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Titolo:
Hydrologic influences on insect emergence production from central Platte River wetlands
Autore:
Whiles, MR; Goldowitz, BS;
Indirizzi:
Kansas State Univ, Dept Entomol, Manhattan, KS 66506 USA Kansas State Univ Manhattan KS USA 66506 Entomol, Manhattan, KS 66506 USA Platte River Whooping Crane Maintenance Trust Inc, Wood River, NE 68883 USA Platte River Whooping Crane Maintenance Trust Inc Wood River NE USA 68883
Titolo Testata:
ECOLOGICAL APPLICATIONS
fascicolo: 6, volume: 11, anno: 2001,
pagine: 1829 - 1842
SICI:
1051-0761(200112)11:6<1829:HIOIEP>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
AQUATIC INSECTS; MANAGEMENT STRATEGIES; CHIRONOMIDAE DIPTERA; SPECIES-DIVERSITY; STREAM; HABITATS; COMMUNITIES; BIODIVERSITY; DISTURBANCE; ABUNDANCE;
Keywords:
aquatic invertebrates; central Platte River (USA); disturbance; diversity; floodplain; hydrology; insect emergence; productivity; wetland management; wetlands;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
71
Recensione:
Indirizzi per estratti:
Indirizzo: Whiles, MR So Illinois Univ, Dept Zool, Carbondale, IL 62901 USA So Illinois Univ Carbondale IL USA 62901 bondale, IL 62901 USA
Citazione:
M.R. Whiles e B.S. Goldowitz, "Hydrologic influences on insect emergence production from central Platte River wetlands", ECOL APPL, 11(6), 2001, pp. 1829-1842

Abstract

The physical template of freshwater ecosystems has a pervasive influence on biological communities and processes. To examine the influence of hydrology on wetland insect communities, we quantified insect emergence from five riparian sloughs in the central Platte River valley. Annual hydroperiods ofthe wetlands ranged from 94 to 365 d/yr, and frequency and magnitude of drying events were inversely proportional to hydroperiod length. Three emergence traps were placed in each wetland from April through November 1997. Most insects collected in traps were identified to genus, and individual dry mass (DM) also was determined. Abundance of emerging insects (24 124 individuals/m(2)) and emergence production (5.1 g DM.m(-2).yr(-1)) were highest from the site with an intermediate hydroperiod of 296 d. Sites with longer and shorter hydroperiods had lower emergence abundance and production. Emergence production front the perennial site, which contained fish year-round, was only 0.26 g DM.m(-2).yr(-1). Diptera generally dominated emergence trap catches. Chironomidae, Culicidae, and Ceratopogonidae were among the dominant contributors to abundance, whereas Sciomyzidae and Muscidae were important contributors to biomass at most sites. Quadratic equations best described relationships between taxa richness andannual hydroperiod (r(2) = 0.78 P < 0.05) or number of drying events/yr (r(2) = 0.81, P < 0.05), reflecting a peak in richness at intermediate levelsof both. These relationships followed predictions of the intermediate disturbance hypothesis, but specific mechanisms underlying patterns were difficult to discern. Like emergence production, taxa richness was also highest at intermediate hydroperiods. Hence, insect diversity (measured as richness)and emergence production were positively correlated (r(2) = 0.85, P < 0.05). Results indicate that the hydrology of central Platte River wetlands exerts a strong influence on insect species richness and emergence production,and that intermittent sites harbor the highest insect diversity and produce more emergent insect biomass. However, trends in seasonal emergence patterns and taxonomic shifts across the hydrologic gradient in this study suggest that a landscape containing a mosaic of hydrologically distinct wetlandswill maximize aquatic insect diversity and productivity at larger spatial and temporal scales.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/04/20 alle ore 00:15:05