Document of bibliographic reference 70624

BibliographicReference record

Type

Bibliographic resource

Type of document

Journal article

BibLvlCode

AS

Title

Contrasting effects of mean intensity and temporal variation of disturbance on assemblages of rocky shores

Abstract

Understanding the extent to which natural assemblages withstand changes in the regime of disturbance has considerable practical and theoretical interest. In this paper we examine the separate and interactive effects of intensity, temporal variation and spatial extent of disturbance on temporal variance in assemblages of algae and invertebrates of rocky shores in the north-west Mediterranean. Temporal variation of disturbance is a predictor variable in the experiment, whilst temporal variance in abundance and number of taxa and in structure of assemblages are response variables. Multivariate analyses detected a positive relationship between intensity of disturbance and temporal variance in the structure of assemblages, whilst temporal variation of disturbance elicited the opposite effect. Univariate analyses conducted on the most abundant taxa revealed idiosyncratic patterns, while temporal variance in mean number of taxa was greatly reduced by disturbance, with no distinction among levels of intensity, temporal variation or spatial extent. These outcomes suggest caution in interpreting the results of experiments in which intensity and temporal variation of disturbance can not be separated. Distinguishing between these traits of disturbance may be key to predict the ecological consequence of environmental fluctuations, including those expected under modified climate scenarios.

Bibliographic citation

Bertocci, I.; Maggi, E.; Vaselli, S.; Benedetti-Cecchi, L. (2005). Contrasting effects of mean intensity and temporal variation of disturbance on assemblages of rocky shores. Ecology 86(8): 2061-2067

Topic

Marine

Is peer reviewed

true