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Morphological convergence as a consequence of extreme functional demands: examples from the feeding system of natricine snakes
TLDR
The data suggest that the direction of evolution may be predictable if constraints are strong and evolutionary solutions limited, and that the observed morphological differences are likely biologically relevant as they affect the flow of water around the head. Expand
Ontogeny of intersexual head shape and prey selection in the pitviper Agkistrodon piscivorus
TLDR
Examining how head shape, head size and prey selection change over ontogeny in adult males, adult females and juveniles of the cottonmouth snake Agkistrodon piscivorus found that juveniles appear to undergo a rapid change in head volume, which subsequently slows considerably as sexual maturity is achieved. Expand
Induced ovulation and egg deposition in the direct developing anuran Eleutherodactylus coqui
TLDR
A low level of ovulation and egg deposition in response to all hormones is reported, with the most complete and consistent results from the non-natural D-Ala6, des-Gly10 ethylamide LHRH derivative. Expand
Are ontogenetic shifts in diet linked to shifts in feeding mechanics? Scaling of the feeding apparatus in the banded watersnake Nerodia fasciata
TLDR
Overall, these cranial allometries should enable watersnakes to meet the functional requirements of switching from fusiform fish to bulky frog prey, suggesting that positive allometry within the cranial musculoskeletal system may actually be a general characteristic of vertebrates. Expand
The functional meaning of “prey size” in water snakes (Nerodia fasciata, Colubridae)
TLDR
The functional challenges involved in prey transport depend not only upon prey mass, but also prey type (fish vs. frog) and prey shape (relative height, width and length), suggesting that from the perspective of a gape-limited predator, the difficulty of prey ingestion depends upon multiple aspects of prey size. Expand
Sexual dimorphism in head shape and diet in the cottonmouth snake (Agkistrodon piscivorus)
TLDR
Examining the relationships among body size, head shape and the functional aspects of diet in the adult male and female cottonmouth snake Agkistrodon piscivorus suggests that the observed shape differences may reflect functional differences in maximum gape between similarly sized male andFemale cottonmouths. Expand
Morphological integration and adaptation in the snake feeding system: a comparative phylogenetic study
TLDR
Testing in 12 monophyletic clades of macrostomatan snakes shows that head width is significantly related to mean maximum consumed prey mass among these clades, and this relationship becomes even more significant when phylogeny is taken into account, and support the hypothesis that head shape is adapted to prey size in snakes. Expand
Large size as an antipredator defense in an insect
TLDR
An evolutionary scenario whereby a change in feeding behavior toward vertebrate-toxic plants served as an evolutionary breakthrough, setting in motion the subsequent evolution of increased chemical defense and large body size in lubbers is proposed. Expand
Comparisons of aquatic versus terrestrial predatory strikes in the pitviper, Agkistrodon piscivorus.
TLDR
Pupil behaviour, strike success, strike velocity and acceleration, and prey-capture kinematics in a semi-aquatic pitviper (Agkistrodon piscivorus) when capturing both terrestrial (mice) and aquatic (fish) prey in a standardized laboratory setting are compared. Expand
Functional and ecological correlates of ecologically-based dimorphisms in squamate reptiles.
TLDR
It is predicted that natural selection will act to generate differences in maximum gape, which will translate into differences inmaximum ingestible prey size between the sexes and functional differences in the feeding apparatus of these animals will also be linked with differences in sex-based feeding behavior and with selection of prey. Expand
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