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Titolo:
Effects of environmental change on plant species density: Comparing predictions with experiments
Autore:
Gough, L; Grace, JB;
Indirizzi:
Louisiana State Univ, Dept Plant Biol, Baton Rouge, LA 70803 USA LouisianaState Univ Baton Rouge LA USA 70803 , Baton Rouge, LA 70803 USA US Geol Survey, Natl Wetlands Res Ctr, Lafayette, LA 70506 USA US Geol Survey Lafayette LA USA 70506 ds Res Ctr, Lafayette, LA 70506 USA
Titolo Testata:
ECOLOGY
fascicolo: 3, volume: 80, anno: 1999,
pagine: 882 - 890
SICI:
0012-9658(199904)80:3<882:EOECOP>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRODUCTIVITY GRADIENTS; SALT-MARSH; RICHNESS; LOUISIANA; SALINITY; BIOMASS; HYPOTHESES; GRASSLAND; COMMUNITY; GROWTH;
Keywords:
biomass; coastal marsh; disturbance; flooding; herbivory; nutrient enrichment; salinity; species density; structural equation modeling;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Gough, L Univ Alabama, Dept Biol Sci, Tuscaloosa, AL 35487 USA Univ Alabama Tuscaloosa AL USA 35487 i, Tuscaloosa, AL 35487 USA
Citazione:
L. Gough e J.B. Grace, "Effects of environmental change on plant species density: Comparing predictions with experiments", ECOLOGY, 80(3), 1999, pp. 882-890

Abstract

Ideally, general ecological relationships may be used to predict responsesof natural communities to environmental change, but few attempts have beenmade to determine the reliability of predictions based on descriptive data. Using a previously published structural equation model (SEM) of descriptive data from a coastal marsh landscape, we compared these predictions against observed changes in plant species density resulting from field experiments (manipulations of soil fertility, flooding, salinity, and mammalian herbivory) in two areas within the same marsh. In general, observed experimental responses were fairly consistent with predictions. The largest discrepancy occurred when sods were transplanted from high- to low-salinity sites and herbivores selectively consumed a particularly palatable plant species in the transplanted sods. Individual plot responses to some treatments were predicted more accurately than others. Individual fertilized plot responses were not consistent with predictions (P > 0.05), nor were fenced plots (herbivore exclosures; R-2 = 0.15) compared to unfenced plots (R-2 = 0.53). For the remaining treatments, predictions reasonably matched responses (R-2 = 0.63). We constructed an SEM for the experimental data; it explained 60% of the variance in species density and showed that fencing and fertilization led todecreases in species density that were not predicted from treatment effects on community biomass or observed disturbance levels. These treatments mayhave affected the ratio of live to dead biomass, and competitive exclusionlikely decreased species density in fenced and fertilized plots. We conclude that experimental validation is required to determine the predictive value of comparative relationships derived from descriptive data.

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Documento generato il 10/07/20 alle ore 02:52:00