Phylogeography of the catfish Hatcheria macraei reveals a negligible role of drainage divides in structuring populations

Peter Unmack, Juan Barriga, Miguel Battini, Evelyn Habit, Jerald Johnson

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Southern South America provides a set of unusual geographic features that make it particularly interesting for studying phylogeography. The Andes Mountains run along a north-to-south axis and act as a barrier to gene flow for much of the biota of this region, with southern portions experiencing extensive historical glaciation. Geological data reveal a series of drainage reversals, shifting from Pacific Ocean outlets to Atlantic Ocean outlets because of glacier formation that dammed and reversed rivers. Once glaciers melted around 13 000 years ago, drainages returned to the Pacific Ocean. This geologic history predicts that aquatic organisms in Pacific rivers should have their closest relationships to their counterparts in Atlantic rivers immediately to their east. We tested this prediction in the trichomycterid catfish Hatcheria macraei from 38 locations using the mitochondrial cytochrome b gene. Our results show that most populations found in Pacific rivers were closely related to fish found in the adjacent Atlantic draining Ri´o Chubut. Surprisingly, one documented drainage reversal (from Ri´o Deseado into Ri´o Baker) did not result in movement of H. macraei. Overall, we found the lowest levels of genetic structure between most Pacific rivers that are adjacent to the Atlantic draining Ri´o Chubut. We also found low levels of population structuring among three of four contemporary river basins that drain to the Atlantic Ocean. Our findings suggest that drainage basin boundaries have historically not played an important long-term role in structuring between nine of 11 drainages, an unusual finding in freshwater biogeography.
Original languageEnglish
Pages (from-to)942-959
Number of pages18
JournalMolecular Ecology
Volume21
DOIs
Publication statusPublished - 2012
Externally publishedYes

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Hatcheria macraei
Phylogeography
Catfishes
phylogeography
Rivers
catfish
Drainage
drainage
rivers
river
Atlantic Ocean
Pacific Ocean
Population
Ice Cover
ocean
glaciers
glacier
Andes region
aquatic organisms
glaciation

Cite this

Unmack, Peter ; Barriga, Juan ; Battini, Miguel ; Habit, Evelyn ; Johnson, Jerald. / Phylogeography of the catfish Hatcheria macraei reveals a negligible role of drainage divides in structuring populations. In: Molecular Ecology. 2012 ; Vol. 21. pp. 942-959.
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Phylogeography of the catfish Hatcheria macraei reveals a negligible role of drainage divides in structuring populations. / Unmack, Peter; Barriga, Juan; Battini, Miguel; Habit, Evelyn; Johnson, Jerald.

In: Molecular Ecology, Vol. 21, 2012, p. 942-959.

Research output: Contribution to journalArticle

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AU - Unmack, Peter

AU - Barriga, Juan

AU - Battini, Miguel

AU - Habit, Evelyn

AU - Johnson, Jerald

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AB - Southern South America provides a set of unusual geographic features that make it particularly interesting for studying phylogeography. The Andes Mountains run along a north-to-south axis and act as a barrier to gene flow for much of the biota of this region, with southern portions experiencing extensive historical glaciation. Geological data reveal a series of drainage reversals, shifting from Pacific Ocean outlets to Atlantic Ocean outlets because of glacier formation that dammed and reversed rivers. Once glaciers melted around 13 000 years ago, drainages returned to the Pacific Ocean. This geologic history predicts that aquatic organisms in Pacific rivers should have their closest relationships to their counterparts in Atlantic rivers immediately to their east. We tested this prediction in the trichomycterid catfish Hatcheria macraei from 38 locations using the mitochondrial cytochrome b gene. Our results show that most populations found in Pacific rivers were closely related to fish found in the adjacent Atlantic draining Ri´o Chubut. Surprisingly, one documented drainage reversal (from Ri´o Deseado into Ri´o Baker) did not result in movement of H. macraei. Overall, we found the lowest levels of genetic structure between most Pacific rivers that are adjacent to the Atlantic draining Ri´o Chubut. We also found low levels of population structuring among three of four contemporary river basins that drain to the Atlantic Ocean. Our findings suggest that drainage basin boundaries have historically not played an important long-term role in structuring between nine of 11 drainages, an unusual finding in freshwater biogeography.

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