Environmental Biology of Fishes

, Volume 95, Issue 1, pp 3–20

Breaking with tradition: redefining measures for diet description with a case study of the Aleutian skate Bathyraja aleutica (Gilbert 1896)

  • Simon C. Brown
  • Joseph J. Bizzarro
  • Gregor M. Cailliet
  • David A. Ebert
Article

Abstract

Characterization of fish diets from stomach content analysis commonly involves the calculation of multiple relative measures of prey quantity (%N,%W,%FO), and their combination in the standardized Index of Relative Importance (%IRI). Examining the underlying structure of dietary data matrices reveals interdependencies among diet measures, and obviates the advantageous use of underused prey-specific measures to diet characterization. With these interdependencies clearly realized as formal mathematical expressions, we proceed to isolate algebraically, the inherent bias in %IRI, and provide a correction for it by substituting traditional measures with prey-specific measures. The resultant new index, the Prey-Specific Index of Relative Importance (%PSIRI), is introduced and recommended to replace %IRI for its demonstrated more balanced treatment of the relative measures of prey quantity, and less erroneous behavior across taxonomic levels of identified prey. As a case study, %PSIRI was used to examine the diet of the Aleutian skate Bathyraja aleutica from specimens collected from three ecoregions of the northern Gulf of Alaska (GOA) continental shelf during June-September 2005–2007. Aleutian skate were found to primarily consume the commonly abundant benthic crustaceans, northern pink shrimp Pandalus eous and Tanner crab Chionoecetes bairdi, and secondarily consume various teleost fishes. Multivariate variance partitioning by Redundancy Analysis revealed spatially driven differences in the diet to be as influential as skate size, sex, and depth of capture. Euphausiids and other mid-water prey in the diet were strongly associated with the Shelikof Strait region during 2007 that may be explained by atypical marine climate conditions during that year.

Keywords

Skate Bathyraja aleutica Diet Gulf of Alaska Food habits Index of relative importance 

