Consulta: subjectFacets:"Ophiuroid"
Registros recuperados: 6
Data/hora: 09/06/2024 01:48:58

Ophionereis reticulata (Echinodermata, Ophiuroidea)
Provedor de dados: 76
Autores: Yokoyama,Leonardo Q.; Amaral,Antonia Cecília Z.
This study compared the arm regeneration frequencies in two different populations of Ophionereis reticulata (Say, 1825) in São Sebastião, Southeast Brazil and observed arm regeneration between age classes (juvenile and adults) and sexes (male and female). From the 1,170 individuals sampled, 1,089 (92.2%) showed signs of arm regeneration. The relative frequencies of regenerating arms in the two areas were not different (Baleeiro Isthmus: 91.3% and Grande Beach: 99.5%). Both areas also presented similar values for the number of arms regenerating/individual and in the frequency of regenerating individuals. The major part of the regenerating scars was concentrated in the distal portion of the arm. Sub-lethal predation is most likely the cause to the high rates...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ophiuroid; Arm regeneration; Sub-lethal predation; Brazil.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212010000200006

Calcium carbonate production of a dense population of the brittle star Ophiothrix fragilis (Echinodermata : Ophiuroidea): role in the carbon cycle of a temperate coastal ecosystem
Provedor de dados: 5
Autores: Migne, A; Davoult, Dominique; Gattuso, Jp.
The production of calcium carbonate by a dense Ophiothrix fragilis population was calculated in order to investigate its role in the carbon budget of a temperate coastal ecosystem (Dover Strait, eastern English Channel). Production, calculated using monthly data of population density, demographic structure and a size/CaCO3 conversion, was 682 g CaCO3 m(-2) yr(-1). Assuming that the molar ratio of CO2 released to CaCO3 precipitated varied with temperature between 0.66 and 0.73, this production would result in the release of 4.8 mol CO2 m(-2) yr(-1). This calculation reinforces the suggestion that this coastal system is a source of CO2 to the atmosphere.
Tipo: Text
Palavras-chave: CO2 flux; CaCO3 production; Ophiuroid; Coastal ecosystem; Temperate sea.
Ano: 1998
URL: https://archimer.ifremer.fr/doc/00248/35947/34474.pdf

Collocherides bleptus n. sp. (Copepoda: Siphonostomatoida) associated with an intertidal ophiuroid in Madagascar
Provedor de dados: 16
Autores: Humes, Arthur G.
Collocherides bleptus n. sp. is associated with a brittle star, Macrophiothrix sp., at Nosy Bé, in northwestern Madagascar. The new copepod differs from its two congeners by its larger size and by having leg 5 in the female with an elongate distal segment bearing only two setae.
Tipo: Article / Letter to the editor
Palavras-chave: Copepoda; Siphonostomatoida; Madagascar; Ophiuroid; Associate; Collocherides.
Ano: 1993
URL: http://www.repository.naturalis.nl/record/504649

Gametogenic cycle of Ophioderma januarii, a common Ophiodermatidae (Echinodermata: Ophiuroidea) in southeastern Brazil
Provedor de dados: 103
Autores: Borges,Michela; Yokoyama,Leonardo Q; Amaral,Antonia C. Z.
This study describes the gametogenic cycle of Ophioderma januarii Lütken, 1856, a common species of ophiuroid in Southeastern Brazil. The specimens were collected during the project "Biodiversidade Bêntica Marinha no Estado de São Paulo-BIOTA/FAPESP-Bentos Marinho" (Marine benthic biodiversity in the State of São Paulo-BIOTA/ Fapesp-Marine Benthos) which was conducted off the northern coast of the state of São Paulo. Specimens were captured monthly between February 2001 and December 2002. Due to the low number of individuals the monthly data was grouped in seasons (spring to winter). A total of 101 specimens were obtained: 33 in spring, 10 in summer, 23 in autumn, and 35 in winter. The gonads of eighty-eight individuals (45 females, 42 males, and one...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gametogenesis; Ophiuroid; Recruitment.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000100018

The diet of Ophionereis reticulata (Echinodermata: Ophiuroidea) in southeastern Brazil
Provedor de dados: 104
Autores: Yokoyama,Leonardo Q.; Amaral,Antonia C. Z.
The ophiuroid Ophionereis reticulata (Say, 1825) occurs in the sediment-rocky shore interface, under small stones. Its diet is analyzed in this short communication. Specimens were collected at the Praia Grande beach, located on the northern coast of the state of São Paulo, Brazil, in July, 2002 and January, 2003. The animals were fixed in 70% ethanol and dissected to obtain their stomach contents. Of the total (35), 77.1% (27) had ingested some kind of food and, among those, 81.4% (22) had more than one item. The mean number of food items per stomach was 1.9. Ophionereis reticulata is an omnivorous species, consuming sediment, green and red algae, and polychaetes.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diet; Omnivorous; Ophiuroid.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752008000300029

Deep-water Ophiuroidea (Echinodermata) from off Chile in the Eastern South Pacific
Provedor de dados: 49
Autores: Manso,Cynthia Lara de Castro.
The ophiuroids collected during the Oceanographic Expedition PUCK (SONNE-156) in 2001, in the framework of the project "Interactions between productivity and environment along the Chilean continental shelf" were analyzed. Eight samples had ophiuroids; Fifteen species were distributed in the following families: Gorgonocephalidae (2), Asteronychidae (2), Ophiomyxidae (1), Ophiacanthidae (2), Ophiuridae (5), Amphiuridae (1), and Ophiolepididae (2). Four species were recorded for the first time from Chilean waters, i.e., Asteronyx loveni Müller &amp;amp; Troschel, Astrodia tenuispina Verrill, Ophiolimna bairdi (Lyman), and Ophiocten amitinum Lyman, and three are new, i.e., Ophiura (Ophiuroglypha) arntzi sp. nov., Amphiophiura gallardoi sp. nov., and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ophiuroid; Deep-water; Chilean continental margin; Chilean abyssal zone; Taxonomic diversity.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000200023