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Titolo:
Photosynthetic characteristics of sub-tidal benthic microalgal populationsfrom a temperate, shallow water marine ecosystem
Autore:
Light, BR; Beardall, J;
Indirizzi:
Monash Univ, Dept Sci Biol, Clayton, Vic 3168, Australia Monash Univ Clayton Vic Australia 3168 Biol, Clayton, Vic 3168, Australia
Titolo Testata:
AQUATIC BOTANY
fascicolo: 1, volume: 70, anno: 2001,
pagine: 9 - 27
SICI:
0304-3770(200105)70:1<9:PCOSBM>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIGHT-INTENSITY; SHORT-TERM; SEDIMENTS; MICROPHYTOBENTHOS; IRRADIANCE; ALGAE; BAY; PRODUCTIVITY; DENITRIFICATION; NITRIFICATION;
Keywords:
benthic microalgae; photosynthesis; P-I parameters; Port Phillip Bay; sub-tidal;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Light, BR Environm Protect Author, 27 Francis St, Melbourne, Vic 3000, Australia Environm Protect Author 27 Francis St Melbourne Vic Australia 3000
Citazione:
B.R. Light e J. Beardall, "Photosynthetic characteristics of sub-tidal benthic microalgal populationsfrom a temperate, shallow water marine ecosystem", AQUATIC BOT, 70(1), 2001, pp. 9-27

Abstract

The photosynthetic characteristics (alpha (B), P-max(B) and I-k) of sub-tidal benthic microalgal populations from Port Phillip Bay, southern Australia, have been examined using an oxygen exchange procedure from intact sediment cores. Photosynthesis-irradiance (P-I) parameters were measured at two water depths and three sites over the course of an annual cycle, enabling strategies for spatial and temporal (seasonal) photoacclimation to be determined. The respective roles of photosynthetic photon flux density (PPFD) and water temperature in regulating P-I parameters are also discussed. The benthic microalgal population exhibited marked acclimation to in situ PPFD, which varied as a function of seasonality, water depth and site. Examples of benthic microalgal photoacclimation strategies based on an increase in photosynthetic unit size are evident in Port Phillip Bay. P-I parameters followed a unimodal seasonal pattern with maximum values generally occurring in the late spring to early autumn period and minimum values generally occurringthroughout winter months. A strong relationship exists between P-max(B) and alpha (B), which is independent of PPFD and temperature. Variation in benthic microalgal P-max(B) was determined principally by variation in PPFD whereas water temperature exerted the greatest influence on alpha (B). Both parameters combine in the form of the parameter I-k which provides an accurate photoacclimation index in Port Phillip Bay. Compared to deep water sites, shallow water sites gave poor spatial and temporal signals, indicating the importance of environmental factors other than PPFD in regulating P-I parameters in these physically constrained habitats. (C) 2001 Elsevier ScienceB.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 07:03:40