Attribute‐based classification of European hydrophytes and its relationship to habitat utilization

Freshwater Biology - Tập 43 Số 1 - Trang 43-74 - 2000
Nigel Willby1, Vicky J. Abernethy1, Benoît O. L. Demars1
1Division of Environmental and Evolutionary Biology, Institute of Biomedical and Life Sciences, Graham Kerr Building, University of Glasgow, Glasgow G12 8QQ, U.K.

Tóm tắt

SUMMARYHere we classify selected European hydrophytes into ‘attribute groups’ based on the possession of homogenous sets of characteristics, and explore the correspondence between these attribute groups, or individual attributes, and habitat use.Non‐hierarchical clustering was used to assign 120 species to twenty groups based on a matrix of categorical scores for literature‐ and field‐derived information covering seventeen intrinsic morphological and life‐history traits. Subdivision of some of these traits produced a total of 58 attributes (i.e. modalities). The robustness of this classification was confirmed by a high rate of reclassification (92%) under multiple discriminant analysis (MDA). The phylogenetic contribution was explored using ordination methods with taxonomy at family level acting as a covariable.Our approach differed from earlier classifications based on growth or life form because we regarded growth form plasticity as a property of the species and its range of growing conditions, rather than of each individual population, and we considered additional (e.g. regenerative) traits. However, some conventional life form groups were preserved (i.e. utricularids, isoetids, hydrocharids and lemnids).Some parallels existed with established theory on terrestrial plant growth strategies, but we used strictly intrinsic attributes relevant specifically to hydrophytes and our groups could not be decomposed into three or four primary strategies. Only finer levels of partitioning appear to be of fundamental and applied ecological relevance in hydrophytes.A principal components analysis ordination based on 26 attributes related to physical habitat utilization separated species and their attribute groups along axes relating to: (a) flow, substratum grade and organic matter content, scour frequency, and sedimentation; and (b) depth, water level stability and biotic disturbance. A MDA applied to species ordination scores indicated only a modest overall correspondence between attribute groups and habitat use (54% correct reclassification). Poor reclassification was the result of intergroup overlap (indicating alternative sets of attributes for a given habitat) or high intragroup variance in habitat utilization (indicating commonality of attributes between different habitats). These results are interpreted in terms of trade‐offs between resistance and resilience traits, ‘functional plasticity’ in traits, phylogenetic dependence in some groups and methodological constraints. The predictive potential of hydrophyte groups and their limitations are discussed.Redundancy analysis revealed a highly significant correlation between traits and habitat use (P< 0.01). Our attribute matrix explained 72% of variation in physical habitat use with eight attributes (i.e. turions, anchored emergent leaves, high or low body flexibility, high root:shoot biomass ratio, free‐floating surface or free‐floating submerged growth form, and annual life history) explaining half of this variation.Most attributes were mapped in accordance with habitat template predictions, although tests were confounded by the underlying correlation between spatial and temporal heterogeneity. The main features were: (a) a trade‐off between resistance‐type traits (related to stream lining, flexibility and anchorage) in more spatially heterogenous riverine and littoral zone habitats, and resilience type traits (i.e. turions, very small body size and free‐floating growth forms) in spatially simple, rarely disturbed habitats, such as backwaters and canals; and (b) a shift from high investment competitive traits with a low reproductive output in deep stable habitats to classically ruderal and desiccation resistance traits in shallow fluctuating habitats.

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Tài liệu tham khảo

AbernethyV.J.(1994)Functional ecology of euhydrophyte communities of European riverine wetland ecosystems.Ph.D. Thesis University of Glasgow Glasgow.

10.1007/BF00012758

10.1002/9781444313765

10.1007/978-94-009-3087-2_5

10.1127/archiv-hydrobiol/143/1998/21

10.1016/0304-3770(94)90078-7

10.1111/j.1365-2427.1994.tb01753.x

Botkin D.B., 1975, Ecosystem Analysis and Prediction, 98

10.2307/3236124

Bowes G., 1987, Plant Life in Aquatic and Amphibious Habitats, 79

10.1111/j.1365-2427.1994.tb01743.x

10.2307/2260194

10.2307/3236278

10.2307/3565673

10.1127/archiv-hydrobiol/142/1998/415

10.1111/j.1365-2427.1994.tb01742.x

10.2307/1217948

Cook C.D.K., 1990, Aquatic Plant Book

10.2307/1941260

10.1016/0304-3770(93)90010-T

Diaz S., 1997, Plant functional types and ecosytem function in relation to global change, Journal of Vegetation Science, 8, 463, 10.2307/3237198

