EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/20/2019 | 12:00 PM - 12:15 PM | SPECIES DISPERSAL MEDIATES OPPOSING INFLUENCES OF A BRANCHING NETWORK ON GENETIC VARIATION IN A METAPOPULATION | 253 AB
SPECIES DISPERSAL MEDIATES OPPOSING INFLUENCES OF A BRANCHING NETWORK ON GENETIC VARIATION IN A METAPOPULATION
In nature, ubiquitous fractal networks can have two but opposing influences, by increasing distal and confluent habitats, respectively, under raising branching complexity on metapopulations’ genetic structure. In this study, we evaluated the integrated influences of network complexity and species dispersal mode/ability on genetic divergence among populations at the catchment scale, using a theoretical framework with empirical genetic data from four sympatric stream macroinvertebrate species. Empirical patterns of spatial genetic structure were attributed to dispersal ability and the species’ habitat specialisation levels. Our theoretical evidence showed that both greater landscape connectivity (via shorter watercourse distance) and greater isolation of distal habitats (e.g. headwater streams) occur in the more-branched networks. These two spatial features have negative and positve influences on genetic divergence, respectively, with their relative importance varying in different species. Downstream- and upstream-biased asymmetric dispersals dictate increases and declines, respectively, in genetic divergence. In addition, distal populations (e.g. in headwaters) have higher genetic independence between themselves under higher levels of downstream-biased asymmetry. A strong association between species features and evolutionary processes (gene flow and genetic drift) mediates the pervasive influences of branching complexity on metapopulation genetic divergence.
- Dispersal
- Connectivity
- Biodiversity
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Presenters/Authors
Ming-Chih Chiu
(), Ehime University, Japan, mingchih.chiu@gmail.com;
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Bin Li
(), Ehime University, Japan, binglee527@gmail.com;
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Kei Nukazawa
(), University of Miyazaki, Japan, kei.nukazawa@gmail.com ;
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Thaddeus Carvajal
(), Ehime University, Japan, tads.carvajal@gmail.com ;
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Kozo Watanabe
(), Ehime University, Japan, watanabe_kozo@cee.ehime-u.ac.jp;
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