High Larval Concentrations and Onshore Transport of Barnacle Cyprids Associated With Thermal Stratification
To better understand the hydrodynamic and hydrographic conditions experienced by larvae in the nearshore (within 1 km of shore), and the role that larval behavior plays in mediating shoreward transport to adult benthic habitats, we examined the vertical distribution and concentration of barnacle cyp...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2021-11-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2021.748389/full |
| _version_ | 1819045840265674752 |
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| author | Gabriela M. Yamhure Nathalie Reyns Jesús Pineda |
| author_facet | Gabriela M. Yamhure Nathalie Reyns Jesús Pineda |
| author_sort | Gabriela M. Yamhure |
| collection | DOAJ |
| description | To better understand the hydrodynamic and hydrographic conditions experienced by larvae in the nearshore (within 1 km of shore), and the role that larval behavior plays in mediating shoreward transport to adult benthic habitats, we examined the vertical distribution and concentration of barnacle cyprids in a shallow, nearshore region in southern California, United States. We collected high-resolution physical measurements of currents and temperature at 3 stations (8, 5, and 4 m depths), and high-frequency measurements of barnacle larvae at a 4 m deep station ∼300 m from shore. Larvae were sampled from distinct 1 m depth intervals between the surface and the bottom (0–1 m, 1–2 m, 2–3 m, 3 m-bottom), each hour for overnight periods that ranged between 13 to 24 h in five cruises during the summers of 2017 and 2018. Barnacle cyprids of Chthamalus fissus predominated in all samples. Thermal stratification decreased closer to shore, but when the nearshore-most station remained stratified (Δ°C m–1 ≥ 0.1), C. fissus cyprid concentrations were high to extremely abundant (exceeding 200 and 4,000 individuals m–3, respectively). There were significant positive correlations between thermal stratification and the log-transformed C. fissus concentration at cruise-to-cruise scales, and between stratification and vertical variability in the high-frequency cross-shore currents at 2-day scales. Additionally, estimated larval transport was relatively high and shoreward when nearshore thermal stratification was greatest. Significant, albeit small, diel differences in cyprid distributions were also observed, with the proportion of cyprids increasing near the surface at night, and concentrations greater during the day than at night. Collectively, these results suggest that thermal stratification increases larval supply to the nearshore, and may enhance onshore larval transport to augment chances of successful settlement and recruitment to the intertidal adult habitat. |
| first_indexed | 2024-12-21T10:34:58Z |
| format | Article |
| id | doaj.art-7cfde930be484d139517f090c7301394 |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-12-21T10:34:58Z |
| publishDate | 2021-11-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-7cfde930be484d139517f090c73013942022-12-21T19:07:05ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452021-11-01810.3389/fmars.2021.748389748389High Larval Concentrations and Onshore Transport of Barnacle Cyprids Associated With Thermal StratificationGabriela M. Yamhure0Nathalie Reyns1Jesús Pineda2Environmental and Ocean Sciences Department, University of San Diego, San Diego, CA, United StatesEnvironmental and Ocean Sciences Department, University of San Diego, San Diego, CA, United StatesBiology Department, Woods Hole Oceanographic Institution, Woods Hole, MA, United StatesTo better understand the hydrodynamic and hydrographic conditions experienced by larvae in the nearshore (within 1 km of shore), and the role that larval behavior plays in mediating shoreward transport to adult benthic habitats, we examined the vertical distribution and concentration of barnacle cyprids in a shallow, nearshore region in southern California, United States. We collected high-resolution physical measurements of currents and temperature at 3 stations (8, 5, and 4 m depths), and high-frequency measurements of barnacle larvae at a 4 m deep station ∼300 m from shore. Larvae were sampled from distinct 1 m depth intervals between the surface and the bottom (0–1 m, 1–2 m, 2–3 m, 3 m-bottom), each hour for overnight periods that ranged between 13 to 24 h in five cruises during the summers of 2017 and 2018. Barnacle cyprids of Chthamalus fissus predominated in all samples. Thermal stratification decreased closer to shore, but when the nearshore-most station remained stratified (Δ°C m–1 ≥ 0.1), C. fissus cyprid concentrations were high to extremely abundant (exceeding 200 and 4,000 individuals m–3, respectively). There were significant positive correlations between thermal stratification and the log-transformed C. fissus concentration at cruise-to-cruise scales, and between stratification and vertical variability in the high-frequency cross-shore currents at 2-day scales. Additionally, estimated larval transport was relatively high and shoreward when nearshore thermal stratification was greatest. Significant, albeit small, diel differences in cyprid distributions were also observed, with the proportion of cyprids increasing near the surface at night, and concentrations greater during the day than at night. Collectively, these results suggest that thermal stratification increases larval supply to the nearshore, and may enhance onshore larval transport to augment chances of successful settlement and recruitment to the intertidal adult habitat.https://www.frontiersin.org/articles/10.3389/fmars.2021.748389/fulllarval vertical distributionthermoclinelarval transportChthamalus fissusdiel cyclesnearshore |
| spellingShingle | Gabriela M. Yamhure Nathalie Reyns Jesús Pineda High Larval Concentrations and Onshore Transport of Barnacle Cyprids Associated With Thermal Stratification Frontiers in Marine Science larval vertical distribution thermocline larval transport Chthamalus fissus diel cycles nearshore |
| title | High Larval Concentrations and Onshore Transport of Barnacle Cyprids Associated With Thermal Stratification |
| title_full | High Larval Concentrations and Onshore Transport of Barnacle Cyprids Associated With Thermal Stratification |
| title_fullStr | High Larval Concentrations and Onshore Transport of Barnacle Cyprids Associated With Thermal Stratification |
| title_full_unstemmed | High Larval Concentrations and Onshore Transport of Barnacle Cyprids Associated With Thermal Stratification |
| title_short | High Larval Concentrations and Onshore Transport of Barnacle Cyprids Associated With Thermal Stratification |
| title_sort | high larval concentrations and onshore transport of barnacle cyprids associated with thermal stratification |
| topic | larval vertical distribution thermocline larval transport Chthamalus fissus diel cycles nearshore |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2021.748389/full |
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