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Titolo:
THE EFFECT OF SALINITY ON THE REPRODUCTION OF COASTAL SUBMERGED MACROPHYTES IN EXPERIMENTAL COMMUNITIES
Autore:
BONIS A; GRILLAS P; VANWIJCK C; LEPART J;
Indirizzi:
STN BIOL TOUR VALAT,LE SAMBUC F-13200 ARLES FRANCE STN BIOL TOUR VALAT,LE SAMBUC F-13200 ARLES FRANCE
Titolo Testata:
Journal of vegetation science
fascicolo: 4, volume: 4, anno: 1993,
pagine: 461 - 468
SICI:
1100-9233(1993)4:4<461:TEOSOT>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Keywords:
BIOMASS; GRADIENT; MEDITERRANEAN; POPULATION DYNAMICS; REPRODUCTIVE EFFORT; SEASONAL COASTAL MARSH; SEED;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
NO
Recensione:
Indirizzi per estratti:
Citazione:
A. Bonis et al., "THE EFFECT OF SALINITY ON THE REPRODUCTION OF COASTAL SUBMERGED MACROPHYTES IN EXPERIMENTAL COMMUNITIES", Journal of vegetation science, 4(4), 1993, pp. 461-468

Abstract

The effects of salinity on the reproduction of coastal submerged macrophyte species were studied on samples of communities from six seasonal marshes in two outdoor experiments performed in autumn and in spring. The submerged macrophyte communities were submitted to five different salinity levels (0, 1, 2, 4 and 6 g/l Cl-). In a companion paper (Grillas, van Wijck & Bonis 1993) three groups of species were distinguished on the basis of their biomass production over the salinity range 0to 6 g/l Cl-: (1) glycophytes (non-salt-tolerant species), (2) salt-tolerant species and (3) halophytes. This part of the study describes the impact of salinity on the reproduction of the individual species during the two experiments. The species differ in their capacity to reproduce in the autumn; only Zannichellia pedunculata and Tolypella hispanica were able to produce fruits in that season. For all species reproduction was greater in spring and strongly correlated with biomass, except for Chara canescens. Differences in reproductive effort over the salinity range amplified the halophytic nature of Ruppia maritima and Chara canescens and the intolerance of Callitriche truncata and Chara contraria. For the other species, reproductive effort did not differ significantly over the salinity range. Regarding the effect of salinityon biomass and reproductive effort of individual species, there were large differences in the total weight of propagules produced at the community level and in the relative contribution of individual species. The resulting quantitative changes in the species composition of the seed bank could affect the structure of the communities by their effects on the establishment and survival of species populations.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/07/20 alle ore 23:06:07