We performed the modularity analysis on the yearly larval connectivity matrices produced by these simulations, and analyzed the changes of modularity and the formation of modules over time as indicators of spatial structure.
The analysis revealed a strong modular spatial structure for abalone and a weak spatial signature for sea urchin. In abalone, under exploitation, modularity takes step-wise drops on the path to extinction, and modules breakdown into smaller fragments followed by module and later metapopulation collapse. In contrast, sea urchin showed high modularity variation, indicating high- and low-mixing years, but an abrupt collapse of the metapopulation under strong exploitation.
The results identify a disruption in larval connectivity and a pattern of collapse in highly modular nearshore metapopulations. These results highlight the ability of modularity to detect spatial structure in marine metapopulations, which varies among species, and to show early changes in the spatial structure of exploited metapopulations.
Metapopulation - Wikipedia
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- The Abundance of the Elements in Relation to the Hydrogen-Helium Structure of the Atoms!
- Marine Metapopulations - Benham - - Marine Ecology - Wiley Online Library.
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- The Divided West.
Marine researchers, natural resource managers, marine and terrestrial ecologists, and graduate students. Highly recommended. Upper-level undergraduates and above.
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