An intertidal population of Gammarus palustris Bousfield was sampled over a 23-month period and analyzed by a modified form of the egg-ratio method. Total numbers and size-frequency distributions revealed small numbers in the early spring which later increased to a peak in the summer months. This was followed by a marked reduction near the end of sumer and a subsequent rise in numbers during the early fall. Finally there was a second decrease to very low numbers in the late fall and early winter. Average brood size was calculated and used as an indication of food limitation. Attempts to correlate this with per capita rate of change (r), birth rate (\((\hat b)\)and death rate (\((\hat d)\)) suggested that the population increase in the early summer was food-rather than predator-limited. The late summer decline appears to be the result of predation pressure as well as food limitation. The fall peak is attributed to juvenile release from ovigerous femals escaping previous predation and to an increase in adult males resulting from a release in predation pressure. The winter decline may be due to adverse environmental conditions.
This is a preview of subscription content, log in to check access.
Buy single article
Instant access to the full article PDF.
Price includes VAT for USA
Subscribe to journal
Immediate online access to all issues from 2019. Subscription will auto renew annually.
This is the net price. Taxes to be calculated in checkout.
Allan, J.D.: Competition and the relative abundance of two cladocerans, 110 pp. Ph.D. Thesis, Ann Arbor: University of Michigan 1971
Bousfield, E.L.: New records of Gammarus (Crustacea; Amphipoda) from the Middle Atlantic region. Chesapeake Sci. 10, 1–17 (1969)
—: Shallow-water gammaridean Amphipoda of New England, 312 pp. Ithaca: Cornell University Press 1973
Brooks, J.L. and S.I. Dodson: Predation, body size and composition of plankton. Science, N.Y. 150, 28–35 (1965)
Clemens, H.P.: Life cycle and ecology of Gammarus fasciatus Say. Contr. Franz Theodore Stone Inst. Hydrobiol. 12, 1–61 (1950)
Cooper, W.E.: Dynamics and production of a natural population of a fresh-water amphipod, Hyalella azteca. Ecol. Monogr. 35, 377–394 (1965)
Dexter, D.M.: Life history of the sandy-beach amphipod Neohaustorius schmitzi (Crustacea: Haustoriidae) Mar. Biol. 8, 232–237 (1971)
Edmondson, W.T.: Reproductive rates of rotifers in natural populations. Memorie Ist. ital. Idrobiol. 12, 21–77 (1960)
Fraser, A.: Foraging strategies in three species of Fundulus. M.S. thesis, 54 pp. University of maryland, College Park 1973
Gable M.F.: The salt marsh amphiphod Gammarus palustris Bousfield, 1969, at the northern limit of its distribution: I. Ecology. II. Temperature-salinity tolerance, 190 pp. Ph.D. thesis, University of New Hamphsire, Durham 1972
Hall, D.J.: An experimental approach to the dynamics of a natural population of Daphnia galeata mendotae. Ecology 45, 94–112 (1964)
Ivlev, V.S.: Experimental ecology of the feeding of fishes, 302 pp. New Haven: Yale University Press 1961
Kinne, O. (Ed.) Marine ecology, Vol. I. Environmental factors, Part 1. 681 pp. London: Wiley Interscience 1970
Mathias, J.A.: Energy flow and secondary production of the amphipods Hyalella azteca and Crangonyx richmondensis occidentalis in Marion Lake, British Columbia. J. Fish. Res. Bd Can. 28, 711–726 (1971)
Rees, C.P.: The life-cycle of the amphipod Gammarus palustris Bousfield. Estuar. cstl mar. Sci. (1975). (In press)
Sameoto, D.D.: Some aspects of the ecology and life cycle of three species of subtidal sandburrowing amphipods (Crustacea: Haustoridae) J. Fish. Res. Bd Can. 26, 1321–1345 (1969)
Slobodkin, L.B.: Population dynamics in Daphnia obtusa Kurz. Ecol. Monogr. 24, 69–88 (1954)
Steele, D.H. and Y.J. Steele: The biology of Gammarus (Crustacea, Amphipoda) in the northwestern Atlantic. VII. The duration of embryonic development in five species at various temperatures. Can. J. Zool. 51, 995–999 (1973)
Strong, D.R.: Life history variation among populations of an amphipod (Hyalella azteca). Ecology 53, 1103–1111 (1971)
Stross, R.G., J.C. Neess and A.D. Hasler Turnover and production of the planktonic Crustacea in limed and reference portion of a bog lake. Ecology 42, 237–244 (1961)
The order of authorship was decided by the toss of a coin.
An erratum to this article is available at http://dx.doi.org/10.1007/BF00388443.
Communicated by M.R. Tripp, Newark
About this article
Cite this article
Van Dolah, R.F., Shapiro, L.E. & Rees, C.P. Analysis of an intertidal population of the amphipod Gammarus palustris using a modified version of the egg-ratio method. Marine Biology 33, 323–330 (1975). https://doi.org/10.1007/BF00390570
- Food Limitation
- Predation Pressure
- Brood Size
- Early Winter
- Early Fall