IIMYC   23581
INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Unidad Ejecutora - UE
artículos
Título:
Phytoplankton types and primary production in the Argentine Sea
Autor/es:
SEGURA, V., LUTZ, V.A., DOGLIOTTI, A.I., SILVA, R.I., NEGRI, R.M., AKSELMAN, R., BENAVIDES, H.
Revista:
MARINE ECOLOGY PROGRESS SERIES
Editorial:
INTER-RESEARCH
Referencias:
Lugar: Oldendorf/Luhe; Año: 2013 vol. 491 p. 15 - 31
ISSN:
0171-8630
Resumen:
Several satellite models classify phytoplankton functional types (PFT) based on cell
size. In this study we used field data from the Argentine Sea on both the photosynthetic and the
bio-optical properties of phytoplankton to distinguish photosynthetic and bio-optical phytoplankton
types (PBPT). Cluster analyses were run using data from 70 stations sampled during 3 periods
to distinguish different PBPT, and principal component analysis was used to describe them. We
examined the main taxonomic composition and percentage of chl a in the <5 ìm size fraction
found within the PBPT. The distribution of PBPT in relation to hourly primary production and environmental
conditions was also investigated. The results showed a high degree of variability in biooptical
and photosynthetic properties, e.g. the specific absorption coefficient of phytoplankton,a in the <5 ìm size fraction
found within the PBPT. The distribution of PBPT in relation to hourly primary production and environmental
conditions was also investigated. The results showed a high degree of variability in biooptical
and photosynthetic properties, e.g. the specific absorption coefficient of phytoplankton,
aB
ph(440), varied between 0.015 and 0.067 m2 (mg chl a)−1, and the maximum production at light
saturation, PB
m, varied between 0.68 and 10.05 mg C (mg chl a)−1 h−1. This resulted in the discrimination
of 11 PBPT. Some had similar average cell sizes but differed in their bio-optical or photosynthetic
characteristics, e.g. PBPT1 (with diatoms <5 ìm and Emiliania huxleyi 2?5 ìm) and
PBPT6 (with diatoms <5 ìm and coccal cells ~2 ìm) had markedly different PB
m values (PBPT1:
1.20 mg C (mg chl a)−1 h−1 and PBPT6: 6.71 mg C (mg chl a)−1 h−1). This variability in the bio-optical
and physiological properties is most likely the result of adaptation by phytoplankton communities
to the high heterogeneity in environmental conditions in this region. These results indicate that
satellite models describing the distribution of PFT based on cell size alone will not provide a realistic
representation of the phytoplankton composition in this highly productive and heterogeneous area.B
ph(440), varied between 0.015 and 0.067 m2 (mg chl a)−1, and the maximum production at light
saturation, PB
m, varied between 0.68 and 10.05 mg C (mg chl a)−1 h−1. This resulted in the discrimination
of 11 PBPT. Some had similar average cell sizes but differed in their bio-optical or photosynthetic
characteristics, e.g. PBPT1 (with diatoms <5 ìm and Emiliania huxleyi 2?5 ìm) and
PBPT6 (with diatoms <5 ìm and coccal cells ~2 ìm) had markedly different PB
m values (PBPT1:
1.20 mg C (mg chl a)−1 h−1 and PBPT6: 6.71 mg C (mg chl a)−1 h−1). This variability in the bio-optical
and physiological properties is most likely the result of adaptation by phytoplankton communities
to the high heterogeneity in environmental conditions in this region. These results indicate that
satellite models describing the distribution of PFT based on cell size alone will not provide a realistic
representation of the phytoplankton composition in this highly productive and heterogeneous area.(440), varied between 0.015 and 0.067 m2 (mg chl a)−1, and the maximum production at light
saturation, PB
m, varied between 0.68 and 10.05 mg C (mg chl a)−1 h−1. This resulted in the discrimination
of 11 PBPT. Some had similar average cell sizes but differed in their bio-optical or photosynthetic
characteristics, e.g. PBPT1 (with diatoms <5 ìm and Emiliania huxleyi 2?5 ìm) and
PBPT6 (with diatoms <5 ìm and coccal cells ~2 ìm) had markedly different PB
m values (PBPT1:
1.20 mg C (mg chl a)−1 h−1 and PBPT6: 6.71 mg C (mg chl a)−1 h−1). This variability in the bio-optical
and physiological properties is most likely the result of adaptation by phytoplankton communities
