Genre
- Journal Article
Given the logistical difficulties, cost, and time involved in species-level identifications, several authors have proposed the use of coarser taxonomic resolution (e.g. family, order) in studies of pollution. The use of surrogates instead of species relies on their sufficiency to detect community responses to the pollution gradient without appreciable loss of information. No studies, however, have applied this approach to experimental studies such as community responses to predation disturbance and evaluated the performance of surrogates at the spatial scales typical of experiments. We addressed both problems by analyzing the results of three predation experiments carried out in Bonne Bay, Newfoundland. We pooled species data into coarser taxonomic categories (family to class) and determined whether effects of predation that were evident at the species level were also evident with the use of each coarser surrogate and increasing data transformation. Our results indicate that non-transformed data at the family level represent a reasonable surrogate of species; however, the ability to discriminate between ambient and (predator) manipulated sediments is gradually lost with data transformation and with the pooling of species into coarser taxonomic categories. Successive data transformation indicates that in this system predation plays a strong role oil dominant but not necessarily rare species. Moreover, our results suggest that varying reliability of surrogates precludes the identification of a single general level of taxonomic sufficiency to be used in experimental studies. The use of surrogates, therefore, is suggested only after scrutiny and evaluation, and should be limited to preliminary studies where biodiversity has been well described. (C) 2006 Elsevier B.V. All rights reserved.
Mem Univ Newfoundland, Ctr Ocean Sci, St John, NF A1C 5S7, Canada. Mem Univ Newfoundland, Dept Biol, St John, NF A1C 5S7, Canada.; Quijon, PA, Univ Prince Edward Isl, Dept Biol, 550 Univ Ave, Charlottetown, PE C1A 4P3, Canada.; pquijon@upei.ca
AMSTERDAM; PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
ELSEVIER SCIENCE BV
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Source type: Electronic(1)
Language
- English
Subjects
- pollution
- BIODIVERSITY
- MESOCOSM EXPERIMENT
- SUFFICIENCY
- Marine & Freshwater Biology
- ATTRIBUTES
- MACROBENTHIC COMMUNITY
- sedimentary benthos
- TRANSFORMATIONS
- ASSEMBLAGES
- MACROFAUNA
- FRIERFJORD-LANGESUNDFJORD
- field experiments
- ecology
- taxonomic resolution
- DATA