Successful restoration of plant communities
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- Darlene Allen
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1 Successful restoration of plant communities WHY POLLINATORS MATTER Andrea T. Kramer Ph.D. Candidate, 2008 July 19, 2007
2 Today s presentation Area of study: the Great Basin Why restoration is needed What Chicago Botanic Garden is doing, and why Research on wildflowers and their pollinators to help understand how to restore them once they have been lost from a site.
3 Areas of study
4 A great need for restoration Over 1/3 of Great Basin habitat is in need of restoration cattle grazing cheatgrass Fire and loss of native plant communities
5 A need for large-scale restoration Great Basin: ~210,000 square miles OREGON IDAHO NEVADA UTAH Area in need of restoration ~ state of Illinois
6 Plant-focused restoration efforts Undisturbed Site Disturbed Site Cheatgrass (0.7%) Rock/Bare Ground (63%) Shrub or Tree (30%) Native Grass (2%) Wildflower (4%) Cheatgrass (49%) Rock/Bare Ground (50%) Shrub (0.8%) Native Grass (0.7%) Cattle Dung (0.2%)
7 A need for research Grasses and sagebrush are relatively well studied (very common, high grazing value) Very little known about many wildflowers
8 Research to meet large-scale restoration needs Restoration often means reseeding areas after wildfires (frequently with the use of helicopters) Goal: to slow the fire cycle by getting native species to establish and compete with cheatgrass Requires large quantities of seeds!
9 Research to meet large-scale restoration needs Development of agricultural practices to produce large quantities of native seeds Federal government and private seed growers eshow.shtml High cost of restoration failure: Where should seeds come from?
10 Chicago Botanic Garden s Role? The seed sourcing question: Can seed from one source be used everywhere? NEVADA UTAH??
11 Answering the seed source question Common garden studies Incubators (CBG s seed lab) and CBG greenhouses Field sites (Utah State University & Boise State University) If genetic differences exist, moving seeds too far from their source may lead to poor restoration success
12 Common garden studies at CBG Adaptation to climatic conditions: seeds from sites with short winters germinate faster than seeds from sites with long winters Number Average of days days to to germination R 2 = Average Number days below of days freezing below freezing Increased risk of restoration failure if seed source is incorrect
13 Common garden studies in UT and ID Adaptation to climatic conditions: plants from sites with short summers grow and flower faster than plants from sites with long summers Increased risk of restoration failure if seed source is incorrect
14 Unexpected results Penstemon deustus (hot rock penstemon)
15 Hot rock Penstemon Found in similar habitat throughout Great Basin NEVADA UTAH FIRST YEAR - few differences between sites: one source OK for restoration everywhere? SECOND YEAR - flower shape and size VERY different between sites: one source NOT OK for restoration everywhere
16 Unexpected differences in flowers Significantly different flower shapes and sizes found in different regions NEVADA UTAH Measurement Significance Floral angle *** Lip angle * Corolla length *** Central corolla width *** Posterior corolla width *** Mouth diameter ** Central segment width *** Anther exertion *** Lower lip area ***
17 Flower differences due to pollinator differences? Observe pollinators (bees) visiting plants at original collection sites Western Nevada: small flowers and small bee visitors Central Nevada: medium flowers and medium bee visitors Eastern Nevada: large flowers and bumblebee (large) visitors Different regions contain distinct pollinators: flower shape and size appears to be linked to these differences Pollinators matter when choosing seed sources for restoration
18 Knowledge gained Seed source matters Wildflowers in the Great Basin adapted to both climaticand biological differences in the region, driving important genetic differences in many traits Seed germination, growth rate, pollinators Using seeds from different sources indiscriminately may lead to the failure of a restoration First generation (lack of germination) Second generation (failure to produce seeds)
19 If wildflowers are restored, will pollinators follow? Undisturbed Site Disturbed Site Cheatgrass (0.7%) Rock/Bare Ground (63%) Shrub or Tree (30%) Native Grass (2%) Wildflower (4%) Cheatgrass (49%) Rock/Bare Ground (50%) Shrub (0.8%) Native Grass (0.7%) Cattle Dung (0.2%)
20 Sampling for pollinators Introduced potted plants to disturbed and undisturbed sites Observed pollinator visits
21 Significant differences between sites Undisturbed site (417 total visits) Lower diversity of visitors at disturbed site Tiny dark bees (1) Small dark bees (106) Medium dark bees (106) Large dark bees (63) Small metallic green bees (48) Large metallic green bees (1) Megachile bee (5) Xylocopa bee (10) Wasps (4) Beetles (49) Flies (2) Butterflies (6) Ants (14) Over 4 times fewer visits to potted plants at disturbed site Disturbed site (86 total visits) Tiny dark bees (1) Small dark bees (51) Large metallic green bees (1) Peponapis bee (9) Wasps (4) Flies (1) Butterflies (19)
22 Knowledge gained Disturbed sites contain fewer potential pollinators Wildflowers restored to these sites may not receive enough pollinator visits to successfully reproduce Restoration efforts should incorporate both wildflowers and pollinators Restoration research can benefit from a multidisciplinary and collaborative approach
23 Goals going forward Share knowledge Continue to present results at meetings and publish in peer-reviewed and popular journals to reach diverse audiences Researchers (botanists, entomologists), federal land managers, policy makers, seed growers Directly inform policy Continue collaboration with researchers at federal agencies, universities, and botanic gardens nationwide to draft recommendations for federal policies on seed transfer guidelines
24 Acknowledgements Research team: Dr. Kayri Havens Medard and Elizabeth Welch Director, Division of Plant Science and Conservation Dr. Jeremie Fant CBG molecular ecologist/conservation scientist Rebecca Tonietto student in CBG/Northwestern Master s Program in Plant Biology & Conservation Thanks to: Dr. Mary Ashley Professor, UIC Biological Sciences Department Oscar Herrera College First student Charlie Flower volunteer and student in UIC s LEAP doctoral program Additional assistance and funding: Bureau of Land Management Center for Plant Conservation Center for Invasive Plant Management University of Illinois, Chicago
25
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