Lake whitefish (Coregonus clupeaformis) were fed rainbow smelt (Osmerus mordax) in four laboratory tanks over a 133-d experiment. At the start of the experiment, 10 to 14 of the fish in each tank were sacrificed, and the concentrations of 40 polychlorinated biphenyl (PCB) congeners within these fish were determined. Polychlorinated biphenyl congener concentrations were also determined in the 15 lake whitefish remaining in each of the four tanks at the end of the experiment as well as in the rainbow smelt fed to the lake whitefish. Each lake whitefish was weighed at the start and the end of the experiment, and the amount of food eaten by the lake whitefish during the experiment was tracked. Using these measurements, net trophic transfer efficiency (gamma) from the rainbow smelt to the lake whitefish in each of the four tanks was calculated for each of the 40 PCB congeners. Results showed that gamma decreased exponentially as log K(OW) for the congeners increased from 6 to 8. Further, gamma averaged 0.70 for the tetrachloro congeners but averaged only 0.45 for the higher chlorinated congeners.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1897/07-274.1 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Widespread admixture blurs population structure and confounds Lake Trout (Salvelinus namaycush) conservation even in the genomic era.
Sci Rep
December 2024
Department of Biology, Concordia University, 7141 Sherbrooke St. West, Montreal, QC, H4B 1R6, Canada.
Intraspecific variation is important for species' long-term persistence in changing environments. Conservation strategies targeting intraspecific variation often rely on the identification of management or policy units below the species level based on biological differences among populations. To identify management units, this paper examines intraspecific divergence of Lake Trout (Salvelinus namaycush) in Great Slave Lake (GSL), Canada, using low-coverage whole-genome sequencing data.
View Article and Find Full Text PDFComplex and Dynamic Gene-by-Age and Gene-by-Environment Interactions Underlie Functional Morphological Variation in Adaptive Divergence in Arctic Charr (Salvelinus alpinus).
Evol Dev
March 2025
Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada.
The evolution of adaptive phenotypic divergence requires heritable genetic variation. However, it is underappreciated that trait heritability is molded by developmental processes interacting with the environment. We hypothesized that the genetic architecture of divergent functional traits was dependent on age and foraging environment.
View Article and Find Full Text PDFPsychoactive pollutant alters movement dynamics of fish in a natural lake system.
Proc Biol Sci
December 2024
Department of Wildlife, Fish, and Environmental Studies, Swedish University of Agricultural Sciences, Umeå 907 36, Sweden.
Pharmaceutical pollution poses an increasing threat to global wildlife populations. Psychoactive pharmaceutical pollutants (e.g.
View Article and Find Full Text PDFParaxanthine enhances memory and neuroplasticity more than caffeine in rats.
Exp Brain Res
December 2024
Radiant Research Services Pvt. Ltd, Bangalore, 560058, India.
Article Synopsis
- Paraxanthine (PXN), the main metabolite of caffeine, has been found to enhance cognition, memory, and attention in various studies, but there hasn't been a direct comparison with caffeine (CAF) in preclinical settings.
- This study aimed to analyze the effects of different doses of PXN and CAF on memory and related brain biomarkers in young and aged rats using tests that measure cognition and neurotransmitter levels.
- Results indicated that PXN, particularly at higher doses, outperformed CAF in improving escape latency and increasing BDNF levels, suggesting that PXN may be a more effective nootropic than caffeine.
Labeled images of emerged salmonids in a riverine environment.
BMC Res Notes
November 2024
Great Lakes Fishery Commission, Ann Arbor, MI, USA.
Objectives: These data enable the development of machine learned models to detect unintended passage of salmonids over in-stream barriers. Such models are key to fully characterizing the effectiveness of selective passage systems, as they detect and quantify fish passage which occurs outside of the intended transit passage and selection mechanism. These data were used to construct custom surveillance tools for FishPass ( https://www.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!