References

  1. Ainsworth CH, Kaplan IC, Levin PS, Mangel M (2010) A statistical approach for estimating fish diet compositions from multiple data sources: Gulf of California case study. Ecol Appl 20:2188–2202PubMedCrossRefGoogle Scholar
  2. Amundsen PA, Gabler HM, Staldvik FJ (1996) A new approach to graphical analysis of feeding strategy from stomach contents data—modification of the Costello (1990) method. J Fish Biol 48:607–614Google Scholar
  3. Anderson MJ (2006) Distance-based tests for homogeneity of multivariate dispersions. Biometrics 62:245–253PubMedCrossRefGoogle Scholar
  4. Anderson PJ, Piatt JF (1999) Community reorganization in the Gulf of Alaska following ocean climate regime shift. Mar Ecol Prog Ser 189:117–123CrossRefGoogle Scholar
  5. Antonenko D, Pushchina O, Solomatov S (2007) Distribution and some biological features of skate Bathyraja parmifera (Rajidae, Rajiformes) in the northwestern part of the Sea of Japan. J Ichthyol 47:279–287CrossRefGoogle Scholar
  6. Assis C (1996) A generalised index for stomach contents analysis in fish. Sci Mar 60:385–389Google Scholar
  7. Barbini SA, Scenna LB, Figueroa DE, Cousseau MB, de Astarloa JMD (2010) Feeding habits of the Magellan skate: effects of sex, maturity stage, and body size on diet. Hydrobiologia 641:275–286CrossRefGoogle Scholar
  8. Berestovskiy EG (1989) Feeding in the skates, Raja radiata and Raja fyllae, in the Barents and Norwegian Seas. Voprosy Ikhtiologii 29:994–1002Google Scholar
  9. Bizzarro JJ, Smith WD, Márquez-FarÌas JF, Tyminski J, Hueter RE (2009) Temporal variation in the artisanal elasmobranch fishery of Sonora, Mexico. Fish Res 97:103–117CrossRefGoogle Scholar
  10. Borcard D, Legendre P, Drapeau P (1992) Partialling out the spatial component of ecological variation. Ecology 73:1045–1055CrossRefGoogle Scholar
  11. Brickle P, Laptikhovsky V, Pompert J, Bishop A (2003) Ontogenetic changes in the feeding habits and dietary overlap between three abundant rajid species on the Falkland Islands’ shelf. J Mar Biol Assoc UK 83:1119–1125CrossRefGoogle Scholar
  12. Cortès E (1997) A critical review of methods of studying fish feeding based on analysis of stomach contents: application to elasmobranch fishes. Can J Fish Aquat Sci 54:726–738Google Scholar
  13. Cortès E (1998) Methods of studying fish feeding: reply. Can J Fish Aquat Sci 55:2708CrossRefGoogle Scholar
  14. Costello MJ (1990) Predator feeding strategy and prey importance: a new graphical analysis. J Fish Biol 36:261–263CrossRefGoogle Scholar
  15. de Crespin de Billy V, Doledec S, Chessel D (2000) Biplot presentation of diet composition data: an alternative for fish stomach contents analysis. J Fish Biol 56:961–973Google Scholar
  16. Ebert DA, Bizzarro JJ (2007) Standardized diet compositions and trophic levels of skates (Chondrichthyes: Rajiformes: Rajoidei). Environ Biol Fishes 80:221–237CrossRefGoogle Scholar
  17. Ferry LA, Cailliet GM (1996) Sample size and data analysis: are we characterizing and comparing diet properly? Gut Shop, American Fisheries SocietyGoogle Scholar
  18. Hansson S (1998) Methods of studying fish feeding: a comment. Can J Fish Aquat Sci 55:2706–2707CrossRefGoogle Scholar
  19. Hoff GR (2002) New records of the Aleutian Skate, Bathyraja aleutica from Northern California. California Fish Game 88:145–148Google Scholar
  20. Hyslop EJ (1980) Stomach contents analysis—a review of methods and their application. J Fish Biol 17:411–429CrossRefGoogle Scholar
  21. Legendre P, Legendre L (1998) Numerical ecology. ElsevierGoogle Scholar
  22. Legendre P, Gallagher E (2001) Ecologically meaningful transformations for ordination of species data. Oecologia 129:271–280CrossRefGoogle Scholar
  23. Link JS, Sosebee K (2008) Estimates and implications of skate consumption in the Northeast U.S. continental shelf ecosystem. N Am J Fish Manag 28:649–662CrossRefGoogle Scholar
  24. Mecklenburg C, Mecklenburg T, Thorsteinson L (2002) Fishes of Alaska. American Fisheries Society, Bethesda, p 1037Google Scholar
  25. Oksanen J, Blanchet F, Kindt R, Legendre P, O’Hara R, Simpson G, Solymos P, Henry M, Stevens M, Wagner H (2011) Vegan: community ecology package. R package version 1.17-6. http://CRAN.R-project.org/package=vegan
  26. Orloci L (1978) Multivariate analysis in vegetation research. Dr. W. Junk B.V, The HagueGoogle Scholar
  27. Orlov AM (1998) The diets and feeding habits of some deep-water benthic skates (Rajidae) in the Pacific Waters Off the Northern Kuril Islands and Southeastern Kamchatka. Alaska Fish Res Bull 5:1–17Google Scholar
  28. Ormseth OA, Matta B (2009) Assessment of the skate complex in the Gulf of Alaska SAFE Report, North Pacific Fisheries Management CouncilGoogle Scholar
  29. Ortaz M, Von Bach PB, Candia R (2006) The diet of the neotropical insectivorous fish Creagrutus bolivari (Pisces: Characidae) according to the “graphic” and “relative importance” methods. Rev Biol Trop 54:1227–1239PubMedGoogle Scholar
  30. Piatt JF, Springer AM (2007) Marine ecoregions of Alaska. In: Spies R (ed) Long-term ecological change in the Northern Gulf of Alaska. Elsevier, Amsterdam, pp 522–526Google Scholar
  31. Rinewalt CS, Ebert DA, Cailliet GM (2007) Food habits of the sandpaper skate, Bathyraja kincaidii (Garman, 1908) off central California: seasonal variation in diet linked to oceanographic conditions. Environ Biol Fishes 80:147–163CrossRefGoogle Scholar
  32. Robinson HJ, Cailliet GM, Ebert DA (2007) Food habits of the longnose skate, Raja rhina (Jordan and Gilbert, 1880), in central California waters. Environ Biol Fishes 80:165–179CrossRefGoogle Scholar
  33. Stevens JD, Bonfil R, Dulvy NK, Walker PA (2000) The effects of fishing on sharks, rays, and chimaeras (chondrichthyans), and the implications for marine ecosystems. ICES J Mar Sci 57:476–494CrossRefGoogle Scholar
  34. Stevenson DE, Orr JW, Hoff GR, McEachran JD (2007) Emerging patterns of species richness, diversity, population density, and distribution in the skates (Rajidae) of Alaska. Fish Bull 106:24–39Google Scholar
  35. ter Braak CJ, Smilauer P (2002) CANOCO reference manual and CanoDraw for windows user’s guide: software for canonical community ordination (version 4.5). Microcomputer Power, IthicaGoogle Scholar
  36. Wearmouth VJ, Sims DW (2009) Movement and behaviour patterns of the critically endangered common skate Dipturus batis revealed by electronic tagging. J Exp Mar Biol Ecol 380:77–87CrossRefGoogle Scholar
  37. Weingartner T (2005) Chapter 4 physical and geological oceanography: coastal boundaries and coastal and ocean circulation. In: Mundy PR (ed) The Gulf of Alaska: biology and oceanography, Alaska sea grant college program. University of Alaska, FairbanksGoogle Scholar
  38. Yang M-S (2007) Food habits and diet overlap of seven skate species in the Aleutian Islands. In: Commer USD (ed) NOAA Tech. Memo, p 46Google Scholar
  39. Yang M-S, Dodd K, Hibpshman R, Whitehouse A (2006) Food habits of groundfishes in the Gulf of Alaska in 1999 and 2001. In: Commer USD (ed) NOAA Tech. Memo, p 199Google Scholar

Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Simon C. Brown
    • 1
  • Joseph J. Bizzarro
    • 1
    • 2
  • Gregor M. Cailliet
    • 1
  • David A. Ebert
    • 1
  1. 1.Pacific Shark Research Center, Moss Landing Marine LaboratoriesMoss LandingUSA
  2. 2.School of Aquatic and Fishery SciencesUniversity of WashingtonSeattleUSA

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