UC Santa Barbara
How does coarse gravel augmentation affect early-stage Chinook salmon Oncorhynchus tshawytscha embryonic survivorship?
- Author(s): Utz, RM
- Mesick, CF
- Cardinale, BJ
- Dunne, T
- et al.
Published Web Locationhttps://doi.org/10.1111/jfb.12085
Early-stage Chinook salmon Oncorhynchus tshawytscha embryos were incubated in artificial redds that mimicked hyporheic conditions in gravel-augmented habitat to assess survivorship. Two complementary experiments were conducted where units varied along gradients of (1) increasing interstitial flow velocity (0·05-2·50cms-1) in a uniformly coarse (particles ≥22mm) sediment mixture and (2) increasing sediment porosity with interstitial flow velocity held constant. Embryonic survivorship increased moderately along a gradient of interstitial flow velocity, while survivorship among units with varying sediment porosities was consistent. No evidence for flow-induced agitation and mortality was observed. Results suggest that high interstitial flow velocities may confer a moderate advantage for incubating salmonid embryos when conditions that typically reduce embryonic mortality (i.e. low concentrations of fine particles) are ideal. © 2013 The Authors. Journal of Fish Biology © 2013 The Fisheries Society of the British Isles.
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