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Titolo:
Phytophagous insects and web-building spiders in relation to pasture vegetation complexity
Autore:
Borges, PAV; Brown, VK;
Indirizzi:
Univ London Imperial Coll Sci Technol & Med, NERC, Ctr Populat Biol, AscotSL5 7PY, Berks, England Univ London Imperial Coll Sci Technol & Med Ascot Berks England SL5 7PY d
Titolo Testata:
ECOGRAPHY
fascicolo: 1, volume: 24, anno: 2001,
pagine: 68 - 82
SICI:
0906-7590(200102)24:1<68:PIAWSI>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOWN CALCAREOUS GRASSLANDS; OLD FIELD SUCCESSION; ARTHROPOD DIVERSITY; PLANT ARCHITECTURE; SEASONAL-CHANGES; COMMUNITIES; HERBIVORY; HEMIPTERA; COLONIZATION; ORGANIZATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
53
Recensione:
Indirizzi per estratti:
Indirizzo: Borges, PAV Univ Acores, Dept Ciencias Agr, PL-9700 Terceira, Acores, Portugal Univ Acores Terceira Acores Portugal PL-9700 Acores, Portugal
Citazione:
P.A.V. Borges e V.K. Brown, "Phytophagous insects and web-building spiders in relation to pasture vegetation complexity", ECOGRAPHY, 24(1), 2001, pp. 68-82

Abstract

We investigate the potential use of structural characteristics of vegetation as predictors of the densities of pasture arthropods in three Azorean islands. Two types of upland pastures, recent sown pastures (3-4 yr old) and wet semi-natural old pastures (> 35 yr old), were studied in three Azorean islands (S. Maria, Terceira and Pico). Three arthropod assemblages. of particular importance in pasture habitats, were assessed: insect forb-feeders, insect grass-feeders and web-building spiders. These are numerically abundant and represent a range of feeding strategies. Point quadrats for plants and suction (Vortis) for arthropods were used as sampling methods. Several vegetation indices were investigated, but only three (cover abundance of perennial forbs, cover abundance of perennial grasses and the total vegetationalpha-diversity) were good predictors of invertebrate abundance. Vegetation structure, defined by a Height Index, was of minor predictive value. In sown and semi-natural pastureland. diverse and structurally complex pasture sites support more individual insect forb-feeders. grass-feeders and web-building spiders per unit area than less complex ones.

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Documento generato il 23/09/20 alle ore 12:50:25