Ecologia reprodutiva, ocupação e rede de associação em Cyanocorax cyanopogon (aves, Corvidade)
Although costly, group living is widely distributed in nature. Among birds, jays and crows (Corvidae) stand out for their cognitive ability and for forming social groups that provide better performance in caring for offspring. Cyanocorax cyanopogon (White-naped Jay) is a corvid endemic to Brazil...
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| Formato: | doctoralThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/50126 |
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| Resumo: | Although costly, group living is widely distributed in nature. Among birds, jays and crows
(Corvidae) stand out for their cognitive ability and for forming social groups that provide better
performance in caring for offspring. Cyanocorax cyanopogon (White-naped Jay) is a corvid
endemic to Brazil and occurs mainly in the Caatinga and Cerrado biomes, both with a strong
seasonal component, alternating between periods of low and high productivity. To understand
the strategies used by these birds to live in these biomes: 1) we used data from citizen science
and circular statistics to verify if they adjust their reproduction to the availability of resources in
the environment; 2) we used a probabilistic multimodel approach to test if environmental
characteristics and resource availability interfere in their occurrence and size of home range in
a Caatinga area; and 3) we used a social animal network approach to analyze the association
networks of individuals at the area of FLONA-Açu. In our nest records we found that the
development of the nestlings lasts about 5 months, from the time of nest construction until the
nestlings have acquired adult plumage. Putting our breeding records together with those
available on Wikiaves and comparing them with the Worldclim precipitation data, we found that
most of the records anticipate the month with the highest rainfall. We also found that this trend
is stronger in the Cerrado than in the Caatinga. We compared 64 models generated from our
global model with environmental variables. Of the total, 4 models were the most representative.
The most relevant variables for occupancy were: season, distance from headquarters and NDVI.
In this model the occupancy estimate for the rainy period was almost half of what was observed
in the dry period. Occupancy also varied positively as a function of NDVI and negatively as a
function of distance from headquarters, both with greater effect in the rainy season. We
captured and ringed 89 individuals at the headquarters of the Açu National Forest. We built
three association nets with 72 individuals captured and banded during the three years of the
study. We found that the dry season net had a larger number of individuals and a more intense
pattern of interactions than the rainy season net. We also saw that despite the variation in the
number of individuals, the individual values did not vary much between the seasons. We also
found that the association between the observed individuals remained consistent over time. |
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