Testing the habitat harshness hypothesis: reproductive biology of the wedge clam Donax hanleyanus (Bivalvia: Donacidae) on three Argentinean sandy beaches with contrasting morphodynamics
نویسندگان
چکیده
منابع مشابه
Early ontogeny of the pipi, Donax (Plebidonax) deltoides (Donacidae; Bivalvia)
Reduction in commercial catches of the pipi, Donax (Plebidonax) deltoides, has prompted interest in the potential for hatchery production of pipi juveniles as the basis for reseeding programs and assessments of culture potential. Adult pipis were collected from Port Stephens, New South Wales, Australia, in October/November 2008 and held in baskets in a recirculating holding system. Two consecut...
متن کاملMorphology and Morphodynamics of Sandy Beaches
Contents 1. Introduction 2. Sandy beach morphology 2.1. Primary beach profile 2.2. Secondary morphological features 2.3. Micro-morphology 2.4. Scale and composite morphological features 3. Environmental boundary conditions and external hydrodynamic forcing 3.1. Boundary conditions 3.2. Hydrodynamic forcing 4. Morphological change 4.
متن کاملSurvivorship of juvenile surf clams Donax serra (Bivalvia, Donacidae) exposed to severe hypoxia and hydrogen sulphide
Toxic ‘‘sulphide eruptions’’ sporadically occur in the highly productive inshore regions of the central Namibian Benguela upwelling system. The surf clam Donax serra (Röding, 1798) dominates the intertidal and upper subtidal of large exposed sandy beaches of southern Africa and its recruitment seems to be affected by sulphide events. The reaction of juvenile surf clams to low oxygen concentrati...
متن کاملGrowth and production of Donax striatus (Bivalvia: Donacidae) from Las Balsas beach, Gibara, Cuba.
Clams of the genus Donax are worldwide the dominating group of the invertebrate community on sandy beaches. They are primary consumers that provide a significant abundance and biomass to the ecosystem. In the Caribbean, Donax striatus has an important role for nature and human, nonetheless studies on the population dynamics of this beach clam are scarce and no information exists on secondary pr...
متن کاملsurvey on the rule of the due & hindering relying on the sheikh ansaris ideas
قاعده مقتضی و مانع در متون فقهی کم و بیش مستند احکام قرار گرفته و مورد مناقشه فقهاء و اصولیین می باشد و مشهور معتقند مقتضی و مانع، قاعده نیست بلکه یکی از مسائل ذیل استصحاب است لذا نگارنده بر آن شد تا پیرامون این قاعده پژوهش جامعی انجام دهد. به عقیده ما مقتضی دارای حیثیت مستقلی است و هر گاه می گوییم مقتضی احراز شد یعنی با ماهیت مستقل خودش محرز گشته و قطعا اقتضاء خود را خواهد داشت مانند نکاح که ...
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ژورنال
عنوان ژورنال: Journal of Molluscan Studies
سال: 2009
ISSN: 1464-3766,0260-1230
DOI: 10.1093/mollus/eyp044