Distribution Patterns of Scarabaeoidea: A Biogeographical Regionalization Proposal for El Salvador

Abstract

Aim To conduct a biogeographical regionalization of El Salvador, based on the potential distribution patterns of the superfamily Scarabaeoidea and using Parsimony Analysis of Endemicity. Location El Salvador, Central America. Taxon Superfamily Scarabaeoidea (Insecta: Coleoptera). Methods Potential distribution models were developed for 160 species using Maxent. Based on the resulting potential richness patterns, a Parsimony Analysis of Endemicity was performed using hexagonal grids of 50 km 2 across El Salvador. Clades of cells sharing species compositions (geographical synapomorphies) were identified, and the regions corresponding to each clade were delineated. Results Five clades were identified, corresponding to the following biogeographic regions: (1) Pacific Lowlands; (2) Eastern Interior Valley; (3) Chortis Volcanic Front (Central American Volcanic Arc); (4) Western Interior Valley; (5) Northern Mountains. Main Conclusions Species distribution models, combined with parsimony analyses, strengthen the versatility of both methods for identifying biogeographical patterns at finer spatial scales, facilitate the first species‐based biogeographic regionalization of El Salvador, and demonstrate that micro‐scale analyses can reveal internal structure within broadly defined Central American provinces.

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