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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Aspectos sobre a biologia de daption capense na Ilha Elefante, Antártica

Basler, Aparecida Brusamarello 23 July 2012 (has links)
Submitted by William Justo Figueiro (williamjf) on 2015-07-20T23:20:31Z No. of bitstreams: 1 58c.pdf: 769092 bytes, checksum: d9e0dc98714105aed66b07b2534daa0b (MD5) / Made available in DSpace on 2015-07-20T23:20:31Z (GMT). No. of bitstreams: 1 58c.pdf: 769092 bytes, checksum: d9e0dc98714105aed66b07b2534daa0b (MD5) Previous issue date: 2012 / Nenhuma / Daption capense apresenta distribuição circumpolar, sendo bastante abundante no Hemisfério Sul. Reproduz principalmente em ilhas subantárticas, na Península e no Continente Antártico. Na Ilha Elefante, Arquipélago das Shetlands do Sul, também se apresenta como reprodutivo, porém poucos dados sobre a sua biologia são encontrados para esta localidade. É considerado um pequeno Procellariiforme, e dentro deste grupo, como a espécie que menos apresenta dimorfismo entre os indivíduos, porém podem apresentar certa diferença quanto às medidas morfométricas. Medidas morfométricas têm sido consideradas importantes ferramentas na suposição de determinado sexo. Considerando-se a importância das variáveis morfométricas na compreensão dos aspectos biológicos e em especial para a determinação sexual, objetivouse com este estudo (i) determinar o sexo dos indivíduos de D. capense através de técnicas moleculares e (ii) verificar quais variáveis morfométricas distinguem melhor machos de fêmeas. O estudo foi realizado na Ilha Elefante, nos períodos correspondentes ao verão austral, entre os anos de 2010/11 e 2011/12. Foram capturados 52 indivíduos adultos de D. capense, sendo 32 no verão austral de 2010/11 e 20 entre os anos de 2011/12, os quais foram anilhados e realizadas as medidas morfométricas. Foram coletadas ainda amostras de sangue para a realização de sexagem, dos quais 33 foram determinados como machos e 19 como fêmeas. As variáveis mais significativas para a determinação sexual, segundo a Análise Discriminante Stepwise foram dedo médio (F=12,222; gl 1,50; p=0,001) e a altura do bico (F=18,931; gl 2,49; / Daption capense presents circumpolar distribution, being very abundant in the Southern Hemisphere Plays mainly in subantarctic islands, the Antarctic Peninsula and on the Continent. In Elephant Island, South Shetland Archipelago is also presented as breeding, but few data on its biology are found for this location. It is considered a small Procellariiform, and within this group, as the species shows that less dimorphism among individuals, but may have some difference as to morphometric measurements. Given the importance of morphometric variables in the understanding of biological aspects, particularly for determining sexes, the objective of this study is to (i) determine the sex of individuals of D. capense through molecular techniques and (ii) verify which morphological variables better distinguish males from females. The study was conducted on Elephant Island, between October and March, which corresponds with austral summer in the Southern Hemisphere, in 2010/2011 and 2011/12. Fifty-two adult D. capense individuals were captured: 32 in the austral summer of 2010/11 and 20 in the years 2011/12. Each bird was banded and measured. Blood samples were collected to be used in determining the sex of the individuals, which showed that 33 were males and 19 were females. The average and standard error were calculated for the morphometric measurements of the individuals before and after sex determination. Sexual dimorphism between males and females of D. capense was confirmed, and the significant morphometric variables for sexual determination were middle toe length (F=12.222; gl 1, 50; p=0.001) and beak height (F=18.931; gl 2, 49; p

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