Abstract
Eutrophication of shallow coastal waters often leads to blooms of macroalgae. Grazing by crustaceans, such as amphipods and isopods, can reduce macroalgal biomass accumulation. At the same time, growth of the macroalgae can be stimulated by epiphyte removal. The role of grazing by isopods and amphipods on Ulva spp. biomass development was investigated in the Veerse Meer, a brackish lagoon situated in the southwest Netherlands. Exclusion of grazing in the field did not stimulate Ulva spp. growth. In fact, growth rates were higher in exclosures that allowed grazers to enter. Edibility tests identified the amphipod Gammarus locusta, and the isopods Idotea chelipes and Sphaeroma hookeri as potential grazers on Ulva spp. However, when epiphytic diatoms were present on the Ulva spp. thalli, Gammarus and Sphaeroma grazed on ephiphytes and not on Ulva tissue. Only Idotea continued to graze on Ulva spp. A laboratory growth experiment revealed a positive effect of Gammarus presence on Ulva spp. growth, probably caused by preferential removal of epiphytic diatoms from the Ulva spp. thalli. The growth stimulation by epiphyte removing grazers such as Gammarus may explain the higher growth rates in the presence of grazers observed in the field. When determining the potential role of invertebrate grazers in controlling macroalgal biomass accumulation, it is important to include an assessment of the epiphyte abundance on the macroalgae, as preferential removal of epiphytes may stimulate growth and thus have the opposite effect.
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References
Brawley SH and Adey WH (1981). The effects of micrograzers on algal community structure in a coral reef. Mar Biol 61: 167-177
Brawley SH and Fei XG, (1987). Studies of mesoherbivory in aquaria and in an unbarricaded mariculture farm on the Chinese coast. J Phycol 23: 614-623
Coosen J, Meire P, Stuart JJ and Seys J (1990). Trophic relationships in brackish Lake Veere: the role of macrophytes. In: Barnes M and Gibson RN (eds), Trophic Relationships in the Marine Environment. Proceedings of the 24th European Marine Biology Symposium. Aberdeen University Press, Aberdeen, pp. 404-423
Dudley TL (1992). Beneficial effects of herbivores on stream macroalgae via epiphyte removal. Oikos 65: 121-127
Duffy JE, (1990). Amphipods on seaweeds: partners or pests? Oecologia 83: 267-276
Fong P, Desmond JS and Zedler JB (1997). The effect of a horn snail on Ulva expansa (Chlorophyta): consumer or facilitator of growth? J Phycol 33: 353-359
Geertz-Hansen O, Sand-Jensen K, Hansen DF and Chistiansen A, (1993). Growth and grazing control of abundance of the marine macroalga, Ulva lactuca L. in a eutrophic Danish estuary. Aquat Bot 46: 101-109
Hay ME, Duffy JE and Pfister CA (1987). Chemical defences against different marine herbivores: are amphipods insect equivalents? Ecology 68: 1567-1580
Horne A, McClelland J and Valiela I (1994). The growth and consumption of macroalgae in estuaries: the role of invertebrate grazers along a nutrient gradient in Waquoit Bay, Massachusetts. Biol Bull 187: 279-280
Jernakoff P, Brearley A and Nielsen J (1996). Factors affecting grazer-epiphyte interactions in temperate seagrass meadows. Oceanog Mar Biol: an Ann Rev 34: 109-162
Kamermans P, Malta Ej, Verschuure JM, Lentz LF and Schrijvers L (1998). The role of cold resistance and burial for winter survival and spring initiation of an Ulva spp. (Chlorophyta) bloom in a eutrophic lagoon (Veerse Meer lagoon, he Netherlands). Mar Biol 131: 45-51
Koeman RPT and van den Hoek C (1981). The taxonomy of Ulva (Chlorophyceae) in the Netherlands. Br Phycol J 16: 9-53
KiØrboe T (1980). Distribution and production of submerged macrophytes in Tipper Grund (RingkØbing Fjord, Denmark), and the impact of waterfowl grazing. J Appl Ecol 17: 675-687
Lodge DM (1991). Herbivory on freshwater macrophytes. Aquat Bot 41: 195-224
Lotze HK and Worm B (2000). Variable and complementary effects of herbivores on different life stages of bloom-forming macroalgae. Mar Ecol Prog Ser 200: 167-175
Lotze HK, Worm B and Sommer U (2000). Propagule banks, herbivory and nutrient supply control population development and dominance patterns in macroalgalblooms. Oikos 89: 46-58
Lotze HK, Worm B and Sommer U (2001). Strong bottom-up and top-down control of early life stages of macroalgae. Limnol Oceanogr 46: 749-757
Lotze HK, Schramm W, Schories D and Worm B (1999). Control of macroalgal blooms at early developmental stages: Pilayella littoralis versus Enteromorpha spp. Oecologia 119: 46-54
Malta E-j, Draisma SGA and Kamermans P (1999). Free-floating Ulva in the Southwest Netherlands: species or morphotypes? A morphological, molecular and ecological comparison. Eur J Phycol 34: 443-454
Malta E-j and Verschuure JM (1997). Effects of environmental variables on between-year variation of Ulva growth and biomass in a eutrophic brackish lake. J Sea Res 38: 71-84
Malta E-J, Verschuure JM and Nienhuis PH (2000). Spatial variation of macroalgal biomass in a brackish eutrophic lake is caused by loss processes. In: Macroalgal mats in a eutrophic lagoon: dynamics and control mechanisms. Ph.D. Dissertation University of Nijmegen, pp. 27-40
Nienhuis PH and Groenendijk AM (1986). Consumption of eelgrass (Zostera marina) by birds and invertebrates: an annual budget. Mar Ecol Prog Ser 29: 29-35
Nienhuis PH and van Ierland ET (1978). Consumption of eelgrass, Zostera marina, by birds and invertebrates during the growing season in Lake Grevelingen (SW Netherlands). Neth J Sea Res 12: 180-194
Orth RJ and van Montfrans J (1984). Epiphyte-seagrass relationships with an emphasis on the role of micrograzing: a review. Aquat Bot 18: 43-69
Parker HS (1981). Influence of relative water motion on the growth, ammonium uptake and carbon and nitrogen composition of Ulva lactuca (Chlorophyta). Mar Biol 63: 309-318
Sand-Jensen K and Borum J (1991). Interactions among phytoplankton, periphyton, and macrophytes in temperate freshwaters and estuaries. Aquat Bot 41: 137-175
Sfriso A and Pavoni B (1994). Macroalgae and phytoplankton competition in the central Venice lagoon Environ Technol 15: 1-14
Sokal RR and Rohlf FJ (1995). Biometry. Third edition. W.H. Freeman and Company, New York, 887 pp
Valiela I, McClelland J, Hauxwell J, Behr PJ, Hersh D and Foreman K (1997). Macroalgal blooms in shallow estuaries: Controls and ecophysiological and ecosystem consequences. Limnol Oceanogr 42: 1105-1118
Vollenweider RA (1992). Coastal marine eutrophication: principles and control. In: Marine Coastal Eutrophication. Proceedings of an International Conference, Bologna, Italy, 21-24 March 1990, Elsevier, Amsterdam, pp. 1-20
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Kamermans, P., Malta, EJ., Verschuure, J.M. et al. Effect of grazing by isopods and amphipods on growth of Ulva spp. (Chlorophyta). Aquatic Ecology 36, 425–433 (2002). https://doi.org/10.1023/A:1016551911754
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DOI: https://doi.org/10.1023/A:1016551911754