The Impact of Deer on Community Composition and Plant Performance in the Threatened Garry Oak Ecosystem. Cora L. Skaien and Dr.
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1 The Impact of Deer on Community Composition and Plant Performance in the Threatened Garry Oak Ecosystem Cora L. Skaien and Dr. Peter Arcese
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3 Invertebrate and vertebrate herbivores consume ~15% of plant biomass annually (Cyr and Pace 1993).
4 Invertebrate and vertebrate herbivores consume ~15% of plant biomass annually (Cyr and Pace 1993). With herbivory, plants become extinct or develop tolerance or resistance mechanisms (Ehrlich and Raven 1964) that can lead to evolutionary change.
5 Invertebrate and vertebrate herbivores consume ~15% of plant biomass annually (Cyr and Pace 1993). With herbivory, plants become extinct or develop tolerance or resistance mechanisms (Ehrlich and Raven 1964) that can lead to evolutionary change. Complication: interactions with other, often exotic, species makes predictions difficult.
6 Herbivore Removal: Positive Influence on Species Abundance Species in Habitat: Native Trillium erectum 1 Exotic Alliaria petiolata Kalisz et al. 2014
7 Herbivore Removal: Positive Influence on Species Abundance Species in Habitat: Native Trillium erectum 1 Exotic Alliaria petiolata Kalisz et al. 2014
8 Herbivore Removal: Positive Influence on Species Abundance Species in Habitat: Native Trillium erectum 1 Exotic Alliaria petiolata Kalisz et al. 2014
9 Herbivore Removal: Positive Influence on Species Abundance Species in Habitat: Native Sp. Benefits When Ungulate Herbivores Removed Native Trillium erectum 1 Exotic Alliaria petiolata Kalisz et al. 2014
10 Species Response to Herbivore Removal: Negative Influence on Growth Species in Habitat: Native Carex spp. 1 Native Geranium spp. 2 Exotic Alliaria petiolata Waller and Maas 2013
11 Species Response to Herbivore Removal: Negative Influence on Growth Species in Habitat: Native Carex spp. 1 Native Geranium spp. 2 Exotic Alliaria petiolata Waller and Maas 2013
12 Species Response to Herbivore Removal: Negative Influence on Growth Species in Habitat: Native Carex spp. 1 Native Geranium spp. 2 Exotic Alliaria petiolata Waller and Maas 2013
13 Species Response to Herbivore Removal: Negative Influence on Growth Species in Habitat: Native Sp. Suffers When Ungulate Herbivores Removed Native Carex spp. 1 Native Geranium spp. 2 Exotic Alliaria petiolata Waller and Maas 2013
14 Species Response to Herbivore Removal: Evolutionary Change Primula farinosa Spatial variation in stipe length maintained by: 1. Presence of deer, herbivory selects for shorter plants. 2. Absence of deer, pollination selects for taller plants. Agren et al vit/birdseye-primrose
15 Natives Exotics and Deer Research Question We know that natives respond differently to herbivore removal depending on community composition and interactions with other plant species.
16 Research Question We know that natives respond differently to herbivore removal depending on community composition and interactions with other plant species. How does a degraded Garry Oak and Maritime Meadow Ecosystem respond to ungulate herbivore removal?
17 Garry Oak and Maritime Meadow Ecosystem
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22 OR
23 OR deer/km 2
24 Martin, Arcese & Scheerder (2011) OR deer/km 2
25 Garry Oak and Maritime Meadow Ecosystem 1. Reduced to 5% of its original extent 2. Highly invaded by exotic herbaceous and grass species 3. Habitats with spatial and temporal heterogeneity in deer densities: islands with over-grazed conditions or no deer 4. Some iconic natives include: Plectritis congesta, Brodiaea spp. and Camas spp.
26 Brodiaea Spp. Brodiaea hyacinthina 1 Brodiaea corms 2 Brodiaea coronaria
27 Plectritis congesta Morphology With Deer: Without Deer: cm cm Skaien and Arcese, in review
28 Grazed vs Non-Grazed Locations Garry Oak and Maritime Meadow Ecosystem
29 Research Questions 1. Does protection from deer influence native and exotic species cover in and out of exclosures? 2. Do exotic species impede or facilitate the recovery of natives when open to or protected from deer? 3. Do Brodiaea spp. increase in corm abundance and size after herbivore removal? 4. Do Plectritis congesta populations have a fitness advantage in presence of ungulate herbivores when originating from areas with deer?
30 Sidney Island Exclosures Deer Density: deer/km 2 x 2 Established in May 2012 INSIDE EXCLOSURE (WEST) OUTSIDE EXCLOSURE (EAST) P. congesta seeds sown in 2013 (inside and out). 2. Native and exotic species cover, Brodieae spp. corm abundance and size, and fitness of P. congesta plants assessed in 2014 and 2016.
