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Titolo:
HABITAT PARTITIONING IN RIVERINE MACROPHYTE COMMUNITIES
Autore:
FRENCH TD; CHAMBERS PA;
Indirizzi:
NATL HYDROL RES INST,11 INNOVAT BLVD SASKATOON SK S7N 3H5 CANADA UNIV ALBERTA,DEPT BIOL SCI EDMONTON AB T6G 2E9 CANADA
Titolo Testata:
Freshwater Biology
fascicolo: 3, volume: 36, anno: 1996,
pagine: 509 - 520
SICI:
0046-5070(1996)36:3<509:HPIRMC>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
NICHE OVERLAP; SPECIES COEXISTENCE; GOPHER DISTURBANCE; PLANT-COMMUNITIES; TROPICAL FORESTS; PATCHY HABITATS; DIVERSITY; VARIABILITY; COMPETITION; ENVIRONMENTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
64
Recensione:
Indirizzi per estratti:
Citazione:
T.D. French e P.A. Chambers, "HABITAT PARTITIONING IN RIVERINE MACROPHYTE COMMUNITIES", Freshwater Biology, 36(3), 1996, pp. 509-520

Abstract

1. Habitat partitioning has been extensively studied in terrestrial plant communities. By comparison, few studies have examined habitat partitioning in riverine macrophyte communities. Riverine environments are often highly heterogeneous with respect to current speed, depth, bottom sediment fertility and other biologically important properties. Thus, the potential for habitat partitioning in riverine macrophyte communities is great. 2. The objective of this study was to investigate how, or if, macrophyte species are differentially distributed with respect to abiotic gradients in a large river in central British Columbia, Canada. 3. A survey of macrophyte biomass and associated measures of current speed, depth and sediment texture showed that coexistence occurred both with and without habitat partitioning. 4. Coexistence in the absence of habitat partitioning was depicted by Potamogeton gramineus,Potamogeton berchtoldii, Myriophyllum exalbescens, Callitriche hermaphroditica and Potamogeton pectinatus such that they had a minimum and average niche overlap (NO) of 65% and 84%, respectively, for all measured abiotic variables. Similarly, the spatial niche of E. canadensis was close to that of Ceratophyllum demersum and M. exalbescens. 5. While several taxa seemed to occupy the same spatial niche, some taxa weredistinguished from one another in terms of the types of microhabitatsthey utilized. Mosses, for example, were often the only occupants of sites having current speeds greater than 0.6 m s(-1) and substrates ofbare rock. Ranunculus aquatilis was most abundant at sites having current speeds between 0.4 and 0.6 m s(-1) whereas most other taxa were restricted to slower waters. Habitat partitioning across depth contours, which occurred between several taxa, was most evident between P. pectinatus and C. demersum (NO=17%), C. hermaphroditica and C. demersum (NO=3%), C. demersum and P. richardsonii (NO=19%) and C. hermaphroditica and E. canadensis (NO=29%).

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 07:05:53