RE: [beemonitoring] Prairie biofuel surveys
Elaine- Ceratina and maybe Hylaeus come to mind as cavity nesters for your herbacous prairie vegetation, maybe the smaller megachilids too. Flight vagility will vary with body size, and dispersal distances into trap blocks may not correspond with foraging distances. Prairies have been hayed for more than a century, and burned for much longer than that, so cavity-nesters that are still around must have been putting up with this for a long time. Indeed, land use history on those plots will be important to know. I am inclined to agree with you, that of all the ways you could modify prairie, this one probably will be among those with least impact on bee faunas. Now if it enocouraged more prairie restorations because it gave them value, why that might even be good!
PS You are familiar with the several papers by Catherine Reed on tall grass prairie bee faunas, I presume.
James H. Cane
USDA-ARS Bee Biology and Systematics Lab
Utah State University , Logan , UT 84322 USA
tel: 435-797-3879 FAX: 435-797-0461
web page: www.ars.usda.gov/npa/beelab
"Seek simplicity but distrust it."
Alfred North Whitehead
- Hello, Elaine, thanks to 'orthography' we have a pretty much :east to west precipitation gradient in going west from Ohio valley. Our praries 'grasses' consequently differ in their assemblage-ecosystems...going :east to west. Growth season for regions along this gradient(east to west) are strongly adapted/linked to precipitation.Your rather unclear description of: 'harvest protocol', but note of:'September harvest'....leads to asking you: what criteria of 'growth-season recovery' are you using?Precipitation being the driver of growthseason, have you first (our praries severely fragmented already in con-US)...have you first honestly defined 'prarie growthseason for Mn, in times of drought?'. Always a temptation in 'celulosic fuel protocols' to follow the 'energyyield of a particular resource plant'...and ignore the community assemblage...sort of 'a drift to monoculture', rather than prarie stewardship.Long story short, what criteria are you using for 'growthseason recovery' in your various treatments? charlie guevara NJ,US
--- On Thu, 11/20/08, Pierre Martineau <pierrem@...> wrote:
From: Pierre Martineau <pierrem@...>
Subject: RE: [beemonitoring] Prairie biofuel surveys
Date: Thursday, November 20, 2008, 4:41 PM
Elaine: What is the method of harvest? Will it affect the soil structure? Pierre -----Original Message----- From: email@example.com [mailto:firstname.lastname@example.org]On Behalf Of elaineceleste Sent: Thursday, November 20, 2008 8:12 AM To: email@example.com Subject: [beemonitoring] Prairie biofuel surveys Hello all. I am working with some ecologists at the U of MN who are doing a grand scale study looking at using established prairies as sources of biofuel. The study focuses on the impact of different harvest regimes on wildlife. They are looking at many different groups but they would like to include bees. The study in a nutshell: There will be from 3 to 6 target areas in different parts of the state. Each target area will be organized into four blocks. All treatments will appear in each block. Each treatment will be as large as possible with the goal of 10 to 40 acres. So there will be four replicates in each target area. The treatments are 100% harvest, harvest all but 25%, harvest all but 10%. Harvest will take place in late Sept. They'll be examining effects on birds, small mammals, soil macro-invertebrates, and a slew of other things. In thinking about what bee groups will be most impacted by this, I am guessing it may be stem nesters. I'm thinking about using both pan traps (bee bowls) and trap nesting. I have concerns about the treatments affecting the attractiveness of the traps. If there is 10 acres of stubble, the trap nests and bowl will be more visible and attractive. I've thought about bumble bee surveys at flowers, but I am afraid of too much variation between field workers as I am not sure how much training they will get. Sweep netting to supplement the bowl traps is a good possibility. Although I have experience identifying a wide variety of bees, I need to learn more about their biologies. Does anyone have a sense of the distance from which trap nests would attract bees? Would they be likely to draw in bees from off the plot? Ideas about what prairie plants are most used by stem nesters? What bee groups do you think would be affected, either positively or negatively, by having vegetation removed in the fall? My first guess is that there won't be an impact on bees or rather that any impact will not be as large as the bee population variability due to things like weather and disease, and so will be difficult to measure. However, I love the idea of getting some bee survey information for various regions in MN and this may be a good excuse for that. I look forward to hearing your ideas. -Elaine Evans http://www.befriendingbumblebees.con ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/beemonitoring/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/beemonitoring/join (Yahoo! ID required) <*> To change settings via email: mailto:firstname.lastname@example.org mailto:email@example.com <*> To unsubscribe from this group, send an email to: firstname.lastname@example.org <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/