Species delimitation in endangered groundwater salamanders: Implications for aquifer management and biodiversity conservation

Citation

Material Information

Title:
Species delimitation in endangered groundwater salamanders: Implications for aquifer management and biodiversity conservation
Series Title:
PNAS
Creator:
Devitt, Thomas J.
Wright, April M.
Cannatella, David C.
Hillis, David M.
Publisher:
National Academy of Sciences
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Endangered Species ( local )
Groundwater Depletion ( local )
Multispecies Coalescent ( local )
Phylogeography ( local )
Species Tree ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
Groundwater-dependent species are among the least-known components of global biodiversity, as well as some of the most vulnerable because of rapid groundwater depletion at regional and global scales. The karstic Edwards–Trinity aquifer system of west-central Texas is one of the most species-rich groundwater systems in the world, represented by dozens of endemic groundwater-obligate species with narrow, naturally fragmented distributions. Here, we examine how geomorphological and hydrogeological processes have driven population divergence and speciation in a radiation of salamanders (Eurycea) endemic to the Edwards–Trinity system using phylogenetic and population genetic analysis of genome-wide DNA sequence data. Results revealed complex patterns of isolation and reconnection driven by surface and subsurface hydrology, resulting in both adaptive and nonadaptive population divergence and speciation. Our results uncover cryptic species diversity and refine the borders of several threatened and endangered species. The US Endangered Species Act has been used to bring state regulation to unrestricted groundwater withdrawals in the Edwards (Balcones Fault Zone) Aquifer, where listed species are found. However, the Trinity and Edwards–Trinity (Plateau) aquifers harbor additional species with similarly small ranges that currently receive no protection from regulatory programs designed to prevent groundwater depletion. Based on regional climate models that predict increased air temperature, together with hydrologic models that project decreased springflow, we conclude that Edwards–Trinity salamanders and other codistributed groundwater-dependent organisms are highly vulnerable to extinction within the next century.
Original Version:
PNAS, Vol. 116, no. 7 (2019-02-12).

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University of South Florida Library
Holding Location:
University of South Florida
Rights Management:
This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.

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