Mi casa es su casa, caterpillar

I saw these house-building caterpillars last week outside of my office at SERC in Edgewater, MD. Anyone know the species? I will rear a few out to adults to figure it out. I'll post here if I can figure it out. Please let me know or post a comment if you recognize it!

UPDATE July 7, 2010: Dean Janiak helped me find it on bugguide.net - It's a bagworm moth, genus Thyridopteryx!

Experimental validation!

In March 2009, maritima published a recommendation for mangrove restorations that Brian Silliman and I wrote about in Ambio. We suggested that mangrove seedlings be planted in high densities clumps to reduce the harsh physical stress (anoxia and high salinity) of the intertidal environment, which can be lethal to mangrove seedlings. Both theory and experiments suggest that mangrove plants, ecosystem engineers that are capable of oxygenating the mucky forest floors of mangrove swamps, would respond well to being planted closer together, where they might facilitate each others' survival (i.e. positive density dependence).

Now, Mark Huxham and colleagues have shown that seedlings do survive better when planted at higher densities in field experiments! Their study appears in the July 12 issue of Philosophical Transactions of the Royal Society B: Biological Sciences. They found higher survival at higher density for the species Rhizophora mucronata at a low intertidal site in Sri Lanka and for the species Avicennia marina at a high intertidal site in Kenya.

Renaissance Keryn

This is not a Renaissance reenactment, but rather my graduation ceremony at Brown University this Memorial Day weekend. It's official...I'm Dr. Gedan.

Tweetable: "Seas the Day!"

On Tuesday night, Jane Lubchenco, marine ecologist and current NOAA Director, gave the 11th Annual Roger Revelle Lecture, sponsored by the National Resource Council Ocean Studies Board to honor namesake Roger Revelle, who discovered that the oceans will not absorb limitless carbon dioxide from fossil fuel burning.

It seems that these days we are increasingly realizing the limits of the ocean, as we approach them from many different angles - the limits of fish harvest, the limits of nutrient transformations and oxygen availability, and the limits of stability of ocean pH, salinity, and temperature. Dr. Lubchenco spoke of these challenges. Local and global solutions, she said, must be pursued simultaneously. Controlling local degradation from nutrient pollution and over-fishing, for example, will help to avoid unpredictable and potentially difficult interactions between local and global stressors and maintain overall system resilience. She ended her lecture hopefully, discussing new approaches to data collection, data synthesis, and environmental regulation that will help us address problems before we reach tipping points and advising us to:

"Seas the Day!"

which is a quote that, if I were a Twitterer, I'd call downright tweetable.

unsung victims of the DC Snowpocalypse

The +2' of snow that hit DC this weekend has surprised and wreaked havoc on many. For example, the federal government, city schools and universities, and many other businesses have been closed over the weekend, Monday, and Tuesday, at a significant economic loss (partially recovered in sales of snow shovels and hot chocolate?). But the unsung victims in this storm, in my opinion, are the Washington street trees.

As the snow started to accumulate on Friday night, I heard a loud *crack* in the courtyard of my building, and saw the first fallen branch. A large branch from an >80 year old tree had smashed another small tree below it. Several other trees in my courtyard also lost large branches, bending and breaking under the weight of 26" of wet snow. Walking the city streets, I saw other casualties.



A few years ago in Providence, RI, they had a tree tally, where volunteers (including me!) identified and counted the street trees for a public record. (There are nearly 25k street trees in Providence, in case you were wondering.) I haven't found such a dataset for DC, although there is a city Urban Forestry Administration. Beyond my anecdotes, it'd be interesting to know the scale of the damage to the city's trees from Snowpocalypse 2010.

winter in the intertidal

I was out in the sub-freezing weather in Rhode Island this weekend to set up succession plots and settlement plates to measure barnacle recruitment, which has already begun! (See a slideshow of last year's recruits here.) There's nothing like seawater freezing on your double-gloved hands to make you feel alive!

I expected the rocky intertidal fauna that had the option to ride out the extreme cold buried in the mud, but I was surprised to see many of the mobile critters out and about during the extreme low tides (-0.5 m or -1.6 ft, nearly 0.5 m lower than the predicted low tide, probably due to wind). Seastars were remarkably abundant, and I also saw a lady crab, Ovalipes ocellatus, a swimming crab that I rarely find in the intertidal (the Kunkel lab at UMass Amherst has a good lady crab photo here).

SEASTAR TRAPPED IN ICE IN THE HIGH INTERTIDAL


BARNACLES ENCASED IN ICE

science the searchlight

I am teaching Environmental Science at American University this spring, and in class today we discussed Aldo Leopold's Sand County Almanac. This quote spoke to me:

"We see repeated the same basic paradoxes: Man the conqueror versus man the biotic citizen; science the sharpener of his sword versus science the searchlight of his universe; land the slave and servant versus land the collective organism."

To me, the concept of "science as sword versus searchlight" pertains to the use of technology to degrade versus restore the environment. However, I think the metaphor also suggests science as a path to enlightenment.

This little light o' mine...I'm gonna let it shine. Let it shine, let it shine, let it shine....