Large-scale patterns of encapsulated embryo development and causal factors determining developmental success in the marine environment have been relevant issues research for decades. We studied embryonic intracapsular oxygen availability Trophon geversianus egg capsules from northern Patagonia (Golfo Nuevo, Argentina). The had a mean duration 112 days (at 12–14°C). initial number eggs per capsule was 197 (mean diameter 270 µm), but on average only four embryos reached juvenile stage. Embryos...

Abstract Cases of imposex were clearly identified in Adelomelon brasiliana living the Mar del Plata (Argentina) coastal area; percentages as high 50.0% determined among samples studied. These first reported cases ocurrence this type gastropod. Since is one known tributyltin (TBTs) effects, and no previous reports determination TBTs gastropods eggs found, methods developed for speciation quantitative organotins A. egg capsules. Determination collected area showed contents chloride (TBT) 400...

Seasonality of reproduction in Buccinanops cochlidium, including mating, oviposition and embryonic development, was studied within a population Patagonia. Mating observed mainly during autumn winter (March to October). Females carrying egg capsules were found between July October when water temperature 10°C, while development embryos continued until February (the hatching peak) 18°C. All capsule masses attached the shells females 80–102 mm length. The spawn consisted 80 238 capsules,...

Parasitic castration of Buccinanops cochlidium from San José Gulf, Argentina, caused by a lepocreadiid digenean, is reported for the first time. Rediae and ophtalmotrichocercous cercariae probably belonging to Opechona sp. were identified in gonad digestive gland. has been previously parasitizing B. monilifer northern locality Argentine Sea. Overall prevalence infection was 15.5%; it varied seasonally, rising during warm months after host oviposition period. Cercariae expelled at same time...

Among gastropods, dimorphism is reported in shell size, radular characteristic, and to a lesser extent shape. The relationship of dimorphic characters the with spawning scarcely studied literature. Buccinanops globulosus an interesting model study sexual shape, because adults attach their egg capsules females’ own shells (callus zone). Our hypothesis that evidenced form (size shape) callus zones females' shells, compared males'. In order test this we use 3D geometric morphometrics (GM)...

Predatory strategies used by carnivorous gastropods may change during their ontogeny. In muricid attack mechanisms include an accessory boring organ (ABO), radula, labral tooth and/or pedal muscle. However, these and patterns of use in relation to the ontogeny gastropod remain uncertain. We studied occurrence shifts predatory through Acanthina monodon preying on mytilid Perumytilus purpuratus. Our results showed a direct relationship between predator prey size. During attack, small-sized...

Buccinanops globulosus mated all year round, with higher frequency from May to September, prior spawning months. Gravid females were found between October and March. Oviposition peaked during rising temperatures longest daylength while hatching high water temperature declining daylength. measured 20 41 mm in shell length. The spawn consisted on average of 31 egg capsules, each containing 1266 eggs. Embryos usually completed development within capsule by ingesting small fragments the...

The reproductive biology of a population the edible muricid Trophon geversianus inhabiting an intertidal rocky shore in Golfo Nuevo (Chubut, Argentina) was studied regarding seasonality oviposition and induction under laboratory conditions. Sex ratio differed from 1:1 (female biased). mean shell length 22 mm for males 24 females, although females presented significantly larger maximum sizes. No external sexual dimorphism evident, whereas female snails internally by presence albumin capsule...

AB Aquatic Biology Contact the journal Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 17:261-268 (2012) - DOI: https://doi.org/10.3354/ab00480 Diet and feeding of nassariid Buccinanops cochlidium from northern Patagonia, Argentina Andres Averbuj1,*, Gabriela Palomo2, Martín I. Brogger2, Pablo E. Penchaszadeh2 1LARBIM Centro Nacional Patagónico-CONICET, Puerto Madryn U9120ACD, Chubut, 2Museo Argentino de Ciencias...

Active predators obtain energy and nutrients from prey through complex processes in which the gained must exceed invested finding ingesting prey. In addition, amount of available will vary with that are selected for consumption. The muricid gastropod Acanthina monodon inhabits rocky shores, where it routinely feeds on mytilids Semimytilus algosus Perumytilus purpuratus. this study, S. was highly preferred by predator (over 90% were eaten) versus P. purpuratus (only 9% when offered a mixed...

The populations of Buccinanops monilifer (Gastropoda: Nassariidae) from two different sites, Mar del Plata (Buenos Aires province) and a close non-polluted locality (Mar Chiquita), are compared in their imposex indices reproductive parameters. In Plata, beach nourishment (sand filling) remobilized sediment the harbour area during 1999; our results show high percentage an increase relative penis size index after this filling event, contrast with Chiquita population that showed nil values...

This study provides information about the reproductive cycle of invasive side-gilled sea slug Pleurobranchaea maculata , currently widely distributed along Argentine coast. The histological analysis this simultaneous hermaphrodite showed characteristics a semelparous species with an annual life cycle. highest spermatogenic and oogenic activity was observed from August to January. Partial evacuations mature oocytes, measuring over 100 μm in average diameter, occurred continuously during long...

El objetivo de este trabajo fue estudiar parámetros reproductivos y desarrollo imposex en el caenogasterópodo Buccinanops globulosus que habita una zona portuaria alto tráfico marítimo con presencia contaminantes. Los resultados mostraron mayor incidencia hembras sin ovicápsulas ovicápsulas. Entre las imposex, del pene significativamente aquellas (3.4 mm) (1.5 mm). En B. comúnmente un solo juvenil eclosiona por cada cápsula, embargo, estudio se registraron capsulas múltiples embriones. Todos...

High densities of the invasive sea slug, Pleurobranchaea maculata, have been detected on Argentinean coast, but studies species' adaptation absent until now. Stomach contents P. maculata in two sampling sites located at Golfo Nuevo, Patagonia Argentina, revealed animals as a major prey, surprisingly algae ingestion both was abundant. This fact not reported previous that described opportunistic carnivorous feeding habits species belonging to genus Pleurobranchaea. Significant differences prey...

Naticids are common predators in sandy bottoms of shallow waters around the world. Probably due to their infaunal habitat, they hard find alive, particularly Patagonian Argentina. Nevertheless, presence is confirmed by typical predation boreholes that can be seen on bivalve prey along coast (e.g., Bromley, 1981; Carriker, Pastorino & Ivanov, 1996; Signorelli et al., 2006). These record information without actually seeing them. Paleontologists have exploited this field, analyzing behavior and...

The reproductive biology of the nassariid Buccinanops paytensis is considered and compared with other species in genus. In B. an average 42 egg capsules were attached to shell each female. A mean 2738 eggs (246 µm diameter) occurred per capsule generally only one embryo developed inside, measuring c. 5 mm length when hatching; at pre-hatching stage are still abundant. Four percent contained two embryos unequal size, which nurse totally consumed. 'Larval kidneys' recorded advanced...

Age determination in gastropods is an essential tool for understanding the main aspects of population dynamics that allow formation fisheries policies. Small-scale nassariid gastropod Buccinanops globulosus from northern Patagonia are not yet regulated, although it locally consumed while incipient commercialization taking place. The aim this study was to show suitability opercula readings age estimation B. globulosus, compared with shell marks, previously validated by analysis stable isotope...