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Previous issue date: 2016-10-31 / A Caatinga ocupa cerca de 800.000 km2, caracterizada por escassez de precipita??o, altas
temperaturas, variabilidade na sazonalidade clim?tica com forte intercala??o de anos de
secas e de inunda??es. Quanto a aspectos fitofision?micos e morfoclim?ticos, apresenta
pelo menos duas fisionomias conhecidas na literatura, Caatinga stricto sensu e Caatinga
lato sensu. A primeira corresponde ?s ?reas situadas na Depress?o Sertaneja Setentrional,
com vegeta??o arbustiva e temperaturas mais elevadas; j? a Caatinga lato sensu
compreende ?reas de vegeta??o arb?rea e arb?reo-arbustivas, sobre topos das chapadas e
serras com mais de 500 m de altitude, e temperaturas mais amenas. Estudos cl?ssicos
destacam a exist?ncia de padr?o de distribui??o relictual para algumas esp?cies de
lagartos, que parecem ser exclusivas de ?reas de Caatinga lato sensu. Nesse contexto, este
trabalho teve como objetivo geral analisar a composi??o e a estrutura da comunidade de
r?pteis Squamata e estudar os comportamentos de termorregula??o e de forrageamento
das esp?cies de lagartos tropidur?deos da Caatinga lato sensu, da Serra de Santana, Lagoa
Nova, RN. Foram realizadas quatros excurs?es de 20 dias cada ? ?rea de estudo, sendo
duas no ano de 2014 (esta??es chuvosa e seca), e duas no ano de 2015 nos mesmos meses
(mar?o e setembro) da coleta do ano anterior. Em 2014, foram registrados e/ou coletados
esp?cimes de Squamata por procura ativa e armadilhas de queda, quando foi registrado
para cada esp?cime ativo o h?bitat, microh?bitat e hor?rio de atividade. Em 2015 foram
realizadas observa??es comportamentais para os lagartos tropidur?deos atrav?s de sess?es
focais para registros dos comportamentos de termorregula??o e de forrageamento. Foram
coletadas 34 esp?cies de Squamata e a curva de rarefa??o n?o atingiu ass?ntota, indicando
a possibilidade de existirem mais esp?cies na ?rea. Destacam-se as presen?as de esp?cies
de distribui??o relictual em ?reas de Caatinga, quais sejam, Acratosaura mentalis,
Enyalius bibronii e Anotosaura vanzolinia. Comparando a composi??o das esp?cies de
lagartos com as de outras ?reas de Caatinga, constatou-se a forma??o de tr?s grupos:
esp?cies de ?rea florestada (brejos de altitude); de Caatinga lato sensu e de Caatinga
stricto sensu. A an?lise do modelo nulo demonstrou que esta comunidade de lagartos est?
estruturada quanto ao uso do espa?o, indicando influ?ncia significativa de fatores
ecol?gicos contempor?neos sobre essa taxocenose. O uso n?o aleat?rio do componente
espacial indicou presen?a de intera??es competitivas que influenciam a sele??o dos
habitats e microhabitats. Os resultados do comportamento termorregulat?rio mostraram
que nesta Caatinga lato sensu as duas esp?cies de tropidur?deos n?o diferem em
comportamento termorregulat?rio, embora T. semitaeniatus se exponha mais ao sol do
que T. hispidus durante a esta??o chuvosa. Quanto ao forrageamento, as duas esp?cies se
comportaram de maneira similar na esta??o seca, mudando de estrat?gia durante a esta??o
chuvosa e, comparando com a Caatinga stricto sensu, as duas esp?cies forrageiam de
forma mais ativa durante a esta??o chuvosa na Caatinga lato sensu. Confirmam-se,
portanto, as presen?as de esp?cies relictuais e de estrat?gias comportamentais diferentes
para os lagartos tropidur?deos de Caatinga lato sensu. / The Caatinga occupies an area of approximately 800,000 km2, and is characterized by
rainfall scarcity, high temperatures, and variability in climatic seasonality, with strong
intercalation of dry and floody years. Among these phytophysiognomic and
morphoclimatic aspects, it is worth noting that this area has at least two landscapes known
in the literature: Caatinga stricto sensu and Caatinga lato sensu. The Caatinga stricto
sensu refers to areas located in the Northern Country Depression (Depress?o Sertaneja
Setentrional), with shrubby vegetation and higher temperatures. On the other hand, the
Caatinga lato sensu comprises areas of arboreal-bushy vegetation located on the tops of
plateaus and mountains with more than 500 m altitude, thus presenting milder
temperatures. Classical studies highlight the existence of a pattern of relictual distribution
for some lizard species of the Caatingas, which seem to be unique from areas of Caatinga
lato sensu. Four 20-day trips were carried to the study area, two in 2014 and two in 2015,
in March (rainy season) and September (dry season). In 2014, Squamata specimens were
registered and/ or collected through active search and pitfall traps, and for each active
specimen, habitat, microhabitat and activity hour were recorded. In 2015, behavioral
observations of tropidurid lizards were carried out through focal sessions to analyze the
themoregulatory and foraging behaviors and compare them with populations of a
Caatinga stricto sensu area. A total of 34 species of Squamata was recorded, and the
rarefaction curve did not reach an asymptote, indicating the possibility of more species in
the area. Noteworthy is the presence of species with relictual distributions, such as
Acratosaura mentalis, Enyalius bibronii and Anotosaura vanzolinia. Comparing the
composition of the lizard species with other Caatinga sites, we observed the formation of
three groups: communities from forested highlands; from areas of Caatinga lato sensu,
and from areas of Caatinga stricto sensu. A null model analysis showed that the studied
lizard community is structured on the spatial niche axis, indicating a significant influence
of contemporary ecological factors on this assemblage. The non-random use of space by
the lizard species indicates the presence of competitive interactions that influence the
selection of habitats and microhabitats used. In general, the two Tropidurus species did
not differ in their thermoregulatory behavior, although T. semitaeniatus exposed yourself
to the sun more than T. hispidus during the rainy season. Regarding the foraging behavior,
T. hispidus and T. semitaeniatus behaved similarly in the dry season, changing strategy
during the rainy season. The two species foraged more actively during the rainy season
in the studied site when compared with an area of Caatinga stricto sensu. In conclusion,
the data obtained in this study confirm the presence of relictual species and the presence
of different behavioral strategies for tropidurid lizards in area of Caatinga lato sensu.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/22705 |
| Date | 31 October 2016 |
| Creators | Kolodiuk, Miguel Fernandes |
| Contributors | 10843175400, http://lattes.cnpq.br/6388455734228621, Ribeiro, Leonardo Barros, 04586009624, http://lattes.cnpq.br/3811678559990456, Miranda, Maria de F?tima Arruda de, 09453997404, http://lattes.cnpq.br/4654421846443562, Nunes, Pedro Murilo Sales, 26345940895, http://lattes.cnpq.br/0714443100383141, Laia, Rafael Camilo, 01440622671, http://lattes.cnpq.br/5295493926456081, Freire, Eliza Maria Xavier, http://lattes.cnpq.br/5295493926456081 |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM PSICOBIOLOGIA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| 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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