Abstract
14C-radiolabelling experiments indicate that adult stages of the salt-marsh harpacticoid copepod Nitocra lacustris (Schmankevitsch) receive a large part of their nutrition through the ingestion and assimilation of certain diatoms. An abundance of empty diatom frustules occurs in the gutpellet contents of field-collected individuals. Naupliar stages do not ingest diatoms in the laboratory, and nauplii from the field do not contain frustules in their gut pellets. Ingestion of diatoms in the laboratory first occurs during the second or third copepodite stage. 3H-radiolabel expeiments and grazing experiments using bacterium-sized beads adhering to the diatoms indicated that both adults and nauplii ingest bacteria adhering to the outer mucus coating of the diatoms (and probably ingest the diatom mucus itself). Adults ingest bacteria (and probably mucus exopolymer) coincidently while ingesting diatoms. The nauplii ingest these components by scraping the outer surface of the diatoms. SEM observations indicate that diatoms are not punctured by the nauplii during feeding. While diatom mucus and associated bacteria play an (as yet unquantified) role in the nutrition of the adults, these components may comprise the bulk of food resources for naupliar stages.
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Allan, J. D., Richman, S., Heinle, D. R., Huff, R. (1977). Grazing in juvenile stages of some estuarine calanoid copepods. Mar. Biol. 43: 317–331
Azam, F., Holm-Hansen, O. (1973). Use of tritiated substrates in the study of heterotrophy in seawater. Mar. Biol. 23: 191–196
Bell, W. H., Sakshaug, E. (1980). Bacterial utilization of algal extracellular products. 2. A kinetic study of natural populations. Limnol. Oceanogr. 25: 1021–1033
Brown, T. J., Sibert, J. R. (1977). Food of some benthic harpacticoid copepods. J. Fish. Res. Bd Can. 34: 1028–1031
Carman K. R., Thistle, D. (1985). Microbial food partitioning by three species of benthic copepods. Mar. Biol. 88: 143–148
Chandler, G. T. (1986). High-density culture of meiobenthic harpacticoid copepods within a muddy sediment substrate. Can. J Fish. aquat. Sciences 43: 53–59
Chow-Fraser, P., Wong, C. K. (1986). Dietary changes during development in the freshwater calanoid copepod Epischura lacustris Forbes. Can. J. Fish. aquat. Sciences 43: 938–943
Chua, K. E., Brinkhurst, R. O. (1973). Bacteria as potential nutritional resources for three sympatric species of tubificid oligochaetes. In: Stevenson, L., Colwell, R. R. (ed.). Estuarine microbial ecology. University of South Carolina Press, Columbia, p. 513–517
Decho, A. W. (1986). Water-cover influences on diatom ingestion rates by meiobenthic copepods. Mar. Ecol. Prog. Ser. 33: 139–146
Decho, A. W., Castenholz, R. W. (1986). Spatial patterns and feeding of meiobenthic harpacticoid copepods in relation to resident microbial flora. Hydrobiologia 131: 87–96
Deutsch, A. (1978). Gut-ultrastructure and digestive physiology of two marine nematodes, Chromadorina germanica (Butschi, 1847) and Diplolaimella spp. Biol. Bull. mar. biol. Lab., Woods Hole 155: 317–335
Elster, A. (1936). Einige biologische Beobachtungen an Heterocope borealis Fischer (=H. weismanni mhof.). Int. Revue ges. Hydrobiol. Hydrogr. 33: 357–433
Fernández, F. (1979). Nutritional studies in the nauplius larva of Calanus pacificus (Copepoda: Calanoida). Mar. Biol. 53: 131–147
Hicks, G. R. F., Coull, B. C. (1983). The ecology of the marine meiobenthic harpacticoid copepods. Oceanogr. mar. Biol. A. Rev. 21: 67–175
Hobbie, J. E., Crawford, C. C. (1969). Respiration corrections for bacterial uptake of dissolved organic compounds in natural waters. Limnol. Oceanogr. 14: 528–532
Hobbie, J. E., Daley, R. J., Jasper, S. (1977). Use of Nuclepore filters for counting bacteria by fluorescence microscopy. Appl. envirl Microbiol. 33: 1225–1228
Hobbie, J. E., Lee, C. (1980). Microbial production of extracellular material: importance in benthic ecology. In: Tenore, K. R., Coull, B. C. (ed.) Marine benthic dynamics. University of South Carolina Press, Columbia, p. 341–346
