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Registros recuperados: 23
Primeira ... 12 ... Última
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Crescimento relativo e determinação da idade na fase juvenil de Armases angustipes (Dana) (Decapoda, Brachyura, Grapsidae) Zoologia
Kowalczuk,Vania G.L.; Masunari,Setuko.
The relative growth of the male chelipod and female abdomen of Armases angustipes (Dana, 1852) was studied in order to determine the carapace size of puberty. Also, the age of juvenile crabs in laboratory was established. A total of 537 males and 557 females were analysed and the transition point between mature and immature stages was determined for both sexes. Males attain maturity at 1.00 cm carapace width and females at 1.08 cm. The relative growth of female abdomen was more remarkable than that of the male chelipod, although both are positive allometric. It suggests a greater importance of a large abdomen in females than a strong chelipod in males. Juvenile crabs reared from megalopa stage has five developmental stages before reaching sexual...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Armases angustipes; Crabs; Relative growth; Age determination.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752000000100002
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Brachyura (Crustacea, Decapoda) associated to Schizoporella unicornis (Bryozoa, Gymnolaemata) in Ubatuba bay (SP), Brazil BABT
Mantelatto,Fernando L. M.; Souza-Carey,Marisa M..
This work characterizes the composition of Brachyura from Schizoporella unicornis. The samples were collected in 1995 at Itaguá Beach, Ubatuba (SP), at three month intervals, during all seasons from January to December. The Bryozoa colonies were obtained by snorkeling at a depth of five meters in daylight. A total of 323 specimens were collected from four families (Xanthidae, Portunidae, Majidae and Grapsidae). Pachygrapsus transversus, Hexapanopeus schimitti, and Menippe nodifrons occurred in all seasons. The highest and lowest number of individuals occurred during the spring and autumn, respectively. Xanthidae exhibited the highest density during the summer, autumn, and spring, while Grapsidae exhibited the highest density in winter. It was noted the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brachyuran; Bryozoan; Check list; Crabs; Schyzoporella.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000200007
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Acute and chronic effects of cadmium on blood homeostasis of an estuarine crab, Chasmagnathus granulata, and the modifying effect of salinity BJMBR
Rodríguez,E.M.; Bigi,R.; Medesani,D.A.; Stella,V.S.; Greco,L.S.L.; Moreno,P.A.R.; Monserrat,J.M.; Pellerano,G.N.; Ansaldo,M..
Whole body oxygen consumption and some hemolymph parameters such as pH, partial pressure of gases, level of ions and lactate were measured in the estuarine crab Chasmagnathus granulata after both acute (96 h) and chronic (2 weeks) exposure to cadmium at concentrations ranging from 0.4 to 6.3 mg/l. In all instances, the crabs developed hemolymph acidosis, but no respiratory (increased PCO2) or lactate increases were evident. Hemolymph levels of sodium and calcium were always increased by cadmium exposure. The chronic toxicity of cadmium was enhanced at 12‰ salinity, even causing a significantly higher mortality in comparison with the higher salinity (30‰) used. A general metabolic arrest took place at 12‰ salinity in the crabs chronically exposed to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cadmium; Crabs; Blood homeostasis; Salinity.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000400011
Registros recuperados: 23
Primeira ... 12 ... Última
 

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