Rietz G.E., 1931, Life‐forms of terrestrial flowering plants, Acta Phytogeographica Suecica, 3, 1

10.1016/0304-3770(91)90102-B

10.1016/0304-3770(86)90025-2

10.2307/3235589

10.2307/2261309

Friedel M.H., 1988, Range assessment and monitoring in arid lands:the derivation of functional groups to simplify data, Journal of Environmental Management, 27, 85

10.1017/CBO9780511623332

10.1038/334242a0

10.2307/3235623

Gordon A.D., 1981, Classification: Methods for the Exploratory Analysis of Multivariate Data

10.1016/0304-3770(93)90070-D

10.2307/3235716

10.1086/283244

Grime J.P., 1979, Plant Strategies and Vegetation Processes

10.1126/science.277.5330.1260

10.1111/j.1365-2311.2004.00572.x

10.1007/978-94-017-1094-7

Groenendael J.M., 1996, Comparative ecology of clonal plants, Philosophical Transactions of the Royal Society London, B, 351, 1331, 10.1098/rstb.1996.0116

10.1111/j.1438-8677.1964.tb00163.x

Hartog C., 1988, Structural aspects of aquatic plant communities, 113

10.2307/2261606

10.1007/BF00052812

Hill M.O., 1979, twinspan ‐ A fortran Program for Arranging Multivariate Data in an Ordered Two‐way Table by Classification of the Individuals and Attributes

Hogeweg P., 1969, Structure and aquatic vegetation in India, the Netherlands and Czechoslovakia, Tropical Ecology, 10, 139

10.1007/978-94-011-1494-3_4

10.1046/j.1365-2427.1998.00369.x

Hutchinson G.E., 1975, Limnological Botany

10.1017/CBO9780511525575

10.2307/3565672

10.1007/978-94-010-9011-7

10.2307/2389954

10.1007/BF00033257

Korner C., 1993, Biodiversity and Ecosystem Function, 117

Krzanowski W.J., 1988, A User's Perspective

10.2307/2531893

10.2307/2260687

10.1007/BF00120678

Lincoln R.J., 1982, A Dictionary of Ecology, Evolution and Systematics

10.1046/j.1365-2435.1998.00172.x

10.2307/2259587

10.2307/2390156

10.1016/0304-3770(92)90037-J

10.2307/3236176

10.1016/S0301-4797(05)80015-5

10.1111/j.1365-2427.1995.tb01156.x

Murphy K.J., 1994, Global Wetlands: Old World and New, 659

10.1016/0304-3770(90)90048-P

10.1007/BF00121013

Payne R.W., 1993, Genstat 5 Release 3 Reference Manual, 10.1093/oso/9780198523123.001.0001

10.2307/3546109

Preston C.D., 1995, Pondweeds of Great Britain and Ireland

Preston C.D., 1997, Aquatic Plants in Britain and Ireland

Raunkiaer, 1934, The Life Forms of Plants and Statistical Plant Geography

10.1046/j.1365-2427.1997.d01-540.x

10.1007/BF00008476

10.1111/j.1365-2427.1993.tb00774.x

Segal S., 1968, Planzensoziologische Systematik, 191

10.2307/2260637

10.2307/2260825

10.2307/2389561

10.2307/2389989

Smith T.M., 1997, IGBP Series

10.1007/978-1-4615-2816-6_14

10.2307/3817

10.2307/3565974

SpinkA.J.(1992)The ecological strategies of aquaticRanunculusspecies.Ph.D. Thesis University of Glasgow Glasgow.

Stace C., 1991, New Flora of the British Isles

10.1046/j.1365-2427.1997.00195.x

10.1111/j.1365-2427.1994.tb01739.x

10.1086/409052

10.2307/3545860

Braak C.J.F., 1998, Canoco Reference Manual and User's Guide to Canoco for Windows: Software for Canonical Community Ordination (Version 4)

Thompson K., 1997, The Soil Seed Banks of North Western Europe

10.1046/j.1365-2427.1997.00166.x

10.1111/j.1365-2427.1994.tb01740.x

Triest L., 1986, 7th International Symposium on Aquatic Weeds, 357

Tutin T.G., 1964, Flora Europeaea

Wade P.M., 1986, 7th International Symposium on Aquatic Weeds, 389

Wiegleb G., 1991, Die Lebens‐ und Wuchsformen der Makrophytischen Wasserpflanzen und deren Beziehungen zur Okologie, Verbreitung und Vergesellschaftung der Arten, Tuexenia, 11, 135

10.1016/0304-3770(91)90028-4

10.1007/BF00035389

10.1111/j.1654-1103.1996.tb00489.x

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Freshwater Biology

Tập 43 Số 1

43-74

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