Invasion Biology project presentation for the Invasion biology course at University of Copenhagen 2013

1. Martin Jung - 2013 1 | 9
Bidirectional effects of invasive species and
its implications for management
(Invasive)
(Invasive) ??

2. Martin Jung - 2013 2 | 9
Introduction
● Invasive species have unquestionable negative effects
● Many were introduced due to wellknown positive effects to
biodiversity and/or human welfare
●
Invasive species can also possess unintentional benefits
(Schlaepfer et al, 2010; Davis et al, 2011)
What does this imply for managementWhat does this imply for management
actions?actions?

3. Martin Jung - 2013 3 | 9
Case study: Amur Honeysuckle (Lonicera maackii)
● Native to China, Mongolia,
Japan (endangered)
● Introduced to the USA for
ornamental purposes
● Grows in disturbed areas
● Spreads vegetionally or by
fruit dispersal

4. Martin Jung - 2013 4 | 9
Bidirectional Effects of the Honeysuckle
Negative Positive
Outcompeting native plants
(Gorchov & Trisel, 2003)
Increases abundance of native birds
(Gleditsch & Carlo, 2011)
Toxic effect on amphibia
(Watling et al, 2011)
Improves fruit removal of native neighbouring plants
(Gleditsch & Carlo, 2011)
Removal reduces tick-borne disease risk
(Allan et al, 2010)
Faciliates pollination of native plants
(McKinney & Goodell, 2011)
Red berries mildly poisonous Use for oviposition and as food source for butterflies
(Graves & Shapiro, 2003)

5. Martin Jung - 2013 5 | 9
Native butterflies on exotic plants
● Up to 34% of californian
butterflies are known to use
exotic plants (Graves &
Shapiro, 2003)
● Use for Ovipositioning and
food source
● Also endangered species
(from Graves & Shapiro, 2003)

6. Martin Jung - 2013 6 | 9
Implications for Management
● Taylor’s checkerspot butterfly
is an carlifornian butterfly
threated by extinction
● Population size: 1000-1500
● Occurs in only two sites, which
are heavily invaded
● Uses the narrowleaf plantain
as sole host plant (Severns &
Warren, 2008)
Plantago lanceolata Euphydryas editha taylori

7. Martin Jung - 2013 7 | 9
(from Severns & Warren, 2008)
Incorporation into future conservation and habitat restoration actions !
Bidirectional Effects on an endangered species
(from Severns & Warren, 2008)

8. Martin Jung - 2013 8 | 9
Take home messages
● Invasive species can have positive and negative effects
● Over time exotic species might become indispensable through
noval food provision and stabilizing ecosystem services
● „,... it is time … to focus much more on the functions of
species, and much less on where they originated“ (Davis et al,
2011)

9. Martin Jung - 2013 9 | 9
Thank you for your attention !
References
● Allan, B.F., Dutra, H.P., Goessling, L.S., Barnett, K., Chase, J.M., Marquis, R.J., Pang, G., Storch, G.A.,Thach, R.E, & Orrock, J.L. (2010) Invasive
honeysuckle eradication reduces tick-borne disease risk by altering host dynamics. Proceedings of the National Academy of Sciences, 107, 18523-18527.
● Davis, M. A, Chew, M. K., Hobbs, R. J., Lugo, A. E., Ewel, J. J., Vermeij, G. J., Brown. J.H, Rosenzweig, M.L., Gardener, M.R., Carroll, S.P., Thompson, K.,
Pickett, S.T.A., Stromberg, J.C., Tredici, P., Suding, K.N., Ehrenfeld, J.G., Grime, J.P., Mascaro, J. & Briggs, J. C. (2011) Don't judge species on their origins.
Nature 474, 153-154.
● Gorchov, D. L. & Trisel, D.E. (2003) Competitive effects of the invasive shrub, Lonicera maackii (Rupr.) Herder (Caprifoliaceae), on the growth and survival of
native tree seedlings. Plant Ecology 166, 13-24.
● Gleditsch, J. M. & Carlo, T.A. (2011) Fruit quantity of invasive shrubs predicts the abundance of common native avian frugivores in central Pennsylvania.
Diversity and Distributions 17, 244-253.
● Graves, S. D. & Shapiro, A. M. (2003). Exotics as host plants of the California butterfly fauna. Biological conservation, 110, 413-433.
● Schlaepfer, M. A., Sax, D.F. & Olden, J.D. (2011) The Potential Conservation Value of Non‐Native Species. Conservation Biology, 25, 428-437.
● Severns, P.M. & Warren, A.D. (2008) Selectively eliminating and conserving exotic plants to save an endangered butterfly from local extinction. Animal
Conservation, 11, 476-483.
● Watling, J. I, Hickman, C.R., Lee, E., Wang, K. & Orrock, J. L. (2011) Extracts of the invasive shrub Lonicera maackii increase mortality and alter behavior of
amphibian larvae. Oecologia, 165, 153-159.