Abstract
Field experiments were designed to evaluate the role of predators in the Wadden Sea, small predators like shore crabs, shrimps and gobies, and large ones like flatfish and birds. Exclosures, maintained in aCorophium volutator bed, an eelgrass bed, in a sandy and a muddy flat, protected the infauna from such epibenthic predation. The resulting changes in the macrofauna were recorded and compared with an unaffected control area. In sandy and muddy flats of the lower intertidal zone, cages (mesh size≤5 mm) altered abundance and composition of the infauna almost entirely. Nearly all species achieved higher population densities than in the control area, and in addition, the number of species increased as well. In the the scarcely populated mud flat a dense suspension-feeder assemblage emerged, associated with numerous tube-building polychaetes. The sand flat, normally dominated by deposit feeders, also became occupied by a dense suspension-feeder assemblage, mainly cockles. In contrast, narrowly meshed cages had only little effect in the beds of eelgrass and ofCorophium volutator. Both are positioned in the upper intertidal zone. Although a number of species still responded with significant increases in abundance, many remained indifferent or even tended to be less abundant within cages. Cages provided with a 20-mm mesh nylon net, excluding only birds, flatfish and the biggest crabs, increased significantly the survival of large-sized infaunal members. This was only apparent in the upper intertidal zone. It was concluded, that small sized epibenthic predators are the major determinants of the dynamic species abundance pattern of the lower intertidal flats. In the eelgrass bed, the meshwork of rootlets constitutes an important spatial refuge from these predators. The complex habitat structure causes a diversified faunal assemblage. TheCorophium bed in the uppermost intertidal zone is less accessable to predators like crabs, shrimp and gobies. The monotonous appearance of this faunal assemblage is assumed to be the outcome of competitive exclusion and of occasional harsh physical conditions.
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Literature Cited
Arntz W. E., 1977. Results and problems of an “unsuccessful” benthos cage predation experiment. In: Biology of benthic organisms. Ed. by B. F. Keegan, P. O. Céidigh & P. J. S. Boaden. Pergamon Press, New York, 31–44.
Baggerman, B., 1953. Spatfall and transport ofCardium edule L. Archs. néerl. Zool.10, 315–342.
Bartsch, J., 1973. Zur Nahrungsaufnahme vonTetrastemma melanocephalum (Nemertini). Helgoländer wiss. Meeresunters.25, 326–331.
Beukema, J. J., 1973. Migration and secondary spatfall ofMacoma baltica (L.) in the western part of the Wadden Sea. Neth. J. Zool.23, 356–357.
Blegvad, H., 1928. Quantitative investigations of bottom invertebrates in the Limfjord 1910–1927 with special reference to the plaice-food. Rep. Danish Biol. Stn34, 33–52.
Boyden, C. R., 1972. Relationship of size to age in the cocklesCerastoderma edule andC. glaucum from the River Crouch Estuary, Essex. J. Conch., Lond.27, 475–489.
Connell, J. H., 1973. Community interactions on marine rocky intertidal shores. A. Rev. Ecol. Syst.3, 47–57.
—, 1975. Some mechanisms producing structure in natural communities: A model and evidence from field experiments. In: Ecology and evolution of communities. Ed. by M. L. Cody & J. M. Diamond. Belknap Press, Cambridge, 460–490.
Den Hartog, C., 1971. The dynamic aspect in the ecology of sea-grass communities. Thalassia jugosl.7, 101–112.
Fenchel, T., 1975. Factors determining the distribution patterns of mud snails (Hydrobiidae). Oecologia20, 1–17.
Goodhart, C. B., 1941. The ecology of the amphipoda in a small estuary in Hampshire. J. Anim. Ecol.10, 306–322.
Hancock, D. A. & Urquhart, A. E., 1965. The determination of natural mortality and its causes in an exploited population of cockles (Cardium edule L.). Fishery Invest., Lond. (Ser. 2)24 (2), 1–40.
Hartmann-Schröder, B., 1971. Annelida, Polychaeta. Tierwelt Dtl.58, 1–594.
Healy, M. C., 1972. On the population ecology of the common goby in the Ythan estuary. J. nat. Hist.6, 133–145.
