martes, 1 de agosto de 2017

New Publication on Ferreret, the Majorcan midwife toad !


Pinya, S., Tavecchia,G. and Valentín Pérez-Mellado, V. Population model of an endangered amphibian: implications for conservation management  Endangered Species Research, 34: 123–130, doi.org/10.3354/esr00835

From Wikipedia.com
Abstract: Amphibian populations are declining worldwide, but for many taxa, robust estimates
of demographic parameters to assess population state or trends are scarce or absent.
robust estimates of adult apparent survival of the endemic Majorcan midwife toad Alytes muletensis using individual capture-recapture data collected over 4 yr in a 60 m2 cistern. Moreover, we combined the vital rates into a stage-structured population model to estimate the ex pected longterm growth rate of the population. Apparent survival estimates of males and females were similar (0.737 ± 0.042 and 0.726 ± 0.045, respectively) indicating that the egg-carrying behavior of males, typical of this species, does not reduce its survival probability. We found evidence of a low local survival of juveniles compared with adults, most likely due to permanent dispersal. Adult population size estimation provided higher tadpole:adult ratios than previously reported for this endangered species, suggesting an overestimation of the previous adult population size. Model projections suggested a stable population, since λ, the expected asymptotic growth rate of the population, was close to 1.00.

Full text here

lunes, 24 de julio de 2017

Shearwaters at night : the video !

Camera-traps reveal the territorial behaviour of nesting Cory's Shearwater.
video
Stay tuned for more videos

lunes, 10 de julio de 2017

Upcoming CMRR workshop 2017. Apply now !

Workshop on Capture-Mark-Recapture and -Recovery analysis 2017 : you can subscribe now!

The introductory course aims to introduce students, researchers and environmental managers to the theory and practical aspects of the analysis of capture-mark-recapture and –recovery. 
We will focus on how to estimate survival, recruitment and dispersal probabilities in natural populations.
The course is based on theoretical classes as well as practical sessions with real and simulated data.
No previous knowledge on capture-mark-recapture or capture-mark-recovery analyses is necessary.


 

If you want to subscribe send message to : g.tavecchia-at-uib.es

For more information on the program and course payment : http://populationecologygroup.blogspot.com.es/p/workshop.html

miércoles, 5 de julio de 2017

Storm Petrel Day ended

Photo D. Revenga
Storm Petrel Day at Benidorm Island ended. It ws a good occasion to meet other research teams and set monitoring protocole and collaborative research. Press note (in Spanish) and nice pictures by D. Revenga here. All is ready for the next 25 years!
B Massa & A Sanz (Photo: D. Revenga)




martes, 27 de junio de 2017

Gull tracking on the news!

Photo: G. Tavecchia
GSM/GPS data are generating a growing interest in gulls' feeding strategy. A new article by E. Soto in the newspaper El Mundo (here) has just been published on the monitoring of Yellow-legged Gulls at Dragonera. Long-distance tracks and daily feeding strategies are on the spot. Thank also to the help of T. Muñoz from the GOB (Grup Balear d'Ornitologia I Defensa de la Naturalesa)

sábado, 24 de junio de 2017

Storm Petrel Days at Benidorm Island


The 29-30th of June the Natural Park of Sierra Gelada organizes the European Storm Petrel Day at Benidorm to mark the 25 years of populaiton monitoring. 
Special guest: Dr A. Sanz-Aguilar, who contributed to more than half of the period. 

martes, 20 de junio de 2017

New Publication on Spoonbill population dynamics!

Tenan S, Fasola M, Volponi S, Tavecchia G. Conspecific and not performance-based attraction on immigrants drivescolony growth in a waterbird. J Anim Ecol. 2017;00:1–8. https://doi.org/10.1111/1365-2656.12690

Abstract
  1. Local recruitment and immigration play an important part in the dynamics and growth of animal populations. However, their estimation and incorporation into open population models is, in most cases, problematic. We studied factors affecting the growth of a recently established colony of Eurasian spoonbill (Platalea leucorodia) and assessed the contribution of local recruits, i.e. birds born in the colony, and immigrants, i.e. birds of unknown origin, to colony growth.
  2. We applied an integrated population model that accounts for uncertainty in breeding state assignment and merges population surveys, local fecundity and individual longitudinal data of breeding and non-breeding birds, to estimate demographic rates and the relative role of recruitment and immigration in driving the local dynamics. We also used this analytical framework to assess the degree of support for the ‘performance-based’ and ‘conspecific attraction’ hypotheses as possible mechanisms of colony growth.
  3. Among the demographic rates, only immigration was positively and significantly correlated with population growth rate. In addition, the number of immigrants settling in the colony was positively correlated with colony size in the previous and current year, but was not correlated with fecundity of the previous year.
  4. Our results suggest that the variation in immigration affected colony dynamics and that conspecific attraction likely triggered the relevant role of immigration in the growth of a recently formed waterbird colony, supporting the need of including immigration in population analysis.
You can see press release (in Italian) following the links belows:
http://www.ilvelino.it/it/article/2017/06/08/oltre-500-esemplari-di-spatola-nel-delta-del-po/6a079c85-14eb-4359-9659-07fdbd153b93/

https://www.galileonet.it/2017/06/la-spatola-nel-delta-del-po-ama-la-compagnia/

http://www.quotidiano.net/benessere/animali/animali-spatola-po-1.3184337

http://www.italiaambiente.it/2017/06/08/uccello-spatola-sul-delta-del-po-due-cinquecento-28-anni/

http://www.greencity.it/ambiente/9472/oltre-500-esemplari-di-spatola-nel-delta-del-po.html

http://www.meteoweb.eu/2017/06/ambiente-ispra-uno-studio-rivela-la-singolare-diffusione-di-uccello-spatola-nel-delta-del-po/914077/

http://www.periodicodaily.com/2017/06/09/oltre-500-esemplari-di-spatola-nel-delta-del-po/

https://www.ladeadellacaccia.it/index.php/oltre-500-esemplari-di-spatola-nel-delta-del-po-45712/