Ambio

, Volume 47, Issue 4, pp 493–503 | Cite as

Conserving connectivity: Human influence on subsidy transfer and relevant restoration efforts

  • Emily V. Buckner
  • Daniel L. Hernández
  • Jameal F. Samhouri
Review

Abstract

Conservation efforts tend to focus on the direct impacts humans have on their surrounding environment; however there are also many ways in which people indirectly affect ecosystems. Recent research on ecological subsidies—the transfer of energy and nutrients from one ecosystem to another—has highlighted the importance of nutrient exchange for maintaining productivity and diversity at a landscape scale, while also pointing toward the fragility of ecotones and vulnerability of subsidies to human activities. We review the recent literature on landscape connectivity and ecosystem subsidies from aquatic systems to terrestrial systems. Based on this review, we propose a conceptual model of how human activities may alter or eliminate the flow of energy and nutrients between ecosystems by influencing the delivery of subsidies along the pathway of transfer. To demonstrate the utility of this conceptual model, we discuss it in the context of case studies of subsidies derived from salmon, marine mammals, sea turtles, sea birds, and shoreline debris. Subsidy restoration may require a different set of actions from simply reversing the pathway of degradation. We suggest that effective restoration and conservation efforts will require a multifaceted approach, targeting many steps along the subsidy transfer pathway, to address these issues.

Keywords

Conservation Ecotone Ecological subsidies Landscape connectivity 

Notes

Acknowledgements

We would like to thank the Gordon & Betty Moore Foundation for their generous support of the Ocean Tipping Points project, friends and family for their support, and the public library system for its unwavering presence and generous hours wherever/whenever the paper needed to be worked on (especially the Elizabeth C. Miller Library and the public libraries located in Ely, MN, and Fairbanks, AK). We also gratefully acknowledge BHO for his compassion during the development of this paper.

