| distribution, abundance, and genetic diversity of clinostomum spp. metacercariae (trematoda: digenea) in a modified ozark stream system. | abstract land-use alterations can have profound influences on faunal distributions, including host-parasite relationships. yellow grub trematodes ( clinostomum spp.) have complex life cycles involving 3 hosts: a snail, a fish or amphibian, and a bird. here, we analyze the distribution, prevalence, intensity, abundance, and genetic diversity of encysting metacercariae of clinostomum spp. in salamanders and fishes throughout an aquatic system that includes a natural ozark stream and man-made ponds ... | 2011 | 21506775 |
| the lack of nasolacrimal ducts in plethodontid salamanders? | nasolacrimal ducts are a terrestrial vertebrate adaptation and appear to have co-evolved with orbital glands. although plethodontid salamanders possess orbital glands, a recent study concluded that plethodontid salamanders lack nasolacrimal ducts. functionally, the absence of nasolacrimal ducts closes the route for orbital gland secretion passage into the nasal and vomeronasal organ cavities. orbital glands have been implicated in enhancement of vomeronasal function so loss could have important ... | 2017 | 29283508 |
| reduced effects of thyroid hormone on gene expression and metamorphosis in a paedomorphic plethodontid salamander. | it has been over a century since gudernatsch (1912, wilhelm roux arch entwickl mech org 35:457-483) demonstrated that mammalian thyroid gland extracts can stimulate tadpole metamorphosis. despite the tremendous developmental diversity of amphibians, mechanisms of metamorphosis have mostly been studied in a few model systems. this limits our understanding of the processes that influence the evolution of developmental aberrations. here we isolated thyroid hormone receptors alpha (trĪ±) and beta (tr ... | 2014 | 24890624 |
| streambed microstructure predicts evolution of development and life history mode in the plethodontid salamander eurycea tynerensis. | habitat variation strongly influences the evolution of developmentally flexible traits, and may drive speciation and diversification. the plethodontid salamander eurycea tynerensis is endemic to the geologically diverse ozark plateau of south-central north america, and comprises both strictly aquatic paedomorphic populations (achieving reproductive maturity while remaining in the larval form) and more terrestrial metamorphic populations. the switch between developmental modes has occurred many t ... | 2006 | 16512919 |
| multiple stressors produce differential transcriptomic patterns in a stream-dwelling salamander. | global biodiversity is decreasing at an alarming rate and amphibians are at the forefront of this crisis. understanding the factors that negatively impact amphibian populations and effectively monitoring their health are fundamental to addressing this epidemic. plasma glucocorticoids are often used to assess stress in amphibians and other vertebrates, but these hormones can be extremely dynamic and impractical to quantify in small organisms. transcriptomic responses to stress hormones in amphibi ... | 2019 | 31185901 |