Interaccion trofica entre dos estrellas de mar (Astropecten riensis y Tethyaster vestitus) en Golfo Triste, Venezuela

This research has been done on the basis of samples obtained at depths between 21 and 63m by trawling in Golfo Triste. The stomach content of 153 specimens of Tethyaster vestitus and 981 specimens of Astiopecten riensis were analyzed. A.riensis seems to be an important element within the trophic structure of the community under study, constituting the second and third level of consumers. T.verstitus is, within the above-mentioned community one of the rare constitiuents of the 4th level consumers despite the fact that it takes part in the 3rd level as well

Reproductive Output and Seasonality of Limnoperna fortunei

Fil: Boltovskoy, Demetrio. Instituto de Ecología. Genética y Evolución de Buenos Aires (IEGEBA). Universidad de Buenos Aires; ArgentinaFil: Morton, Brian. School of Biological Sciences. University of Hong Kong; ChinaFil: Correa, Nancy. Servicio de Hidrografía Naval. Ministerio de Defensa. Escuela de Ciencias del Mar. Instituto Universitario Naval; ArgentinaFil: Cataldo, Daniel. Departamento de Ciencias Biológicas. Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires; ArgentinaFil: Damborenea, María Cristina. División Zoología Invertebrados. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Penchaszadeh, Pablo E.. Museo Argentino de Ciencias Naturales Bernardino Rivadavia; ArgentinaFil: Sylvester, Francisco. Instituto para el Estudio de la Biodiversidad de Invertebrados. Facultad de Ciencias Naturales. Universidad Nacional de Salta; Argentin

Reproductive Output and Seasonality of <i>Limnoperna fortunei</i>

Young Limnoperna fortunei mature sexually from 5–6 to ~15 mm. The species is generally dioecious, with approximately equal numbers of males and females and very small (3, but, normally, values range around 6000 ind./m3, showing major fluctuations within short periods, as well as changes as a function of time elapsed post colonization, and availability of substrata suitable for adult occupation. Microcystin-producing cyanobacterial blooms can kill L. fortunei larvae.Facultad de Ciencias Naturales y Muse

Spawn characteristics in Adelomelon ferussacii (Donovan, 1824) (Gastropoda: Volutidae) from southern Patagonia, Argentina

Volume: 123Start Page: 172End Page: 17

Redescription of Hiatella meridionalis d'Orbigny, 1846 (Mollusca, Bivalvia, Hiatellidae) from Argentina

The redescription of Hiatella meridionalis (d’Orbigny, 1846) is provided as first attempt to improve the systematics of the genus in the regions of Atlantic and western Pacific. This reanalysis is based on specimens collected in the vicinity of the type localities and is based on detailed morphology of samples that some researches consider a single, wide ranging species. From the morphological characters, the more interesting are: a high quantity of papillae at incurrent siphon; the retractor muscles of siphon divided in two bundles; the small size of the palps; the muscular ring in the stomach; and the zigzag fashion of the short intestinal loops. These characters distinguish the species from the other hiatellids so far examined. Type material of the species was examined, by first time illustrated, and the lectotype is designated.A redescrição de Hiatella meridionalis (d’Orbigny, 1846) é realizada como primeiro passo na melhoria da sistemática do gênero das regiões atlântica e pacífica oeste. Esta re-análise é baseada em espécimes coletados nas vizinhanças da localidade tipo e em morfologia detalhada de amostras que alguns pesquisadores consideram pertencer a uma única espécie de ampla distribuição. Dos caracteres anatômicos, os mais interessantes são: uma grande quantidade de papilas no sifão inalante; o músculo retrator dos sifões dividido em duas porções; o tamanho pequeno dos palpos; um anel muscular transversal no estomago; e um padrão em zigzag no curto intestino. Estes caracteres distinguem a espécie dos demais hiatelídeos até então examinados. Os sintipos da espécie foram também examinados e pela primeira vez ilustrados; o lectótipo é designado.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Universidad de Buenos Aire