• Publications
  • Influence
Symmetry Breaking and the Evolution of Development
TLDR
Declining frequencies of spontaneous asymmetry reversal throughout vertebrate evolution suggest that heart development has become more canalized, suggesting genetic assimilation is a common mode of evolution.
EVOLUTIONARY HISTORY OF NORTHERN HEMISPHERE NUCELLA (GASTROPODA, MURICIDAE): MOLECULAR, MORPHOLOGICAL, ECOLOGICAL, AND PALEONTOLOGICAL EVIDENCE
TLDR
A hypothesis of phylogenetic relationships for all of the currently recognized species of northern hemisphere Nucella is presented, based on an analysis of 718 base pairs of nucleotide sequence from the mitochondrial cytochrome b gene.
Effect of crab effluent and scent of damaged conspecifics on feeding, growth, and shell morphology of the Atlantic dogwhelk Nucella lapillus (L.)
TLDR
The perceived risk of predation appears to have a dramatic effect on the rates of feeding and growth of N. lapillus.
From symmetry to asymmetry: phylogenetic patterns of asymmetry variation in animals and their evolutionary significance.
  • A. R. Palmer
  • Biology
    Proceedings of the National Academy of Sciences…
  • 10 December 1996
TLDR
The phylogenetic transition from antisymmetry to directional asymmetry suggests that many cases of laterally fixed asymmetries evolved via genetic assimilation, and the ontogenetic origin of asymmetry significantly influences its subsequent evolution.
Chimpanzee right-handedness reconsidered: Evaluating the evidence with funnel plots.
  • A. R. Palmer
  • Psychology, Biology
    American journal of physical anthropology
  • 1 June 2002
TLDR
Funnel plots, and the more refined statistical tests they suggest, confirm that the current evidence for population-level right-handedness in chimpanzees remains equivocal.
Effect of crab effluent and scent of damaged conspecifics on feeding, growth, and shell morphology of the Atlantic dogwhelk Nucella lapillus (L.)
  • A. R. Palmer
  • Environmental Science, Biology
    Hydrobiologia
  • 2004
TLDR
Both field and laboratory evidence suggest that the exposed-shore population was much more labile morphologically than the protected- shore population, and in many instances, particularly among starved snails, the development of antipredatory shell traits was greater in the fish-crab treatment than in the snail-crabs treatment.
MORPHOLOGICAL PHYLOGENY OF ALPHEID SHRIMPS: PARALLEL PREADAPTATION AND THE ORIGIN OF A KEY MORPHOLOGICAL INNOVATION, THE SNAPPING CLAW
TLDR
The first phylogenetic hypothesis of relationships among 36 extant genera of alpheid shrimps is presented, based on a cladistic analysis of 122 morphological characters from 56 species, and this hypothesis is used to explore evolutionary trends in morphology and species diversity.
FISH PREDATION AND THE EVOLUTION OF GASTROPOD SHELL SCULPTURE: EXPERIMENTAL AND GEOGRAPHIC EVIDENCE
  • A. R. Palmer
  • Environmental Science, Geography
    Evolution; international journal of organic…
  • 1 June 1979
TLDR
The present study represents the first experimental examination of the types of shell morphologies that offer an effective defense against shell-crushing fishes and rays and test the importance of stout spines as a potential defense against crushing by fish.
Water-borne stimuli released by predatory crabs and damaged prey induce more predator-resistant shells in a marine gastropod.
TLDR
Results indicate that water-soluble chemical cues released by this predatory crab and by damaged conspecifics induced T. lamellosa to improve the defense effectiveness of their shells.
Something Darwin didn't know about barnacles: spermcast mating in a common stalked species
TLDR
Observations overturn over a century of beliefs about what barnacles can and cannot do in terms of sperm transfer, raise doubts about prior claims of self-fertilization in barnacles, and raise interesting questions about the capacity for sperm capture in other species (particularly those with short penises).
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