How Similar Are Branching Networks In Nature? A View From The Ocean: Caribbean Gorgonian Corals

[No abstract available]2221135138Brazeau, D., Lasker, H., Inter- and intraspecific variation in gorgonian colony morphology: Quantifying branching patterns in arborescent animals (1988) Coral Reefs, 7, pp. 139-143Burlando, B., Vietti, C., Parodi, R., Scardi, M., Emerging fractal properties in gorgonian growth forms Cnidaria Octocorallia (1991) Growth Dev. Aging, 55 (3), pp. 161-168Dodds, P.S., Rothman, D.H., Unified view of scaling laws for river networks (1999) Phys. Rev. E, 59 (5), pp. 4865-4877Dodds, P.S., Rothman, D.H., Geometry of river networks. I. Scaling, fluctuations, and deviations (2001) Phys. Rev. E., 63 (1). , 016117/1-10Franks, N.R., Britton, N.F., The possible role of reaction-diffusion in leaf shape (2000) Proc. R. Soc. London B, 267 (1450), pp. 1295-1300Lasker, H.R., Sánchez, J.A., Allometry and astogeny of modular organisms (2002) Reproductive Biology of Invertebrates, Vol. XI. Progress in Asexual Reproduction, pp. 207-253. , R.N. Hughes. New York: John WileyLasker, H.R., Boller, M.L., Castanaro, J., Sánchez, J.A., Colony Astogeny in an Octocoral Exhibiting Multiple Levels of Modularity, , submittedMistri, M., Ceccherelli, V.U., Growth of the Mediterranean gorgonian Lophogorgia ceratophyta (L., 1758) (1993) Mar. Ecol., 14 (4), pp. 329-340Mitchell, N.D., Dardeau, M.R., Schroeder, W., Colony morphology, age structure, and relative growth of two gorgonian corals, Leptogorgia hebes (Verrill) and Leptogorgia virgulata (Lamarck), from the northern Gulf of Mexico (1993) Coral Reefs, 12, pp. 65-70Montgomery, D.R., Dietrich, W.E., Channel initiation and the problem of landscape scale (1992) Science, 255, pp. 826-830Pelletier, J.D., Turcotte, D.L., Shapes of river networks and leaves: Are they statistically similar? (2000) Philos. Trans. R. Soc. London B, 355, pp. 307-311Rodriguez-Iturbe, I., Rinaldo, A., (1997) Fractal River Basins: Chance and Self-organization, , London, New York: Cambridge University PressSánchez, J.A., Lasker, H.R., Nepomuceno, E.G., Sánchez, J.D., Woldenberg, M.J., Branching and Self-organization in Marine Modular Colonial Organisms: a Model, , submittedTokunaga, E., Consideration on the composition of drainage networks and their evolution (1978) Geogr. Rep. Tokyo Metro. Univ., 13, pp. 1-27Turcotte, D.L., Newman, W.I., Symmetries in geology and geophysics (1996) Proc. Natl Acad. Sci. USA, 93, pp. 14295-14300Turcotte, D.L., Pelletier, J.D., Newman, W.I., Networks with side branching in biology (1998) J. theor. Biol., 193, pp. 577-592Witten, T.A., Sander, L.M., Diffusion-limited aggregation (1983) Phys. Rev B, 27 (9), pp. 5686-569

Temperature-mediated transitions between isometry and allometry in a colonial, modular invertebrate

The evolutionary success of animal design is strongly affected by scaling and virtually all metazoans are constrained by allometry. One body plan that appears to relax these constraints is a colonial modular (CM) design, in which modular iteration is hypothesized to support isometry and indeterminate colony size. In this study, growth rates of juvenile scleractinians (less than 40 mm diameter) with a CM design were used to test this assertion using colony diameters recorded annually for a decade and scaling exponents (b) for growth calculated from double logarithmic plots of final versus initial diameters. For all juvenile corals, b differed significantly among years, with isometry (b=1) in 4 years, but positive allometry (b>1) in 5 years. The study years were characterized by differences in seawater temperature that were associated significantly with b for growth, with isometry in warm years but positive allometry in cool years. These results illustrate variable growth scaling in a CM taxon and suggest that the switch between scaling modes is mediated by temperature. For the corals studied, growth was not constrained by size, but this outcome was achieved through both isometry and positive allometry. Under cooler conditions, positive allometry may be beneficial as it represents a growth advantage that increases with size