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Registros recuperados: 10
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Araçá: biodiversidade, impactos e ameaças Biota Neotropica
Amaral,Antonia Cecília Zacagnini; Migotto,Alvaro Esteves; Turra,Alexander; Schaeffer-Novelli,Yara.
Inserida em uma das mais belas e turísticas regiões litorâneas do país - o Litoral Norte do Estado de São Paulo -, a Baía do Araçá (São Sebastião, SP), além de conter remanescentes de manguezal e de abrigar alta diversidade biológica, é também um verdadeiro laboratório a céu aberto e um importante reduto de catadores de moluscos e pescadores artesanais. Com o objetivo de compilar preliminarmente a biodiversidade da baía, este estudo reúne a extensa bibliografia dedicada à região e apresenta a lista das espécies da fauna e da flora formalmente reportadas para o local. O texto sumaria ainda o histórico das alterações antrópicas sofridas nas últimas décadas e destaca certos representantes da fauna (espécies novas, ameaçadas de extinção, bioindicadoras e como...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Flora; Fauna; Alterações; Ameaças; Conservação; Araçá.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000100022
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Composition and seasonal variation of brachyura and anomura (Crustacea, Decapoda) associated with brown mussel farms at Praia da Cocanha, Brazil BABT
Bernadochi,Ligia Coletti; Silvestri,Fausto; Turra,Alexander.
The composition and seasonal variation of brachyuran and anomuran species associated with mussel farms were evaluated at Praia da Cocanha, São Paulo between May 2007 and February 2008. Nine mussel ropes were sampled at random in each quarter, and 1,208 organisms were identified, comprising five families and 28 species. The most numerous species was the porcellanid Pachycheles laevidactylus (18.5%), followed by the xanthids Acantholobulus schmitti (16.6%), Hexapanopeus paulensis (11.3%), Panopeus americanus (10.2%), and Menippe nodifrons (8.4%). The exotic crab Charybdis hellerii was recorded throughout the study period. The ecological descriptors, except Pielou evenness index, varied significantly over the time. The highest abundance and diversity of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Associated fauna; Mussel culture; Perna perna; Crustaceans; Community ecology.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000400010
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Embryonic development and duration of incubation period of tropical intertidal hermit crabs (Decapoda, Anomura) Zoologia
Turra,Alexander; Leite,Fosca Pedini Pereira.
The description of the embryonic development of the hermit crabs Clibanarius antillensis Stimpson, 1859, C. sclopetarius (Herbst, 1796), C. vittatus (Bosc, 1802), and Pagurus criniticornis (Dana, 1852) and preliminary observations on the development of Pagurus brevidactylus (Stimpson, 1858) and Paguristes tortugae Schmitt, 1933 were done. The analysis of the external morphology of the embryos of the studied species allowed the identification of seven stages: Stage 1, Zygote and cleavage; Stage 2, Homogeneous mass (advanced cleavage and gastrulation); Stage 3, Initiation of the germinal disc (yolk-free area); Stage 4, Percentage of yolk-free area from 5% to 50-70%; Stage 5, Eye pigmentation (comma-shape) and heart beating; Stage 6, Percentage of yolk-free...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Clibanarius; Life history strategies; Pagurus; Reproduction.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752007000300020
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Hermit crab (Decapoda, Anomura) attraction to dead gastropod baits in an infralittoral algae bank BABT
Pezzuti,Juarez C. B.; Turra,Alexander; Leite,Fosca P. P..
Hermit crabs use gastropod shells as shelter and are adapted to follow chemical cues released from tissues of dead or injured gastropods as a way to find new and more adequate shells. The species composition, crab size, shell types adequacy and physical condition were compared between attracted individuals and crabs collected in previous samples. The previous sampling was carried out in five areas before each experiment. Then, five baits of crushed gastropods in nylon net bags were installed in these areas. Three samples were taken at 30min intervals, capturing all crabs within a circle of 60cm diameter. Attraction of hermit crabs was tested for four different gastropod baits to verify specificity of the chemical cues. Clibanarius antillensis, Pagurus...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hermit crab; Chemical attraction; Gastropod predation sites; Shell use; Shell condition.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000200018
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Levantamento de Mollusca, Crustacea e Echinodermata associados a Sargassum spp. na Ilha da Queimada Pequena, Estação Ecológica dos Tupiniquins, litoral sul do Estado de São Paulo, Brasil Biota Neotropica
Jacobucci,Giuliano Buzá; Güth,Arthur Ziggiatti; Turra,Alexander; Magalhães,Cláudia Alves de; Denadai,Márcia Regina; Chaves,André Murtinho Ribeiro; Souza,Estevão Carino Fernandes de.
