Category Archives: Gallery

Artificial leaf loaves

Or artificial loaves of leaves, Jessica, another undergraduate student working in my lab, is investigating leaf pack dynamics in an Ohio stream.  She has characterized leaf accumulation in the field, and, unfortunately, seen the rapid washing of her samples during a mild flooding event.  The next step is to characterize a few variables that may be important in leaf packs within streams (i.e., invertebrate community succession and FPOM accumulation) using artificially constructed leaf packs… or loaves.  Below, leaves where pierced onto a kabob with the help of a couple of volunteers.

Jessica's Loaf construction - 12.04.2010 - 11.43.08
Kabobs
Jessica's Loaf construction - 12.04.2010 - 11.44.49
Jessica rinses leaves
Jessica's Loaf construction - 12.04.2010 - 11.45.55 Jessica's Loaf construction - 12.04.2010 - 11.45.58
Jessica's Loaf construction - 12.04.2010 - 11.46.25
Ariel, Scott and Mauri construct leaf kabobs
Jessica's Loaf construction - 12.04.2010 - 13.22.26
Some finished leaf loaves

Peter’s Winter Project

Peter, an undergraduate student in my lab, is interested in winter ecology – a little studied field that is more or less assumed to be of limited relevance in temperate systems, at least in comparison to warmer seasons.  In the winter, ecosystem and community functions slow or stop all together.  For example, primary productivity halts in deciduous trees, yet likely still occurs in microorganisms, and invertebrate community interactions (i.e., predation) are simply slowed due to an overall decrease in metabolic rates.  Of the multitude of processes or interactions open to investigation, Peter decided to assess decomposition dynamics of leaf litter under the snow, and address effects of snowfall on these dynamics.  To do so, five blocks with three treatment plots each were marked and sampled by removing subsamples of leaf biomass from each of the three treatment plots within blocks.  Within each block, snow from one treatment plot was removed and added to another, so that there was a treatment plot with ambient snowfall, snowfall removed, and snowfall added.  Now, if we could only find enough freezer space…

Peter Euclide's winter decomposition - 12.22.2010 - 11.06.59-1
Peter points out a potential area to set up a block
Peter Euclide's winter decomposition - 12.22.2010 - 12.13.46-1
An added- and a removed- snow cover plot
Peter Euclide's winter decomposition - 12.22.2010 - 12.14.32-1
Chris and Peter survey the finished block

Peter Euclide's winter decomposition - 12.22.2010 - 11.54.11-1
Tools of the trade

Peter Euclide's winter decomposition - 12.22.2010 - 13.37.05-1
A sampling area - leaf material was removed from beneath the snow
Peter Euclide's winter decomposition - 12.22.2010 - 13.37.29-1
Three subsamples cleared of leaf material
Peter Euclide's winter decomposition - 12.22.2010 - 13.37.51-1
Chris surveys for the next subsample to process
Peter Euclide's winter decomposition - 12.22.2010 - 13.38.11
Snow is carefully excised
Peter Euclide's winter decomposition - 12.22.2010 - 13.38.18-1
All in one shot

Peter Euclide's winter decomposition - 12.22.2010 - 14.13.14-1
Sometimes, not all the snow is removed in one shot... this leads to cold hands, since only rubber gloves were used

Peter Euclide's winter decomposition - 12.22.2010 - 14.13.37-1
Peter cuts a cake of snow