Meeting Abstract 48-7  Sunday, Jan. 5 11:30 – 11:45  Prey, Populations, and the Pleistocene: Evidence for Low COI Variation in a Widespread North American Leech MACK, JM*; DE CARLE, D; KVIST, S; University of Toronto, Royal Ontario Museum, University of Maryland, College Park; University of Toronto, Royal Ontario Museum; University of Toronto, Royal Ontario Museum joemack@umd.edu Geographically […]

Meeting Abstract 48-6  Sunday, Jan. 5 11:15 – 11:30  Predator-induced plasticity across echinoderm life history stages BARNES, DK*; ALLEN, JD; William & Mary; William & Mary dbarnes@email.wm.edu Marine invertebrates frequently exhibit complex life cycles, including major life history transitions that coincide with habitat changes. In many marine invertebrates, adults live on the bottom of the ocean (the […]

Meeting Abstract 48-4  Sunday, Jan. 5 10:45 – 11:00  Making it Big and Losing Friends: Algal Symbiont Contributions are Shaped by Sea Anemone Life History BEDGOOD, SA*; BRACKEN, MES; University of California Irvine; University of California Irvine sbedgood@uci.edu The stability of nutrient exchange in a mutualistic symbiosis is highly dependent on the availability of resources to both […]

Meeting Abstract 48-3  Sunday, Jan. 5 10:30 – 10:45  Exploring local adaptation to salinity and temperature variability in the copepod Tigriopus californicus LIGUORI, AL; Stony Brook University alyssa.liguori@stonybrook.edu https://alyssaliguori.com/ Local adaptation has been studied in a broad range of taxa for decades. However, we have limited understanding of how often local adaptation occurs in variable environments. Whether […]

Meeting Abstract 48-1  Sunday, Jan. 5 10:00 – 10:15  Breakthrough in Marine Invertebrate Cell Culture: Sponge Cells Divide Rapidly in Improved Nutrient Medium CONKLING, ME*; HESP, K; MUNROE, S; SANDOVAL, K; MARTENS, DE; SIPKEMA, D; WIJFFELS, RH; POMPONI, SA; Florida Atlantic University, Fort Pierce, FL; Wageningen University, Wageningen, NL; Wageningen University, Wageningen, NL; Wageningen University, Wageningen, NL; […]

WOURMS, J.P.: Rudimentary trophotaeniae of Ataeniobius embryos: an evolutionary intermediate of teleost trophotaenial placentae. Embryonic trophotaeniae, external hindgut derivatives, and the maternal ovarian epithelium comprise the trophotaenial placenta of goodeid and other fishes. For 60 years, Ataeniobius toweri was considered the only goodeid fish whose embryos lack trophotaeniae. Scanning EM, however, reveals three, external, rudimentary […]

GALIS, F.: Modularity and the conservation of characters determined in the phylotypic stage The phylotypic stage is the developmental stage at which vertebrates most resemble each other. In an earlier study we found support for Raff’s hypothesis that the remarkable conservation of the phylotypic stage in vertebrates is due to the high number of ongoing […]

MCCLINTOCK, J.M.*; JOZEFOWICZ, C.; CARLSON, R.; MANN, D.J.; PRINCE, V.E.: Hox gene patterning and fish evolution We are using the zebrafish to investigate the evolution of Hox gene patterning functions. Whereas tetrapods possess 4 clusters of Hox genes, zebrafish have 7 distinct clusters. This condition is most likely due to a whole genome duplication, which […]

JEFFERY, J.E.*; BININDA-EMONDS, O.R.P.; COATES, M.I.; RICHARDSON, M.K.: Heterochrony in Amniote Evolution Heterochrony is thought to be a major link between developmental mechanisms and the emergence of phenotypic difference above the species level (macroevolution). Heterochronies affecting the timing of discrete events are of particular importance during organogenesis. Within vertebrates, this is the mid-embryonic period when […]

SHAPIRO, M.D.: Developmental morphology and gene expression in lizard digit reduction Evolutionary digit loss in lizards has been attributed to truncations in ancestral developmental programs, while another hypothesis refutes this idea. However, neither hypothesis has been tested in a developmental framework. Among living tetrapods, Australian skinks may offer the best examples of graded limb reduction. […]