Distribución geográfica y abundancia periférica de Imantodes cenchoa (Serpentes: Dispadidae) sugieren una inversión de los patrones biogeográficos clásicos
Palabras clave:
Abundant Centre Hypothesis, Common Blunt-headed Snake, Paraguay, Neotropics, Rare Edge HypothesisResumen
The Rare Edge Hypothesis (REH) proposes that species are less abundant at the margins of their geographic ranges. This study assessed the geographical distribution and relative abundance patterns of Imantodes cenchoa in South America by integrating ecological niche modeling (MaxEnt) and generalized additive models (GAM). MaxEnt highlighted regions of high environmental suitability, particularly in Amazonian and Atlantic forest areas, while the GAM results indicated that suitability does not always correspond to higher relative abundance. Some regions with high predicted suitability, such as the southwestern Amazon moist forests, showed neutral or negative effects on abundance. Conversely, some marginal areas revealed unexpectedly positive
abundance values. These findings suggest that unmodeled variables, such as canopy structure or anthropogenic disturbance, may influence local population densities. By combining both approaches, we identified ecoregions with overlooked conservation potential and emphasized the need to go beyond suitability alone when assessing species viability. The observed spatial patterns do not fully support either the Abundant-Center Hypothesis or the Rarity-at-the-Edges Hypothesis, pointing instead to a more complex distribution of abundance.
Citas
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Derechos de autor 2026 Pier Cacciali, Danilo Krause
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