to the high heterogeneity in environmental conditions in this region. These results indicate that
satellite models describing the distribution of PFT based on cell size alone will not provide a realistic
representation of the phytoplankton composition in this highly productive and heterogeneous area.PB
m, varied between 0.68 and 10.05 mg C (mg chl a)−1 h−1. This resulted in the discrimination
of 11 PBPT. Some had similar average cell sizes but differed in their bio-optical or photosynthetic
characteristics, e.g. PBPT1 (with diatoms <5 ìm and Emiliania huxleyi 2?5 ìm) and
PBPT6 (with diatoms <5 ìm and coccal cells ~2 ìm) had markedly different PB
m values (PBPT1:
1.20 mg C (mg chl a)−1 h−1 and PBPT6: 6.71 mg C (mg chl a)−1 h−1). This variability in the bio-optical
and physiological properties is most likely the result of adaptation by phytoplankton communities
to the high heterogeneity in environmental conditions in this region. These results indicate that
satellite models describing the distribution of PFT based on cell size alone will not provide a realistic
representation of the phytoplankton composition in this highly productive and heterogeneous area., varied between 0.68 and 10.05 mg C (mg chl a)−1 h−1. This resulted in the discrimination
of 11 PBPT. Some had similar average cell sizes but differed in their bio-optical or photosynthetic
characteristics, e.g. PBPT1 (with diatoms <5 ìm and Emiliania huxleyi 2?5 ìm) and
PBPT6 (with diatoms <5 ìm and coccal cells ~2 ìm) had markedly different PB
m values (PBPT1:
1.20 mg C (mg chl a)−1 h−1 and PBPT6: 6.71 mg C (mg chl a)−1 h−1). This variability in the bio-optical
and physiological properties is most likely the result of adaptation by phytoplankton communities
to the high heterogeneity in environmental conditions in this region. These results indicate that
satellite models describing the distribution of PFT based on cell size alone will not provide a realistic
representation of the phytoplankton composition in this highly productive and heterogeneous area.Emiliania huxleyi 2?5 ìm) and
PBPT6 (with diatoms <5 ìm and coccal cells ~2 ìm) had markedly different PB
m values (PBPT1:
1.20 mg C (mg chl a)−1 h−1 and PBPT6: 6.71 mg C (mg chl a)−1 h−1). This variability in the bio-optical
and physiological properties is most likely the result of adaptation by phytoplankton communities
to the high heterogeneity in environmental conditions in this region. These results indicate that
satellite models describing the distribution of PFT based on cell size alone will not provide a realistic
representation of the phytoplankton composition in this highly productive and heterogeneous area.PB
m values (PBPT1:
1.20 mg C (mg chl a)−1 h−1 and PBPT6: 6.71 mg C (mg chl a)−1 h−1). This variability in the bio-optical
and physiological properties is most likely the result of adaptation by phytoplankton communities
to the high heterogeneity in environmental conditions in this region. These results indicate that
satellite models describing the distribution of PFT based on cell size alone will not provide a realistic
representation of the phytoplankton composition in this highly productive and heterogeneous area.values (PBPT1:
1.20 mg C (mg chl a)−1 h−1 and PBPT6: 6.71 mg C (mg chl a)−1 h−1). This variability in the bio-optical
and physiological properties is most likely the result of adaptation by phytoplankton communities
to the high heterogeneity in environmental conditions in this region. These results indicate that
satellite models describing the distribution of PFT based on cell size alone will not provide a realistic
representation of the phytoplankton composition in this highly productive and heterogeneous area.a)−1 h−1 and PBPT6: 6.71 mg C (mg chl a)−1 h−1). This variability in the bio-optical
and physiological properties is most likely the result of adaptation by phytoplankton communities
to the high heterogeneity in environmental conditions in this region. These results indicate that
satellite models describing the distribution of PFT based on cell size alone will not provide a realistic
representation of the phytoplankton composition in this highly productive and heterogeneous area.