Publications by authors named "B Bethke"
Article Synopsis
- Zebra mussels are invasive species that can change aquatic ecosystems and food webs, potentially increasing mercury levels in fish, yet their impact in inland lakes hadn't been previously studied.
- In Minnesota lakes with zebra mussels, adult walleye and yellow perch showed mercury levels 72% and 157% higher, respectively, compared to lakes without them, with young fish also having elevated mercury concentrations.
- These higher mercury levels in invaded lakes raise concerns for fisheries management and human health, especially since many walleye exceeded safe consumption thresholds more frequently than in uninvaded lakes.
Article Synopsis
- Horses played a crucial role in Indigenous cultures in the American Southwest and Great Plains, but the timeline and methods of their integration remain debated.
- A study analyzing historic horse remains combined genomic, isotopic, and other evidence, revealing strong genetic ties to Iberian horses, with later British influences.
- By the early 17th century, horses were widely adopted in Indigenous societies, impacting herd management, ceremonies, and cultural practices before European observers arrived in the 18th century.
Unstable blood pressure after spinal cord injury (SCI) is not routinely examined but rather predicted by level and completeness of injury (i.e., American Spinal Injury Association Impairment Scale AIS classification).
View Article and Find Full Text PDFBackground: As early as pregnancy, maternal mental stress impinges on the child's development and health. Thus, this may cause enhanced risk for premature birth, lowered fetal growth, and lower fetal birth weight as well as enhanced levels of the stress hormone cortisol and lowered levels of the bonding hormone oxytocin. Maternal stress further reduces maternal sensitivity for the child's needs which impairs the mother-child-interaction and bonding.
View Article and Find Full Text PDFEutrophication and climate warming are profoundly affecting fish in many freshwater lakes. Understanding the specific effects of these stressors is critical for development of effective adaptation and remediation strategies for conserving fish populations in a changing environment. Ecological niche models that incorporated the individual effects of nutrient concentration and climate were developed for 25 species of fish sampled in standard gillnet surveys from 1,577 Minnesota lakes.
View Article and Find Full Text PDF