References

  1. Anderson, W.B., and G.A. Polis. 1999. Nutrient fluxes from water to land: Seabirds affect plant nutrient status on Gulf of California islands. Oecologia 118: 324–332.CrossRefGoogle Scholar
  2. Baxter, C.V., K.D. Fausch, M. Murakami, and P.L. Chapman. 2004. Fish invasion restructures stream and forest food webs by interrupting reciprocal prey subsidies. Ecology 85: 2656–2663.CrossRefGoogle Scholar
  3. Beisner, B.E., D.T. Haydon, and K. Cuddington. 2003. Alternative stable states in ecology. Frontiers in Ecology and the Environment 1: 376–382.CrossRefGoogle Scholar
  4. Bishop, M.J., and B.P. Kelaher. 2013a. Context-specific effects of the identity of detrital mixtures on invertebrate communities. Ecology and Evolution 3: 3986–3999.CrossRefGoogle Scholar
  5. Bishop, M.J., and B.P. Kelaher. 2013b. Replacement of native seagrass with invasive algal detritus: Impacts to estuarine sediment communities. Biological Invasions 15: 45–59.CrossRefGoogle Scholar
  6. Bottrill, M.C., L.N. Joseph, J. Carwardine, M. Bode, C. Cook, E.T. Game, H. Grantham, S. Kark, et al. 2008. Is conservation triage just smart decision making? Trends in Ecology & Evolution 23: 649–654.CrossRefGoogle Scholar
  7. Bouchard, S.S., and K.A. Bjorndal. 2000. Sea turtles as biological transporters of nutrients and energy from marine to terrestrial ecosystems. Ecology 81: 2305–2313.CrossRefGoogle Scholar
  8. Call, K.A., and T.R. Loughlin. 2005. An ecological classification of Alaskan Steller sea lion (Eumetopias jubatus) rookeries: A tool for conservation/management. Fisheries Oceanography 14: 212–222.CrossRefGoogle Scholar
  9. Carlton, J.T., and J. Hodder. 2003. Maritime mammals: Terrestrial mammals as consumers in marine intertidal communities. Marine Ecology Progress Series 256: 271–286.CrossRefGoogle Scholar
  10. Christie, K.S., M.D. Hocking, and T.E. Reimchen. 2008. Tracing salmon nutrients in riparian food webs: Isotopic evidence in a ground-foraging passerine. Canadian Journal of Zoology-Revue Canadienne De Zoologie 86: 1317–1323.CrossRefGoogle Scholar
  11. Cline, T.J., D.E. Schindler, and R. Hilborn. 2017. Fisheries portfolio diversification and turnover buffer Alaskan fishing communities from abrupt resource and market changes. Nature Communications 8: 14042.CrossRefGoogle Scholar
  12. Cloern, J.E. 2007. Habitat connectivity and ecosystem productivity: Implications from a simple model. American Naturalist 169: E21–E33.CrossRefGoogle Scholar
  13. Compton, J.E., C.P. Andersen, D.L. Phillips, J.R. Brooks, M.G. Johnson, M.R. Church, W.E. Hogsett, M.A. Cairns, et al. 2006. Ecological and water quality consequences of nutrient addition for salmon restoration in the Pacific Northwest. Frontiers in Ecology and the Environment 4: 18–26.CrossRefGoogle Scholar
  14. Crawley, K.R., G.A. Hyndes, M.A. Vanderklift, A.T. Revill, and P.D. Nichols. 2009. Allochthonous brown algae are the primary food source for consumers in a temperate, coastal environment. Marine Ecology Progress Series 376: 33–44.CrossRefGoogle Scholar
  15. Croll, D.A., J.L. Maron, J.A. Estes, E.M. Danner, and G.V. Byrd. 2005. Introduced predators transform subarctic islands from grassland to tundra. Science 307: 1959–1961.CrossRefGoogle Scholar
  16. Dethier, M.N., W.W. Raymond, A.N. McBride, J.D. Toft, J.R. Cordell, A.S. Ogston, S.M. Heerhartz, et al. 2016. Multiscale impacts of armoring on Salish Sea shorelines: Evidence for cumulative and thresholds effects. Estuarine, Coastal and Shelf Science 175: 106–117.CrossRefGoogle Scholar
