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Titolo:
The ghost of granivory past
Autore:
Howe, HF; Brown, JS;
Indirizzi:
Univ Illinois, Dept Biol Sci MIC 066, Chicago, IL 60607 USA Univ IllinoisChicago IL USA 60607 iol Sci MIC 066, Chicago, IL 60607 USA
Titolo Testata:
ECOLOGY LETTERS
fascicolo: 4, volume: 4, anno: 2001,
pagine: 371 - 378
SICI:
1461-023X(200107)4:4<371:TGOGP>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
YELLOWSTONE-NATIONAL-PARK; PLANT-SPECIES RICHNESS; TALLGRASS PRAIRIE; SEEDLING SURVIVAL; NITROGEN DYNAMICS; OLD FIELDS; COMMUNITIES; ECOSYSTEMS; GRASSLAND; HERBIVORY;
Keywords:
branivory; Microtus; plant community; prairie; seed-size selection; Silphium; vole;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
52
Recensione:
Indirizzi per estratti:
Indirizzo: Howe, HF Univ Illinois, Dept Biol Sci MIC 066, 845 W Taylor St, Chicago, IL 60607 USA Univ Illinois 845 W Taylor St Chicago IL USA 60607 , IL 60607 USA
Citazione:
H.F. Howe e J.S. Brown, "The ghost of granivory past", ECOL LETT, 4(4), 2001, pp. 371-378

Abstract

We report a 36-month echo of vole (Microtus pennsylvanicus) seed-selectionin the composition of synthetic forb communities in Wisconsin. An initial study showed direct suppression of an exceptionally large-seeded (seed > 15mg) species (Silphium integrifolium, Asteraceae) by seed-size predation byrodents during the winter, resulting in indirect release of small-seeded (seed less than or equal to 1.5 mg) species. Twelve months after planting, plant diversities (Simpson's D) were 33% higher in plots exposed to winter seed selection by rodents. Thirty-six months after planting, Silphium integrifolium had almost equalized densities in rodent access (20.8 +/- 4.1 m(-2)) and exclusion (29.0 +/- 5.2 m(-2)) plots, but still suppressed both large-seeded (greater than or equal to 3.5 mg) and small-seeded (less than or equal to 1.5 mg) species (F-1,F-16=11.84 and F-1,F-16=10.42, P less than or equal to 0.005, respectively). A multivariate analysis of covariance (MANCOVA) distinguished effects of Silphium integrifolium (Wilk's lambda P=0.029) from echoes of earlier winter granivory (Wilk's lambda P=0.014). Thirty months after rodent exclusion, diversity (D) remained 27% higher in plots onceopened to winter granivory (adjusted mean 4.70 +/- 0.37 SE) as compared with closed plots (3.70 +/- 0.26; F-1,F-16=5.12, P < 0.05). Echoes of earliergranivory remained after rodent-induced imbalances in the abundances of the competitive driver of this system, Silphium integrifolium, all but disappeared.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 11:42:51