Hollibaugh, J. T., Fuhrman, J. A., Azam, F. (1980). Radioactive labeling of natural assemblages of bacterioplankton for use in trophic studies. Limnol. Oceanogr. 25: 172–181
Jensen, P. (1982). Diatom feeding behavior of the free-living marine nematode Chromadorita tenuis. Nematologica 28: 71–76
Kutsky, R. J. (1981). Handbook of vitamins, minerals, and hormones, 2nd ed. Van Nostrand Reinhold, New York
Lee, J. J., Tietjen, J. H., Garrison, J. R. (1976). Seasonal switching in the nutritional requirements of Nitocra typica, a harpacticoid copepod from salt marsh aufwuchs communities. Trans. Am. microsc. Soc. 95: 628–637
Lee, J. J., Tietjen, J. H., Mastropaolo, C., Rubin, H. (1977). Food quality and the heterogeneous spatial distribution of meiofauna. Helgoländer wiss. Meeresunters. 30: 272–282
Lessard, E. J., Swift, E. (1985). Species-specific grazing rates of heterotrophic dinoflagellates in oceanic waters, measured with a dual-label radioisotope technique. Mar. Biol. 87: 289–296
Lewis, A. G. (1067). An enrichment solution for culturing the early developmental stages of the planktonic marine copepod Euchaeta japonica Marukawa. Limnol. Oceanogr. 12: 147–148
Maly, E. J., Maly, M. (1974). Dietary differences between two cooccurring calanoid copepod species. Oecologia 17: 325–333
Marshall, S. M., Orr, A. P. (1956): On the biology of Calanus finmarchicus. IX. Feeding and digestion in the young stages. J. mar. biol. Ass. U.K. 35: 587–603
Montagna, P. A. (1982). Sampling design and enumeration statistics for bacteria extracted from marine sediments. Appl. envirl Microbiol. 43: 1366–1372
Montagna, P. A. (1984). In situ measurement of meiobenthic grazing rates on sediment bacteria and edaphic diatoms. Mar. Ecol. Prog. Ser. 18: 119–130
Paffenh::ofer, G.-A. (1971). Grazing and ingestion rates of nauplii, copepodids and adults of the marine planktonic copepod Calanus helgolandicus. Mar. Biol. 11: 286–298
Phillips, N. W. (1984). Role of different microbes and substrates as potential suppliers of specific, essential nutrients to marine detritivores. Bull. mar. Sci. 35: 283–298
Provasoli, L., Shiraishi, K., Lance, J. R. (1959). Nutritional idiosyncrasies of Artemia and Tigriopus in monoxenic culture. Ann. N.Y. Acad. Sci. 77: 250–261
Rieper, M. (1978). Bacteria as food for marine harpacticoid copepods. Mar. Biol. 45: 337–345
Rieper, M. (1982). Feeding preferences of marine harpacticoid copepods for various species of bacteria. Mar. Ecol. Prog. Ser. 7: 303–307
Rieper, M., Flotow, C. (1981). Feeding experiments with bacteria, ciliates, and harpacticoid copepods. Kieler Meeresforsch. (Sonderh.). 5: 370–375
SAS Institute Inc. (1982). SAS user's guide: statistics. SAS Institute Inc. Cary, North Carolina
Sellner, B. W. (1976). Survival and metabolism of the harpacticoid copepod Thompsonula hyaenae (Thompson) fed on different diatoms. Hydrobiologia 50: 233–238
Smyly, W. J. P. (1970). Observations on the rate of development, longevity and fecundity of Acanthocyclops viridis (Jurine) (Copepoda: Cyclopoida) in relation to type of prey. Crustaceana 18: 21–36
Tietjen, J. H., Lee, J. J. (1973). Life history and feeding habits of the marine nematode Chromadora macrolaimoides Steiner. Oecologia 12: 303–314
Trotter, D. B., Webster, J. M. (1984). Feeding preferences and seasonality of free-living marine nematodes inhabiting the kelp Macrocystis integrifolia Mar. Ecol. Prog. Ser. 14: 151–157
Vanden Berghe, W., Bergmans, M. (1981). Differential food preferences in three co-occurring species of Tisbe (Copepoda: Harpacticoida). Mar. Ecol. Prog. Ser. 4: 213–219
Weinberg, J. R., Caswell, H., Whitlatch, R. B. (1986). Demographic importance of ecological interactions: how much do statistics tell us? Mar. Biol. 93: 305–310
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Communicated by J. M. Lawrence, Tampa
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Decho, A.W., Fleeger, J.W. Ontogenetic feeding shifts in the meiobenthic harpacticoid copepod Nitocra lacustris . Mar. Biol. 97, 191–197 (1988). https://doi.org/10.1007/BF00391302
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DOI: https://doi.org/10.1007/BF00391302