Marine Biology

, Volume 124, Issue 3, pp 341–353 | Cite as

Comparative feeding ecology of two sympatric rockfish congeners, Sebastes caurinus (copper rockfish) and S. maliger (quillback rockfish)

  • D. J. Murie
Article

Abstract

Feeding ecology was compared between sympatrie populations of Sebastes congeners, S. caurinus (copper rockfish) and S. maliger (quillback rockfish), to determine the potential for interspecific competition for food resources. A total of 602 copper rockfish and 285 quillback rockfish were collected from rocky reefs in Saanich Inlet, British Columbia, Canada, from October 1986 to August 1990. All fish were collected in 15 to 40 m depth, where the species are sympatric. Seasonal and size-related differences in diet composition, niche breaidth and overlap of diets, diel variation in feeding, and quantity of food consumed were analysed to construct ecological profiles of the species. Overall, these two species had similar diets composed of pelagic and demersal fishes and crustaceans; both species consumed primarily demersal crustaceans throughout the year. Copper rockfish, however, consumed a greater proportion of pelagic fishes than quillback rockfish. Quillback rockfish had a greater proportion of pelagic crustaceans in their diet, especially during the spring and summer. The importance of fish in the diets of both species also increased with size. Copper and quillback rock fish consumed the greatest mass of food during the winter when feeding on juvenile herring (>90% of the mass of their diets). Copper rockfish also consumed a greater quantity of food than quillback rockfish during the winter. This winter feeding may be significant in the timing of the reproductive cycle in these rockfish. Values for niche overlap in food habits based on the mass of food resources consumed by copper and quillback rockfish were relatively high (>0.55) throughout the year, and in particular during the winter (0.99). Extensive niche overlap in the winter, however, occurred when niche breadths based on mass contribution were narrow. This was coincident with the presence of large schools of juvenile herring, and it was therefore assumed that herring were not a limited resource. Maximum niche overlap was therefore correlated with an abundance of a shared resource and hence did not indicate the presence of interspecific competition between copper and quillback rockfish.

