1,721,034 research outputs found
Effets de l’envhaissement des Rhodophyceae introduites Acrothamnion preissii et Womersleyella setacea sur les communautés algales des herbiers à Posidonia oceanica de la Méditerranée occidentale
No full textThe distribution and dominance of two introduced turf-forming macroalgae in the coast of Tuscany (Italy, northwestern Mediterranean) in relation to different habitats and sedimentation
No full textThe Role of vegetative fragmentation in dispersal of the invasive alga Caulerpa taxifolia in the Mediterranean
Full text linkThis study evaluated the importance of fragmentation in the recruitment of the fast-spreading, introduced green alga Caulerpa taxifolia at the margins of beds of the seagrass Posidonia oceanica. A multifactorial experiment was designed to test the hypotheses that there are seasonal differences in patterns of establishment of vegetative fragments, whether this process changes with depth and whether these patterns were consistent at different spatial and temporal scales. Our experimental approach consisted of dispersing drifting fragments of C. taxifolia along the margin of a bed of P. oceanica and recording the number of fragments established after 1 mo. The results show that a surprisingly large number of fragments become established in this habitat and that numbers varied in space and time: the probability of establishment of fragments was greatest during summer especially at the shallow sites, but smaller in spring and smallest in winter. Differences among areas were also found: a great variability in establishment of fragments depended on the site and time within season. Results indicate that dispersal by fragmentation can greatly contribute to a very wide spread of the alga in the Mediterranean. We predict that spread will be greatest during summer when a large proportion of fragments can re-attach to the substratum, even at shallow sites. Such information is important for the understanding of the ecology of this species and, with the help of hydrographic studies, in the prediction of its patterns of geographic dispersal
EFFECTS OF CANOPY COVER, HERBIVORES AND SUBSTRATUM TYPE ON PATTERNS OF CYSTOSEIRA SPP SETTLEMENT AND RECRUITMENT IN LITTORAL ROCKPOOLS
No full textEARLY PATTERNS OF ALGAL SUCCESSION IN A MIDLITTORAL COMMUNITY OF THE MEDITERRANEAN-SEA - A MULTIFACTORIAL EXPERIMENT
No full textSpatial distribution of algae and invertebrates in the rocky intertidal zone of the Strait of Magellan: are patterns general?
No full textCANOPY REMOVAL EXPERIMENTS IN CYSTOSEIRA-DOMINATED ROCKPOOLS FROM THE WESTERN COAST OF THE MEDITERRANEAN (LIGURIAN SEA)
No full textRECOVERY OF PATCHES IN AN ASSEMBLAGE OF GENICULATE CORALLINE ALGAE - VARIABILITY AT DIFFERENT SUCCESSIONAL STAGES
No full textHABITAT HETEROGENEITY, SEA-URCHIN GRAZING AND THE DISTRIBUTION OF ALGAE IN LITTORAL ROCK POOLS ON THE WEST-COAST OF ITALY (WESTERN MEDITERRANEAN)
No full textPatterns of disturbance and recovery in littoral rock pools: nonhierarchical competition and spatial variability in secondary succession
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