  17. Doughty, C.E., J. Roman, S. Faurby, A. Wolf, A. Haque, E.S. Bakker, Y. Malhi, et al. 2015. Global nutrient transport in a world of giants. PNAS.Google Scholar
  18. Dugan, J.E., and D.M. Hubbard. 2016. Sandy Beaches. In Ecosystems of California, ed. H. Mooney, and E. Zavaleta, 389–408. Oakland: California, University of California Press.Google Scholar
  19. Dugan, J.E., D.M. Hubbard, M.D. McCrary, and M.O. Pierson. 2003. The response of macrofauna communities and shorebirds to macrophyte wrack subsidies on exposed sandy beaches of southern California. Estuarine, Coastal and Shelf Science 58: 25–40.CrossRefGoogle Scholar
  20. East, A.E., G.R. Pess, J.A. Bountry, C.S. Magirl, A.C. Ritchie, J.B. Logan, T.J. Randle, et al. 2015. Large-scale dam removal on the Elwha River, Washington, USA: River channel and floodplain geomorphic change. Geomorphology 228: 765–786.CrossRefGoogle Scholar
  21. Epanchin, P.N., R.A. Knapp, and S.P. Lawler. 2010. Nonnative trout impact an alpine-nesting bird by altering aquatic-insect subsidies. Ecology 91: 2406–2415.CrossRefGoogle Scholar
  22. Farina, J.M., S. Salazar, K.P. Wallem, J.D. Witman, and J.C. Ellis. 2003. Nutrient exchanges between marine and terrestrial ecosystems: The case of the Galapagos sea lion Zalophus wollebaecki. Journal of Animal Ecology 72: 873–887.CrossRefGoogle Scholar
  23. Foley, M.M., J.A. Warrick, A. Ritchie, A.W. Stevens, P.B. Shafroth, J.J. Duda, M.M. Beirne, et al. 2017. Coastal habitat and biological community response to dam removal on the Elwha River. Ecological Monographs.Google Scholar
  24. Freeman, M.C., C.M. Pringle, E.A. Greathouse, and B.J. Freeman. 2003. Ecosystem-level consequences of migratory faunal depletion caused by dams. Biodiversity, Status, and Conservation of the World’s Shads 35: 255–266.Google Scholar
  25. Fukami, T., D.A. Wardle, P.J. Bellingham, C.P.H. Mulder, D.R. Towns, G.W. Yeates, K.I. Bonner, et al. 2006. Above- and below-ground impacts of introduced predators in seabird-dominated island ecosystems. Ecology Letters 9: 1299–1307.CrossRefGoogle Scholar
  26. Gende, S.M., R.T. Edwards, M.F. Willson, and M.S. Wipfli. 2002. Pacific salmon in aquatic and terrestrial ecosystems. BioScience 52: 917–928.CrossRefGoogle Scholar
  27. Gittman, R.K., S.B. Scyphers, C.S. Smith, I.P. Neylan, and J.H. Grabowski. 2016. Ecological consequences of shoreline hardening: A meta-analysis. BioScience 66: 763–773.CrossRefGoogle Scholar
  28. Goldman, R.L., H. Tallis, P. Kareiva, and G.C. Daily. 2008. Field evidence that ecosystem service projects support biodiversity and diversify options. Proceedings of the National academy of Sciences of the United States of America 105: 9445–9448.CrossRefGoogle Scholar
  29. Greaves, T. 2002. Examining indigenous rights to culture in North America. Cultural Dynamics. 14: 121–142.CrossRefGoogle Scholar
  30. Gresh, T., J. Lichatowich, and P. Schoonmaker. 2000. An estimation of historic and current levels of salmon production in the Northeast Pacific ecosystem: Evidence of a nutrient deficit in the freshwater systems of the Pacific Northwest. Fisheries 25: 15–21.CrossRefGoogle Scholar
  31. Hahn, D.R. 2003. Alteration of microbial community composition and changes in decomposition associated with an invasive intertidal macrophyte. Biological Invasions 5: 45–51.CrossRefGoogle Scholar
  32. Hannan, L.B., J.D. Roth, L.M. Ehrhart, and J.F. Weishampel. 2007. Dune vegetation fertilization by nesting sea turtles. Ecology 88: 1053–1058.CrossRefGoogle Scholar
