Summary
Growth rates and reproduction of a branching coral (Stylophora pistillata) were compared in the presence and in the absence of intraspecific competition. Field experiments demonstrated a significant decline in the growth rate of competing colonies compared to noncompeting control colonies; the growth rate slowed in all of the interacting individuals, irrespective of their place in the hierarchy of the intraspecific dominance or of their color morph. In case of immediate killing of the subordinate, the dominant colony grew at a normal rate. In addition to the marked decrease in the growth rate of interacting colonies, the typical symmetry shape of these colonies was changed to an abnormal growth form. The number of female gonads per polyp was significantly reduced in colonies competing intraspecifically, and the typical synchrony in reproduction among different branches of a given colony was changed and desynchronized. Again, these results did not correlate with the hierarchy of dominance. We conclude that intraspecific competition in reef corals involves great investment of energy. The ecological significance and the different pathways of this competition are discussed.
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References
Bak RPM, Termaat RM, Dekker R (1982) Complexity of coral interactions: influence of time, location of interactions and epifauna. Mar Biol 69:215–222
Barnes DJ (1972) The structure and formation of growth ridges in scleractinian coral skeletons. Proc R Soc Lond Ser B 182:331–350
Bradbury RH, Young PC (1981) The race and the swift revisited, or is aggression between corals important? In: Gomez E (ed) Proc Fourth Int Coral Reef Symp II pp 351–356
Chornesky EA (1983) Induced development of sweeper tentacles on the reef coral Agaricia agaricites: a response to direct competition. J Biol Bull 165:569–581
Colinvaux PA (1973) Introduction to ecology. John Wiley and Sons, NY, pp 621
Connell JH (1976) Competitive interactions and the species diversity of corals. In: Mackie GO (ed) Coelenterate ecology and behavior. Plenum Press, pp 51–68
Connell JH (1983) On the prevalence and relative importance of interspecific competition: Evidence from field experiments. Am Nat 122:661–669
Davis LV (1966) Inhibition of growth and regeneration in Hydra by crowded culture water. Nature 212:1215–1217
den Hartog JC (1977) The marginal tentacles of Rhodactis sanctithomae (Corallimorpharia) and the sweeper tentacles of Montastrea cavernosa (Scleractinia); their cnidom and possible function. In: Taylor DL (ed) Proc Third Int Coral Reef Symp, Univ of Miami Press, pp 463–469
Dustan P (1975) Genecological differentiation in the reef-building coral Montastrea annularis. Ph D thesis. State Univ of New York at Stony Brook, pp 300
Francis L (1976) Social organization within clones of the sea anemone Anthopleura elegantissima. Biol Bull 150:361–376
Goreau NI, Goreau TJ, Raymond LH (1981) Settling, surviviorship and spatial aggregation in planulae and juveniles of the coral Porites porites (Pallas). Bull Mar Sci 31:424–435
Ivker FB (1972) A hierarchy of histo-incompatibility in Hydractinia echinata. Biol Bull 143:162–174
Lang JC (1971) Interspecific aggression by scleractinian corals. I. The rediscovery of Scolymia cubensis (Milne Edwards and Haime). Bull Mar Sci 21:952–959
Lang JC (1971) Interspecific aggression by scleractinian corals. II. Why the race is not always to the swift. Bull Mar Sci 23:260–279
Lewis JB, Price WS (1975) Feeding mechanisms and feeding strategies of Atlantic reef corals. J Zool Lond 176:527–545
Loya Y (1976) The Red Sea coral Stylophora pistillata is an r strategist. Nature 259:478–480
Porter JW (1974) Community structure of coral reefs on opposite sides of the isthmus of Panama. Science 86:543–545
Potts DC (1976) Growth interactions among morphological variants of the coral Acropora palifera. In: Mackie GO (ed) Coelenterate ecology and behavior. Plenum Press pp 79–88
Richardson CA, Dustan P, Lang JC (1979) Maintenance of living space by sweeper tentacles of Montastrea cavernosa. Mar Biol 55:181–186
Rinkevich B, Loya Y (1979a) The reproduction of the Red Sea coral Stylophora pistillata. I. Gonads and planulae. Mar Ecol Prog Ser 1:133–144
Rinkevich B, Loya Y (1979b) The reproduction of the Red Sea coral Stylophora pistillata II. Synchronization in breeding and seasonality of planulae shedding. Mar Ecol Prog Ser 1:145–152
rinkevich B, Loya Y (1983a) Intraspecific competitive networks in the Red Sea coral Stylophora pistillata. Coral Reefs 1:161–172
Rinkevich B, Loya Y (1983b) Oriented translocation of energy in grafted reef corals. Coral Reefs 1:243–247
Sheppard CRC (1979) Interspecific aggression between reef corals with referece to their distribution. Mar Ecol Prog Ser 1:237–247
Thorp JH, Barthalmus GT (1975) Effects of crowding on growth rate and symbiosis in green hydra. Ecology 56:206–212
Wahle CM (1980) Detection, pursuit and overgrowth of tropical gorgonians by milleporid hydrocorals: Perseus and medusa revisisted. Science 209:689–691
Wellington GM (1980) Reversal of digestive interactions between Pacific reef corals: mediation by sweeper tentacles. Oecologia (Berlin) 47:340–343
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Rinkevich, B., Loya, Y. Intraspecific competition in a reef coral: effects on growth and reproduction. Oecologia 66, 100–105 (1985). https://doi.org/10.1007/BF00378559
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DOI: https://doi.org/10.1007/BF00378559