期刊
MOLECULAR ECOLOGY
卷 31, 期 9, 页码 2562-2577出版社
WILEY
DOI: 10.1111/mec.16415
关键词
coastal; comparative study; gene flow; genomics; habitat patchiness; isolation by distance; larval drift; marine fish
资金
- Norwegian Research Council (NRC) through the project ECOGENOME [280453]
- MarGen II, an Intereg project under the Oresund-Kattegat-Skagerrak programme
- Ministry of Trade, Industry and Fisheries
Gene flow has a significant impact on spatial genetic structure and local adaptation. The presence or absence of a pelagic larval stage and the spatial distribution of suitable habitats play important roles in shaping gene flow and the genetic structure of populations. This study used whole genome sequencing and reduced representation sequencing data to analyze the genetic structure of the broadnosed pipefish. The findings revealed changes in population connectivity and were compared to two other fish species with a pelagic larval stage.
Gene flow shapes spatial genetic structure and the potential for local adaptation. Among marine animals with nonmigratory adults, the presence or absence of a pelagic larval stage is thought to be a key determinant in shaping gene flow and the genetic structure of populations. In addition, the spatial distribution of suitable habitats is expected to influence the distribution of biological populations and their connectivity patterns. We used whole genome sequencing to study demographic history and reduced representation (double-digest restriction associated DNA) sequencing data to analyse spatial genetic structure in broadnosed pipefish (Syngnathus typhle). Its main habitat is eelgrass beds, which are patchily distributed along the study area in southern Norway. Demographic connectivity among populations was inferred from long-term (similar to 30-year) population counts that uncovered a rapid decline in spatial correlations in abundance with distance as short as similar to 2 km. These findings were contrasted with data for two other fish species that have a pelagic larval stage (corkwing wrasse, Symphodus melops; black goby, Gobius niger). For these latter species, we found wider spatial scales of connectivity and weaker genetic isolation-by-distance patterns, except where both species experienced a strong barrier to gene flow, seemingly due to lack of suitable habitat. Our findings verify expectations that a fragmented habitat and absence of a pelagic larval stage promote genetic structure, while presence of a pelagic larvae stage increases demographic connectivity and gene flow, except perhaps over extensive habitat gaps.
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