  33. Havik, G., A. Catenazzi, and M. Holmgren. 2014. Seabird nutrient subsidies benefit non-nitrogen fixing trees and alter species composition in South American coastal dry forests. Plos One 9.Google Scholar
  34. Heerhartz, S.M., M.N. Dethier, J.D. Toft, J.R. Cordell, and A.S. Ogston. 2014. Effects of shoreline armoring on beach wrack subsidies to the nearshore ecotone in an estuarine fjord. Estuaries and Coasts 37: 1256–1268.CrossRefGoogle Scholar
  35. Heerhartz, S.M., J.D. Toft, J.R. Cordell, M.N. Dethier, and A.S. Ogston. 2016. Shoreline armoring in an estuary constrains wrack-associated invertebrate communities. Estuaries and Coasts 39: 171–188.CrossRefGoogle Scholar
  36. Helfield, J.M., and R.J. Naiman. 2001. Effects of salmon-derived nitrogen on riparian forest growth and implications for stream productivity. Ecology 82: 2403–2409.CrossRefGoogle Scholar
  37. Hilderbrand, G.V., T.A. Hanley, C.T. Robbins, and C.C. Schwartz. 1999. Role of brown bears (Ursus arctos) in the flow of marine nitrogen into a terrestrial ecosystem. Oecologia 121: 546–550.CrossRefGoogle Scholar
  38. Hocking, M.D., and T.E. Reimchen. 2009. Salmon species, density and watershed size predict magnitude of marine enrichment in riparian food webs. Oikos 118: 1307–1318.CrossRefGoogle Scholar
  39. Hocking, M.D., R.A. Ring, and T.E. Reimchen. 2009. The ecology of terrestrial invertebrates on Pacific salmon carcasses. Ecological Research 24: 1091–1100.CrossRefGoogle Scholar
  40. Holtgrieve, G.W., and D.E. Schindler. 2011. Marine-derived nutrients, bioturbation, and ecosystem metabolism: Reconsidering the role of salmon in streams. Ecology 92: 373–385.CrossRefGoogle Scholar
  41. Ince, R., G.A. Hyndes, P.S. Lavery, and M.A. Vanderklift. 2007. Marine macrophytes directly enhance abundances of sandy beach fauna through provision of food and habitat. Estuarine, Coastal and Shelf Science 74: 77–86.CrossRefGoogle Scholar
  42. Jones, H.P., N.D. Holmes, S.H.M. Butchart, B.R. Tershy, P.J. Kappes, I. Corkery, A. Aguirre-Muñoz, D.P. Armstrong, et al. 2016. Invasive mammal eradication on islands, results in substantial conservation gains. Proceedings of the National Academy of Sciences of the United States of America 113: 4033–4038.CrossRefGoogle Scholar
  43. Knight, T.M., M.W. McCoy, J.M. Chase, K.A. McCoy, and R.D. Holt. 2005. Trophic cascades across ecosystems. Nature 437: 880–883.CrossRefGoogle Scholar
  44. Kohler, A.E., T.N. Pearsons, J.S. Zendt, M.G. Mesa, C.L. Johnson, and P.J. Connolly. 2012. Nutrient enrichment with Salmon Carcass analogs in the Columbia River basin, USA: A stream food Web analysis. Transactions of the American Fisheries Society 141: 802–824.CrossRefGoogle Scholar
  45. Krumhansl, K.A., J.-S. Lauzon-Guay, and R.E. Scheibling. 2014. Modeling effects of climate change and phase shifts on detrital production of a kelp bed. Ecology 95: 763–774.CrossRefGoogle Scholar
  46. Larsen, S., J.D. Muehlbauer, and E. Marti. 2016. Resource subsidies between stream and terrestrial ecosystems under global change. Global Change Biology 22: 2489–2504.CrossRefGoogle Scholar
  47. Lastra, M., J. Lopez, and G. Neves. 2015. Algal decay, temperature and body size influencing trophic behaviour of wrack consumers in sandy beaches. Marine Biology 162: 221–233.CrossRefGoogle Scholar
  48. Leroux, S.J., and M. Loreau. 2008. Subsidy hypothesis and strength of trophic cascades across ecosystems. Ecology Letters 11: 1147–1156.CrossRefGoogle Scholar
