Direct and indirect influences of rusa deer in the Royal National Park

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1 Direct and indirect influences of rusa deer in the Royal National Park Clare McArthur 1, Helen Stephens 1, Simen Pedersen 2, David Keith 3 1 School of Biological Sciences, The University of Sydney 2 Hedmark University College, Evenstad, Norway 3 NSW Office of Environment and Heritage 1

2 Deer: then and now Introduced 1906 by the Park Trust Now high densities in parts of the Park ABUNDANT, INVASIVE What IMPACT?

3 Potential direct & indirect interactions Bird s Insects Soil microbes Small mammals

4 Long-term aims Quantify impact of rusa deer in the Royal National Park Understand foraging behaviour underpinning impacts Predict future impacts Link management to actual & predicted impacts

5 Direct effects of deer? 1. How severely are trees and shrubs browsed? (variation among species?) 2. Do rusa deer prefer some plant species over others? 3. Does neighbouring vegetation affect browsing of individual plants? 4. Does browsing plant reproductive output? long-term survival long-term spatial distribution of plants

6 Study site: Jibbon-Bundeena sandy heathland

7 Q1. How severely are trees and shrubs browsed? (variation among species?) Conclusion Choose pathways to find/avoid plant species? Methods Survey of browsing along animal pathways Results 55 species identified in area Only 30 species sampled on pathways

8 defended? Results: Q1. How severely are trees and shrubs browsed? (variation among species?) Conclusion: Differentially browsed; due to structure / chemistry?? e.g. Melaleuca nodosa prickly and toxic? Allocasuarina distyla poorly Browsing severity varies enormously among species: Plant species Foliage browsed (%) Allocasuarina distyla 70 Persoonia levis 67 Corymbia gummifera 36 Leptospermum trinervium 31 Acacia suaveolens 30 Melaleuca nodosa 1 Not due to variation due to plant size/abundance (data not shown)

9 Q2. Rusa deer prefer some plant species over others? 9 plant species: 5: browsing survey 4: observations Equal mass per plot (bucket) Randomised block design Foliage browsed (%) 18 days

10 Site for preference trial

11 Visitors? Sand pads to record visitors Deer : Wallaby ~ 5:1 Deer Wallaby

12 Q2. Deer preferences? YES Conclusions: 1. highly preferred vs. intermediate vs. unpreferred 2. shift to unpreferred plant community? Foliage browsed (%) Days since start of experiment } a a,b b,c } c Eucalyptus sieberi Leptospermum trinervium Angophora costata Allocasuarina distyla Corymbia gummifera Melaleuca nodosa Acacia suaveleons Banksia ericifolia Lomandra longifolia

13 Q3. Do neighbours matter? Plots of Allocasuarina 5 neighbouring species 2x high preference Persoonia levis Leptospermum trinervium 2x low preference Banksia serrata Melaleuca nodosa 1x equal preference (same species) Allocasuarina distyla

14

15 Q3. Do neighbours matter? YES Conclusion: Neighbours can hinder or exacerbate browsing Browse of Allocasuarina (%) Day 3 Day 6 Day 9 Neighbouring plant species: Allocasuarina Leptospermum Persoonia Banksia Melaleuca F (4,20) = 2.88 p < 0.05

16 Q4. Does browsing plant reproductive output? Conclusion: probably No. of flowers Foliage browsed (%)

17 Potential direct & indirect interactions

18 Potential direct & indirect interactions Small mammals

19 Q. Do deer affect the abundance of small mammals? Study area within the Park the coast to 5 km inland Coastal Sandstone Plateau Heath < 2 m tall Methods Small mammal live-trapping 33 sites, 4 nights per site Each site: six Elliott traps along a 50 m transect, ~ 10 m apart Current deer use and current wallaby use at each site: density of fecal pellets (scats) along the 1 50 m trap transect

20 Q. Do deer affect the abundance of small mammals? Species Brown antechinus Antechinus stuartii australianmuseum.net.au Bush rat Rattus fuscipes Swamp rat Rattus lutreolus New Holland Mouse Pseudomys novaehollandiae

21 Indirect effects of deer? Captures * * * Current deer (scats) No deer Deer 0 Antechinus Bush rat Swamp rat New Holland mouse

22 Wallaby? 4 3 * Current deer (scats) No deer Deer Captures 2 1 * * 0 Antechinus Bush rat Swamp rat New Holland mouse

23 Conclusions: direct & indirect interactions Bird s Insects Soil microbes Small mammals

24 Conclusions: direct & indirect interactions Conclusions DEER ABUNDANT, INVASIVE What IMPACT? Evidence for both direct and indirect interactions Preferential pathways through vegetation Preferential browsing of plants depending species (and neighbours) Weak evidence of reproductive output of plants small mammal captures (causal?) Deer likely to be drivers in this ecosystem Changing the vegetation community

25 Secondary Acknowledgments chemistry NPWS, including Sharon Evans Victor Harnadi James Hook David Keith Craig Shepherd Bill Sullivan Sutherland Shire Council Nursery Ian McIntosh Volunteers: Diane Stephens Matt Bond Paul Bland Lindsey Gray Emilie Kissler Eszter Kovacs Kylie Pethybridge Clare Singleton Laura Stephens Richard Stephens Zhani & Alexander Katherine Tuft Scott VB Others: Charlotte Taylor Kristin Connell Mitch Scott Lisbeth Chris Dickman Iain Gordon Mathew Crowther

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