ZIB

Hits per page

hits 1 - 2 | 2 hits

Sorting

Electronic Resource

Describing benthic impacts of fish farming with fuzzy sets: theoretical background and analytic methods (1998)

Angel, D. L. ; Krost, P. ; Silvert, W. L.

Oxford, UK : Blackwell Publishing Ltd

Journal of applied ichthyology 14 (1998), S. 0

add to mindlist on the mindlist

Details

ISSN: 1439-0426

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Diver observations have been recorded over a period of several years at a site severely impacted by finfish niariculture. The logged data were analysed using fuzzy logic in order to address the problem of interpreting sometimes qualitative and subjective information. The underlying methodology based on fuzzy set theory is developed and described in this paper, along with the techniques used to quantify the relationship between the information recorded by the divers, which was usually of a verbal descriptive nature, and a numerical index of benthic impact. Fuzzy logic proved to be a valuable tool for translating the dive log data into quantitative form.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1439-0426.1998.tb00606.x

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Catalase activity in macro- and microorganisms as an indicator of biotic stress in coastal waters of the eastern Mediterranean Sea (1999)

Angel, D. L. ; Fiedler, U. ; Eden, N. ; [et al.]

Springer

Helgoland marine research 53 (1999), S. 209-218

add to mindlist on the mindlist

Details

ISSN: 1438-3888

Keywords: Key words Catalase activity ; Superoxide dismutase ; Biotic stress ; Donax trunculus ; Eastern Mediterranean Sea

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract In this study we examined the activity of catalase in the water column (mainly attributed to planktonic microorganisms) and the activity of catalase and superoxide dismutase (SOD), as well as lipid peroxidation in the midgut gland of the benthic bivalve Donax trunculus as possible indicators of biotic stress. The measurements were performed at stations situated at known contaminated and clean sites in the coastal waters and shores along the Israeli coast (eastern Mediterranean Sea). In the water column, we found that catalase activity was higher in polluted coastal waters than in nearby unpolluted or less-polluted stations. Moreover, there was diurnal periodicity in catalase activity rates which matched the diurnal changes in hydrogen peroxide levels in seawater. Consistent evidence of extracellular catalase activity was found in the seawater sampled. Catalase activity rates in the midgut gland of D. trunculus did not exhibit clear patterns with respect to site (polluted or clean) or season. However, SOD activity and lipid peroxidation measured in the same tissues were good indicators of organic pollution in the coastal waters examined and, among the three stations examined in Haifa Bay, Qiriat Haim was the most polluted.