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References

  1. Brodeur RD, Pearcy WG (1984) Food habits and dietary overlap of some shelf rockfishes (genus Sebastes) from the northeastern Pacific Ocean. Fish Bull US 82: 269–293Google Scholar
  2. Buckley RM, Hueckel GJ (1985) Biological processes and ecological development on an artificial reef in Puget Sound, Washington. Bull mar Sci 37: 50–69Google Scholar
  3. Butler TH (1980) Shrimps of the Pacific coast of Canada. Can Bull Fish aquat Sciences 202: 1–280Google Scholar
  4. Chen L-C (1971) Systematics, variation, distribution, and biology of rockfish of the subgenus Sebastomus (Pisces, Scorpaenidae, Sebastes). Bull Scripps Inst Oceanogr 18: 1–107Google Scholar
  5. Colwell RK, Futuyma DJ (1971) On the measurement of niche breadth and overlap. Ecology 52: 567–576Google Scholar
  6. Cummunis KW, Wuycheck JC (1971) Caloric equivalents for investigations in ecological energetics. Communs int Ass theor appl Limnol 18: 1–158Google Scholar
  7. Dixon WJ, Brown MB, Engelman L, Frane JW, Hill MA, Jennrich RI, Toporek JD (eds) (1983) BMDP statistical software. University of California Press, BerkeleyGoogle Scholar
  8. Fänge R, Grove D (1979) Digestion. In: Hoar WS, Randall DJ, Brett JR (eds) Fish physiology. Vol. VIII. Bioenergetics and growth. Academic Press, New York, pp 161–260Google Scholar
  9. Gotshall DW, Smith JG, Holbert AH (1965) Food of the blue rockfish, Sebastes mystinus. Calif Fish Game 51: 147–162Google Scholar
  10. Hand CM, Richards LJ (1991) Inshore rockfish (quillback, copper and yelloweye rockfish). In: Fargo J, Leaman BM (eds) Groundfish stock assessments for the west coast of Canada in 1990 and recommended yield options for 1991. Department of Fisheries and Oceans, Nanaimo, BC, pp 277–302 (Can tech Rep Fish aquat Sciences 1778)Google Scholar
  11. Hart JFL (1982) Crabs and their relatives of British Columbia. Handbk Br Columb prov Mus 40: 1–266Google Scholar
  12. Hart JL (1973) Pacific fishes of Canada. Bull Fish Res Bd Can 180: 1–740Google Scholar
  13. Horn HS (1966) Measurement of “overlap” in comparative ecological studies. Am Nat 100: 419–424Google Scholar
  14. Hueckel GJ, Stayton RL (1982) Fish foraging on an artificial reef in Puget Sound, Washington. Mar Fish Rev 44: 38–44Google Scholar
  15. Hurlbert SH (1978) The measurment of niche overlap and some relatives. Ecology 59: 67–77Google Scholar
  16. Hyslop EJ (1980) Stomach content analysis—a review of methods and their application J Fish Biol 17: 411–429Google Scholar
  17. Kathman RD, Austin WC, Saltman JC, Fulton J D (1986) Identification manual to the Mysidacea and Euphausiacea of the Northeast Pacific. Can Spec Publ Fish aquat Sciences 93: 1–411Google Scholar
  18. Keast A (1970) Food specializations and bioenergetic interrelations in the fish faunas of some small Ontario waterways. In: Steele JH (ed) Marine food chains. University of California Press, Berkeley, pp 377–411Google Scholar
  19. Kleinbaum DG, Kupper LL (1978) Applied regression analysis and other multivariate methods. Duxbury Press, North Scituate, MassachusettsGoogle Scholar
  20. Kozloff EN (1987) Marine invertebrates of the Pacific Northwest. University of Washington Press, SeattleGoogle Scholar
  21. Krebs CJ (1989) Ecological methodology. Harper & Row New YorkGoogle Scholar
  22. Larsen WA, McCleary SJ (1972) The use of partial residual plots in regression analysis. Technometrics 10: 1–11Google Scholar
  23. Larson RJ (1980) Copetition, habitat selection, and the bathymetric segregation of two rockfish (Sebastes) species. Ecol Monogr 50: 221–239Google Scholar
  24. Levins R (1968) Evolution in changing environments. Princeton University Press, Princeton, New JerseyGoogle Scholar
  25. Love MS, Morris P, McCrae M, Collins R (1990) Life history aspects of 19 rockfish species (Scorpaenidae: Sebastes) from the Southern California Bight. NOAA natn mar Fish Serv tech Rep US Dep Commerce 87: 1–38Google Scholar
  26. Mackie GO, Mills C E (1983) Use of the Pisces IV submersible for zooplankton studies in coastal waters of British Columbia. Can J Fish aquat Sciences 40: 763–776Google Scholar
  27. Morrow JE (1979) Preliminary keys to otoliths of some adult fishes of the Gulf of Alaska, Bering Sea, and Beaufort Sea. NOAA natn mar Fish Serv tech Rep Circ 420: 1–32Google Scholar
  28. Moulton LL (1977) An ecological analysis of fishes inhabiting the rocky nearshore regions of northern Puget Sound, Washington. Ph.D. dissertation. University of Washington, SeattleGoogle Scholar
  29. Murie DJ (1991) Comparative ecology and interspecific competition between the sympatric congeners Sebastes caurinus (copper rockfish) and S. maliger (quillback rockfish). Ph.D. dissertation. University of Victoria, Victoria, British ColumbiaGoogle Scholar
  30. Murie DJ (1994) Comparative allometric growth of the gastrointestinal tract of two sympatric congeners, copper rockfish (Sebastes caurinus) and quillback rockfish (S. maliger). J Fish Biol 44: 597–605Google Scholar
  31. Murie DJ, Parkyn DC, Clapp BG, Krause GG (1994) Observations on the distribution and activities of rockfish, Sebastes spp., in Saanich Inlet, British Columbia, from the Pisces IV submersible. Fish Bull US 92: 313–323Google Scholar
  32. Nikolsky GV (1963) The ecology of fishes. Academic Press, New YorkGoogle Scholar
  33. Patten BG (1973) Biological information on copper rockfish in Puget Sound, Washington. Trans Am Fish Soc 102: 412–416Google Scholar
  34. Pianka ER (1981) Competition and niche theory. In: Mey RM (ed) Theoretical ecology. Smauer Associates, Sunderland, Massachusetts, pp 167–196Google Scholar
  35. Prince ED, Gotshall DW (1976) Food of the copper rockfish, Sebastes caurinus Richardson, associated with an artificial reef in south Humboldt Bay, California. Calif Fish Game 62: 274–285Google Scholar
  36. Reilly CA, Wyllie Echeverria T, Ralston S (1992) Interannual variation and overlap in the diets of pelagic juvenile rockfish (genus: Sebastes) off central California. Fish Bull US 90: 505–515Google Scholar
  37. Richards LJ (1987) Copper rockfish (Sebastes caurinus) and quillback rockfish (Sebastes maliger) habitat in the Strait of Georgia, British Columbia Can J Zool 65: 3188–3191Google Scholar
  38. Richards LJ, Cass AJ (1987) The British Columbia inshore rockfish fishery: stock assessment and fleet dynamics of an unrestricted fishery. Alaska Sea Grant Rep (Univ Alaska, Fairbanks) 87-2: 299–308 (Proceedings of the International Rockfish Symposium, October 1986, Anchorage, Alaska)Google Scholar
  39. Rosenthal RJ, Moran-O'Connell V, Murphy MC (1988) Feeding ecology of ten species of rockfishes (Scorpaenidae) from the Gulf of Alaska. Calif Fish Game 74: 16–37Google Scholar
  40. Schoener TW (1974) Resource partitioning in ecological communities. Science, NY 185: 27–39Google Scholar
  41. Singer MM (1985) Food habits of juvenile rockfishes (Sebastes) in a central California kelp forest. Fish Bull US 83: 531–541Google Scholar
  42. Tabachnick BG, Fidoll LS (1983) Using multivariate statistics. Harper & Row, New YorkGoogle Scholar
  43. Tyler AV (1973) Caloric values of some North Atlantic invertebrates. Mar Biol 19: 258–261Google Scholar
  44. Zar JH (1984) Biostatistical analysis. 2nd edn. Prentice-Hall, Inc., Englewood Cliffs, New JerseyGoogle Scholar

Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • D. J. Murie
    • 1
  1. 1.Department of BiologyUniversity of VictoriaVictoriaCanada

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