BISHOP, K.L.; Brown University: A physical modelling approach for determining the effect of shape on the aerodynamic forces generated by a flexible wing. Although it is generally accepted that bats evolved from arboreal gliders, there is an implicit assumption in the literature that gliding and flapping flight represent two separate adaptive zones. It is also […]
year: 2003
A morphological description of the nervous system of Bipes biporus
THOMSON, M.J.; MOUSTAKAS, J.E.; University of California; University of California: A morphological description of the nervous system of Bipes biporus Bipes biporus is a basal member of a group of highly specialized fossorial squamates called amphisbaenians. We describe the morphology of the nervous system of Bipes biporus using an antibody to acetylated alpha-tubulin, which recognizes […]
A lift-based mechanism for foot-propelled diving in cormorants (Phalacrocoracidae)
JOHANSSON, L. Christoffer; G�teborg University: A lift-based mechanism for foot-propelled diving in cormorants (Phalacrocoracidae)? To examine the hydrodynamic propulsion mechanism of a diving great cormorant (Phalacrocorax carbo), the kinematics was determined by digital analysis of sequential video images of the lateral view. During the acceleration phase of this foot-propelled bird, the feet move through an […]
A Test of the Dear Enemy Effect in the Strawberry Dart-poison Frog (Dendrobates pumilio)
BEE, M. A.; Carl von Ossietzky Universit�t, Oldenburg: A Test of the Dear Enemy Effect in the Strawberry Dart-poison Frog (Dendrobates pumilio) Territorial animals commonly exhibit lower levels of aggression toward familiar neighbors in their usual territories than toward non-territorial “strangers”. This form of social recognition, termed the “dear enemy effect” or “neighbor recognition” is […]
A Morphometric Shape Analysis of Phenotypic Plasticity in Plains Spadefoot Toad (Spea bombifrons) Tadpoles
OLSON, Christopher; FARRAR, Eugenia; ADAMS, Dean; Iowa St. Univ.; Iowa St. Univ.; Iowa St. Univ.: A Morphometric Shape Analysis of Phenotypic Plasticity in Plains Spadefoot Toad (Spea bombifrons) Tadpoles Phenotypic plasticity may enable organisms to cope with unpredictable environments and resource availability. The feeding morphology and trophic niche of spadefoot toad (Spea bombifrons) larva is […]
Trochophora larvae and animal phylogeny
NIELSEN, C.; Zoological Museum, Copenhagen, Denmark: Trochophora larvae and animal phylogeny The trochophore has been a central concept in speculations on metazoan evolution for more than a century. Hatschek summarized the more or less scattered observations on ciliated marine larvae over several decades and of his own observations, especially of the larvae of Polygordius and […]
The search for evolutionary developmental mechanisms
HALL, B. K.; Dalhousie Univ.: The search for evolutionary developmental mechanisms. I am grateful for the honor bestowed by the St Petersburg Soc. of Naturalist with the awarding of an Alexander Kowalevsky Medal. Initially, I will outline the contributions to evolutionary embryology/morphology made by Kowalevsky, especially how his research opened up an entirely new theory […]
The Evolutionary Significance of Early Development
FREEMAN, G.; Univ. Texas: The Evolutionary Significance of Early Development Many features of the body plans of animal phyla are blocked out during early development even though additional body plan altering events can occur later during development of animals with complex life cycles. These developmental periods are frequently referred to as ‘phylotypic stages’; this isa […]
THE RE-ESTABLISHMENT of the A O KOWALEVSKY MEDAL
GILBERT, S. F.; MIKHAILOV, A. T.; Swarthmore College, Swarthmore, PA; University of La Coru�a, Spain: THE RE-ESTABLISHMENT of the A. O. KOWALEVSKY MEDAL The St. Petersburg Society of Naturalists has reinstated the Alexander O. Kowalevsky Medal for Evolutionary and Comparative Embryology. This medal was instituted in 1910, but it had not been awarded until 2001. […]
Rupert Riedl and the re-synthesis of Development and Evolution
WAGNER, G.; Yale Univ, New Haven: Rupert Riedl and the re-synthesis of Development and Evolution The professional work of Rupert Riedl covers a lot of ground, spanning from comparative invertebrate anatomy and systematics to marine ecology, to evolutionary theory and philosophy of science as well as environmental ethics. In the context of this symposium the […]
