Connectivity, diversity, and hybridization between two endemic fish species (Percilia spp.) in a complex temperate landscape

Valenzuela‐Aguayo, Francisca; McCracken, Gregory R.; Díaz, Gustavo; Manosalva, Aliro; Habit, Evelyn; Ruzzante, Daniel E.

doi:10.1007/s10592-021-01400-y

Cited by 4 publications

(1 citation statement)

References 60 publications

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“…Data available from the Dryad Digital Repository: https://doi.org/10.5061/dryad.s1rn8pk3r (Valenzuela‐Aguayo, McCracken, Manosalva, Habit, & Ruzzante, ).…”

Section: Data Availability Statementmentioning

confidence: 99%

Human‐induced habitat fragmentation effects on connectivity, diversity, and population persistence of an endemic fish, Percilia irwini, in the Biobío River basin (Chile)

Valenzuela‐Aguayo

McCracken

Manosalva

et al. 2019

Evolutionary Applications

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An understanding of how genetic variability is distributed in space is fundamental for the conservation and maintenance of diversity in spatially fragmented and vulnerable populations. While fragmentation can occur from natural barriers, it can also be exacerbated by anthropogenic activities such as hydroelectric power plant development. Whatever the source, fragmentation can have significant ecological effects, including disruptions of migratory processes and gene flow among populations. In Chile, the Biobío River basin exhibits a high degree of habitat fragmentation due to the numerous hydroelectric power plants in operation, the number of which is expected to increase following new renewable energy use strategies. Here, we assessed the effects of different kinds of barriers on the genetic structure of the endemic freshwater fish Percilia irwini, knowledge that is critically needed to inform conservation strategies in light of current and anticipated further fragmentation initiatives in the system. We identified eight genetic units throughout the entire Biobío system with high effective sizes. A reduced effective size estimate was, however, observed in a single population located between two impassable barriers. Both natural waterfalls and human‐made dams were important drivers of population differentiation in this system; however, dams affect genetic diversity differentially depending on their mode of operation. Evidence of population extirpation was found in two river stretches limited by upstream and downstream dams. Significant gene flow in both directions was found among populations not separated by natural or anthropogenic barriers. Our results suggest a significant vulnerability of P. irwini populations to future dam development and demonstrate the importance of studying basin‐wide data sets with genetic metrics to understand the strength and direction of anthropogenic impacts on fish populations.

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“…Data available from the Dryad Digital Repository: https://doi.org/10.5061/dryad.s1rn8pk3r (Valenzuela‐Aguayo, McCracken, Manosalva, Habit, & Ruzzante, ).…”

Section: Data Availability Statementmentioning

confidence: 99%

Human‐induced habitat fragmentation effects on connectivity, diversity, and population persistence of an endemic fish, Percilia irwini, in the Biobío River basin (Chile)

Valenzuela‐Aguayo

McCracken

Manosalva

et al. 2019

Evolutionary Applications

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Drainage reversal with no lineage expansion, a case of competitive exclusion? The genetics ofGalaxias maculatusin two connected trans-Andean systems

Tymoshuk,

Delgado,

Mccracken

et al. 2022

Biological Journal of the Linnean Society

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Understanding how historical and contemporary processes lead to genetic differentiation among populations is a fundamental goal of evolutionary and conservation biology. This study focuses on Galaxias maculatus, a widely distributed fish exhibiting diadromous and freshwater resident forms. We examine the genetic differentiation among resident populations from the Manso River System, a trans-Andean system which thus went through drainage reversal following the Last Glacial Maximum (LGM), and resident and diadromous populations from the connected Puelo River that drains into the Pacific Ocean. Single nucleotide polymorphic (SNP) markers revealed that resident populations from the Manso River System are genetically distinguishable from the diadromous and resident populations from the Puelo River. This suggests that G. maculatus from the Manso River System likely colonized the area from a glacial refugium east of the Andes and did not expand downstream during drainage reversal, whereas the populations from the Puelo River colonized the area from glacial refugia west of the Andes. The populations from the Manso River exhibited lower genetic diversity than the Puelo River populations. Galaxias maculatus resident populations in Patagonia are decreasing due to anthropogenic factors. The Manso River System resident populations are susceptible to these factors and may show further decreases in genetic diversity.

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Environmental DNA (eDNA) applications in freshwater fisheries management and conservation in Canada: overview of current challenges and opportunities

Bernos

Yates

Docker

et al. 2023

Can. J. Fish. Aquat. Sci.

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Environmental DNA (eDNA) monitoring methods have played a significant role in improving fisheries management decisions. Yet, their impact to date has been rather limited in Canada, where eDNA analyses are only beginning to be used to inform management and conservation decisions, practices, and policies. Studies investigating hurdles to the incorporation of eDNA data into fisheries management decisions generally focus on technical challenges (i.e. risks of false positive and false negative detections). We set out to identify challenges that eDNA researchers and conservation practitioners must overcome to fully unlock the benefits of eDNA for fish management in the Canadian context. We discuss aspects of the broad and heterogeneous geography, preponderance of regions located far from densely populated areas, complex political landscape, and cultural diversity of Canada that may complicate the design of reliable eDNA monitoring tools or restrict their use if not adequately addressed. To advocate for the wider use of eDNA, we outline a number of action items that would facilitate the broad adoption of eDNA as a monitoring tool at the Canadian scale.

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Connectivity, diversity, and hybridization between two endemic fish species (Percilia spp.) in a complex temperate landscape

Cited by 4 publications

References 60 publications

Human‐induced habitat fragmentation effects on connectivity, diversity, and population persistence of an endemic fish, Percilia irwini, in the Biobío River basin (Chile)

Human‐induced habitat fragmentation effects on connectivity, diversity, and population persistence of an endemic fish, Percilia irwini, in the Biobío River basin (Chile)

Drainage reversal with no lineage expansion, a case of competitive exclusion? The genetics ofGalaxias maculatusin two connected trans-Andean systems

Environmental DNA (eDNA) applications in freshwater fisheries management and conservation in Canada: overview of current challenges and opportunities

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