Radiolarian vertical distribution patterns across the Southern California current
Polycystine radiolarians were identified in 36 plankton samples collected at depths ranging from 0 to 2000 m at four stations extending west from about the U.S.-Mexico border (approx. 32°N,117°W to 124°W), in November-December 1977. In total, 136 radiolarian taxa were recorded, but 90% of all indivi...
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todo:paper_09670637_v42_n2_p191_Kling2023-10-03T15:54:59Z Radiolarian vertical distribution patterns across the Southern California current Kling, S.A. Boltovskoy, D. radiolarian vertical distribution Pacific, (Northeast), California Current Polycystine radiolarians were identified in 36 plankton samples collected at depths ranging from 0 to 2000 m at four stations extending west from about the U.S.-Mexico border (approx. 32°N,117°W to 124°W), in November-December 1977. In total, 136 radiolarian taxa were recorded, but 90% of all individuals were accounted for by only 40 of these. Highest abundances were found either at the surface, or at 25-50 m. Based on maxima in the vertical profiles of the most abundant radiolarians, three major depth-intervals were defined in the upper 300 m: 0-50 m,100 m and 200-300 m. Between-station-similarities in the specific makeups of these layers, however, were low. Thirty-nine taxa had peak abundances below 300 m at one or more stations; 11 of these are probably deep-water forms. Although in terms of individuals per liter of water filtered, upper-layer taxa are noticeably more abundant than deep species, the latter have much more extended depth-ranges, which might significantly enhance their sedimentary output. The inshore and oceanic stations shared very similar, warmer-water radiolarian assemblages in the uppermost 25 m, whereas the intermediate station was dominated by colder-water forms at those depths. Below 50 m, however, the inshore station had enhanced proportions of deeper- and colder-water species, differing strongly from the oceanic site. We suggest that this pattern results from circulation of the Southern California Eddy, which transports Central Water from the oceanic station on the western edge of the California Current around the intermediate stations to the inshore stations. The coldwater signal at subsurface layers of the inshore station could be reinforced by coastal upwelling and southward transport by the California Current, thus further enhancing the abundances of deeperwater radiolarians at this site. Analyses of the effect of such vertical patterns on paleoceanographic interpretations stress the importance of the signal of "environmentally neutral" deep-living species, as well as that of shells produced in the near-surface layers of distant areas and transported at depth to the region of the study. © 1995. Fil:Boltovskoy, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09670637_v42_n2_p191_Kling |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
radiolarian vertical distribution Pacific, (Northeast), California Current |
| spellingShingle |
radiolarian vertical distribution Pacific, (Northeast), California Current Kling, S.A. Boltovskoy, D. Radiolarian vertical distribution patterns across the Southern California current |
| topic_facet |
radiolarian vertical distribution Pacific, (Northeast), California Current |
| description |
Polycystine radiolarians were identified in 36 plankton samples collected at depths ranging from 0 to 2000 m at four stations extending west from about the U.S.-Mexico border (approx. 32°N,117°W to 124°W), in November-December 1977. In total, 136 radiolarian taxa were recorded, but 90% of all individuals were accounted for by only 40 of these. Highest abundances were found either at the surface, or at 25-50 m. Based on maxima in the vertical profiles of the most abundant radiolarians, three major depth-intervals were defined in the upper 300 m: 0-50 m,100 m and 200-300 m. Between-station-similarities in the specific makeups of these layers, however, were low. Thirty-nine taxa had peak abundances below 300 m at one or more stations; 11 of these are probably deep-water forms. Although in terms of individuals per liter of water filtered, upper-layer taxa are noticeably more abundant than deep species, the latter have much more extended depth-ranges, which might significantly enhance their sedimentary output. The inshore and oceanic stations shared very similar, warmer-water radiolarian assemblages in the uppermost 25 m, whereas the intermediate station was dominated by colder-water forms at those depths. Below 50 m, however, the inshore station had enhanced proportions of deeper- and colder-water species, differing strongly from the oceanic site. We suggest that this pattern results from circulation of the Southern California Eddy, which transports Central Water from the oceanic station on the western edge of the California Current around the intermediate stations to the inshore stations. The coldwater signal at subsurface layers of the inshore station could be reinforced by coastal upwelling and southward transport by the California Current, thus further enhancing the abundances of deeperwater radiolarians at this site. Analyses of the effect of such vertical patterns on paleoceanographic interpretations stress the importance of the signal of "environmentally neutral" deep-living species, as well as that of shells produced in the near-surface layers of distant areas and transported at depth to the region of the study. © 1995. |
| format |
JOUR |
| author |
Kling, S.A. Boltovskoy, D. |
| author_facet |
Kling, S.A. Boltovskoy, D. |
| author_sort |
Kling, S.A. |
| title |
Radiolarian vertical distribution patterns across the Southern California current |
| title_short |
Radiolarian vertical distribution patterns across the Southern California current |
| title_full |
Radiolarian vertical distribution patterns across the Southern California current |
| title_fullStr |
Radiolarian vertical distribution patterns across the Southern California current |
| title_full_unstemmed |
Radiolarian vertical distribution patterns across the Southern California current |
| title_sort |
radiolarian vertical distribution patterns across the southern california current |
| url |
http://hdl.handle.net/20.500.12110/paper_09670637_v42_n2_p191_Kling |
| work_keys_str_mv |
AT klingsa radiolarianverticaldistributionpatternsacrossthesoutherncaliforniacurrent AT boltovskoyd radiolarianverticaldistributionpatternsacrossthesoutherncaliforniacurrent |
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1782030711985799168 |