We created this blog to have a space we can use to keep an informal progress report on the field work the Lab is doing in the Sonoran Desert. It's a way to share updates on weather, conditions, and stories coming out of the field.
Wednesday, April 20, 2011
Red Team - April 7-14
For those of you who finished up early, a quick little update on field work in the beginning of April. Most of the cactus seemed to bloom on the week off around Gila Bend, but there were more annuals up than the week before. While Sarah and I had been wary of the impending heat, we lucked out with rain and quite a cold snap. We were not so lucky however when it came to tires - 3 flats. Hawk and the rest of the gang at the tire shop say, "Hello!"
Friday, April 1, 2011
It's a dissertation!
As Aaryn proudly presented his baby Kent in the previous post, I am finally presenting my baby dissertation "FOREST DIVERSITY AND CONSERVATION IN THE WESTERN AMAZON BASED ON TREE INVENTORY AND REMOTE SENSING DATA" here. It's the longest paper I've ever written (355 pages). The complete draft of this dissertation can be downloaded from here. I'm defending in three weeks and will upload the final version of this baby to share.
Ophelia
Wednesday, March 23, 2011
a sensei-tional week
The first thing we did was put them to work, clipping our extensive fields of biomass.
They also carried their own instruments.
We discovered a new bio-control agent for Sahara mustard.
The undocumented workers christened Susan as the legendary Poncho Villa.
After hours, we got all cleaned up and ready to hit the hoppin' mecca of Quartzsite.
Thanks, Steve and Jill, for a rockin' good time! And next time you see Jill, be sure to ask her about her close encounter at Quartzsite's Reader's Oasis bookstore.
Sunday, March 20, 2011
Friday, March 18, 2011
A Landscape of Juxtoposition
Friday, March 11, 2011
It's a boy!
Ok, so we knew that already, but it seemed like an appropriate title.
Wednesday, March 9, 2011
Red Team - Snow and Motor Cross
As for the actual field work last trip, we were joined over the weekend by Sasha, clipper extraordinaire.
The three of us got to work in a less disturbed area which was a treat for us all, but the dust storm made the plots a little harrowing. Its only a few miles to the mountains in the 2nd photo. You could fly a kite, but you couldn't see it (the weather according to a gas station man).
The snow on the mountains the next day however was worth the scratched cornea Julie got. Saturday we also found our first Desert Tortoises--yes, plural, but also dead. Still it was interesting to see the carapaces and wonder what got them in the end.
Things remained interesting along the border. We worked in Cabeza Prieta Refuge one day and were promptly checked out by a helicopter hovering 100 ft from us and 20 ft off the ground. Guess the black garbage bag Sarah was carrying didn't look full enough to be problematic. While there Sarah was able to realize the her dream of a shorts plot.
The highlight however was on Thursday morning when a team of 5-7 BP on dirt bikes came zooming into our plot (sorry no pics) followed 2 minutes later by a lone dirt bike that died 50 ft East of our subplot and then 50 ft North of our subplot. Alvarez told us they were tracking a group of 12 UDAs through the area, and he knew about buffle grass!
We are featured in Inside NAU, a publication of the Office of Public Affairs
Tuesday, March 8, 2011
Cave research in the Atacama Desert in Chile
Jut Wynne, Ph.D. candidate of LLECB, has been conducting cave conservation and management research in the Atacama Desert in northern Chile.
Check out the gorgeous landscape and Tucúquere (Bubo magellanicus) from a small cave in Canyon Cartarpe on their first day:
Thursday, March 3, 2011
Home on the range...
Walt and I just got outta our week at YPG and Kofa NWR. We had a good trip, got nine plots done, spent a day with Luke, and saw some awesome country. The roads are mostly terrible, but that seems to be an aspect of this job that is hard to avoid. The botanizing was fun at times; better than south of I-8 on the BMGR which was just alota creosote and plantago. I'd like to share some thoughts regarding fire, invasives, and their ecology in the Sonoran desert. These notes are merely my personal observations and interpretation, and I'd appreciate peoples feedback and critique. This aspect of this project can be useful to all of us as naturalists in this ecosystem, and a valuable qualitative context for the lab crew who will see lotsa numbers but have too few days in the field observing the pretty neat patterns and processes out there in the 'real world'. Thanks, please add comments and/or new posts to build on these thoughts.
Soil types (which are directly related to geologic parent material and landscape position) have a pretty strong effect on fine fuels variables (species presence, abundance, condition, plant height, density, etc).
Valley-fill alluvium composed of decomposed granite and sand thus far has the most dense, continuous cover of low annuals (mostly Plantago ovata). These are the soils encountered in much of BMGR. Valley-fill alluvium of decomposed rhyolite, andesite, and other granitic volcanics seems to support a less continuous cover of annuals, but a more diverse assemblage. Desert pavement, generally composed of basalts, tuffs, and other volcanics are harsh environments and have the lowest cover, richness, fuel continuity, etc. Within the desert pavement, isolated patches of disturbed soils (directly linked to rodent, rabbit, and canid borrowing) offer refugia for annual plants, and are often colonized by native annuals and Schizmus barbatus. Also, within the desert pavement, linear erosional features offer similar conditions. Hillside soils, composed of volcanic rocks, bedrock, and gravel offer little space for plant colonization and thus far seem to be composed mostly of native annuals, especially our unknown ‘AST001’ which this week I confirmed as Calycoseris wrightii, as well as Eriogonum trichopes, which is abundant and widespread in desert pavement, seldom encountered in alluvium of volcanic origin, and almost nonexistent in decomposed granite alluvium.