Neste trabalho foi realizado o primeiro levantamento da macrofauna de fital da ilha da Queimada Pequena, focalizando o registro das espécies de moluscos, crustáceos e equinodermos associados a Sargassum spp. Para a amostragem da macrofauna associada, foram coletadas aleatoriamente 6 frondes de Sargassum localizadas a 6 m de profundidade, usando-se equipamento de mergulho autônomo. As frondes foram envolvidas em sacos de tecido com malha de 200 mm, mraspadas do substrato, colocadas em recipientes com uma solução de formaldeído 10% e levadas ao laboratório para remoção e identificação da fauna. Quarenta e um táxons foram identificados, havendo dominância de crustáceos peracáridos. Em relação aos Mollusca, a composição específica foi diferente em relação...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fital; Macrofauna; Sargassum; Levantamento marinho; Queimada Pequena.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032006000200023
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Life history of three catfish species (Siluriformes: Ariidae) from southeastern Brazil Biota Neotropica
Denadai,Márcia Regina; Bessa,Eduardo; Santos,Flávia Borges; Fernandez,Wellington Silva; Santos,Fernanda Motta da Costa; Feijó,Mônica Malagutti; Arcuri,Andreza Cristina Dias; Turra,Alexander.
This study evaluated the spatio-temporal distribution, reproduction and diet of the catfishes Genidens genidens, G. barbus and Aspistor luniscutis in Caraguatatuba Bay. Their sizes were recorded and the sex and reproductive stage identified. The abundance was compared between areas (South and North) and among months (August 2003 - October 2004). The species had different spatial distributions, allowing them to coexist. The temporal distribution reflected their tendencies to migrate in the reproductive period, as evidenced by the dominance of small immature individuals in the bay. G. genidens tended to reproduce in winter, and A. luniscutis in spring. The diet of G. genidens consisted of crustaceans, mollusks (shells), fish scales, ostracods, and bivalve...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Spatio-temporal distribution; Diet; Genidens genidens; Genidens barbus; Aspistor luniscutis; Caraguatatuba Bay.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032012000400008
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Population biology of the hermit crab Petrochirus diogenes (Linnaeus) (Crustacea, Decapoda) in Southern Brazil Zoologia
Turra,Alexander; Branco,Joaquim Olinto; Souto,Flávio Xavier.
The aim of this study was to provide information on the biology of a subtropical population ofthe hermit crab Petrochirus diogenes focusing size structure, sex ratio, reproductive period and morphometric relationships. Monthly samples were done between January and December 1995 at Armação of Itapocoroy, Penha, southern Brazil, using two over-trawls in depths from 6.0 to 10.0 m. A total of 126 individuais were collected. Overall sex ratio did not differ from 1:1. When the sex ratio was analyzed for each size class, it was skewed for females in the smallest size classes while males outnumbered females in the largest ones. The mean size (cephalothoracic length) of P. diogenes was 30.61 ± 12.52 mm and the size structure of this population was skewed to the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Size distribution; Population structure; Sex ratio; Morphometric relationships; Reproductive activity.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000400008
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Reproductive behavior of intertidal hermit crabs (Decapoda, Anomura) in southeastern Brazil Zoologia
Turra,Alexander.
The reproductive behavior of four intertidal hermit crab species [Clibanarius antillensis Stimpson, 1859, C. sclopetarius (Herbst, 1796), C. vittatus (Bosc, 1802), and Pagurus criniticornis (Dana, 1852)] was studied in São Sebastião Channel, southeastern Brazil. The overall behavior followed previous descriptions for Diogenid and Pagurid hermit crabs but some particular differences were recorded. Male to male agonistic encounters over females and guarding behavior were more common to C. sclopetarius, C. vittatus, and Pagurus criniticornis. During guarding, males clearly grasped females' chelipeds, eyestalks, and the margins of their shell apertures. This oblique guarding and, simultaneously, accessing behavior (OGAP) has never been described for hermit...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Clibanarius; Pagurus; Courtship; Intersex.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752005000200003
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Structure of molluscan assemblages in sheltered intertidal unconsolidated environments BABT
Denadai,Márcia Regina; Amaral,Antonia Cecilia Zacagnini; Turra,Alexander.
The molluscan macrofauna from 13 oceanic sheltered intertidal unconsolidated environments and its relationship with abiotic factors were studied in order to establish the degree of species richness and to understand the role environment plays in structuring such assemblages. Four distinct intertidal habitat types were recognized based on molluscan assemblage descriptors (diversity, richness and density) and abiotic characteristics. The mean grain size (in phy units) and the beach slope showed a negative relationship with the diversity, richness and density. Coarser sediments were favorable to molluscan fauna in the study areas, contrasting the well-known negative effect of this type of sand on fauna in typical oceanic beaches. The low-tide terraces,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Intertidal; Molluscan assemblage; Beach structure; Environmental heterogeneity.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000600019
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Temporal variation in Sargassum Biomass, Hypnea epiphytism and associated fauna BABT
Leite,Fosca Pedini Pereira; Turra,Alexander.
Studies were carried out to investigate the temporal variation in Sargassum biomass, Hypnea epiphytism and associated fauna. There was a marked variation in the biomass of Sargassum and Hypnea among various sampling periods. Low values for Sargassum were recorded in August and November, while the lower value for Hypnea biomass was recorded in August. An inverse relationship was found between Sargassum biomass and the intensity of Hypnea epiphytism. The density of the total fauna associated to Sargassum showed a marked reduction in May. This variation was influenced by the variation patterns of the dominant faunistic groups (Gastropoda, Gammaridea, Isopoda and Caridea). Significant positive relationships were found between the biomass of Sargassum and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sargassum; Hypnea; Epiphytism; Phytal; Associated fauna.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000400021
Registros recuperados: 10
Primeira ... 1 ... Última
 

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