Exploring Pollination Webs in the Hawaiian Islands
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1 Exploring Pollination Webs in the Hawaiian Islands Heather Sahli, Don Drake 1, Andrew Taylor 2, 1 Department of Botany 2 Department of Zoology University of Hawaii at Manoa
2 Importance of Pollinators Essential for plant reproduction in 80 90% of flowering plant species Facing global risk of decline Habitat loss and introduction of non native competitors and predators Islands particularly susceptible to pollinator loss Little known about pollinators of Hawaiian plants
3 Community Approach Quantifying plant pollinator interactions for majority of flowering plants in a community Interactions between alien and native species Which plants share pollinators/ which pollinators share plants? Distribution of generalists and specialists Data from Pat Aldrich, UH-Manoa Ph.D. candidate Pollination web at Pu u Wa awa a
4 Projects Sub alpine scrub Haleakala, Maui Coastal strand Ka ena Point, Oahu Dry Forest Puu Waawaa, Hawaii Early succession rainforest Mauna Loa, Hawaii Elevation Gradient Mauna Loa, Hawaii Later succession rainforest Mauna Loa, Hawaii
5 Comparative Roles of Native and Alien Species Changes in pollination webs along an elevation gradient (Hawaii) Indirect effects of invasive ants on plant reproduction (Maui)
6 Variation in Pollinator Webs Across an Elevation Gradient
7 2440m 880m
8 Methods Observed plants during 10 min intervals *Approx. 400 person hrs total over one year
9 Specific Questions How does elevation effect: 1) Visitation rates 2) Visitor composition Proportion of native and non native pollinators
10 Mean Visitation Rates Across Sites Mean visits/flwr/hr Elevation (m)
11 Changes in Native Pollinator Importance
12 Differences in Visitor Composition Flower visitors
13 Vaccinium calycinum Vaccinium reticulatum Arundina 1150m Web C = 0.24 Calliphorid* Other hemiptera Ant* Bethylidae Midge Red abdomen wasp* Leptecophylla Vespula* Other diptera Mouse* Metallic wasp Moth Metrosideros Hylaeus Toxomerus* Microlep Amakihi Dubautia Allograpta* Apis* White eye* Hylaeus pubescens Nysius Tachinid* Trupanea
14 1830m Web C = 0.42 Vaccinium reticulatum Coprosma Nysius Ant* Toxomerus* Other syrphid* Leptecophylla Hylaeus Hypochoeris Allograpta* Nesodynerus Other fly Midge Dubautia Metrosideros Apapane Tiny wasp Microlep Apis* Long winged fly Trupanea Other hemiptera Amakihi
15 Conclusions Middle elevations communities more complex and plants receive more visits What are the factors driving this pattern? Native pollinators increasingly more important at higher elevations
16 Pollinator Mediated Indirect Effects Upcountry Haleakala, Maui
17 Expanding Ant Invasion Paul Krushelnycky, USGS
18 Study Sites 300 m inside invasion 150 m inside invasion Invasion Front 100 m outside invasion
19 Leptecophylla tameiameiae Santalum haleakalae Geranium cuneatum
20 Visitation Rate by Plant Species
21 Visitor Composition 100m Outside Ant Invasion 150m Inside Ant Invasion 300m Inside Ant Invasion
22 Hylaeus Abundance (Pan Traps) Avg. #Hylaeus/trap/day 300m inside invasion 150m inside invasion Site Location 100m outside invasion
23 Haleakala Conclusions - -
24 Native pollinators: Conclusions Extremely important at mid and high elevations May not be easily replaced by non native pollinators Non native insect predators: Reduce native bee populations Indirectly effect plants by reducing flower visits Yellow faced bee (Hylaeus spp.)
25 Mahalo! Field work: Jonathan Koch Lan Truong Chandra Legdesog Mahina Patterson Michelle Elmore Doug Powless Melody Euaparadorn Pat Aldrich Paul Krushelnycky Funding: NSF EPSCoR UH Hilo PIPES/NSF REU
26 Elevation Gradient High elevation (2440m) Low elevation (880m)
27 *Arundina graminifolia (Bamboo orchid) *Hypochoeris radicata (Hairy cat s ear) Leptecophylla tameiameiae (Pūkiawe) Dubautia scabra Vaccinium reticulatum (Ōhelo) Metrosideros polymorpha ('Ōhi'a) Vaccinium calycinum (Ōhelo)
28 Flower Visitors Seed bug Yellow faced bee (Hylaeus spp.) *Syrphid fly Amakihi Arnold Gum 2005 Apapane Photo: Peter LaTourrette *Japanese white eye Photo: K.W. Bridges *Honeybee
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