期刊
MARINE ECOLOGY PROGRESS SERIES
卷 595, 期 -, 页码 105-122出版社
INTER-RESEARCH
DOI: 10.3354/meps12561
关键词
Barnacle larvae; Chthamalus fissus; Early-stage nauplii; Cyprids; Hydrographic and hydrodynamic conditions
资金
- National Science Foundation [OCE-1357290, OCE-1357327, OCE-1630459, OCE-1630474]
- University of San Diego
- Woods Hole Oceanographic Institution
- Directorate For Geosciences [1357290] Funding Source: National Science Foundation
- Division Of Ocean Sciences [1357327] Funding Source: National Science Foundation
Vertical and cross-shore distributions and abundances of shallow-water barnacle larvae were characterized in La Jolla, southern California (USA), during a 2 yr period. Five stations located within 1 km of shore and ranging from 4-12 m water depths were sampled intensively in 2 m depth intervals during 27 cruises throughout spring-summer (April-July) and fall-winter (October-December) of 2014 and 2015. Larval abundances significantly decreased from 2014 to 2015, which could be related to the arrival of a warm-water anomaly (the so-called 'Blob') in 2014 and El Nino conditions in 2015. Despite the presence of these large-scale regional disturbances, vertical and cross-shore larval distributions were consistent throughout the 2 yr study period. Early-stage nauplii and Chthamalus fissus cyprids tracked bottom depth, and cyprids were on average deeper than nauplii. Vertical distributions were not related to the mid-depth of the thermocline or thermal stratification. Early-stage nauplii had a broader cross-shore distribution than cyprids, which were concentrated at inshore stations. Nearshore cyprid concentration had a positive relationship with thermal stratification, and the center of distribution of cyprids was farther offshore during fall-winter when stratification decreased. These results suggest that thermal stratification elicits enhanced behavioral control of cyprids to remain close to shore and reach the adult habitat.
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