Loglet Lab Update

Loglet Lab is experiencing some difficulties and you may receive errors on the more complex analysis. We apologize for the inconvenience and are working to alleviate the problems. Meanwhile Loglet lab version 5 is under development and will be available as soon as possible. Stay tuned.

eDNA work in progress

We post a Schematic of an eDNA metabarcoding protocol for marine fish.

We recently showed that current laboratory protocols optimize sensitivity and reproducibility, especially for more abundant fish populations (ICES J Mar Sci 2022). eDNA metabarcoding is generally considered a qualitative tool for relative abundance. We hope to help develop eDNA metabarcoding as a quantitative tool for absolute abundance (link to pdf work-in-progress).

eDNA Detection of Salamanders

PHE student Samara Davis will present her work with Mark Stoeckle on eDNA detection of threatened salamanders at Northeast Partners in Amphibian and Reptile Conservation Annual Meeting http://northeastparc.org, to be held in West Virginia in August.

eDNA degradation; 2nd National Workshop

PHE’s guest investigator David Thaler offers some stimulating ideas in a memo about ways of understanding and learning from degradation of aquatic eDNA. The title: How long has each particular species’ eDNA been outside the organism from which it came? Some thoughts on the possibility to obtain more information from eDNA analysis of water samples

Meanwhile, Jesse Ausubel and Mark Stoeckle are involved in the program for the 2nd US National Workshop on eDNA, 12-15 September in Southern California. PHE hosted the 1st US national meeting in 2018.

PHE eDNA student project a finalist in 2022 Genius Olympiad

Samara Davis’s salamander eDNA project is a finalist in 2022 Genius Olympiad.  Genius Olympiad is an international high school project competition about environmental issues founded and organized by Terra Science and Education and hosted by the Rochester Institute of Technology. The Olympiad will host projects in five general disciplines with an environmental focus.  

Call for Global Library of Underwater Biological Sounds

A paper by the Working Group on Acoustic Measurement of Ocean Biodiversity Hotspots of the International Quiet Ocean Experiment (IQOE) published “Sounding the Call for a Global Library of Biological Underwater Sounds” in the journal “Frontiers in Ecology and Evolution.”   Congratulations to Miles Parsons, Aran Mooney, Lucia di Iorio and company on a landmark contribution, which should become a major acoustic goal of the UN Decade of Ocean Science for Sustainable Development.

Terry Collins’ press release contains a superb description of the paper as well as snippets of sound from a toadfish, piranha, gurnard fish, sea urchin, crab, and whale and information about 14 sound libraries.

The Guardian, United Kingdom Fish love songs and fighting talk: underwater sound library to reveal language of the deep

El Mundo, Madrid, La ‘biblioteca’ de los sonidos submarinos: los científicos graban el coro natural de los habitantes del océano

Popular Science, Why ocean researchers want to create a global library of undersea sounds

Airborne DNA

PHE’s marine eDNA expert Mark Stoeckle comments on new papers on airborne eDNA in the video Scientists ID Dozens of Plants, Animals from Free-Floating DNA. In a trio of studies, researchers report capturing and analyzing airborne prepared for the magazine and website The Scientist.  The report is spurred by widely reported terrific new papers measuring airborne DNA around zoos.

While presented as a first, this study of airborne DNA began in 2005 under the auspices of the Alfred P. Sloan Foundation. Paula Olsiewski and Jesse Ausubel recruited and managed a series of grants to explore the potential for airborne DNA studies. The largest grant went to the Venter Institute, which pioneered the techniques:

After Mapping the Human Genome, Analyzing the City’s Air Mar 7, 2005 — Dr J Craig Venter will study New York City’s air by installing filter system atop one of Midtown-Manhattan’s skyscrapers and studying its …  

  Among resulting publications: A metagenomic framework for the study of airborne microbial communities  …, J Glass, MD Adams, R Friedman, JC Venter – PloS one, 2013 – journals.plos.org  Understanding the microbial content of the air has important scientific, health, and economic  implications. While studies have primarily characterized the taxonomic content of air samples by sequencing the 16S or 18S ribosomal RNA gene, direct analysis of the genomic …

Among other findings, while focusing on microbial aspects, the Venter team found more rat DNA circulating in the air of NY than human DNA.