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Titolo:
Assessment of the effects of logging, forest fires and drought on lakes innorthwestern Ontario: a 30-year paleolimnological perspective
Autore:
Paterson, AM; Cumming, BF; Smol, JP; Blais, JM; France, RL;
Indirizzi:
QueensONniv, Dept Biol, Paleoecol Environm Assessment & Res Lab, Kingston,Queens Univ Kingston ON Canada K7L 3N6 nm Assessment & Res Lab, Kingston, Univ Alberta, Dept Biol Sci, Edmonton, AB T6G 2E9, Canada Univ Alberta Edmonton AB Canada T6G 2E9 Sci, Edmonton, AB T6G 2E9, Canada Harvard Univ, Grad Sch Design, Cambridge, MA 02138 USA Harvard Univ Cambridge MA USA 02138 d Sch Design, Cambridge, MA 02138 USA
Titolo Testata:
CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE
fascicolo: 10, volume: 28, anno: 1998,
pagine: 1546 - 1556
SICI:
0045-5067(199810)28:10<1546:AOTEOL>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRECAMBRIAN SHIELD LAKES; CLIMATE-INDUCED CHANGES; RIPARIAN DEFORESTATION; BOREAL FOREST; NEW-YORK; CHRYSOPHYCEAE; USA; SEDIMENTS; STREAMS; ACIDIFICATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
70
Recensione:
Indirizzi per estratti:
Indirizzo: Paterson, AM QueensONniv, Dept Biol, Paleoecol Environm Assessment & Res Lab, Kingston, Queens Univ Kingston ON Canada K7L 3N6 & Res Lab, Kingston,
Citazione:
A.M. Paterson et al., "Assessment of the effects of logging, forest fires and drought on lakes innorthwestern Ontario: a 30-year paleolimnological perspective", CAN J FORES, 28(10), 1998, pp. 1546-1556

Abstract

The frequency and intensity of large-scale watershed disturbances (e.g., clearcuts and wildfires) is increasing in northwestern Ontario. Timber harvesting and wildfires have been shown to alter water quantity and quality in stream ecosystems. Unfortunately, scientific studies of these impacts on lakes are considerably rarer. Using paleolimnological techniques, we examinedthe remains of scaled chrysophytes in sediment cores from four lakes that have had the majority of their watersheds clearcut, two lakes that have hadlarge forest fires in their watersheds, and two lakes that have had minimal watershed disturbance. Lakes in this study showed minor changes in the composition of scaled chrysophytes at a temporal resolution of 2-4 years, despite removal of over 90% of the forest. Furthermore, temporal variability in the species assemblages were similar in all lakes. A gradual change in the species assemblages of all lakes suggested a regional influence may have been responsible. We hypothesize that hydrological changes brought about bya regional drought from 1970 to 1990 may have exerted an overriding influence on lakes over this time period.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 05:17:38