A Chemoautotrophically Based Cave Ecosystem
Analysis of stable carbon and nitrogen isotopes showed that this chemoautotrophic production is the food base for 48 species of cave-adapted terrestrial and aquatic invertebrates, 33 of which are endemic to this ecosystem.
Adaptation and Natural Selection in Caves: The Evolution of Gammarus minus
This chapter discusses caves as Evolutionary Laboratories, Gammarus minus as a Model Organism, and Adaptation in Gammaru minus.
Vestigialization and Loss of Nonfunctional Characters
Reduction and total loss of characters are common evolutionary phenomena and most explanations of evolutionary reductions invoke indirect selection through energy economy or antagonistic pleiotropy arguments, while some invoke the effects of accumulation of neutral mutations.
Productivity-Diversity Relationships from Chemolithoautotrophically Based Sulfidic Karst Systems
The discovery of diverse communities at deep-sea hydrothermal vents and cold seeps brought to light the importance of microorganisms as significant contributors to ecosystem autotrophic processes.
Ecological Assessment and Geological Significance of Microbial Communities from Cesspool Cave, Virginia
The carbon to nitrogen ratios of the microbial mats averaged 13.5, indicating that the mats are not a high quality food source for higher trophic levels, and Ribosomal RNA-based methods were used to examine bacterial diversity in the microbial mat, revealing the presence of at least five strains of bacteria.
GENETIC STRUCTURE OF MORPHOLOGICALLY DIFFERENTIATED POPULATIONS OF THE AMPHIPOD GAMMARUS MINUS
Findings from a cladistic measure of gene flow inferred from the phylogenies of alleles suggest that mitochondrial DNA diversity in the sea urchins Strongylocentrotus purpuratus and S. droebachiensis is limited by the finite island model.
Adaptation and Natural Selection in Caves
It was found that area alone was the best predictor of species richness, suggesting that increased area acts primarily to reduce extinction rates rather than to provide new habitats for specialized species.
ARE PARALLEL MORPHOLOGIES OF CAVE ORGANISMS THE RESULT OF SIMILAR SELECTION PRESSURES?
- Ross Jones, D. Culver, T. C. Kane
- Biology, Environmental ScienceEvolution; international journal of organic…
- 1 April 1992
This study used variation in mating success and fecundity to test for the presence of directional selection on eye, antennal, and body size characters in a set of cave and spring populations during a series of seasonal cross‐sectional samplings and found significant directional selection for smaller eyes in caves and larger eyes in springs, which supports the hypothesis that selection is responsible for reduced eye size in cave populations.
Microbiological characterization of a sulfide‐rich groundwater ecosystem
It is proposed that the Movile Cave community is biologically isolated and receives little, if any, organic carbon inputs from the surface environment.