Temporal variability in abundance of the sea urchins Paracentrotus lividus and Arbacia lixula in the northwestern Mediterranean: comparison between a marine reserve and an unprotected area

@article{Sala1998TemporalVI,
  title={Temporal variability in abundance of the sea urchins Paracentrotus lividus and Arbacia lixula in the northwestern Mediterranean: comparison between a marine reserve and an unprotected area},
  author={Enric Sala and Marta Ribes and Bernat Hereu and Mikel Zabala and Victor A. Alva and Rafael Coma and Joaquim Garrabou},
  journal={Marine Ecology Progress Series},
  year={1998},
  volume={168},
  pages={135-145}
}
Sea urchin populations were monitored in the Medes Islands Marine Reserve (NW Mediterranean) and an adjacent unprotected area in order to (1) describe temporal variability in abundance and population size-structure of sea urchins within each area (from 1991 to 1997), and (2) to compare these areas to investigate the role of fish predation level in determining sea urchin population structure over time (from 1995 to 1997). Abundance of the sea urchin Paracentrotus lividus (Lamarck) was monitored… Expand
Movement patterns of the sea urchin Paracentrotus lividus in a marine reserve and an unprotected area in the NW Mediterranean
TLDR
The results underline the role of predatory fishes in reducing herbivory pressure by trophic cascades, reinforcing the evidence that sea urchin escape behaviour may be an important factor in structuring algal communities. Expand
Temporal variability in abundance and population structure of the edible sea urchin Paracentrotus lividus in relation to harvesting: A case study in the intertidal zone of Aoufist (SW Morocco, Atlantic Ocean)
The sea urchin (Paracentrotus lividus) fishery was investigated in the shallow rocky shore of Aoufist (SW Morocco, Atlantic Sea), heavily impacted by the harvesting activities. Test diameter, biomassExpand
The impact of commercial and recreational harvesting for Paracentrotus lividus on shallow rocky reef sea urchin communities in North-western Sardinia, Italy
TLDR
The results reveal the existence of a heavy fishing impact on P. lividus in North-western Sardinia and the need for regulation of its harvesting to prevent severe direct effects on its populations. Expand
Multiple Processes Regulate Long-Term Population Dynamics of Sea Urchins on Mediterranean Rocky Reefs
We annually monitored the abundance and size structure of herbivorous sea urchin populations (Paracentrotus lividus and Arbacia lixula) inside and outside a marine reserve in the NorthwesternExpand
Inter- and intra-specific competition between Paracentrotus lividus and Arbacia lixula in resource-limited barren areas
TLDR
It is highlighted that in barren conditions a large trophic niche differentiation occurs, demonstrating that the two urchins play complementary and synergic roles in the maintenance of barrens in the Mediterranean. Expand
Investigating on the occurrence of Paracentrotus lividus in rocky and Posidonia oceanica habitat
TLDR
Data collected suggest that the abundance of adults in the seagrass is probably sustained by immigration from the rocky habitat, while in Posidonia oceanica habitat a lower density and a higher size were found rather than in rocky habitat. Expand
Settlement and recruitment of the sea urchin Paracentrotus lividus in two contrasting habitats in the Mediterranean
TLDR
The population in the seagrass meadow appears to be recruitment-limited and probably mainly sustained by immigration, while settlement and recruitment appear to determine, to a certain extent, adult population structure and dynamics on the rock wall. Expand
Patterns of variation of intertidal species of commercial interest in the Parque Litoral Norte (north Portugal) MPA: comparison with three reference shores.
TLDR
Results did not generally support a predictable direct effect of protection, as the total abundance and the abundance of larger individuals of both species and GI did not differ between the MPA and reference shores, but a considerable temporal and spatial variability at smaller scales was detected for several response variables. Expand
A first approach to stock assessment of the sea urchin Paracentrotus lividus (Lamarck, 1816) in Cantabria (Bay of Biscay)
TLDR
The high sea urchin densities together with the high percentages of commercial individuals suggest that the resource is currently underexploited, and precautionary measures should be adopted before opening the fishery. Expand
Multiple effects of harvesting on populations of the purple sea urchin paracentrotus lividus in north Portugal
TLDR
It is suggested that commercial harvesting has an actual impact on the studied populations of P. lividus, with potential implications for their conservation and for the management of the associated local fishery. Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 33 REFERENCES
Fish predation and the structure of the sea urchin Paracentrotus lividus populations in the NW Mediterranean
Large differences in the sea urchin Paracentrotus lividus (Lamarck) population structure have been observed in the NW Mediterranean. Differences have been attributed to removal of predatory fishExpand
Patterns of Activity of the Sea Urchin Paracentrotus lividus in the Bay of Port‐Cros (Var, France, Mediterranean)
TLDR
Urchins seem to stay in a quite small area, at least for some months, and the activity is negatively correlated with the mean wind speed; during a period of turbulence lasting several hours, movement was significantly oriented to the deep. Expand
Low densities of sea urchins influence the structure of algal assemblages in the western Mediterranean
TLDR
It is concluded that grazing by P. lividus exerts a significant effect on habitat structure, even in communities with low sea urchin densities, such as those found in vast areas of the Mediterranean sublittoral. Expand
Growth and population structure of Paracentrotus lividus (Echinodermata:Echinoidea) in two contrasting habitats
TLDR
It is suggested that different dynamics underlle both populations, the one at the unstable site being driven primarily by episodic storms, which cause high mortalitles but carry new individuals to the site and features a lower and more predictable mortality which allows for the development of a well-structured population. Expand
Sea Urchins in the Saint Lawrence Estuary: Their Abundance, Size-Structure, and Suitability for Commercial Exploitation
Quantitative transects were made at nine locations along the Saint Lawrence Estuary, Quebec, to examine changes in the abundance and size-structure of populations of the green sea urchin,Expand
Population regulation of the rock-boring sea urchin Echinometra mathaei (de Blainville)
TLDR
Comparisons with individuals starved in aquaria indicate that these are responses to reduced food availability, and there was no indication that larger individuals were able to avoid resource limitations more effectively than small individuals with increasing population density. Expand
Are the Mediterranean waters becoming warmer? Information from biological indicators
The authors are biologists specializing in benthos or ichthyofauna survey. They have worked in marine protected areas or in other littoral zones of the Mediterranean Sea for a long time. The use ofExpand
Status of Kenyan Coral Reefs
The existence of four marine parks and numerous reefs experiencing intense human resource use has provided the opportunity for a number of studies that have helped increase the understanding of humanExpand
Fishing, trophic cascades, and the structure of algal assemblages : evaluation of an old but untested paradigm
TLDR
It is argued that other processes trecruitment, pollution, disease, large-scale oceanographic events, sea urchin harvesting, food subsidies, and availability of shelters) may also be important in regulating the structure of Mediterranean algal assemblages. Expand
A Mediterranean rocky-bottom ecosystem fisheries model
TLDR
An aggregated energy-based simulation model of the Mediterranean infralittoral rocky-bottom was developed and used to carry out fishing experiments where fishing intensity and catch selection were varied, suggesting that fishing affects the ecosystem's ecology and the benefits of fishing yields must be weighed against changes in the benthic ecology. Expand
...
1
2
3
4
...