31 Sidney Island Exclosures 0.75 m Deer Density: deer/km 2 x 2 Established in May 2012 INSIDE EXCLOSURE (WEST) OUTSIDE EXCLOSURE (EAST) Planting locations of P. congesta and determination of exotic and native species cover
32 Sidney Island Exclosures 0.75 m 0.3 m x 645 in and out 0.3 m Deer Density: deer/km 2 x 2 Established in May 2012 INSIDE EXCLOSURE (WEST) OUTSIDE EXCLOSURE (EAST) 0.3 x 0.3 m quadrats to determine percent cover of all species present, native and exotic
33 Sidney Island Exclosures 1.5 m 500 cm 3 soil; x 40 in and out x 2 Established in May 2012 INSIDE EXCLOSURE (WEST) OUTSIDE EXCLOSURE (EAST) Determination of Brodiaea corm abundance and size
34 Exclosure Adjacent Plot
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36 Exotic and Native Species: 2014 inside outside Skaien and Arcese, submitted
37 Exotic and Native Species: Native species cover was 2x greater in exclosures; Brodiaea sp. 3.7x greater 2. Exotic species cover showed no differences in and out of exclosures inside outside Skaien and Arcese, submitted
38 Exotic and Native Species: Native species cover was 2x greater in exclosures; Brodiaea sp. 3.7x greater 2. Exotic species cover showed no differences in and out of exclosures inside outside Skaien and Arcese, submitted
39 Exotic and Native Species: 2016 Table: The ratio of percent cover of above ground tissue inside exclosures relative to outside of exclosures. Values above 1 indicate higher percent cover inside exclosures Native Species Cover 2.0 x 3.3 x Brodiaea sp. Cover 3.7 x 7.4 x Invasive Species Cover = = Skaien and Arcese, submitted
40 Skaien and Arcese, submitted Brodiaea Corm Abundance 5.3x more
41 Skaien and Arcese, submitted Brodiaea Corm Abundance 5.3x more
42 Skaien and Arcese, submitted Brodiaea Corm Abundance 5.3x more 2.3x more
43 Skaien and Arcese, submitted Brodiaea Corm Abundance 2.3x more
44 Skaien and Arcese, submitted Brodiaea Corm Abundance Location * Year P = x more 2.3x more
45 Brodiaea Corm Size Skaien and Arcese, submitted
46 Brodiaea Corm Size Skaien and Arcese, submitted
47 Skaien and Arcese, submitted Brodiaea Corm Size Location * Year P = 0.003
48 Brodiaea Sp. Number of corms increasing over time with deer removal compared to locations with deer Average size of corms larger where deer are absent in both years, but decreased from 2014 to 2016: suggestive of asexual budding causing a larger number of smaller bulbs being present
49 Fitness Differences in P. congesta P. congesta inside exclosures in May Skaien and Arcese, submitted
50 Fitness Differences in P. congesta P. congesta inside exclosures in May Skaien and Arcese, submitted
51 Fitness Differences in P. congesta P. congesta inside exclosures in May Skaien and Arcese, submitted
52 Proportion Survived Survival Differences? 24.1% 23.4% 14.0% Population Origin: Deer No Deer 4.6% Inside Outside Inside Outside Inside Outside December March May 3-way interaction P < Skaien et al. unpublished
53 Proportion Survived Survival Differences? 24.1% 23.4% 14.0% Population Origin: Deer No Deer 4.6% Inside Outside Inside Outside Inside Outside December March May 3-way interaction P < Skaien et al. unpublished
54 Proportion Survived Survival Differences? 24.1% 23.4% 14.0% Population Origin: Deer No Deer 4.6% Inside Outside Inside Outside Inside Outside December March May 3-way interaction P < Skaien et al. unpublished
55 Proportion Survived Survival Differences? 24.1% 23.4% 14.0% Population Origin: Deer No Deer 4.6% Inside Outside Inside Outside Inside Outside December March May 3-way interaction P < Skaien et al. unpublished
56 Proportion Survived Survival Differences? 24.1% 23.4% 14.0% Population Origin: Deer No Deer 4.6% Inside Outside Inside Outside Inside Outside December March May 3-way interaction P < Skaien et al. unpublished
57 Proportion Survived Survival Differences? 24.1% 23.4% 14.0% Population Origin: Deer No Deer 4.6% Inside Outside Inside Outside Inside Outside December March May 3-way interaction P < Skaien et al. unpublished
58 Height (cm) How Does Mean Height Affect Differential Survival? Survival? Population Origin: Deer No Deer Inside Outside Inside Outside Inside Outside December March May Mean Height Deer Browsed in May: 2.6 cm
59 Height (cm) How Does Mean Height Affect Differential Survival? Survival? Difference corresponds with first decrease in survival for plants from populations without deer when outside exclosures Population Origin: Deer No Deer Inside Outside Inside Outside Inside Outside December March May Mean Height Deer Browsed in May: 2.6 cm
60 Exotics Natives Conclusions
61 Exotics Natives Conclusions
62 Exotics Natives Conclusions Potential Facilitation
63 Exotics Natives Conclusions
64 Exotics Natives Conclusions
65 Implications These results suggest: 1. Removal of deer is sufficient to instigate restoration of degraded Garry Oak and Maritime Meadow Ecosystems. 2. Locally adapted P. congesta populations should be used as a source of seed for restoration of these ecosystems. Caution: exotics likely to influence natives on longer scale
66 Implications These results suggest: 1. Removal of deer is sufficient to instigate restoration of degraded Garry Oak and Maritime Meadow Ecosystems. 2. Locally adapted P. congesta populations should be used as a source of seed for restoration of these ecosystems.
67 Implications These results suggest: 1. Removal of deer is sufficient to instigate restoration of degraded Garry Oak and Maritime Meadow Ecosystems. 2. Locally adapted P. congesta populations should be used as a source of seed for restoration of these ecosystems. Caution: exotics likely to influence natives negatively on longer time scale
68 Acknowledgements Supervisor: Dr. Peter Arcese Sidney Island Volunteers: - Paul LaLonde, Krista Cote, Ada Roman, Julie Houde, Lorraine Campbell, Nina Morell, Kaia Bryce, Katie Turner, Patrick Zhao, Kate Johnson, Ross Hedley, Julia Hedley, Joanna Li Yung Lung, Marc-Antoni Goulet, Dan Polster, Islands Trust, Maureen McDonald BRITE Funding
69 Questions?
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