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Full-Text Articles in Life Sciences
Professor Bruce Criley To Retire, Rachel Hatch
Crileys Reflect On Years With Illinois Wesleyan, Rachel Hatch
Crileys Reflect On Years With Illinois Wesleyan, Rachel Hatch
News and Events
No abstract provided.
Loss Of ‘Bio-Guards’ Endangering Humans Says Professor, Rachel Hatch
Loss Of ‘Bio-Guards’ Endangering Humans Says Professor, Rachel Hatch
News and Events
No abstract provided.
Why Are Incubation Periods Longer In The Tropics? A Common-Garden Experiment With House Wrens Reveals It Is All In The Egg, Given Harper, W. Robinson, John Styrsky, Brian Payne, Charles Thompson
Why Are Incubation Periods Longer In The Tropics? A Common-Garden Experiment With House Wrens Reveals It Is All In The Egg, Given Harper, W. Robinson, John Styrsky, Brian Payne, Charles Thompson
Scholarship
Incubation periods of Neotropical birds are often longer than those of related species at temperate latitudes. We conducted a common-garden experiment to test the hypothesis that longer tropical incubation periods result from longer embryo development times rather than from different patterns of parental incubation behavior. House wrens, one of few species whose geographic range includes tropical equatorial and temperate high latitudes, have incubation periods averaging 1.2 days longer at tropical latitudes. We incubated eggs of house wrens in Illinois and Panama under identical conditions in mechanical incubators. Even after factoring out differences in egg size, tropical house wrens still required …
Organochlorine Pesticide Contamination And Its Potential Effects On Eggshell Characteristics Of Dickcissels (Spiza Americana), Bridget Wall '08
Organochlorine Pesticide Contamination And Its Potential Effects On Eggshell Characteristics Of Dickcissels (Spiza Americana), Bridget Wall '08
Honors Projects
Dickcissels (Spiza americana) are small, sparrow-like songbirds that nest in grasslands in the U.S. and winter in Venezuela. Fanners in Venezuela intentionally spray dickcissel flocks with organochlorine (DC) and other illegal pesticides in an attempt to kill them when they feed in both rice and sorghum fields. Previous studies have shown that organochlorine (DC) pesticide' contaminants (e.g., DDT) have significantly reduced eggshell thickness in eagles and falcons.. Although DDT was banned in the United States more than twenty years ago, DC compounds and their metabolites still persist in wildlife, possibly resulting in reduced reproductive success and in disrupted endocrine systems …
Distribution Of Bipinnaria And Pilidium In Relation To Physical Structure And Uv-B Light In The Water Column Off Anvers Island, Antarctica, William Jaeckle
Distribution Of Bipinnaria And Pilidium In Relation To Physical Structure And Uv-B Light In The Water Column Off Anvers Island, Antarctica, William Jaeckle
Scholarship
Feeding larvae of Antarctic bottom invertebrates have proven to be scarce in the plankton and consequently our knowledge of their ecology is limited. We collected bipinnaria larvae assignable to the genus Odontaster and several types of pilidium larvae of nemertean worms in quantitative net tows taken during the austral spring and summer 1997-1998 and considered their distribution with respect to the density stratification of the water column and the potential exposure to UV-B (λ = 308 nm). The average number of pilidium and bipinnaria larvae in the upper 40 m of the water column was 0.5 ± 1.0 per m3 …
Coelomogenesis And Nutrition Of Clonally Produced Asteroid Larvae, William Jaeckle
Coelomogenesis And Nutrition Of Clonally Produced Asteroid Larvae, William Jaeckle
Scholarship
Asexual reproduction by planktotrophic larvae of asteroids is an unusual life history strategy exhibited by several species in the families Luididae, Oreasteridae, Ophidiasteridae, and Asteriidae. Larvae of the former three families reproduce asexually in the field, while the asteriid Pisaster ochraceus has produced clones when larvae are reared in the laboratory. Our knowledge of the processes involved in larval cloning and the biology of the developing clone is fragmentary in nature. We used light, electron, and scanning laser confocal microscopy to study clones that develop through paratomy of the posterolateral larval arms. The archenteron forms by a modified form of …
Coelomogenesis And Nutrition Of Clonally Produced Asteroid Larvae, William Jaeckle
Coelomogenesis And Nutrition Of Clonally Produced Asteroid Larvae, William Jaeckle
William Jaeckle
Asexual reproduction by planktotrophic larvae of asteroids is an unusual life history strategy exhibited by several species in the families Luididae, Oreasteridae, Ophidiasteridae, and Asteriidae. Larvae of the former three families reproduce asexually in the field, while the asteriid Pisaster ochraceus has produced clones when larvae are reared in the laboratory. Our knowledge of the processes involved in larval cloning and the biology of the developing clone is fragmentary in nature. We used light, electron, and scanning laser confocal microscopy to study clones that develop through paratomy of the posterolateral larval arms. The archenteron forms by a modified form of …