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Titolo:
THE EFFECTS OF HYDROPSYCHID COLONIZATION ON ALGAL RESPONSE TO NUTRIENT ENRICHMENT IN A SMALL MICHIGAN STREAM, USA
Autore:
PAN YD; LOWE RL;
Indirizzi:
UNIV LOUISVILLE,WATER RESOURCES LAB LOUISVILLE KY 40292 BOWLING GREEN STATE UNIV,DEPT BIOL SCI BOWLING GREEN OH 43403
Titolo Testata:
Freshwater Biology
fascicolo: 3, volume: 33, anno: 1995,
pagine: 393 - 400
SICI:
0046-5070(1995)33:3<393:TEOHCO>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
FILTER-FEEDING INSECTS; LABORATORY STREAMS; DIATOM COMMUNITIES; SUBSTRATE RELIEF; PERIPHYTON; GROWTH; PHOTOSYNTHESIS; PHYTOPLANKTON; TRICHOPTERA; IRRADIANCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
Y.D. Pan e R.L. Lowe, "THE EFFECTS OF HYDROPSYCHID COLONIZATION ON ALGAL RESPONSE TO NUTRIENT ENRICHMENT IN A SMALL MICHIGAN STREAM, USA", Freshwater Biology, 33(3), 1995, pp. 393-400

Abstract

1. We tested the hypothesis that the indirect effects of colonizationby Hydropsyche spp. (Trichoptera: Hydropsychidae) may be greater thandirect effects of nutrients on the benthic algal community growth. Two sets of nutrient-releasing substrates (a total of twenty-few) were deployed into a small pristine stream in northern Michigan. Each set was composed of four treatments replicated three times: (i) no nutrient enrichment (C), (ii) 0.5 M phosphate-P enrichment (P), (iii) 0.5 M nitrate-N enrichment (N) and (iv) 0.5 M phosphate-P plus 0.5 M nitrate-N enrichment (P + N). All hydropsychids colonizing on the substrate in one set (twelve substrates) were removed regularly and the other set (twelve substrates) with undisturbed hydropsychids served as the controls. 2. Algal biomass and gross primary productivity were estimated as chlorophyll a (chi a) concentration, algal biovolume, and carbon fixation rate, respectively. There was a significant interactive effect of hydropsychid colonization and P enrichment on algal biomass measured aschi a concentration. With removal of hydropsychids, chi a concentration increased Ii-fold in the P enrichment treatments relative to the controls. The effects of P on chi a was, however, not significant in thepresence of hydropsychids. Such interactive effects were not observedwhen algal responses were measured as biovolume and carbon fixation rate (GPP). 3. It is recommended that algal responses to nutrient enrichment should be measured as biovolume or carbon fixation rate in smallstreams where hydropsychids are commonly present.

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Documento generato il 04/04/20 alle ore 13:02:20