Journal Title
Title of Journal: Marine Biology
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Abbravation: Marine Biology
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Publisher
Springer-Verlag
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Authors: J I Carreto N G Montoya H R Benavides R Guerrero M O Carignan
Publish Date: 2003/07/16
Volume: 143, Issue: 5, Pages: 1013-1027
Abstract
The surface abundance and species composition of phytoplankton communities were studied in a section across the continental shelf between the Río de La Plata and the oceanic waters of the Subtropical Convergence during late spring November 1999 Algal communities were examined using light microscopy and HPLCderived highperformance liquid chromatography pigment concentrations The CHEMTAX program was used to estimate the chlorophyll a chl a biomass of different algal classes The inclusion of the most abundant members of the chl c pigment family chl c 1 chl c 2 chl c 3 and chl c 2 monogalactosyldiacylglyceride esters in the pigment matrix improved the CHEMTAX interpretation of field data Using this novel approach four haptophyte populations were distinguished across the studied section even though they had qualitatively similar pigment signatures although one subtype lacked 19′hexanoyloxyfucoxanthin HexFuco Five different phytoplankton assemblages spatially segregated by the prevailing environmental conditions were distinguished during the studied period All of them showed a complex community structure formed by a background of smallsized cells such as cyanobacteria cryptophytes haptophytes and prasinophyceans on which diatom cryptophyte or some haptophyte blooms were overlapped In the estuarine assemblage where maximum chl a concentrations where found diatoms were always the dominant group 30–60 of total chl a but cryptophytes 10–40 prasinophyceans 2–20 and dinoflagellates 2–12 were also relevant In the coastal assemblage diatoms were also the dominant group 35–45 but haptophytes lacking HexFuco were subdominant 20–35 The continental shelf assemblage showed an almost exclusive dominance 90 of haptophytes resembling the coccolithophorid E huxleyi Another haptophyte Phaeocystis sp was dominant 75–85 in the Malvinas Current assemblage The Brazil Current assemblage was characterized by the codominance of cyanobacteria 45 and haptophytes 35 These results are discussed in relationship to the complex hydrographic features of the area
Keywords:
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- Functional morphology in chitons (Mollusca, Polyplacophora): influences of environment and ocean acidification
- Microbial interactions with the cyanobacterium Microcystis aeruginosa and their dependence on temperature
- Genetic connectivity of the ecosystem engineer Perumytilus purpuratus north to the 32°S southeast Pacific ecological discontinuity
- Phytoplankton ecology and production in the Red Sea off Jiddah, Saudi Arabia
- Adaptation for accuracy or for precision? Diel emergence timing of the intertidal insect Pontomyia oceana (Chironomidae)
- Mothers matter: contribution to local replenishment is linked to female size, mate replacement and fecundity in a fish metapopulation
- Living in the front: Neomysis americana (Mysidacea) in the Río de la Plata estuary, Argentina-Uruguay
- Reproductive biology and larval development of the temperate soft coral Dendronephthya gigantea (Alcyonacea: Nephtheidae)
- The response of temperate aquatic ecosystems to global warming: novel insights from a multidisciplinary project
- Recycle of buried macroalgal detritus in sediments: use of dual-labelling experiments in the field
- Genetic structure and gene flow of eelgrass Zostera marina populations in Tokyo Bay, Japan: implications for their restoration
- Genetic population structure in a commercial marine invertebrate with long-lived lecithotrophic larvae: Cucumaria frondosa (Echinodermata: Holothuroidea)
- Nuclear and mitochondrial DNA markers indicate unidirectional gene flow of Indo-Pacific to Atlantic bigeye tuna ( Thunnus obesus ) populations, and their admixture off southern Africa
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- Determination of δ 13 C and δ 15 N and trophic fractionation in jellyfish: implications for food web ecology
- Limits to local adaptation: some impacts of temperature on Nucella emarginata differ among populations, while others do not
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- Historical population demography of red snapper ( Lutjanus campechanus ) from the northern Gulf of Mexico based on analysis of sequences of mitochondrial DNA
- Mesocosm and in situ observations of the burrowing shrimp Calocaris templemani (Decapoda: Thalassinidea) and its bioturbation activities in soft sediments of the Laurentian Trough
- Population dynamics and factors controlling somatic degrowth of the common jellyfish, Aurelia aurita , in a temperate semi-enclosed cove (Kertinge Nor, Denmark)
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- Global phylogeography of Cassiopea (Scyphozoa: Rhizostomeae): molecular evidence for cryptic species and multiple invasions of the Hawaiian Islands
- Trophic importance of subtidal metazoan meiofauna: evidence from in situ exclusion experiments on soft and rocky substrates
- Relationship between mangrove abundance and tropical prawn production: a re-evaluation
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