  49. Levin, P.S., R.W. Zabel, and J.G. Williams. 2001. The road to extinction is paved with good intentions: Negative association of fish hatcheries with threatened salmon. Proceedings of the Royal Society B-Biological Sciences 268: 1153–1158.CrossRefGoogle Scholar
  50. Lewis, T.M., and D.J.R. Lafferty. 2014. Brown bears and wolves scavenge humpback whale carcass in Alaska. Ursus 25: 8–13.CrossRefGoogle Scholar
  51. Lewison, R.L., L.B. Crowder, A.J. Read, and S.A. Freeman. 2004. Understanding impacts of fisheries bycatch on marine megafauna. Trends in Ecology & Evolution 19: 598–604.CrossRefGoogle Scholar
  52. Lewison, R.L., L.B. Crowder, B.P. Wallace, J.E. Moore, T. Cox, R. Zydelis, S. McDonald, A. DiMatteo, et al. 2014. Global patterns of marine mammal, seabird, and sea turtle bycatch reveal taxa-specific and cumulative megafauna hotspots. Proceedings of the National Academy of Sciences of the United States of America 111: 5271–5276.CrossRefGoogle Scholar
  53. Liebowitz, D.M., K.J. Nielsen, J.E. Dugan, S.G. Morgan, D.P. Malone, J.L. Largier, D.M. Hubbard, and M.H. Carr. 2016. Ecosystem connectivity and trophic subsidies of sandy beaches. Ecosphere 7.Google Scholar
  54. Maron, J.L., J.A. Estes, D.A. Croll, E.M. Danner, S.C. Elmendorf, and S.L. Buckelew. 2006. An introduced predator alters Aleutian Island plant communities by thwarting nutrient subsidies. Ecological Monographs 76: 3–24.CrossRefGoogle Scholar
  55. Martins da Silva, L.G., L.B. Nogueira, B.P. Maia, and L.B. de Resende. 2012. Fish passage post-construction issues: Analysis of distribution, attraction and passage efficiency metrics at the Baguari Dam fish ladder to approach the problem. Neotropical Ichthyology 10: 751–762.CrossRefGoogle Scholar
  56. Massol, F., D. Gravel, N. Mouquet, M.W. Cadotte, T. Fukami, and M.A. Leibold. 2011. Linking community and ecosystem dynamics through spatial ecology. Ecology Letters 14: 313–323.CrossRefGoogle Scholar
  57. McLoughlin, P.D., K. Lysak, L. Debeffe, T. Perry, and K.A. Hobson. 2016. Density-dependent resource selection by a terrestrial herbivore in response to sea-to-land nutrient transfer by seals. Ecology 97: 1929–1937.CrossRefGoogle Scholar
  58. Mellbrand, K., P.S. Lavery, G. Hyndes, and P.A. Hamback. 2011. Linking land and sea: Different pathways for marine subsidies. Ecosystems 14: 732–744.CrossRefGoogle Scholar
  59. Moore, J.E., B.P. Wallace, R.L. Lewison, R. Zydelis, T.M. Cox, and L.B. Crowder. 2008. A review of marine mammal, sea turtle and seabird bycatch in USA fisheries and the role of policy in shaping management. Marine Policy 33: 435–451.CrossRefGoogle Scholar
  60. Muehlbauer, J.D., S.F. Collins, M.W. Doyle, and K. Tockner. 2014. How wide is a stream? Spatial extent of the potential “stream signiture” in terrestrial food webs using meta-analysis. Ecology 95: 44–55.CrossRefGoogle Scholar
  61. Munsch, S.H., J.R. Cordell, and J.D. Toft. 2015. Effects of shoreline engineering on shallow subtidal fish and crab communities in an urban estuary: A comparison of armored shorelines and nourished beaches. Ecological Engineering 81: 312–320.CrossRefGoogle Scholar
  62. Nehlsen, W. 1994. Salmon stocks at risk: Beyond 214. Conservation Biology 8: 867–869.CrossRefGoogle Scholar
  63. Nehlsen, W., J.E. Williams, and J.A. Lichatowich. 1991. Pacific Salmon at the crossroads—Stocks at risk from california, Oregon, Idaho, and Washington. Fisheries 16: 4–21.CrossRefGoogle Scholar
  64. Orr, M., M. Zimmer, D.E. Jelinski, and M. Mews. 2005. Wrack deposition on different beach types: Spatial and temporal variation in the pattern of subsidy. Ecology 86: 1496–1507.CrossRefGoogle Scholar