Jackson, J. B. C., 1972. The ecology of the molluscs ofThalassia communities, Jamaica, West Indies. II. Molluscan population variability along environmental stress gradient. Mar. Biol.14, 304–337.
Jacobsen, V. H., 1967. The feeding of the lugworm,Arenicola marina (L.). Ophelia4, 91–109.
Klein Breteler, W. C. M., 1976. Migration of the shore crab,Carcinus maenas, in the Dutch Wadden Sea. Neth. J. Sea Res.10, 338–353.
Krüger, F., 1971. Bau und Leben des WattwurmesArenicola marina. Helgoländer wiss. Meeresunters.22, 149–200.
Kuipers, B., 1973. On the tidal migration of young plaice (Pleuronectes platessa) in the Wadden Sea. Neth. J. Sea Res.6, 376–388.
Linke, O., 1939. Die Biota des Jadebusens. Helgoländer wiss. Meeresunters.1, 201–348.
Lloyd, M., 1967. Mean Crowding. J. Anim. Ecol.36, 1–30.
Menge, B. A. & Sutherland, J. P., 1976. Species diversity gradients: Synthesis of the roles of predation, competition, and temporal heterogeneity. Am. Nat.101, 351–369.
Miller, P. J., 1975. Age-structure and life-span in the common goby,Pomatoschistus microps. J. Zool., Lond.177, 425–448.
Muus, B. J., 1967. The fauna of Danish estuaries and lagoons. Meddr. Danm. Fisk.-og. Havunders.5, 1–316.
Orth, R. J., 1975. Destruction of eelgrass,Zostera marina, by the cownose ray,Rhinoptera bonasus, in the Chesapeake bay. Chesapeake Sci.16, 205–208.
Paine, R. T., 1966. Food web complexity and species diversity. Am. Nat.100, 65–75.
—, 1974. Intertidal community structure. Oecologia15, 93–120
Rasmussen, E., 1973. Systematics and ecology of the Isefjord marine fauna. Ophelia11, 1–507.
Rhoads, D. C. & Young, D. K., 1970. The influence of deposit feeding organisms on sediment stability and community trophic structure. J. mar. Res.28, 150–178.
Reise, K., 1977a. Predation pressure and community structure of an intertidal soft-bottom fauna. In: Biology of benthic organisms. Ed. by B. F. Keegan, P. O. Céidigh & P. J. S. Boaden. Pergamon Press, New York, 513–519.
—, 1977b. Predator exclusion experiments in an intertidal mud flat. Helgoländer wiss. Meeresunters.30, 263–271.
Ropes, J. W., 1968. The feeding habits of the green crab,Carcinus maenas (L.). Fish. Bull. U.S.67, 183–203.
Sachs, L., 1969. Statistische Auswertungsmethoden. Springer, Berlin, 1–677.
Smith, O. R., 1954. Fencing in flats may save clams from green crabs. Maine Coast Fish8 (8), 20.
Thamdrup, H. M., 1935. Beiträge zur Ökologie der Wattenfauna. Meddr. Danm. Fisk.-og Havunders. (Fiskeri)10 (2), 1–125.
Watkin, E. E., 1941. The yearly life cycle of the amphipodCorophium volutator. J. Anim. Ecol.10, 77–93.
Wohlenberg, E., 1937. Die Wattenmeer-Lebensgemeinschaften im Königshafen von Sylt. Helgoländer wiss. Meeresunters.1, 1–92.
Woodin, S. A. 1974. Polychaete abundance patterns in a marine soft-sediment environment. Ecol. Monogr.44, 171–187.
—, 1976a. Adult-larval interactions in dense infaunal assemblages: Patterns of abundance. J. mar. Res.34, 25–41.
—, 1976b. Structural heterogeneity and predation in an infaunal system. Am. Zool.16, 195.
Young, D. K., Buzas, M. A., and Young, M. W., 1976. Species densities of macrobenthos associated with seagrass: A field experimental study of predation. J. mar. Res.34, 577–592.
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Reise, K. Experiments on epibenthic predation in the Wadden Sea. Helgolander Wiss. Meeresunters 31, 55–101 (1978). https://doi.org/10.1007/BF02296991
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DOI: https://doi.org/10.1007/BF02296991