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- Title
Landscape anthropization explains the genetic structure of an endemic Mexican bird (Thryophilus sinaloa: Troglodytidae) across the tropical dry forest biodiversity hotspot.
- Authors
Malpica, Andreia; González, Clementina
- Abstract
Context: Tropical dry forests (TDFs) are one of the richest and also one of the most threatened ecosystems in the world due to anthropization. In Mexico, only a minimal proportion of TDF is conserved in protected areas, typically surrounded by human-modified landscapes. Habitat modification can impact gene flow, affecting the populations' genetic structure, and ultimately, the long-term persistence of natural populations. Objectives: We examined the influence of landscape features on the genetic connectivity of Thryophilus sinaloa, a common and highly territorial TDF-associated bird species. We conducted our study in a Mexican landscape along the Pacific coast characterized by a protected area surrounded by a heterogenous human-modified landscape. Methods: We genotyped 90 individuals from 20 localities at 24,549 SNPs derived from 3RADseq and de novo assembling techniques to examine the relationship between population genetic patterns and landscape features using a resistance surface optimization framework. Results: Populations were genetically structured in two groups across the landscape. An open-areas resistance surface, along with geographic distance, reduced genetic connectivity. This finding suggests that protected areas are partially isolated from TDF fragments and other non-protected areas. Conclusions: Our research highlights the impact of TDF landscape modification by human-induced activities on the genetic connectivity of a common bird. Our study reveals that the only TDF reserve in the region is mostly disconnected from other remnants of non-protected areas of continuous TDF. The increasing deterioration of the habitat could eventually cause a decrease in genetic diversity and effective population size. Moreover, genetic differentiation could be enhanced as habitat patches are more isolated, increasing the likelihood of local extinctions.
- Subjects
SINALOA (Mexico : State); MEXICO; TROPICAL dry forests; ENDEMIC birds; LANDSCAPE assessment; WRENS; FOREST biodiversity; HABITAT modification; ENDANGERED ecosystems; LANDSCAPES
- Publication
Landscape Ecology, 2023, Vol 38, Issue 12, p3249
- ISSN
0921-2973
- Publication type
Article
- DOI
10.1007/s10980-023-01777-w