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Titolo:
Competition between the tropical alga, Halimeda incrassata, and the seagrass, Thalassia testudinum
Autore:
Davis, BC; Fourqurean, JW;
Indirizzi:
Florida Int Univ, Dept Biol Sci, Miami, FL 33199 USA Florida Int Univ Miami FL USA 33199 v, Dept Biol Sci, Miami, FL 33199 USA Florida Int Univ, SE Environm Res Ctr, Miami, FL 33199 USA Florida Int Univ Miami FL USA 33199 Environm Res Ctr, Miami, FL 33199 USA
Titolo Testata:
AQUATIC BOTANY
fascicolo: 3, volume: 71, anno: 2001,
pagine: 217 - 232
SICI:
0304-3770(200111)71:3<217:CBTTAH>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTERSPECIFIC COMPETITION; HALODULE-WRIGHTII; FIELD EXPERIMENTS; ADDITIVE DESIGNS; FLORIDA BAY; GROWTH; SEDIMENT; REPLACEMENT; HERBIVORY; NITROGEN;
Keywords:
caulerpales; competition; Halimeda incrassata; productivity; seagrass; Thalassia testudinum;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Fourqurean, JW Florida Int Univ, Dept Biol Sci, Miami, FL 33199 USA Florida Int Univ Miami FL USA 33199 i, Miami, FL 33199 USA
Citazione:
B.C. Davis e J.W. Fourqurean, "Competition between the tropical alga, Halimeda incrassata, and the seagrass, Thalassia testudinum", AQUATIC BOT, 71(3), 2001, pp. 217-232

Abstract

In this study, we experimentally investigate the interspecific interactions operating between the dominant seagrass and an abundant, native rhizophytic macroalga within a mature seagrass community. Treatments consisted of density manipulations of the dominant seagrass species, Thalassia testudinum,and of the most common representative of the rhizophytic algae, Halimeda incrassata. Evidence of interaction was measured by changes in relative short-term productivity and biomass of both algae and seagrass over a 4-month period. There was an asymmetrical effect of density manipulation: the presence of seagrass decreased the size of algal thalli by 20.4% and the macroalgal growth rate by 33.3%, but the presence of macroalgae had no significant impact on seagrass growth rate and decreased the mean size of short-shoots of T. testudinum by only 10.3%. These results support a competitive interaction theory for T testudinum and rhizophytic macroalgae. Nutrient and lightlimitation were investigated as possible underlying mechanisms of the interaction. Seagrass leaf tissue ON was significantly lower (P = 0.06) in algal removal treatments whereas no significant treatment effect was demonstrated for substrate-level irradiance, suggesting that competition for N was the mechanism of the interaction. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 28/09/20 alle ore 01:59:18