Ocular estimation of fine fuel importance, based on general patterns observed (data will probably match this pretty well); from top to bottom the most important species in contribution to fine fuels:
1) Plantago ovata
2) Amsinckia intermedia
3) Eriogonum trichopes
4) Cryptantha & Pectocarya spp.
5) Lepidium lasiocarpum & Lepidium spp.
6) Schizmus barbatus
7) Native Brassicaceae spp.
8) Buffelgrass (mostly observed in roadside ditches and scattered in washes)
9) Brassica tournefortii
10) all others
*the contribution of native shrubs to fire activity cannot be overlooked, especially Ambrosia spp in the creosote valleys (drought-deciduous plants are very dry right now), and a wide range of shrubs in the upper Sonoran where the vegetation appears to be generally denser. Also, throughout the desert pavement areas, shrubs offer soil enrichment & microclimatic conditions that allow fine fuels to establish beneath them. I think the data will show this to a degree.
We have observed past fire evidence almost everywhere we have been. I am a keen observer of fires effects on forest and woodland structure and have applied my understanding of these systems to the Sonoran communities we’ve been in. The more obvious evidence we have seen includes recently killed shrubs (sometimes just charred micro-stumps persist, and sometimes, especially with creosote, the leafless skeleton persists), charred and fallen trees (mostly palo-verde & ironwood, which appear to have virtually no tolerance of fire), fire-scarred saguaro, and in the McDowell Mtn area, absolute devastation of most cacti, especially chainfruit cholla, buckhorn cholla, and Christmas cholla. The more subtle evidence consists of stand structural characteristics like saguaro age-class distribution, ocotillo that appear to be stump sprouts (does this species sprout following fire??), shrub re-sprouting (brittlebush, jojoba, and Celtis pallida respond favorably to fire, showing rapid re-growth and generally larger height attainment), and annual forb canopy continuity (only at McDowell Mtn Park did we see an obvious dominance of Schizmus in burnt areas). Fires appear to have been most prevalent in the valleys, and less common on the mountainsides. The alluvial valley-fill soils generally support more fine fuels than the mountainsides, so it may be that fires rage through the flats and only just barely creep up the slopes. However, we have had very few plots in the higher mountainside areas so it’s possible that we have just not yet seen any burnt slopes. Fire definitely simplifies these ecosystems through promotion of fire-tolerant shrubs, a reduction in cacti, increasing fine fuel continuity, and unseen effects on the wider suite of native forbs and grasses that I have not yet observed because of the dry conditions this year. The burnt Sonoran ecosystem loses its beauty to a noticeable degree, and at times looks haggard. It would be an interesting effort to overlay fire occurrence layers with our data, although accurate records probably do not exist, and our plots are too far spaced to really say anything too specific in regards to community response to fire.
Thanks folks-
Joe
Tuesday, March 1, 2011
Week 4 - Gila Bend to the Tonto
Saturday, February 26, 2011
From Tonto to Yuma Proving Ground
Met up with Karen, Daniel, Nat, and Tasya in Tonto |
Gnarly roads in YPG |
We found this lizard hiding under a rock in the road, my lizard-squeezer friend says it's a Western Banded Gecko, Coleonyx variegatus. |
Beavertail Cactus |
Met up with Joe and Walt |
Tuesday, February 22, 2011
Red Team - Week 3 Tohono O'odham
We did see one of our first wildflowers, saw numerous burros, flushed some UDA's, and got to watch every border patrol agent that drove past our truck stop and look. It took all my will-power not to click the alarm to watch them freak out.
Thursday, February 17, 2011
from next to Nothing to beyond Hope
we found the Land of a Thousand Chollas...... and they found us.
we left our mark on the tomato during Shower Day
(good showers here in Wikiup, by the way!)
from here we encountered the Unforgettable Women of Wenden and the place where Salome danced (who's read Skinny Legs and All...?)
by the end of it all, we were beyond Hope.
Tuesday, February 15, 2011
Joke
Progress as of Feb. 22nd, 2011
These are all plots we've sampled so far. The green check-marks represent detections of our target invasives (invasives are present on at least one of the subplots), the red X's non-detections (target invasives are not present on any of the subplots), and the blue question-marks "unknowns". A plot get's an unknown classification if the data have not been submitted to me yet, or if the datasheets (where you are supposed to circle "yes" or "no" for the presence of any of the target invasives on the subplot) are incomplete. This is the case on datasheets for several of the plots. We should try to make sure this field gets an entry every time we sample a subplot. Plots for which you've submitted photos on our Picasa page have images associated with the features when you click on them on the map. It's a nice way to be able to relate what's visible in the imagery in Google Earth to what we know is on the ground.
First work period
Monday, February 14, 2011
Hawk - Our Valentine's Hero
Thursday, February 10, 2011
Red Team - Week 1
while we are waiting for our gps files, we decided to update! besides being very cold, last week was really fun. we worked with aaryn, brett, and tom. five people can make a plot very fast! on wednesday night we had to snuggle in the car because it was so cold, and now sarah has a cold. it was a smug free week.