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Titolo:
PHOTOSYNTHETIC CHARACTERISTICS AND C N RATIOS OF MACROALGAE FROM KING-GEORGE ISLAND (ANTARCTICA)/
Autore:
WEYKAM G; GOMEZ I; WIENCKE C; IKEN K; KLOSER H;
Indirizzi:
ALFRED WEGENER INST POLAR & MARINE RES D-27515 BREMERHAVEN GERMANY ALFRED WEGENER INST POLAR & MARINE RES D-27515 BREMERHAVEN GERMANY
Titolo Testata:
Journal of experimental marine biology and ecology
fascicolo: 1-2, volume: 204, anno: 1996,
pagine: 1 - 22
SICI:
0022-0981(1996)204:1-2<1:PCACNR>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIMANTOTHALLUS-GRANDIFOLIUS DESMARESTIALES; INDEPENDENT CARBON FIXATION; LONG-TERM CULTURE; TEMPERATURE REQUIREMENTS; MARINE MACROALGAE; ASCOSEIRA-MIRABILIS; SEASONAL-VARIATION; SIGNY-ISLAND; LIFE-HISTORY; GROWTH;
Keywords:
ANTARCTICA; C-N RATIO; DEPTH; LIFE STRATEGIES; MACROALGAE; PHOTOSYNTHESIS; THALLUS STRUCTURE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
67
Recensione:
Indirizzi per estratti:
Citazione:
G. Weykam et al., "PHOTOSYNTHETIC CHARACTERISTICS AND C N RATIOS OF MACROALGAE FROM KING-GEORGE ISLAND (ANTARCTICA)/", Journal of experimental marine biology and ecology, 204(1-2), 1996, pp. 1-22

Abstract

During an expedition to King George Island, the photosynthetic characteristics of 36 macroalgal species common to the South Shetland Islands (Antarctica) have been investigated. Plant material was sampled during Antarctic spring by scuba diving in the area of Maxwell Bay. Photosynthesis versus irradiance curves were obtained by determination of oxygen consumption or production of the species. Rates of maximum photosynthesis (P-max) were similar to P-max rates measured in earlier fieldand laboratory studies of Antarctic species. The present investigation shows that the photosynthetic characteristics of Antarctic macroalgae are clearly related to thallus structure, with highest rates of P-max, photosynthetic efficiency (alpha) and dark respiration and highest Chl a contents being observed in filamentous and foliose species. The light requirements of most studied species are generally low as indicated by the high alpha (0.2-4.4 mu mol O-2 g(-1) h(-1) (mu mol s(-1) m(-2))(-1)) as well as low values for intial saturation of photo synthesis (Ik values) (14-49 mu mol m(-2) s(-1)) and low compensation points (Ic values) (4.5-14.7 mu mol m(-2) s(-1)), important prerequisites forsurvival in Antarctic waters especially with regard to the long periods of dim light. In some deep water species cw was particularly high compared to species from the upper sublittoral. Some intertidal species, however, were characterised by both high alpha and high P-max values. The C:N ratios were significantly lower in the filamentous and foliose compared to the terete and leathery species. Tn general, low valuesof between five and ten were determined reflecting the high inorganicN supply found in Antarctic waters.

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Documento generato il 06/04/20 alle ore 19:27:58