Intertidal occurrence of the sea urchin Pseudechinus magellanicus (Temnopleuridae) along the coasts of Argentina and southern Chile
Palabras clave:
Echinodermata, Echinoidea, intertidal, distributionResumen
The study aimed to assess the coastal distribution of the widespread sea urchin Pseudechinus magellanicus along the southwestern Atlantic coast, focusing on its occurrence in the intertidal zone and explore its relationship with environmental factors. Data was collected in intertidal rocky shores across 36 sites along the Argentine and Chilean coasts during 2007 and 2010. The presence of P. magellanicus was verified in the intertidal zone on rocky coasts of Argentina between latitudes 45°S and 55°S, most frequently in the central area of the San Jorge Gulf, the Strait of Magellan, and the Beagle Channel. A fragmented coastal distribution is observed with the absence of the species in the intertidal zone between latitudes 47.2°S (Cape Blanco) and 54°S (Cape San Pablo). Logistic regression analysis and regression and classification trees (CART) suggest that higher water transparency and lower levels of dissolved chromatic organic matter in nearshore waters could explain its presence on intertidal platforms. Furthermore, in sites with high wave exposure, the likelihood of finding P. magellanicus increases rapidly only in sites with higher water transparency, while this increase is slower in sites with low transparency values. Establishing baseline data on the coastal distribution of these species is crucial for monitoring and evaluating the impacts of environmental shifts in the context of climate change and increasing human activity in coastal habitats.
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