  65. Parsons, E.C.M., S.J. Dolman, A.J. Wright, N.A. Rose, and W.C.G. Burns. 2008. Navy sonar and cetaceans: Just how much does the gun need to smoke before we act? Marine Pollution Bulletin 56: 1248–1257.CrossRefGoogle Scholar
  66. Pess, G.R., M.L. McHenry, T.J. Beechie, and J. Davies. 2008. Biological impacts of the Elwha River dams and potential salmonid responses to dam removal. Northwest Science 82: 72–90.CrossRefGoogle Scholar
  67. Plummer, M.L., C.J. Harvey, L.E. Anderson, A.D. Guerry, and M.H. Ruckelshaus. 2013. The role of eelgrass in marine community interactions and ecosystem services: Results from ecosystem-scale food Web models. Ecosystems 16: 237–251.CrossRefGoogle Scholar
  68. Polis, G.A., and S.D. Hurd. 1996. Linking marine and terrestrial food webs: Allochthonous input from the ocean supports high secondary productivity on small islands and coastal land communities. American Naturalist 147: 396–423.CrossRefGoogle Scholar
  69. Polis, G.A., W.B. Anderson, and R.D. Holt. 1997. Toward an integration of landscape and food web ecology: The dynamics of spatially subsidized food webs. Annual Review of Ecology and Systematics 28: 289–316.CrossRefGoogle Scholar
  70. Puth, L.M., and K.A. Wilson. 2001. Boundaries and corridors as a continuum of ecological flow control: Lessons from rivers and streams. Conservation Biology 15: 21–30.CrossRefGoogle Scholar
  71. Richardson, J.S., and T. Sato. 2015. Resource subsidy flows across freshwater-terrestrial boundaries and influence on processes linking adjacent ecosystems. Ecohydrology 8: 406–415.CrossRefGoogle Scholar
  72. Richerson, K., and D.S. Holland. 2017. Quantifying and predicting responses to a US West Coast salmon fishery closure. ICES Journal of Marine Science.Google Scholar
  73. Rodil, I.F., P. Lucena-Moya, C. Olabarria, and F. Arenas. 2015. Alteration of macroalgal subsidies by climate-associated stressors affects behavior of wrack-reliant beach consumers. Ecosystems 18: 428–440.CrossRefGoogle Scholar
  74. Roni, P., T.J. Beechie, R.E. Bilby, F.E. Leonetti, M.M. Pollock, and G.R. Pess. 2002. A review of stream restoration techniques and a hierarchical strategy for prioritizing restoration in Pacific northwest watersheds. North American Journal of Fisheries Management 22: 1–20.CrossRefGoogle Scholar
  75. Ruckelshaus, M.H., P. Levin, J.B. Johnson, and P.M. Kareiva. 2002. The Pacific salmon wars: What science brings to the challenge of recovering species. Annual Review of Ecology and Systematics 665–706.Google Scholar
  76. Safford, T.G., K.C. Norman, M. Henly, K.E. Mills, and P.S. Levin. 2014. Environmental awareness and public support for protecting and restoring puget sound. Environmental Management 53: 757–768.CrossRefGoogle Scholar
  77. Schindler, D.E., M.D. Scheuerell, J.W. Moore, S.M. Gende, T.B. Francis, and W.J. Palen. 2003. Pacific salmon and the ecology of coastal ecosystems. Frontiers in Ecology and the Environment 1: 31–37.CrossRefGoogle Scholar
  78. Schindler, D.E., R. Hilborn, B. Chasco, C.P. Boatright, T.P. Quinn, L.A. Rogers, and M.S. Webster. 2010. Population diversity and the portfolio effect in an exploited species. Nature 465: 609–612.CrossRefGoogle Scholar
  79. Schulz, R., M. Bundschuh, R. Gergs, C.A. Bruhl, D. Diehl, M.H. Entling, L. Fahse, et al. 2015. Review on environmental alterations propagating from aquatic to terrestrial ecosystems. Science of the Total Environment 538: 246–261.CrossRefGoogle Scholar
