are usually associated with elevated glucocorticoids-based responses (GCs) as well as shorter telomeres, which are in turn associated with decreased overall body condition fitness and life expectancy. However, our understanding of how habitat anthropization per se and population processes synergistically, or independently, may affect GCs and telomere dynamics in natural populations is still very limited.
Thursday, 1 April 2021
Saturday, 27 March 2021
Tavecchia, G., Gimenez, O., Choqut, R., Oro, D., Tenan, S. and Sanz-Aguilar, A. 2021.The trap of hidden processes: Why ‘quick & dirty’ methods to estimate mortality are not always good. A comment to De Pascalis et al. (2020) Biological Conservation, 109057, doi: 10.1016/j.biocon.2021.109057
Wednesday, 24 March 2021
The Yellow-legged gull campaign is on the starting blocks. Last year it has been difficult due to the lockdown in the middle of the breeding season. This year we are ready to catch up with a new fieldwork campaign in Ibiza and some extra help. We are warming up with some press notes and radio interview.
|Illustration by Pelopanton|
A press note about the project here and a radio interview by Dr. Ana Sanz-Aguilar here
A press release on birds and landfill on the White Stork paper ( here ) just came out here (in Spanish).
The research by A. Rotger Vallespir had make the news here and here . Andreu showed how the scale pattern on the head of the snake Hemorrh...
The last work published by members of the GEDA received media attention: REWILDING ( here ) IMEDEA press release CSiC Press note ‘R...
Prieto, N., Tavecchia, G., Telletxea, I, Ibañez, R., Ansorregi, F., Galdos, A., Urruzola, A., Iriarte, I. and Ariziaga, J. 2019 Sur vival p...