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Articles 31 - 34 of 34
Full-Text Articles in Biology
Metacommunity Patterns In Larval Odonates, Shannon J. Mccauley, Christopher J. Davis, Rick A. Relyea, Kerry L. Yurewicz, David K. Skelly, Earl E. Werner
Metacommunity Patterns In Larval Odonates, Shannon J. Mccauley, Christopher J. Davis, Rick A. Relyea, Kerry L. Yurewicz, David K. Skelly, Earl E. Werner
Biological Sciences
The growth of metacommunity ecology as a subdiscipline has increased interest in how processes at different spatial scales structure communities. However, there is still a significant knowledge gap with respect to relating the action of niche-and dispersal-assembly mechanisms to observed species distributions across gradients. Surveys of the larval dragonfly community (Odonata: Anisoptera) in 57 lakes and ponds in southeast Michigan were used to evaluate hypotheses about the processes regulating community structure in this system. We considered the roles of both niche- and dispersal-assembly processes in determining patterns of species richness and composition across a habitat gradient involving changes in the …
Predator Induction Of Spine Length In Larval Leucorrhinia Intacta (Odonata), Shannon Mccauley, Christopher J. Davis, Earl E. Werner
Predator Induction Of Spine Length In Larval Leucorrhinia Intacta (Odonata), Shannon Mccauley, Christopher J. Davis, Earl E. Werner
Biological Sciences
Questions: Do larvae of a dragonfly with a broad habitat distribution have longer abdominal spines when they co-exist with fish, and are these differences the result of phenotypic plasticity?
Hypothesis: Phenotypic plasticity will result in larvae having longer spines when they are exposed to cues from predatory fish.
Organism: Larvae of Leucorrhinia intacta (Odonata: Libellulidae).
Research site: Natural ponds and cattle tanks on the E.S. George Reserve in southeast Michigan.
Methods: We compared the morphology of larvae collected from two natural ponds before and after a drought resulted in the extirpation of fish from one pond. We also compared …
The Phenotypic Plasticity Of Death Valley's Pupfish: Desert Fish Are Revealing How The Environment Alters Development To Modify Body Shape And Behavior, Sean C. Lema
Biological Sciences
Death Valley seems an unlikely spot to go fishing. Nonetheless, seven species of pupfish survive in North America's lowest, hottest spot as remnants from the cooler, damper Pleistocene Epoch. For the most part, these species exist in isolation and have been left to adapt to minute details of their local environment—sort of the fish version of Darwin's finches. Surprisingly, however, even within a species, when environmental variables such as water temperature or food supply vary, morphological changes are evident within a few generations. This phenotypic plasticity calls into question not only environmental management practices for species preservation but also just …
Franklin's Electric Kite Experiment, William D. Stansfield
Franklin's Electric Kite Experiment, William D. Stansfield
Biological Sciences
No abstract provided.