  80. Scyphers, S.B., J.S. Picou, and S.P. Powers. 2014. Participatory conservation of coastal habitats: The importance of understanding homeowner decision making to mitigate cascading shoreline degradation. Conservation Letters 8: 41–49.CrossRefGoogle Scholar
  81. Senko, J., A.J. Schneller, J. Solis, F. Ollervides, and W.J. Nichols. 2011. People helping turtles, turtles helping people: Understanding resident attitudes toward sea turtle conservation and opportunities for enhanced community participation in Bahia Magdalena, Mexico. Ocean and Coastal Management 54: 148–157.CrossRefGoogle Scholar
  82. Service, U. S. F. a. W. 1993. Grizzly Bear Recovery Plan. Missoula: MT, University of Montana.Google Scholar
  83. Smith, R.K., A.S. Pullin, G.B. Stewart, and W.J. Sutherland. 2010. Effectiveness of predator removal for enhancing bird populations. Conservation Biology 24: 820–829.CrossRefGoogle Scholar
  84. Soininen, J., P. Bartels, J. Heino, M. Luoto, and H. Hillebrand. 2015. Toward more integrated ecosystem research in aquatic and terrestrial environments. BioScience 65: 174–182.CrossRefGoogle Scholar
  85. Stanley, E.H., and M.W. Doyle. 2003. Trading off: The ecological removal effects of dam removal. Frontiers in Ecology and the Environment 1: 15–22.CrossRefGoogle Scholar
  86. Thomas, S.M., S.W. Griffiths, and S.J. Ormerod. 2015. Adapting streams for climate change using riparian broadleaf trees and its consequences for stream salmonids. Freshwater Biology 60: 64–77.CrossRefGoogle Scholar
  87. Tisdell, C., and C. Wilson. 2001. Wildlife-based tourism and increased support for nature conservation financially and otherwise: Evidence from sea turtle ecotourism at Mon Repos. Tourism Economics 7: 233–249.CrossRefGoogle Scholar
  88. Toft, J.D., J.R. Cordell, and E.A. Armbrust. 2014. Shoreline armoring impacts and beach restoration effectiveness vary with elevation. Northwest Science 88: 367–375.CrossRefGoogle Scholar
  89. VanderWerf, E.A., L.C. Young, S.E. Crow, E. Opie, H. Yamazaki, C.J. Miller, D.G. Anderson, L.S. Brown, et al. 2014. Increase in wedge-tailed shearwaters and changes in soil nutrients following removal of alien mammalian predators and nitrogen-fixing plants at Kaena Point. Hawaii. Restoration Ecology 22: 676–684.CrossRefGoogle Scholar
  90. Vitousek, P.M., H.A. Mooney, J. Lubchenco, and J.M. Melillo. 1997. Human Domination of Earth’s Ecosystems Science 277: 494–499.Google Scholar
  91. Wilson, C., and C. Tisdell. 2001. Sea turtles as a non-consumptive tourism resource especially in Australia. Tourism Management 22: 279–288.CrossRefGoogle Scholar
  92. Witherington, B.E., and R.E. Martin. 2000. Understanding, assessing, and resolving light-pollution problems on sea turtle nesting beaches.Google Scholar
  93. Wolf, S., B. Keitt, A. Aguirre-Munoz, B. Tershy, E. Palacios, and D. Croll. 2006. Transboundary seabird conservation in an important North American marine ecoregion. Environmental Conservation 33: 294–305.CrossRefGoogle Scholar
  94. Young, H.S., D.J. McCauley, R.B. Dunbar, and R. Dirzo. 2010. Plants cause ecosystem nutrient depletion via the interruption of bird-derived spatial subsidies. Proceedings of the National academy of Sciences of the United States of America 107: 2072–2077.CrossRefGoogle Scholar

Copyright information

© Royal Swedish Academy of Sciences 2017

Authors and Affiliations

  1. 1.Department of BiologyCarleton CollegeNorthfieldUSA
  2. 2.Conservation Biology DivisionNorthwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric AdministrationSeattleUSA
  3. 3.SeattleUSA

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