Estimating trophic position in marine and estuarine food webs

Ecosphere - Tập 3 Số 3 - Trang 1-20 - 2012
W. Mather A. Carscallen1, Kristen Vandenberg1, Julia M. Lawson1, Neo D. Martinez2, Tamara N. Romanuk1
1Department of Biology, Dalhousie University, 1355 Oxford Street, Halifax, Nova Scotia B3H 4J1, Canada
2Pacific Ecoinformatics and Computational Ecology Lab, 1604 McGee Avenue, Berkeley, California 94703 USA

Tóm tắt

Structural or binary approaches, based on presence‐absence of feeding links, are the most common method of assembling food webs and form the basis of the most well explored food web models. Binary approaches to assembling feeding links are often criticized as being less powerful and accurate than flow‐based methods. To test this assumption we compared binary estimates of trophic position with estimates based on stable isotope values of nitrogen (δ15N). For 366 species from eight marine and estuarine food webs we compared trophic position estimates based on binary (presence‐absence) feeding links with estimates based on the stable isotope of nitrogen (δ15N). For a subset of 127 fish species in four of the webs we further compared trophic position estimates based on gut content analysis using a flow‐based algorithm using data from FishBase.org with binary and δ15N estimates. Across all species and webs binary estimates of trophic position were strongly correlated (R = 0.644) with δ15N estimates. On average binary estimates differed from baseline corrected δ15N estimates by 2.33% for mean trophic position and 6.57% for maximum trophic position. On average the difference between binary δ15N estimates was 0.14 of a trophic level. For the subset of 127 fish species binary estimates performed similarly or more accurately in predicting δ15N values than the flow‐based estimates. Binary approaches to assembling feeding links are often criticized as being less powerful and accurate than flow‐based methods. Our results show a high concordance between binary and δ15N estimates of trophic position as well as showing that in some cases binary estimates are better predictors of δ15N than flow‐based estimates, reaffirming the robustness of the structural approach to assembling food webs. Additional cross‐validation studies in other ecosystems are necessary to determine whether our results can be generalized to terrestrial and freshwater ecosystems.

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Tài liệu tham khảo

10.1111/j.0030-1299.2007.15768.x

10.1111/j.1600-0706.2009.17768.x

10.1577/1548-8659(2002)131<0337:PEOSIA>2.0.CO;2

10.2307/1943071

10.1016/S1569-4860(05)08022-8

10.1139/F09-196

10.1890/0012-9658(2006)87[2411:CBRINF]2.0.CO;2

10.1007/s12038-010-0015-5

10.1038/nature02327

10.1016/S0304-3800(99)00022-8

Cohen J. E, 1978, Food webs and niche space

10.1007/978-3-642-83784-5

10.1007/s10021-008-9171-y

10.1016/j.ecolmodel.2007.08.004

10.1016/0016-7037(81)90244-1

10.3354/meps273291

Dunne J. A, 2006, The network structure of food webs, Ecological networks: linking structure to dynamics in food webs, 27

Elton C, 1927, Animal ecology

10.1674/0003-0031(2006)156[1:UOSITT]2.0.CO;2

Froese R. andD.Pauly.2010.FishBase.http://www.fishbase.org

10.1139/f00-072

10.2307/4088430

10.2307/3546201

10.1046/j.0021-8790.2001.00552.x

10.1111/j.1095-8649.2008.01809.x

10.2307/281022

Kline T. C, 1998, Cross-validation of trophic level estimates from a mass-balance model of Prince William Sound using 15N/14N data, Proceedings of the International Symposium on Fishery Stock Assessment Models. Program Report No. 98-01, 693

10.2307/1940762

10.1890/0012-9658(2007)88[42:CSIRPF]2.0.CO;2

10.2307/1930126

10.3354/meps230001

Mace G. M, 1983, Vertebrate home range size and energetic requirements, The ecology of animal movement, 32

10.1034/j.1600-0706.2003.12098.x

10.1080/11956860.2000.11682580

10.1016/0016-7037(84)90204-7

10.1139/F08-180

Odum W. E, 1975, Mangrove forests and aquatic productivity: An introduction to land water interactions

10.1098/rstb.2004.1597

10.1126/science.279.5352.860

10.1890/0012-9658(2002)083[0703:USITET]2.0.CO;2

10.1111/j.1600-0633.2007.00289.x

10.1111/j.1365-2400.2004.00432.x

Romanuk T. N, 2010, Trophic level scales positively with body size in fishes, Global Ecology and Biogeography

10.1890/07-0121.1

10.1139/F09-151

10.1016/j.soilbio.2004.04.033

10.1111/j.1600-0706.2009.17073.x

10.1139/F08-125

10.1890/05-1454

10.1139/f97-016

10.1038/46762

10.1890/0012-9658(1999)080[1395:PCCANA]2.0.CO;2

10.4319/lo.2001.46.8.2061

10.1890/07-0978.1

10.1038/35004572

10.1086/381964

10.1111/j.1461-0248.2010.01508.x

10.1046/j.1365-2656.1998.00224.x

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Ecosphere

Tập 3 Số 3

1-20

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