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Distribui??o espacial, biologia populacional das esp?cies de braqui?ros e crescimento som?tico de Uca rapax (Smith, 1870) no manguezal de Jabaquara/ Paraty - RJ / Spatial distribution, population biology of the brachyuran crabs (Crustacea, Decapoda) and somatic growth of Uca rapax (Smith, 1870) (Crustacea, Decapoda, Ocypodidae) in the Jabaquara`s mangrove/Paraty - RJ

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Previous issue date: 2011-06-30 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / This study was conducted in the Jabaquara mangrove, Paraty, Rio de Janeiro, with the aim of
investigate the spatial distribution, population biology of brachyuran species and somatic
growth of Uca rapax (Smith, 1870) (Crustacea, Decapoda, Ocypodidae) in the Jabaquara`s
mangrove/Paraty - RJ. Sampling was performed in two grids from July 2007 to June 2008,
using the capture effort per unit. Two collectors captured the crab monthly, during 15 minutes
in low tide. Sediment samples from all the selected plots were collected to determinate
particle size and organic matter. Air temperature and salinity also were measured. Eight
species of brachyuran were captured, U. rapax, U. thayeri, U. vocator, U. uruguayensis, U.
cumulanta, Neohelice granulata, Ucides cordatus and Eurytium limosum. U. rapax was the
most abundant species in number of individuals and ovigerous females. The results indicated
that distribution of the species was influenced by abiotic factors. The most species were more
abundant in the inner portions of the mangroove and near of the sea. The ovigerous females of
U. rapax were more abundant in the inner portions of the mangroove and near from the sea
and N. granulata more distant from the sea. U. rapax showed a positive correlation with
organic matter. U. thayeri, U. uruguayensis and E. limosum negatively correlated to distance
from the sea. U. vocator showed positive correlation for sand and organic matter and
negatively correlated to distance from the sea. U. cumulanta was positively correlated to sand.
The ovigerous females of U. rapax showed a positive correlation to air temperature and
organic matter. N. granulata and U. cordatus were the species more versatile in habitat
colonization. The size of the crabs in the Jabaquara?s Mangrove were the smallest size than
those found in other Brazilian mangroves. However, the males attained a larger size than
females. The size frequency distribution was unimodal for the most species. In general, the
males were predominant in all size classes, and more evident in larger classes. The sex ratio
differ significant from 1:1 proportion (male: female), which most of the time dislocated for
males. The most species showed a seasonal reproductive period, with more abundance of
ovigerous females during the spring and summer. The growth curves in width (mm) for males
and females were described by the equations: LC= 24,28 [ 1- e -0,0038(t-2,8) ] and LC= 22,0 [ 1-
e -0,0031(t-2,3)], respectively. The males reach larger sizes and a higher growth rate than females.
The longevity was estimated at three years for males and four years for females / Este trabalho foi realizado no manguezal de Jabaquara, em Paraty, Rio de Janeiro com o
objetivo de analisar a distribui??o espacial, a biologia populacional das esp?cies de braqui?ros
e o crescimento som?tico de Uca rapax (Smith, 1870) no manguezal de Jabaquara/ Paraty ?
RJ. As coletas foram realizadas em dois grides de julho 2007 a junho2008, utilizando-se a
t?cnica de esfor?o por unidade de captura. Dois coletores capturaram os caranguejos
mensalmente, durante 15 minutos em per?odo de mar? baixa. Amostras de sedimento foram
coletadas nas parcelas selecionadas, para determinar o tamanho das part?culas e mat?ria
org?nica e a temperatura do ar e a salinidade tamb?m foram tomados. Foram capturadas oito
esp?cies de braqui?ros: U. rapax, U. thayeri, U. vocator, U. uruguayensis, U. cumulanta,
Neohelice granulata, Ucides cordatus e Eurytium limosum. U. rapax foi ? esp?cie mais
abundante em n?mero de indiv?duos e de f?meas ov?geras. Os resultados revelaram que a
distribui??o das esp?cies foi influenciada pelos fatores abi?ticos. A maioria das esp?cies foi
mais abundante nas parcelas mais internas do manguezal e pr?ximas ao mar. As f?meas
ov?geras de U. rapax e N. granulata foram mais abundantes nas parcelas mais internas do
manguezal e mais pr?ximas e mais distantes do mar, respectivamente. U. rapax apresentou
correla??o positiva para mat?ria org?nica. U. thayeri, U. uruguayensis e E. limosum
apresentaram correla??o negativa para dist?ncia do mar. U. vocator apresentou correla??o
positiva para areia e mat?ria org?nica e correla??o negativa para dist?ncia do mar. U.
cumulanta apresentou correla??o positiva para areia. As f?meas ov?geras de U. rapax
apresentaram uma correla??o positiva para temperatura do ar e mat?ria org?nica. N. granulata
e U. cordatus foram as esp?cies mais vers?teis em formas de colonizar ambientes. Com
rela??o ao tamanho dos indiv?duos, observou-se que os braqui?ros do Manguezal de
Jabaquara, de maneira geral, apresentam tamanhos maiores que os encontrados em outros
manguezais do Brasil. Contudo, os machos atingiram tamanhos maiores que as f?meas. A
distribui??o de freq??ncia em classes de tamanho foi unimodal para a maioria das esp?cies.
De maneira geral, os machos foram predominantes em todas as classes de tamanho, sendo
mais evidente nas maiores classes. A raz?o sexual diferiu significativamente da propor??o
1:1, estando na maioria das vezes deslocada para os machos. A maioria das esp?cies
apresentou um per?odo reprodutivo sazonal, ocorrendo maior abund?ncia de f?meas ov?geras
na primavera e no ver?o. O modelo de von Bertalanffy foi utilizado para a descri??o do
crescimento. As curvas de crescimento em largura (mm) para machos e f?meas de U. rapax,
foram descritas pelas equa??es: LC= 24,28 [ 1- e -0,0038(t-2,8) ] e LC= 22,0 [ 1- e -0,0031(t-2,3)],
respectivamente. Os machos apresentaram uma taxa de crescimento maior do que as f?meas.
A longevidade foi estimada em 3 anos para os machos e 4 anos para as f?meas.

Identiferoai:union.ndltd.org:IBICT/oai:localhost:jspui/1189
Date30 June 2011
CreatorsBED?, Luciane Marins
ContributorsOshiro, Lidia Miyako Yoshii
PublisherUniversidade Federal Rural do Rio de Janeiro, Programa de P?s-Gradua??o em Biologia Animal, UFRRJ, Brasil, Instituto de Ci?ncias Biol?gicas
Source SetsIBICT Brazilian ETDs
LanguagePortuguese
Detected LanguageEnglish
Typeinfo:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis
Formatapplication/pdf
Sourcereponame:Biblioteca Digital de Teses e Dissertações da UFRRJ, instname:Universidade Federal Rural do Rio de Janeiro, instacron:UFRRJ
Rightsinfo:eu-repo/semantics/openAccess
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