História natural de Philodryas patagoniensis (sepentes: colubridae) no litoral do Rio Grande do Sul, Brasil

التفاصيل البيبلوغرافية
العنوان:	História natural de Philodryas patagoniensis (sepentes: colubridae) no litoral do Rio Grande do Sul, Brasil
بيانات النشر:	Pontifícia Universidade Católica do Rio Grande do Sul Porto Alegre 2007
تفاصيل مُضافة:	Lema, Thales de
نوع الوثيقة:	Electronic Resource
مستخلص:	The present study was carried out in the coastal plain of Rio Grande do Sul with the objective of describe the natural history of the snake Philodryas patagoniensis in this region. The methodology applied was the analysis of digestive tract and reproductive system of specimens in collections collected in the region, and the use of marc-recapture technique in specimens in a 333ha sand dunes area in Balneário Pinhal municipality. Information on diet was obtained from the analysis of 89 specimens kept in collections, and 507 encounters in the study area. From 51 snakes with gut contents, 66 prey items from seven taxonomic categories (fish, anurans, lizards, amphisbaenians, snakes, birds, and rodents), were recorded, indicating the generalist habits of this species. Anurans, present in 56% of the tracts, were the most preyed categories. An ontogenetic shift in the diet was observed, either quantitative (number of items preyed and relative importance) and qualitative (categories consumed). For the study of reproductive aspects and sexual dimorphism were examined the gonads of 88 specimens (52, 36 ) held in collections, besides information on 393 live specimens collected in the study area. Females are born with larger snout-vent length (SVL) than males, and also reach a larger maximum SVL, but males have relatively longer tails. Females reach sexual maturity after the second year of life, while some males can reach it in the first year. Reproduction is seasonal, with vitellogenesis occurring from August to February, clutches from November to February, and births from January to March. The number of eggs per clutch ranged from seven to 21, while the number of vitellogenic follicles ranged from five to 17. The number of eggs and vitellogenic follicles was not related to the SVL of females. The relative clutch mass ranged from 0,217 to 0,403. The pattern of seasonal and daily activity was studied based on 479 encounters recorded in the studied area. Active specimens were fou O presente estudo foi realizado no litoral do Rio Grande do Sul, objetivando o conhecimento da história natural da serpente Philodryas patagoniensis nesta região. A metodologia utilizada foi o exame do tubo digestório e sistema reprodutor de espécimes depositados em coleções científicas procedentes do litoral do Estado, e o uso de marcação e recaptura de indivíduos em uma área de dunas com 333 ha localizada no Município de Balneário Pinhal. Informações sobre a dieta da espécie, foram obtidas a partir da análise de 89 exemplares depositados em coleções e em 507 encontros ocorridos na área de estudo. A partir de 51 serpentes com conteúdo no trato digestório foi registrado um total de 66 presas pertencentes a sete grupos taxonômicos (peixes, anuros, lagartos, anfisbenas, serpentes, aves e roedores), evidenciando o caráter generalista da espécie. Anuros foram a categoria mais consumida, estando presente em 56% das serpentes com algum conteúdo no trato digestório. Foi registrada variação ontogenética na dieta, tendo sido observadas diferenças quantitativas (número de itens diferentes consumidos e importância relativa de cada item) e qualitativas (tipos de itens consumidos). Para o estudo de aspectos reprodutivos e dimorfismo sexual, foram examinadas as gônadas de 88 exemplares (52 fem. e 36 mas. ) depositados em coleções científicas, e analisadas informações de 393 indivíduos capturados na área de estudo. Fêmeas nascem com maior CRC que os machos e também atingem um CRC superior, mas estes possuem a cauda relativamente mais longa. Fêmeas alcançam a maturidade sexual a partir do segundo ano de vida, mas alguns machos podem atingí-la ainda no primeiro ano. A reprodução é sazonal, com vitelogênese ocorrendo de agosto a fevereiro, desovas entre novembro e fevereiro e nascimentos entre janeiro e março.O número de ovos por desova variou de sete a 21, enquanto o número de folículos vitelogênicos variou de cinco a 17. O número de ovos ou folículos vitelogênicos não foi relaciona
مصطلحات الفهرس:	ZOOLOGIA, SERPENTES - RIO GRANDE DO SUL, COLUBRÍDEOS, HERPETOLOGIA, COBRAS - HÁBITOS E CONDUTA, doctoralThesis
URL:	http://hdl.handle.net/10923/5327
الإتاحة:	Open access content. Open access content
ملاحظة:	Português
أرقام أخرى:	BRCRG oai:meriva.pucrs.br:10923/5327 1319711246
المصدر المساهم:	PONTIFICA UNIV CATOLICA RIO GRANDE SUL From OAIster®, provided by the OCLC Cooperative.
رقم الأكسشن:	edsoai.on1319711246
قاعدة البيانات:	OAIster

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