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Previous issue date: 2014-05-13 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / O g?nero Hemidactylus Oken, 1817 tem distribui??o cosmopolita e, no Brasil, ocorrem tr?s esp?cies, sendo duas nativas, H. brasilianus e H. agrius, e uma ex?tica, H. mabouia. Tomando como base os estudos sobre ecologia de lagartos efetuados na Esta??o Ecol?gica do Serid?, de 2001 a 2011, este trabalho buscou reavaliar a ocorr?ncia das esp?cies do g?nero Hemidactylus nesta ESEC, analisar aspectos ecol?gicos e biol?gicos da popula??o de H. agrius; e investigar a distribui??o atual e potencial das esp?cies nativas do g?nero na regi?o nordeste, analisando a adequabilidade da ESEC para este t?xon. Para os dois primeiros objetivos, uma ?rea de amostragem constitu?da por cinco transectos de 200 m x 20 m, foi inspecionada em turnos alternados por tr?s dias consecutivos, de agosto de 2012 a agosto de 2013. Para a ?ltima perspectiva, foram consultados pontos de ocorr?ncia de H. agrius e H. brasilianus na literatura e no banco de dados da Cole??o Herpetol?gica da Universidade Federal do Rio Grande do Norte para constru??o de mapas preditivos, atrav?s do algoritmo de M?xima Entropia (MaxEnt). Na ESEC Serid? foram coletados 62 H. agrius (25 f?meas, 18 machos e 19 juvenis) e dois rec?m-nascidos foram obtidos a partir de um ninho comunal incubado em laborat?rio, nenhum registro foi feito para as demais esp?cies do g?nero. Hemidactylus agrius demostrou ser uma esp?cie noturna com especialidade a h?bitats com Afloramentos Rochosos, no entanto, generalista quanto ao uso de microh?bitats. Nesta popula??o as f?meas possuem comprimento corporal m?dio maior que o dos machos e apresentaram maiores frequ?ncias de autotomia caudal. Em rela??o ? dieta, H. agrius ? uma esp?cie moderadamente generalista, que consome artr?podes, principalmente Aranae, Orthoptera e Isoptera; e vertebrados, al?m de ter constatado um caso de canibalismo. Quanto ? sazonalidade foram registradas diferen?as apenas para o n?mero dos itens alimentares consumidos. A dieta foi similar entre os sexos, por?m diferen?as ontogen?ticas foram registradas para o volume total e comprimento m?ximo dos itens alimentares. Rela??es significativas foram constatadas entre o tamanho do corpo e da cabe?a dos esp?cimes com o comprimento m?ximo das presas consumidas. Casos de polidactilia e de bifurca??o caudal foram registrados na popula??o com frequ?ncias de 1,6 % e 3,1%, respectivamente. Em rela??o ?s localidades de ocorr?ncia das esp?cies nativas, foram constatados 27 pontos, sendo 14 para H. agrius e 13 para H. brasilianus; a primeira apresentou distribui??o restrita, enquanto que a segunda demonstrou ampla distribui??o. Em ambos os modelos gerados a ?rea da ESEC Serid? apresentou de m?dia a alta adequabilidade. Os resultados deste trabalho confirma a aus?ncia de H. brasilianus e H. mabouia nesta ESEC e confere a H. agrius condi??o de esp?cie canibal oportunista. Al?m disso, confirma os padr?es de distribui??o exibidos pelas esp?cies nativas de Hemidactylus e aponta a ESEC Serid? como ?rea de prov?vel ocorr?ncia para as esp?cies do g?nero, constatando, assim, que o estabelecimento de H. brasilianus e de H. mabouia, possivelmente, ? limitado por fatores bi?ticos, ainda pouco esclarecidos. / The genus Hemidactylus Oken, 1817 has cosmopolite distribution, with
three species occurring in Brazil, two of them native, H. brasilianus and H.
agrius, and one exotic, H. mabouia. Considering the studies about ecology
of lizards conducted in the Ecological Station of the Serid?, from 2001 to
2011, this study aimed (1) to re-evaluate the occurrence of the species of
Hemidactylus in this ESEC; (2) to analyze ecological and biological aspects
of the H. agrius population; and (3) to investigate the current and potential
distribution of the native species of the genus in northeastern Brazil,
analyzing the suitability of ESEC to this taxon. For the first two objectives, a
sampling area consisting of five transects of 200 x 20 m, was inspected in
alternating daily shifts for three consecutive days, from August 2012 to
August 2013. For the latter objective, occurrence points of H. agrius and H.
brasilianus from literature and from the database of Herpetological
Collections of the UFRN and the UNICAMP were consulted to build
predictive maps via the Maximum Entropy algorithm (MaxEnt). In ESEC
Serid?, 62 H. agrius individuals were collected (25 females, 18 males and
19 juveniles), and two neonates were obtained from a communal nest
incubated in the laboratory. No record was made for the other two species
of the genus. Hemidactylus agrius demonstrated to be a nocturnal species
specialized in habitats with rocky outcrops; but this species is generalist
regarding microhabitat use. In the population studied, females had an
average body length greater than males, and showed higher frequencies of
caudal autotomy. Regarding diet, H. agrius is a moderately generalist
species that consumes arthropods, especially insect larvae, Isoptera and
Araneae; and vertebrates, with a case of cannibalism registered in the
population. With respect to seasonal differences, only the number of food
items ingested differed between seasons. The diet was similar between
sexes, but ontogenetic differences were recorded for the total volume and
maximum length of the food items. Significant relationships were found
between lizard body/head size measurements and the maximum length of
prey consumed. Cases of polydactyly and tail bifurcation were recorded in
the population, with frequencies of 1.6% and 3.1%, respectively. In relation
xv
to the occurrence points of the native species, 27 were identified, 14 for H.
agrius and 13 for H. brasilianus. The first species presented restricted
distribution, while the second showed a wide distribution. In both models
generated, the ESEC Serid? area showed medium to high suitability. The
results of this study confirm the absence of H. brasilianus and H. mabouia
this ESEC, and reveal H. agrius as a dietary opportunist and cannibal
species. Further, the results confirm the distribution patterns shown by
native species of Hemidactylus, and point ESEC Serid? as an area of
probable occurrence for the species of the genus, the establishing of H.
brasilianus and H. mabouia are probably limited by biotic factors, a fact yet
little understood
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/19439 |
| Date | 13 May 2014 |
| Creators | Andrade, Maria Jaqueline Monte de |
| Contributors | 10843175400, http://lattes.cnpq.br/6388455734228621, Pichorim, Mauro, 50373625987, http://lattes.cnpq.br/5696697654544552, Anjos, Luciano Alves dos, 26614021877, http://lattes.cnpq.br/8640478018562885, Freire, Eliza Maria Xavier |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM CI?NCIAS BIOL?GICAS, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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