Banca de DEFESA: CLARISSE CAROLINE DE OLIVEIRA E SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : CLARISSE CAROLINE DE OLIVEIRA E SILVA
DATE: 03/05/2021
TIME: 08:00
LOCAL: sala virtual - google meet
TITLE:

Apparent survival of neotropical birds and factors related to their variation


KEY WORDS:

South America; life history; Demography; apparent survival; Capture-mark-recapture;


PAGES: 136
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

Understanding factors related to birds’ life-history traits variation is essential to answer ecological and evolutionary questions. Studies about variations in life histories examine mainly the effects of limited food, predation, and climatic conditions. As a result of trade-offs, variations in life histories follow a ‘slow-fast tendency’ which ranges from high fertility and low survival to low fertility and high survival. Thus, tropical species tend to invest more in self-maintenance than in current reproduction, while species from temperate zones do the opposite. Tropical environments are considered to be less seasonal and have high food resource stability. However, this information is based essentially on humid tropical environments. Pondering these knowledge gaps about Neotropical environments, we aimed to verify the applicability of these pre-established standards regarding the Neotropical birds’ life history. We gathered a field database from 15 sample areas plus 11 more areas from literature data. In this thesis, we used survival estimates from 327 populations, of which 147 were unpublished estimates and 180 estimates from the literature. Field collections took place at different times between 1999 and 2019. The sampling time in each area ranged from 2 to 20 years. The sampling areas covered latitude variation from 20º N to 34º S. We used survival estimates of environments with different intensities of climatic seasonality to test the hypothesis of a relationship between climatic seasonality and survival. The survival values found were similar throughout South America, indicating that other factors may act more intensely on the survival variations of these birds. Our results suggest that the seasonality conditions in South America are not intense enough to reflect on the species survival. Behavioral and physiological changes may mitigate the extrinsic mortality of adults. Furthermore, the young high mortality rates suggest that birds from seasonal tropical environments also favor residual reproductive investment through strategies that guarantee greater survival expectancy for individuals.


BANKING MEMBERS:
Interno - 1718346 - EDUARDO MARTINS VENTICINQUE
Externa à Instituição - Luciana Vieira de Paiva - UFERSA
Externa à Instituição - MARIA ALICE DOS SANTOS ALVES - UERJ
Presidente - 1439088 - MAURO PICHORIM
Externa à Instituição - MILENA WACHLEVSKI MACHADO - UFERSA
Notícia cadastrada em: 20/04/2021 14:20
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