Metapopulation structure of a semi-anadromous fish in a dynamic environment. Feyrer, F., Hobbs, J., Acuña, S., Mahardja, B., Grimaldo, L., Baerwald, M., Johnson, R., C., & Teh, S. Canadian Journal of Fisheries and Aquatic Sciences, 72(5):709-721, National Research Council of Canada, 5, 2015. ![Metapopulation structure of a semi-anadromous fish in a dynamic environment [link]](https://bibbase.org/img/filetypes/link.svg "link")
Website doi abstract bibtex The Sacramento splittail (Pogonichthys macrolepidotus) is a relatively large (400 mm), long-lived (8 years) demersal cyprinid of conservation importance endemic to the San Francisco Estuary (SFE), California, USA. It exhibits a semi-anadromous life cycle spending adult life in low to moderate salinity (0-12) habitat with migrations into upstream freshwater rivers and floodplains for spawning during winter-spring. The species persists as two genetically distinguishable populations - one dominant and one subordinate - separated by discrete spawning habitats that we suggest resemble an island-mainland metapopulation structure. The populations overlap in distribution in the SFE, yet segregation is maintained with individuals tending to aggregate or school with others of similar population heritage and natal origin. The populations are spatially connected via dispersal of the dominant population into the subordinate population's spawning habitat when climate patterns produce freshwater outflow sufficient to form a bridge of suitable low salinity habitat across the upper SFE. Habitat affinities of the two populations, hydrodynamic modeling studies, and historical outflow records together suggest such conditions occur in approximately 1/3 of years overall with an irregular frequency. This dynamic pattern of spatial connectivity controlled by climate variability may be an important driver of gene flow between the two populations.
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title = {Metapopulation structure of a semi-anadromous fish in a dynamic environment},
type = {article},
year = {2015},
pages = {709-721},
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abstract = {The Sacramento splittail (Pogonichthys macrolepidotus) is a relatively large (400 mm), long-lived (8 years) demersal cyprinid of conservation importance endemic to the San Francisco Estuary (SFE), California, USA. It exhibits a semi-anadromous life cycle spending adult life in low to moderate salinity (0-12) habitat with migrations into upstream freshwater rivers and floodplains for spawning during winter-spring. The species persists as two genetically distinguishable populations - one dominant and one subordinate - separated by discrete spawning habitats that we suggest resemble an island-mainland metapopulation structure. The populations overlap in distribution in the SFE, yet segregation is maintained with individuals tending to aggregate or school with others of similar population heritage and natal origin. The populations are spatially connected via dispersal of the dominant population into the subordinate population's spawning habitat when climate patterns produce freshwater outflow sufficient to form a bridge of suitable low salinity habitat across the upper SFE. Habitat affinities of the two populations, hydrodynamic modeling studies, and historical outflow records together suggest such conditions occur in approximately 1/3 of years overall with an irregular frequency. This dynamic pattern of spatial connectivity controlled by climate variability may be an important driver of gene flow between the two populations.},
bibtype = {article},
author = {Feyrer, Frederick and Hobbs, James and Acuña, Shawn and Mahardja, Brian and Grimaldo, Lenny and Baerwald, Melinda and Johnson, Rachel C. and Teh, Swee},
doi = {10.1139/cjfas-2014-0433},
journal = {Canadian Journal of Fisheries and Aquatic Sciences},
number = {5}
}
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