Abstract
Successful resource-management and conservation outcomes ideally depend on matching the spatial scales of population demography, local adaptation, and threat mitigation. For marine fish with high dispersal capabilities, this remains a fundamental challenge. Based on daily parentage assignments of more than 4,000 offspring, we document fine-scaled temporal differences in individual reproductive success for two spatially adjacent (<10 km) populations of a broadcast-spawning marine fish. Distinguished by differences in genetics and life history, Atlantic cod (Gadus morhua) from inner- and outer-fjord populations were allowed to compete for mating and reproductive opportunities. After accounting for phenotypic variability in several traits, reproductive success of outer-fjord cod was significantly lower than that of inner-fjord cod. This finding, given that genomically different cod ecotypes inhabit inner- and outer-fjord waters, raises the intriguing hypothesis that the populations might be diverging because of ecological speciation. Individual reproductive success, skewed within both sexes (more so among males), was positively affected by body size, which also influenced the timing of reproduction, larger individuals spawning later among females but earlier among males. Our work suggests that spatial mismatches between management and biological units exist in marine fishes and that studies of reproductive interactions between putative populations or ecotypes can provide an informative basis on which determination of the scale of local adaptation can be ascertained.
| Original language | English |
|---|---|
| Pages (from-to) | 11634-11644 |
| Number of pages | 11 |
| Journal | Ecology and Evolution |
| Volume | 8 |
| Issue number | 23 |
| DOIs | |
| Publication status | Published - Dec 2018 |
Bibliographical note
Funding Information:Natural Sciences and Engineering Research Council of Canada, Grant/Award Number: Discovery Grant; Norges Forskningsråd, Grant/Award Number: Project Number 143961; Norwegian Research Council; European Regional Development Fund, Grant/Award Number: Interreg IVa. “MarGen” project
Funding Information:
The authors acknowledge the contributions of the staff, techni‐ cians, students (especially E. Juliussen and D. Rivas‐Sánchez), and volunteers at the Institute of Marine Research Flødevigen Research Station who assisted with experimental maintenance and data col‐ lection. The study was funded by Canada’s Natural Sciences and Engineering Research Council (Discovery Grant to JAH and Canada Graduate Scholarships to NER and RAO), the Norwegian Research Council (HAVKYST Grant to JAH and Leiv Eiriksson Mobility Grant to RAO), the Prediction and Observation of the Marine Environment network (mobility grants to NER and RAO), and the European Regional Development Fund (Interreg IVa. “MarGen” project). We are grateful for the constructive criticisms proffered by referees on an earlier version of the manuscript.
Funding Information:
The authors acknowledge the contributions of the staff, technicians, students (especially E. Juliussen and D. Rivas-S?nchez), and volunteers at the Institute of Marine Research Fl?devigen Research Station who assisted with experimental maintenance and data collection. The study was funded by Canada's Natural Sciences and Engineering Research Council (Discovery Grant to JAH and Canada Graduate Scholarships to NER and RAO), the Norwegian Research Council (HAVKYST Grant to JAH and Leiv Eiriksson Mobility Grant to RAO), the Prediction and Observation of the Marine Environment network (mobility grants to NER and RAO), and the European Regional Development Fund (Interreg IVa. ?MarGen? project). We are grateful for the constructive criticisms proffered by referees on an earlier version of the manuscript.
Publisher Copyright:
© 2018 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.
ASJC Scopus Subject Areas
- Ecology, Evolution, Behavior and Systematics
- Ecology
- Nature and Landscape Conservation
PubMed: MeSH publication types
- Journal Article
