1000 resultados para Milne-Edwards, Henri (1800-1885) -- Portraits
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Mode of access: Internet.
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Mode of access: Internet.
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Mode of access: Internet.
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Texto a dos col.
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Mode of access: Internet.
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Mode of access: Internet.
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No more published.
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Mode of access: Internet.
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Mode of access: Internet.
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"Vers intestinaux," v. 3, edited by Nordmann; "Echinodermes" and "Tuniciers," v. 3, edited by F. Dujardin.
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Mode of access: Internet.
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ptie. 1. Introduction. Anatomie et physiologie. -- [ptie. 2] Mammiféres. -- [ptie. 3] Oiseaux. Reptiles. Poissons. -- [ptie. 4] Animaux sans vertèbres.
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The family Alpheidae, composed by shrimps of relatively small size, popularly known as snapping shrimps, is the one of the most diverse decapod groups. These shrimps are found worldwide and Occur in tropical and subtropical waters, from the intertidal zone to great depths. We investigated reproductive aspects of Alpheus armillatus, in order to gather information on egg production, aiming to enhance knowledge of its reproductive strategies in a population in an intertidal area of the South Atlantic. Ovigerous females were collected under rocks, in May and July 2006 (dry season) and in November 2006 and March 2007 (rainy season). Egg production and reproductive output were analyzed and compared seasonally and during the period of embryonic development. Females measured on average 11.28 mm CL with a mean of 763 eggs and 0.11 mm(3) egg volume. The egg volume of this population was smaller than previous estimates for other species of snapping shrimps, but the mean egg number was higher. The volume of eggs doubled during the incubation period, but despite this increase, no significant loss of eggs was observed. Alpheus armillatus invests oil average about 12% of body weight in reproduction. The proportional investment in egg production IS Significantly higher in the rainy season when compared with the dry season (17.9% vs 4.8%), correlated with higher temperatures and increased food availability at this time. Our results corroborated the hypothesis of a pattern of egg production influenced by environmental conditions and intraspecific variability among the family Alpheidae, as a function of the biogeographic region.
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The occurence of Fredius reflexifrons (Ortmann, 1897), a pseudothelphusid crab widely distributed in the Amazon region and the Atlantic Guianas, is recorded from the state of Ceará, northeastern Brazil. Other records of this species and Fredius denticulatus (H. Milne-Edwards, 1853) from the Amazon region are also presented. A discussion is made on the eastern limits of the distribution of the family Pseudothelphusidae in Brazil.