Nearshore Larval Retention and Cross-Shelf Migration of Benthic Crustaceans at an Upwelling Center

Nearshore Larval Retention and Cross-Shelf Migration of Benthic Crustaceans at an Upwelling Center

Planktonic larvae are considered to be highly susceptible to offshore transport in productive upwelling regions, thereby increasing dispersal and limiting recruitment. However, larvae of 42 species of nearshore benthic crustaceans primarily developed on the inner shelf at locations both in (98.5%) a...

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Bibliographic Details
Published in:Frontiers in Marine Science Vol. 5
Main Authors: Morgan, Steven G., Miller, Seth H., Robart, Matt J., Largier, John L.
Format: Journal Article
Language:English
Published: Lausanne Frontiers Research Foundation 15-05-2018
Frontiers Media S.A
Subjects:
Aquatic crustaceans
behavior
Benthos
Coasts
Connectivity
Cruises
Crustaceans
Dispersal
Internal waves
Invertebrates
Larvae
larval transport
Migrations
Migratory species
Mortality
Ocean circulation
Offshore
Population
population connectivity
Recruitment
Recruitment (fisheries)
recruitment limitation
Retention
Species
Surface water
Transport
Upwelling
Wind
United States > US
North America
California
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Description
Summary:Planktonic larvae are considered to be highly susceptible to offshore transport in productive upwelling regions, thereby increasing dispersal and limiting recruitment. However, larvae of 42 species of nearshore benthic crustaceans primarily developed on the inner shelf at locations both in (98.5%) and away (99.8%) from a perennial upwelling center during the peak upwelling season in a recruitment-limited region characterized by strong, persistent upwelling. During three cross-shelf cruises conducted at each location, larvae of 21 species remained on the inner shelf at both sites by occurring below a shallow Ekman layer of seaward-flowing surface waters throughout development while larvae of the other species migrated to mid-shelf (four species) or offshore (14 species) by occurring closer to the surface early in development. Postlarvae apparently returned to adult habitats inshore either by descending to landward-flowing upwelled waters or ascending to the surface where behavior allows them to be transported shoreward by internal waves, diel wind cycles or wind relaxation events. Thus, the cause of recruitment limitation along upwelling coasts does not appear to be due to losses from offshore transport, requiring new research directions to advance our understanding of population dynamics, structure and connectivity.
ISSN:2296-7745
2296-7745
DOI:10.3389/fmars.2018.00161