1,721,337 research outputs found
ANTAGONISMO, COOPERAZIONE E BIODIVERSITÁ
No full textDirect and indirect biotic interactions driving community structure, can be positive,
increasing the fitness of both partners, or negative, often increasing the fitness of only one of the
participant to the interaction. Moreover, partner interaction may produce an integration among them,
thus giving rise to an association defined as symbiosis, with parasitism and mutualism as the two extremes
of a symbiotic continuum. In the past, negative interactions have been considered more widespread within
communities and responsible for most of their structures. They have also been studied by an experimental
approach. By contrast, cooperative interactions have mainly approached with a descriptive aspect.
Negative interactions are more abundant in benign environments, whilst positive ones develop according
to the environmental harshness with different organisms cooperating to cope environmental stress.
Both parasitism and mutualism can evolve from a commensal interaction depending from the
ecological context and have a different role in promoting evolution. In turn commensalism can evolve from
epibiosis, a widespread phenomenon in marine benthic environment where the high spatial competition
promotes the overgrowth of organisms. Therefore epibiosis is the starting point for further evolution
of different kind of interactions. We describe some examples of mutualisms in marine environment,
underlining how such interactions can lead to the increase of biodiversity
Delectona ciconiae n. sp. (Porifera, Demospongiae) boring into the scleraxis of Corallium rubrum
No full textOn two Eudendrium (Cnidaria, Hydrozoa) species from the Mediterranean Sea
Full text linkTwo species referable to the genus Eudendrium Ehrenberg are recorded from the central Mediterranean Sea. Eudendrium merulum is reported for the jirst time outside
Australia, whereas Eudendrium carneum is recorded for the second time from Mediterranean
waters. The structure of the nematocysts of E. merulum is elucidated by SEM analyses and the mechanism of penetration is compared to that of other hydroid
Medium-term effects of die-off of rocky benthos in the Ligurian Sea. What can we learn from gorgonians?
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CIRCANNUAL CYCLE AND OXYGEN-CONSUMPTION IN EUDENDRIUM-GLOMERATUM (CNIDARIA, ANTHOMEDUSAE) - STUDIES ON A SHALLOW-WATER POPULATION
No full textDistribuzione geografica delle principali specie di spugne presenti nel coralligeno del Mar Mediterrane.
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