Abstract
It is becoming increasingly evident that the efficiency of zooplankton grazing on algae is not only a matter of quantity of the grazer relative to its food. Planktonic primary producers are not defenseless food-particles that are easily harvested by the consumers. Several algal species are able to adjust their phenotype (colony formation, spines, size) in such a way that it results in a reduced grazing pressure. It was recently demonstrated that morphological changes in the cell wall of green algae, induced by nutrient limitation and UV-B stress, may reduce their digestibility. A high fraction of induced cells pass intact and viable through the gut of the zooplankters, such that the grazing impact on the population is strongly reduced. It was also found that the presence of exudates (infochemicals) released by daphnids may change the morphology of algae. Unicellular green algae of the genus Scenedesmus were induced to form eight-cell coenobial types, heavily armed with spines, within three to five days after adding filtered water from an algal culture with Daphnia present. Both defence mechanisms may play an important role in zooplankton production and competition, and may serve as an example of highly efficient strategies to resist heavy grazing pressure.
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References
Burns CW (1968) The relationship between body size of filter-feeding Cladocera and the maximum size of particles ingested. Limnol Oceanogr 13: 675–678
De Bernardi R and Guissani G (1990) Are blue-green algae suitable food for zooplankton? An overview. Hydrobiologia 200/201: 29–41
De Lange HJ and Van Donk E (1997) Effects of UV-B irradiated algae on life history trains of Daphnia pulex. Freshwater Biol, in press
Demott WR and Moxter F (1991) Foraging on cyanobacteria by copepods: responses to chemical defences and resource abundance. Ecology 72: 1820–1834
Dodson SI (1989) Predator-induced reaction norms. BioScience 39: 447–452
Fulton RS and Paerl HW (1987) Effects of colonial morphology on zooplankton utilization of algal resources during blue-green algal (Microcystis aeruginosa) blooms. Limnol Oceanogr 32: 634–644
Futuyma DJ (1983) Evolutionary interactions among herbivorous insects and plants. In: Futuyma DJ and Slatkin M (eds.), Coevolution (pp. 207–231). Sinauer.
Groeger AW, Schram MD and Richard G (1991) Influence of food quality on growth and reproduction in Daphnia. Freshwater Biol 26: 11–19
Harvell CD (1984) Predator-induced defences in a marine bryozoan. Science 224: 1357–1359
Harvell CD (1990) The ecology and evolution of inducible defences. Quart Rev Biol 65: 323–341
Havel JE (1987) Predator induced defences: A review. In: Kerfoot WC and Sih A (eds.). Predation: direct and indirect impacts on aquatic communities (pp. 263–278). Univ. Press of New England, Hanover, NH.
Hessen DO (1990) Carbon, nitrogen and phosphorus status in Daphnia at varying food conditions. J Plankton Res 12: 1239–1249
Hessen DO and Van Donk E (1993) Morphological changes in Scenedesmus induced by substances released from Daphnia. Arch Hydrobiol 127: 129–140
Jeffries M (1990) Evidence of induced plant defences in a pondweed. Freshwater Biol 23: 265–269
Lampert W (1987) feeding and nutrition in Daphnia. Mem Ist Ital Idrobiol 45: 143–192
Lampert W, Rothhaupt KO and von Elert E (1994) Chemical induction of colony formation in a green alga (Scenedesmus acutus) by grazers (Daphnia). Limnol Oceanogr 39: 1543–1550
Larsson P and Dodson S (1993) Invited review: Chemical communication in planktonic animals. Arch Hydrobiol 129: 129–155
Lürling M and Van Donk E (1996) Zooplankton induced unicell-colony transformation in Scenedesmus and the effect on growth of herbivore Daphnia. Oecologia 108: 432–437
Lürling M and Van Donk E (1997a) Life history consequences in Daphnia pulex feeding on nutrient limited phytoplankton. Freshwater Biol, in press
Lürling M and Van Donk E (1997b) Morphological changes in the alga Scenedesmus induced by an infochemical released in situ from zooplankton grazers. Limnol Oceanogr, in press
Mattson WJ (1980) Herbivory in relation to plant nitrogen content. Annu Rev Ecol Syst 11: 119–161
Mitchell SF, Trainor FR, Rich PH and Goulden CE (1992) Growth of Daphnia magna in the laboratory in relation to the nutritional status of its food species, Chlamydomonas reinhardtii. J Plankton Res 14: 379–391
Porter KG (1973) Selective grazing and differential digestion of algae by zooplankton. Nature 244: 179–180
Porter KG (1975) Viable gut passage of gelatinous green algae ingested by Daphnia. Verh Int Verein Limnol 19: 2840–2850
Reynolds CS (1984) The ecology of freshwater phytoplankton. Cambridge
Ringelberg J (1991) A mechanism of predator-mediated induction of diel vertical migration in Daphnia hyalina. J Plankton Res 13: 83–89
Schlichting CD (1989) Phenotypic integration and environmental change. BioScience 39: 460–464
Sommer U (1992) Phosphorus-limited Daphnia-intraspecific faciliation instead of competition. Limnol Oceanogr 37: 966–973
Sterner RW, Hagemeier DD, Smith WL and Smith RF (1993) Phytoplankton nutrient limitation and food quality for Daphnia. Limnol Oceanogr 38: 857–871
Van Donk E and Hessen DO (1993) Grazing resistance in nutrient stressed phytoplankton. Oecologia 93: 508–511
Van Donk E and Hessen DO (1995) Reduced digestibility of UV-B stressed and nutrient-limited algae by Daphnia magna. Hydrobiologia 307: 147–151
Van Donk E, Lürling M, Hessen DO and Lokhorst B (1997a) Altered cell wall morphology in nutrient deficient phytoplankton and its impact on grazers. Limnol Oceanogr 42: 357–364
Van Donk E, Lürling M and Lampert W (1997b) Consumer-induced changes in phytoplankton: inducibility, costs, benefits and the impact on grazers. In: Harvell and Tollrian (eds.). Consequences of inducible defences for population biology. Princeton University Press, in press
Veen A, Reuvers M and Ronçak P (1995) Effects of acute and chronic UV-B exposure on a green alga: A continuous culture study using a computer-controlled dynamic light regime. In: Veen, A, Buma AGJ, Gieskes WWC and Van Liere L (eds.). Effects of ozon related UV-B enhancement on aquatic ecosystems, RIVM-report 731054002, 122 pp.
Watanabe Y (1990) C:N:P ratios of size-fractionated seston and planktonic organisms in various trophic levels. Int Ver Theor Angew Limnol Verh 24: 195–199
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Van Donk, E. Defenses in phytoplankton against grazing induced by nutrient limitation, UV-B stress and infochemicals. Aquatic Ecology 31, 53–58 (1997). https://doi.org/10.1023/A:1009951622185
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DOI: https://doi.org/10.1023/A:1009951622185