Title: Trophic level-based indicators to track fishing impacts across marine ecosystems
Authors: SHANNON Lynne J.COLL MartaBUNDY AlidaGASCUEL DidierHEYMANS Johanna J.KLEISNER KristinLYNAM ChristopherPIRODDI CHIARATAM JorgeTRAVERS-TROLET MorganeSHIN Yunne-Jai
Citation: MARINE ECOLOGY-PROGRESS SERIES vol. 512 p. 115-140
Publisher: INTER-RESEARCH
Publication Year: 2014
JRC N°: JRC85625
ISSN: 0171-8630
URI: http://www.int-res.com/abstracts/meps/v512/p115-140/
http://publications.jrc.ec.europa.eu/repository/handle/JRC85625
DOI: 10.3354/meps10821
Type: Articles in periodicals and books
Abstract: Trophic level (TL)-based indicators have been widely used to examine fishing impacts in aquatic ecosystems and the induced biodiversity changes. However, much debate has ensued regarding discrepancies and challenges arising from the use of landings data from commercial fisheries to calculate TL indicators. Subsequent studies have started to examine survey-based and model-based indicators. In this paper, we undertake an extensive evaluation of a variety of TL indicators across 9 well-studied marine ecosystems by making use of model- as well as survey and catch-based TL indicators. Using detailed regional information and data on fishing history, fishing intensity, and environmental conditions, we evaluate how well TL indicators are capturing fishing effects at the community level of marine ecosystems. Our results highlight that the differences observed between TL indicator values and trends is dependent on the data source and the TL cut-off point used in the calculations and is not attributable to an intrinsic problem with TL based indicators. All 3 data sources provide useful information about the structural changes in the ecosystem as a result of fishing, but our results indicate that only model-based indicators represent fishing impacts at the whole ecosystem level.
JRC Directorate:Sustainable Resources

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