Abstract
Life-history variation was studied in three sympatric species of Stylopoma Levinsen [S. spongites (Pallas), S. projecta Canu and Bassler and Stylopoma n. sp. 15] in Panamá. Bryozoan colonies were collected from 27 reefs along 300 km of the Caribbean coast of Panamá. The distribution and abundance of each species were very patchy, but with broad overlap in occurrence among localities and depths. Nevertheless, species differed considerably in colony size, size at first reproduction and numbers of brooding larvae; implying that interspecific differences in life-history traits may contribute to their coexistence. To examine closely this variation in life-history patterns, we grew, in a common garden experiment, the offspring of the two most common species that were obtained from parent colonies collected from several reefs. There were highly significant differences in growth rates and the timing and extent of sexual reproduction which corresponded well to patterns observed in individuals from the field. Other factors, including size of larvae, extent of secondary zooidal calcification and numbers of avicularia were also correlated with differences in life histories. Despite this additional complexity, however, ecological consequences of trade-offs in life history among modular species such as Stylopoma spp. appear very similar to those among unitary species.
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References
Best BA, Winston JE (1984) Skeletal strength of encrusting cheilostomes. Biol Bull mar biol Lab, Woods Hole 167: 390–409
Bishop JDD (1989) Colony form and the exploitation of spatial refuges by encrusting Bryozoa. Biol Rev 64: 197–218
Buss LW, Jackson JBC (1979) Competitive networks: nontransitive competitive relationships in cryptic coral reef environments. Am Nat 113: 223–234
Buss LW, Jackson JBC (1981) Planktonic food availability and suspension-feeder abundance: evidence of in situ depletion. J exp mar Biol Ecol 49: 151–161
Chetham AH, Jackson JBC (1996) Speciation, extinction and the decline of arborescent growth in Neogene and Quaternary cheilostome Bryozoa of tropical America. In: Jackson JBC, Budd AF, Coates AG (eds) Evolution and environment in tropical America. University of Chicago Press, Chicago (in press)
Herrera A, Jackson JBC (1992) Environmental versus taxonomic variation in lophophore morphology of Panamanian cheilostome bryozoans. Mar Biol 112: 99–106
Herrera A, Jackson JBC (1996) Life history variation among “dominant” encrusting cheilostomes. In: Gordon D.P., Grant-Mackie J.A. Bryozoans in space and time. National Institute of Water and Atmospheric Research, Wellington, New Zealand (in press)
Hughes DJ, Jackson JBC (1990) Do constant environments promote complexity of form?: the distribution of bryozoan polymorphism as a test of hypotheses. Evolution 44: 889–905
Hughes DJ, Jackson JBC (1992) Distribution and abundance of cheilostome bryozoans on the Caribbean reefs of central Panama. Bull mar Sci 51: 443–465
Jackson JBC (1977) Competition on marine hard substrata: the adaptive significance of solitary and colonial strategies. Am Nat 111: 743–767
Jackson JBC (1979) Overgrowth competition between encrusting cheilostome ectroprocts in a Jamaican cryptic reef environment. J Anim Ecol 48: 805–823
Jackson JBC (1984) Ecology of cryptic coral reef communities. III. Abundance and aggregation of encrusting organisms with particular reference to cheilostome Bryozoa. J exp mar Biol Ecol 75: 37–57
Jackson JBC (1985) Distribution and ecology of clonal and aclonal bentic invertabrates. In: Jackson JBC, Buss W, Cook RE (eds) Population biology and evolution of clonal organisms. Yale University Press, New Haven, pp 297–356
Jackson JBC, Buss LW (1975) Allelopathy and spatial competition among coral reefs invertebrates. Proc natn Acad Sci USA 72: 5160–5163
Jackson JBC, Cheetham AH (1990) Evolutionary significance of morphospecies: a test with cheilostome Bryozoa. Science, NY 248: 579–583
Jackson JBC, Cheetham AH (1994) Phylogeny reconstruction and the tempo of speciation in cheilostome Bryozoa. Paleobiology 20: 407–423
Jackson JBC, Coates AG (1986) Life cycles and evolution of clonal (modular) animals. Phil Trans R Soc (Ser B) 313: 7–22
Jackson JBC, Hughes TP (1985) Adaptive strategies of coral-reef invertebrates. Am Scient 73: 265–274
Jackson JBC, Kaufmann KW (1987) Diadema antillarum was not a keystone predator in cryptic reef environments. Science, NY 235: 687–689
Jackson JBC, Wertheimer SP (1985) Patterns of reproduction in five common species of Jamaican reef-associated bryozoans. In: Nielsen C, Larwood GP Bryozoa: Ordovician to Recent. Olsen & Olsen, Fredensborg, Denmark, pp 161–168
Jackson JBC, Winston JE (1982) Ecology of cryptic coral reef communities. I. Distribution and abundance of major groups of encrusting organisms. J exp mar Biol Ecol 57: 135–147
Jennrich R, Sampson P, Frane J (1988) Analysis of variance and covariance with repeated measures. In: Dixon WJ (ed) BMDP statistical software manual. Vol 1. University of California Press, Berkeley, pp 483–519
Karlson RH, Jackson JBC (1981) Competitive networks and community structure: a simulation study. Ecology 62: 670–678
Lidgard S, Jackson JBC (1989) Growth in encrusting cheilostome bryozoans. I. Evolutionary trends. Paleobiology 15: 255–282
McKinney FK, Jackson JBC (1989) Bryozoan evolution Unwin & Hyman, Boston
Norusis MJ (1988) SPSS/PC + advanced statistics. SPSS Inc., Chicago
Palumbi SR, Jackson JBC (1982) Ecology of cryptic coral reef communities. II. Recovery from small disturbance events by encrusting Bryozoa: the influence of “host” species and lesion size. J exp mar Biol Ecol 64: 103–115
Pielou EC (1969) An introduction to mathematical ecology, Wiley Interscience, New York
Sterarns SC (1992) The evolution of life histories Oxford University Press, Oxford
Winston JE (1984) Shallow-water bryozoans of Carrie Bow Cay, Belize. Am Mus Novit 2799: 1–38
Winston JE (1985) Life history studies of Disporella and Drepanophora in Jamaica. In: Nielsen C, Larwood GP (eds) Bryozoa: Ordovician to Recent. Olsen & Olsen, Fredensborg, Denmark, p. 350
Winston JE, Jackson JBC (1984) Ecology of cryptic coral reef communities. IV. Community development and life histories of encrusting cheilostome Bryozoa. J exp mar Biol Ecol 76: 1–21
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Communicated by N. H. Marcus, Tallahassee
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Herrera, A., Jackson, J.B.C., Hughes, D.J. et al. Life-history variation in three coexisting cheilostome bryozoan species of the genus Stylopoma in Panamá. Marine Biology 126, 461–469 (1996). https://doi.org/10.1007/BF00354628
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DOI: https://doi.org/10.1007/BF00354628