Speckled dace (Rhinichthys osculus) is a small cyprinid that is geographically widespread throughout western North America, and the most frequently occurring sh in Oregon. Because of the genetic and morphological variation in this species across its range, it has been referred to as a "species complex" and no revision to...
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AN ABSTRACT OF THE THESIS OF
Kendra L. Hoekzema for the
Chilodontidae is a small family of eight described characiform species popularly
known as headstanders. These small to moderately sized fishes are well known to
aquarists, who prize their striking spotted pigmentation and unusual behaviors, and to
systematists, who have revised both chilodontid genera in recent memory and studied
their phylogenetic...
The Speckled dace (Rhinichthys osculus) is the most widespread minnow in western North America (Gilbert and Williams, 2002). It has diversified widely across its range—both morphologically and genetically—and as such might rightly be called a species complex. Our ongoing work aims to determine where boundaries between potentially undescribed species lie...
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Morphometrics
Photo of Foskett dace, courtesy of K. Hoekzema
*Note: size-adjusted
Results: Stream vs
The Speckled dace (Rhinichthys osculus) is the most widespread minnow in western North America (Gilbert and Williams, 2002). It has diversified widely across its range—both morphologically and genetically—and as such might rightly be called a species complex. Our ongoing work aims to determine where boundaries between potentially undescribed species lie...
Full Text:
of K. Hoekzema
*Note: size-adjusted
These are the different measurements that I did. I size
The interplay of natural selection and genetic drift, influenced by geographic isolation, mating systems and population size, determines patterns of genetic diversity within species. The sperm whale provides an interesting example of a long-lived species with few geographic barriers to dispersal. Worldwide mtDNA diversity is relatively low, but highly structured...
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.001 T T C C A G C C T T A A C A T G A A C C A A G T A G C A G C C T A G
K .NA .NA T T T C A G C C T
The interplay of natural selection and genetic drift, influenced by geographic isolation, mating systems and population size, determines patterns of genetic diversity within species. The sperm whale provides an interesting example of a long-lived species with few geographic barriers to dispersal. Worldwide mtDNA diversity is relatively low, but highly structured...
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,*† KENDRA HOEKZEMA,† SARAH L. MESNICK,§
DANIEL ENGELHAUPT,¶ IAIN KERR,** ROGER PAYNE** and C. SCOTT BAKER
Large population sizes and global distributions generally associate with high mitochondrial DNA control region (CR) diversity. The sperm whale (Physeter macrocephalus) is an exception, showing low CR diversity relative to other cetaceans; however, diversity levels throughout the remainder of the sperm whale mitogenome are unknown. We sequenced 20 mitogenomes from...
Neotropical characiform fishes form one of the most diverse freshwater ichthyofauna in the world. Knowledge of evolutionary processes that generated and maintain the immense characiform lineage and morphological diversity is still poorly understood. When did characiform lineages diversify? How have major geological and environmental changes affected diversification? Why are some...