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Trait-based Analyses for Fishes and Invertebrates in Streams

Trait-based Analyses for Fishes and Invertebrates in Streams. Stoeckerecological.com. Mark Pyron. River Habitat T emplet. Ideas for species traits-environmental filters (from Southwood 1977; used by Poff 1997). Why Traits?. Compare evolutionarily distinct systems

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Trait-based Analyses for Fishes and Invertebrates in Streams

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  1. Trait-based Analyses forFishes and Invertebrates in Streams Stoeckerecological.com Mark Pyron

  2. River Habitat Templet Ideas for species traits-environmental filters (from Southwood1977; used by Poff 1997)

  3. Why Traits? Compare evolutionarily distinct systems Species-habitat relationships Ecosystem processes

  4. Major assumption! Present day habitat conditions match present day traits in organisms

  5. Which traits? Which analyses? What are results? What are problems?

  6. Which traits? • Spatial and temporal heterogeneity of habitat define where and when the organisms use habitat

  7. Traits: • Should vary with ecological gradients

  8. and . . . • Organisms with same traits occur in multiple biogeographical regions • Different taxa

  9. Traits of macroinvertebrates • Trophic • Shredders, filterer-collector, grazer, predator • Locomotion • Body size • Voltinism • Respiration technique

  10. Traits of macroinvertebrates • Life history: reproductive strategies • Body size • Egg size, number, shape, attachment • Generations / year • Oviposition period -season • Incubation time • Clutch number

  11. Traits of fishes • Habitat preferences: • Stream size (small, medium, large) • Discharge • Temperature • Depth • Substrate size • Canopy

  12. Traits of fishes • Life history • Body size • Lifespan • Age at maturity • Egg size • Fecundity

  13. Traits of fishes • Dispersal ability • Colonization ability

  14. Traits of fishes • Reproductive guilds • IBI metrics • Feeding and ecosystem interactions • Morphology

  15. Analyses – patterns Heino et al. 2013

  16. Analyses – patterns Heino et al. 2013 • Across catchment • RCC predictions • Do organisms respond same to environmental gradient?

  17. Analyses – patterns Heino et al. 2013 • Across catchment • Among region differences or convergence • Same traits in different local communities? • Compare trait responses to same gradients in different geographical regions

  18. Analyses – patterns Heino et al. 2013 • Across catchment • Among region differences or convergence • Across community – large extent or w/in catchment • Trait variation across local communities in drainage basin at large geographical extent

  19. Analyses – testsHeino et al. 2013 Indirect ordination: CA, PCA Direct ordination: CCA, RDA, RLQ Group test: MRPP Life history strategy: ANOVA Niche Model: Maximum Entropy Trait diversity: regression, ANOVA

  20. Results: macroinvertebrate traits • Human impacts • Traits discriminate river reaches • Taxonomy could not • Genus level or family level sufficient • Gayraud et al. 2003

  21. Results: macroinvertebrate trait richness • Increases along local, catchment, and geographical gradients • Bêche& Statzner2009

  22. Results: macroinvertebrate traits studies • Trait richness correlated with genus richness Beche & Statzner 2009

  23. Results: fish traits • Hydrologic variability: • Resource generalists vs. specialists • Poff& Allan 1995

  24. Results: fish traits • Hydrologic variability: • Life-history traits • Tedesco et al. 2008; Mims & Olden 2012

  25. Results: fish traits studies • Taxonomy explains regional / geographic distributions of fishes • Traits better explain local habitat type and stability, and regional distribution • Hoeinghaus et al. 2006

  26. Results: fish traits studies • Difference in fish traits across river basins • Result of glaciation: filter • Colonizers had opportunistic traits: small body size, brief lifespan, low age maturity, small eggs • Mims et al. 2010 • Jacquemin and Pyron 2011

  27. Traits vs. taxa • respond similarly to gradients? • Predicted by Heino et al. 2013: • Traits insensitive to geographical variation • Taxa more geographically structured • Depends on spatial extent of study

  28. Problems with traits • Developmental trophic changes • Poorly known taxa; broad family characterizations often incorrect • Traits are intercorrelated: not independent

  29. Problems with traits • Data quality of traits varies • Fuzzy coding, continuous variables, categories

  30. Summary • Functional traits are useful • Tend to respond more strongly to environmental gradients than taxonomy • Taxonomy is successful at distinguishing large-scale assemblage variation

  31. Traits studies • Gayraud et al. 2003 • Goldstein & Meador 2005 • Hoeinghaus et al. 2007 • Frimpong & Angermeier2010 • Menezes et al. 2010 • Pyron et al. 2011 • Jacquemin & Pyron 2011 • Pease et al. 2012 • Heino et al. 2013

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