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Marine Ecology Progress Series

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MEPS 586:181-192 (2018)  -  DOI:

Norwegian fjords contain sub-populations of roundnose grenadier Coryphaenoides rupestris, a deep-water fish

Aurélien Delaval1, Geir Dahle2, Halvor Knutsen3,4, Jennifer Devine2, Anne Gro Vea Salvanes1,*

1Department of Biology, University of Bergen, 5020 Bergen, Norway
2Institute of Marine Research, 5817 Bergen, Norway
3Institute of Marine Research, Flødevigen, 4817 His, Norway
4Centre for Coastal Research, University of Agder, 4604 Kristiansand, Norway
*Corresponding author:

ABSTRACT: The roundnose grenadier Coryphaenoides rupestris is a benthopelagic fish distributed along the continental, island, and seamount slopes in the North Atlantic and along the Mid-Atlantic Ridge. Previous studies have indicated that C. rupestris consists of sub-populations across its distribution range, but no study has addressed small-scale population structuring at the scale of fjords. Here we study the population genetic structure of C. rupestris from fjords and coastal sites in south-western Norway using 8 microsatellite DNA markers. Genetic patterns were contrasted with environmental variables (geographic distance, bottom depth, sill depth, bottom salinity, bottom oxygen, and bottom temperature) and fish condition indices (length-weight, gonadosomatic index, and hepatosomatic index). We observed significant genetic heterogeneity across the study area (FST = 0.0297, p < 0.001), suggesting several populations occur at the scale of fjords or finer. The Skagerrak samples (2001, 2008, and 2016) did not differentiate and suggest that this area constitutes a temporally stable population unit. Population structuring in C. rupestris along the Norwegian coast seems to be influenced by geographic distance and Norway’s complex bathymetry, such as fjord sills, appear to limit its dispersal and migration. We found a strong positive correlation between genetic distance and geographic distance (Mantel test, r = 0.702, p = 0.001), bottom depth (r = 0.555, p = 0.014), and a trend with bottom temperature (r = 0.639, p = 0.070). C. rupestris is an overfished species that has been Red-Listed as Critically Endangered. Our findings have important management implications for the species.

KEY WORDS: Fjords · Roundnose grenadier · Connectivity · Population genetics

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Cite this article as: Delaval A, Dahle G, Knutsen H, Devine J, Salvanes AGV (2018) Norwegian fjords contain sub-populations of roundnose grenadier Coryphaenoides rupestris, a deep-water fish. Mar Ecol Prog Ser 586:181-192.

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