Summary
The effects of predation by the chaetognath Sagitta hispida and nutrient enrichment on estuarine copepod community structure were studied by experimental manipulations in large enclosures. Chaetognath abundance and nutrient addition rates were manipulated in a factorial design. Predation by chaetognaths resulted in a significant decline in the relative abundance of Acartia tonsa and an increase in the relative abundance of Oithona colcarva. However, these effects were evident only at chaetognath densities far higher than observed in natural populations. Nutrient enrichment resulted in a decline in relative abundance of Paracalanus crassirostris, and, in the absence of chaetognath predation, an apparent increase in the relative abundance of A. tonsa. The effects of chaetognath predation were independent of enrichment level, apparently because of the absence of effects of enrichment on total copepod and chaetognath densities.
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References
Armstrong RA (1979) Prey species replacement along a gradient of nutrient enrichment: A graphical approach. Ecology 60:76–84
Barica J, Kling H, Gibson J (1980) Experimental manipulation of algal bloom composition by nitrogen addition. Can J Fish Aquat Sci 37:1175–1183
Connell JH (1961) The influence of interspecific competition and other factors on the distribution of the barnacle Chthamalus stellatus. Ecology 42:710–723
Connell JH (1975) Some mechanisms producing structure in natural communities: A model and evidence from field experiments. In: Cody ML, Diamond JM (eds) Ecology and Evolution of Communities. Belknap Press, Cambridge, pp 460–490
Dayton PK (1971) Competition, disturbance, and community organization: The provision and subsequent utilization of space in a rocky intertidal community. Ecol Monogr 41:351–389
Dhondt AA, Eyckerman R (1980) Competition between the Great Tit and the Blue Tit outside the breeding season in field experiments. Ecology 61:1291–1296
Feigenbaum D, Reeve MR (1977) Prey detection in the Chaetognatha: Response to a vibrating probe and experimental determination of attack distance in large aquaria. Limnol Oceanogr 22:1052–1058
Fulton RS III (In press a) Distribution and community structure of estuarine copepods. Estuaries
Fulton RS III (In press b) Predation, production, and the organization of an estuarine copepod community. J Plankton Res
Gerritsen J, Strickler JR (1977) Encounter probabilities and community structure in zooplankton: A mathematical model. J Fish Res Bd Can 34:73–82
Grace JB, Wetzel RG (1981) Habitat partitioning and competitive displacement in cattails (Typha): Experimental field studies. Am Nat 118:463–474
Grice GD, Harris RP, Reeve MR, Heinbokel JF, Davis CO (1980) An overview of Foodweb I, the final CEPEX experiment. J Mar Biol Ass UK 60:401–414
Hall DJ, Cooper W, Werner E (1970) An experimental approach to the production dynamics and structure of freshwater animal communities. Limnol Oceanogr 15:839–928
Holmes RT, Schultz JC, Nothnagle P (1979) Bird predation on forest insects: An exclosure experiment. Science 296:462–463
Inouye RS, Byres GS, Brown JH (1980) Effects of predation and competition on survivorship, fecundity and community structure of desert annuals. Ecology 61:1344–1351
Ivlev VS (1961) Experimental Ecology of the Feeding of Fishes. Yale Univ Press, New Haven
Kirchner TB (1977) The effects of resource enrichment on the diversity of plants and arthropods in a shortgrass prairie. Ecology 58:1334–1344
Lampitt RS (1978) Carnivorous feeding by a small marine copepod. Limnol Oceanogr 23:1228–1231
Lynch M (1978) Complex interactions between natural coexploiters — Daphnia and Ceriodaphnia. Ecology 59:552–564
Lynch M (1979) Predation, competition, and zooplankton community structure: An experimental study. Limnol Oceanogr 24:253–272
Lynch M, Shapiro J (1981) Predation, enrichment, and phytoplankton community structure. Limnol Oceanogr 26:86–102
Menge BA (1972) Competition for food between two intertidal starfish species and its effect on body size and feeding. Ecology 53:635–644
Menge BA, Sutherland JP (1976) Species diversity gradients: Synthesis of the roles of predation, competition, and temporal heterogeneity. Am Nat 110:351–369
Morin PJ (1981) Predatory salamanders reverse the outcome of competition among three species of anuran tadpoles. Science 212:1284–1286
Neill WE, Peacock A (1980) Breaking the bottleneck: Interactions of invertebrate predators and nutrients in oligotrophic lakes. In: Kerfoot WC (ed) Evolution and Ecology of Zooplankton Communities. Univ Press New England, Hanover NH, pp 715–724
Oviatt CA (1981) Effects of different mixing schedules on phytoplankton, zooplankton, and nutrients in marine microcosms. Mar Ecol Prog Ser 4:57–67
Pacala S, Roughgarden J (1982) Resource partitioning and interspecific competition in two two-species insular Anolis lizard communities. Science 217:444–446
Paine RT (1966) Food web complexity and species diversity. Am Nat 100:65–75
Paine RT (1977) Controlled manipulations in the marine intertidal zone, and their contributions ecological theory. Academy of Natural Sciences, Philadelphia, Spec Publ 12:245–270
Pearre S Jr (1980) Feeding by Chaetognatha: The relation of prey size to predator size in several species. Mar Ecol Prog Ser 3:125–134
Pierce EL (1958) The Chaetognatha of inshore waters of North Carolina. Limnol Oceanogr 3:166–170
Reeve MR (1966) Observations on the biology of a chaetognath. In: Barnes, H (ed) Some Contemporary Studies in Marine Science. George Allen and Unwin, London, pp 613–630
Reeve MR (1970) The biology of Chaetognatha. 1. Quantitative aspects of growth and egg production in Sagitta hispida. In: Steele JH (ed) Marine Food Chains. Univ California Press, Berkeley, pp 168–189
Reeve MR, Walter MA (1972) Conditions of culture, food-size selection, and the effects of temperature and salinity on growth rate and generation time in Sagitta hispida Conant. J Exp Mar Biol Ecol 9:191–200
Thayer GW (1974) Identity and regulation of nutrients limiting phytoplankton production in the shallow estuaries near Beaufort, N.C. Oecologia (Berlin) 14:75–92
Vance RR (1972) Competition and mechanism of coexistence in three sympatric species of intertidal hermit crabs. Ecology 53:1062–1074
Vince SW, Valiela I, Teal JM (1981) An experimental study of the structure of herbivorous insect communities in a salt marsh. Ecology 62:1662–1678
Wilbur HM (1972) Competition, predation, and the structure of the Ambystoma-Rana sylvatica community. Ecology 53:3–21
Winer BJ (1971) Statistical Principles in Experimental Design, Second Edition. McGraw Hill, New York
Wise DH (1975) Food limitation of the spider Linyphia marginata: Experimental field studies. Ecology 56:637–646
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Fulton, R.S. Effects of chaetognath predation and nutrient enrichment on enclosed estuarine copepod communities. Oecologia 62, 97–101 (1984). https://doi.org/10.1007/BF00377381
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DOI: https://doi.org/10.1007/BF00377381