PA;pp.3-5. Available online at 
http://sgnis.org/publicat/proceed/aide/Aquatic%20Invaders%20of%20the%20Delaware%20Esutary.pdf. 
Pimentel, D; Lach, L; Zuniga, R; et al. (2000) Environmental and economic costs of nonindigenous species in the 
United States. BioScience 50( 1 ):53—65. 
Pimentel, D; Zuniga, R; Morrison, D. (2005) Update on environmental and economic costs associated with alien- 
invasive species in the United States. Ecol Econ 52:273-288. 
Porter, WP; Sabo, JL; Tracy, CR; et al. (2002) Physiology on a landscape scale: plant-animal interactions. Integ 
Comp Biol 42(5):431^*53. 
Pyke, CR; Thomas, R; Porter, RD; et al. (2008) Current practices and future opportunities for climate change and 
invasive species policy. Conserv Bio: in press. 
Rahel, FJ; Olden, JD. (2008) Assessing the effects of climate change on aquatic invasive species. Conserv Bio: in 
press. 
Ramey, V. (2001) Non-native invasive aquatic plants in the United States: Eichhornia crassipes. Center for Aquatic 
and Invasive Plants, University of Florida and Seagrant. Available online at 
http://aquatl.ifas.ufl.edu/seagrant/eiccra2.html [accessed May 2007]. 
Rejmanek, M; Richardson, DM. (1996) What attributes make some plant species more invasive? Ecology 
77(6): 1655—1661. 
Ricciardi A. (2001) Facilitative interactions among aquatic invaders: is an ‘invasional meltdown’ 
occurring in the Great Lakes? Can J Fish Aquat Sci 58:2513-2525. 
Ricciardi, A. (2006) Patterns of invasion in the Laurentian Great Lakes in relation to changes in vector activity. 
Divers Distrib 12(4):425^433. 
Richardson, DM; Pysek, P. (2006) Plant invasions - merging the concepts of species invasiveness and community 
invasibility. Prog Phys Geog 30(3):409-431. 
Root, TL; Price, JT; Hall, KR; et al. (2003) Fingerprints of global warming on wild animals and plants. Nature 
421(6918):57-60. 
Roura-Pascual, N; Suarez, AV; Gomez, C; et al. (2004) Geographical potential of Argentine ants (Linepithema 
humile Mayr) in the face of global climate change. Proc R Soc Lond B 271(1557):2527-2534. 
Ruiz, GM; Carlton, JT. (2003) Invasion vectors: conceptual framework for management. In Ruiz, GM; Carlton, JT; 
eds. Invasive species; vectors and management strategies. Washington, DC: Island Press; pp. 459-504. 
Scavia, D; Field, JC; Boesch, DF; et al. (2002). Climate change impacts on U.S. coastal and marine ecosystems. 
Estuaries 25(2): 149-164. 
Schnitzler, A; Muller, S. (1998) Ecology and biogeography of highly invasive plants in Europe: giant knotweeds 
from Japan (Fallopia japonica and F. sachalinensis). Rev Ecol Terre Vie 53(1).3—38. 
Seager, R; Ting, M; Held, I; et al. (2007) Model projections of an imminent transition to a more arid climate in 
southwestern North America. Science 316(5828): 1181-1184. 
Shafroth, PB; Stromberg, JC; Patten, DT. (2002) Riparian vegetation response to altered disturbance and stress 
regimes. Ecol Appl 12( 1): 107—123. 
R-7 
