El Centre de Ciència i Tecnologia Forestal de Catalunya (CTFC), amb seu a Solsona (Lleida), es va constituir inicialment entre el Consell Comarcal del Solsonès i la Universitat de Lleida l'any 1996, i posteriorment, s'hi van incorporar la Diputació de Lleida, la Fundació Catalana per a la Recerca i la Innovació, la Generalitat de Catalunya, la Universitat Autònoma de Barcelona, la Diputació de Barcelona i l'Ajuntament de Solsona.
El CTFC és un consorci públic adscrit a l’Administració de la Generalitat de Catalunya i s’hi relaciona mitjançant el Departament competent en matèria de boscos. També forma part dels centres de recerca de Catalunya (CERCA) i està acreditat com agent TECNIO per la Generalitat (desenvolupador de tecnologia públic). [Més informació]
Browsing Centre de Ciència i Tecnologia Forestal de Catalunya (CTFC) by Subject "Age structure"
(Elsevier, 2022) Moreno-Zarate, Lara; Arroyo, Beatriz; Sardà-Palomera, Francesc; Rocha, Gregorio; Bota, Gerard; Peach, Will J.
Knowledge of seasonal variation in hunting pressure and the demographic composition of hunting bags is likely to be important for the effective management of quarry species. Such knowledge is particularly important where regulatory mechanisms aim to avoid the over-exploitation of quarry species having unfavourable conservation status. We compiled information on the age composition of harvested European Turtle-doves (Streptopelia turtur), and the daily numbers of doves shot and retrieved from 68 hunting estates spread across four Spanish regions. We use these data to describe temporal variation, and identify factors affecting daily hunting bags, age composition and crippling losses. We found that more juvenile doves were hunted than adults (and more than expected in a stable population) especially at the beginning of the hunting season, suggesting greater vulnerability of juveniles to hunting. The number of doves hunted each day declined through the hunting season and increased with the number of hunters present. Crippling losses averaged 9.6 % of all doves shot; applying this rate to recent Spanish government hunting statistics suggests under-recording of approximately 90,000 doves annually for the entire country. Our data on age composition and crippling losses can serve as direct inputs into future models of sustainable harvest for Turtle Dove in Europe. Our results highlight the importance of improving knowledge about the variables influencing take at the hunting event level for designing more efficiency regulatory measures.
Demographic traits were analyzed in the Pyrenean brook newt (Calotriton asper) to evaluate whether its variability responds to the adaptation to the different habitats. In this study, life history traits of Calotriton asper were studied in nine populations living in two different kinds of habitats in the Pyrenees mountains: lakes and streams. Skeletochronology was used to determine age structure and different traits such as age at maturity and longevity. Age structure was different between populations and sexes. The two lacustrine populations, with facultative pedomorphosis, attained their maturity earlier. Age at sexual maturity ranged from 4 to 9 years and in some populations was similar between sexes while in others, females matured at younger ages than males. Maximum longevity varied from 7 to 35 years among populations and was correlated with the age at sexual maturity. Body size differed among populations, was sexually dimorphic, and this disparity was not related to the kind of habitat. The maximum size was found in the lacustrine population but exhibited high variation between populations. The results obtained show a significant variability between sexes and populations, in age and body size structure of Calotriton asper that did not depend on the habitat.