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Title: Coastal resources exploitation can mask bottom-up mesoscale regulation of intertidal populations
Authors: Tuya, Fernando 
Ramírez Cañada,Rubén 
Sánchez-Jerez, Pablo
Haroun, R. J. 
Ramos, A. G. 
Coca, Josep 
UNESCO Clasification: 240210 Biología de poblaciones
240119 Zoología marina
Keywords: Community regulation
Spatial patterns
Intertidal populations
Grazing molluscs, et al
Issue Date: 2006
Journal: Hydrobiologia 
Abstract: We describe the spatial distribution patterns of rocky intertidal Patella spp. limpets (heavily collected by shellfishers) and top-shell snails belonging to the genus Osilinus (comparatively slightly harvested) through a multiscaled sampling design spanning five orders of magnitude of spatial variability (from 10s of m to 100s of km) throughout the Canarian Archipelago (eastern Atlantic); where rocky intertidal assemblages on opposite sides of the Archipelago (western vs. eastern islands) are subjected to different regimes of bottom-up effects, as large spatial variation in oceanographic conditions is recorded across an east–west gradient. We tested the hypothesis that the response of rocky intertidal populations to mesoscale oceanographic bottom-up variability (quantified using differences in Chlorophyll-a concentration among islands as an approximation to bottom-up effects) depends on the exploitation status of coastal resources, by means of a correlative approach. Our study represent another case in which mesoscale shore-associated physical processes seem to be correlated to large-scale differences (variability among islands, 10s to 100s of km apart) in the abundance of slightly harvested intertidal grazers (topshell snails). In contrast, we did not observe large-scale spatial differences for heavily collected grazers (limpets). In conclusion, our study suggests that the signal of bottom-up processes in coastal populations may be difficult to demonstrate under intense human exploitation.
ISSN: 0018-8158
DOI: 10.1007/s10750-005-1246-6
Source: Hydrobiologia [ISSN 0018-8158], v. 553, p. 337-344 (Enero 2006)
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