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Titolo:
INTERACTION BETWEEN ALGAE AND SEED-GERMINATION IN TROPICAL DUNE SLACKSPECIES - A FACILITATION PROCESS
Autore:
VAZQUEZ G; MORENOCASASOLA P; BARRERA O;
Indirizzi:
INST ECOL,AC APDO POSTAL 63 XALAPA 91000 VERACRUZ MEXICO
Titolo Testata:
Aquatic botany
fascicolo: 4, volume: 60, anno: 1998,
pagine: 409 - 416
SICI:
0304-3770(1998)60:4<409:IBAASI>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRIMARY SUCCESSION; VEGETATION; MECHANISMS; DYNAMICS; PLANTS;
Keywords:
FACILITATION; GERMINATION; ALGAE; PHANEROGAMS; DUNE SLACK;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
22
Recensione:
Indirizzi per estratti:
Citazione:
G. Vazquez et al., "INTERACTION BETWEEN ALGAE AND SEED-GERMINATION IN TROPICAL DUNE SLACKSPECIES - A FACILITATION PROCESS", Aquatic botany, 60(4), 1998, pp. 409-416

Abstract

The importance of algae dune slack stabilisation has been extensivelyanalysed, but little has been done regarding their potentially favourable role in germination and establishment of phanerogams. Dune slack is a seasonal freshwater habitat that depends on water table level fluctuation. Our hypothesis is that in these highly unpredictable systems, algae maintain a certain degree of humidity in the soil and, thus, permit phanerogam germination and establishment. The objective of this study was to compare the germination of four species characteristic oftropical dune systems: Cyperus articulatus L., Fimbristylis cymosa R. Br., Fuirena simplex Vahl and Rhynchospora colorata (L. ) Pfeiffer, indifferent substrates and degrees of humidity. For germination trials,seeds of the four species were placed each on three substrates: in sand (control), filamentous algae on sand and cotton on sand. Two irrigation protocols were followed: continual watering (wet treatment) and weekly watering (dry treatment). Each week during a 21-week period, thenumber of germinated seeds from each species was recorded. The highest percentage of germination for the four species was observed during wet treatment. C. articulatus had the highest germination rate of the four species in algae (70%), and cotton (51%) on sand. Highest germination for F. simplex, F. cymosa and R. colorata took place in algae, although the percentages were very low. Differences in germination between the three substrates for these species were statistically significant (P < 0.05). During dry treatment, C. articulatus was the only species that exhibited a significant germination, principally in algae and cotton. The results suggest that algae maintain substrate humidity and favour germination of the four species. This could be important in sand dune slacks where marked fluctuations in temperature and humidity occur. (C) 1998 Published by Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 08:56:11