Vulnerability of fish and macroinvertebrates to key threats in streams of the Kakadu region, northern Australia: assemblage dynamics, existing assessments and knowledge needs
Chris L. Humphrey A D , Keith A. Bishop B and Peter L. Dostine C
+ Author Affiliations
- Author Affiliations
A Supervising Scientist Branch, Department of the Environment and Energy, GPO Box 461, Darwin, NT 0801, Australia.
B Aquatic Ecologist, 122 Sugar Creek Road, Bungwahl, NSW 2423, Australia.
C Department of Environment and Natural Resources, PO Box 496, Palmerston, NT 0831, Australia.
D Corresponding author. Email: chris.humphrey@environment.gov.au
Marine and Freshwater Research 69(7) 1092-1109 https://doi.org/10.1071/MF16175
Submitted: 11 May 2016 Accepted: 18 October 2016 Published: 22 December 2016
Abstract
By 2100, it is predicted that streams in the Kakadu region in Northern Australia will be transforming in their coastal floodplains to saline environments because of sea-level rise. Potential impacts need to be assessed, together with existing threats, to manage future change. The fish and macroinvertebrate assemblages of the streams in the region are well researched and were used as indicators to assess centennial-scale changes to freshwaters. Spatial and temporal patterns in assemblage dynamics were described using data from different habitat types, and used as a framework to review current knowledge and assemblage vulnerability for likely conditions ≥100 years from present-day. Twenty threats within three broad classes were identified (climate change, invasive species, decommissioning and rehabilitation of Ranger uranium mine). Seven threatening processes were ranked as high risk to catchment-scale distributions of fish and macroinvertebrate taxa, with six being associated with climate change and one with mine-site rehabilitation. Habitat connectivities and dependencies were identified as key ecological processes for both groups, with saltwater intrusion to coastal floodplains being identified as the major process that will alter assemblage dynamics and system energy flow. Risks posed by climate change highlighted priority research and monitoring needs for management and protection of upland freshwater-refuge habitats.
Additional keywords: climate change, invasive species, key knowledge needs, mining impact.
References
AECOM (2010). ‘Research of Key Knowledge Gaps in the Ecological Character of the Cobourg Peninsula Ramsar Site, Northern Territory: Aquatic Flora and Fauna and Physicochemical Assessment.’ Prepared for the Australian Government, Canberra, ACT, Australia.Andersen, A. N., Cook, G. D., Corbett, L. K., Douglas, M. M., Eager, R. W., Russell-Smith, J., Setterfield, S. A., Williams, R. J., and Woinarski, J. C. Z. (2005). Fire frequency and biodiversity conservation in Australian tropical savannas: implications from the Kapalga fire experiment. Austral Ecology 30, 155–167.
| Fire frequency and biodiversity conservation in Australian tropical savannas: implications from the Kapalga fire experiment.Crossref | GoogleScholarGoogle Scholar |
Andersen, A. N., Humphrey, C. L., and Braby, M. F. (2013). Threatened invertebrates in Kakadu National Park. In ‘Kakadu National Park Landscape Symposia Series. Symposium 7: Conservation of Threatened Species’, 26–27 March 2013, Jabiru, NT, Australia. (Eds S. Winderlich and J Woinarski.) pp. 48–57. Internal report 623. Supervising Scientist, Darwin, NT, Australia.
Anderson, M. J., Gorley, R. N., and Clarke, K. R. (2008). ‘PERMANOVA for PRIMER: Guide to Software and Statistical Methods.’ (PRIMER-E Ltd.: Plymouth, UK)
Bartolo, R., Paulka, S., van Dam, R., Iles, S., and Harford, A. (2013). Rehabilitation and closure ecological risk assessment for Ranger uranium mine: documentation of initial problem formulation activities. Internal report 624, November, Supervising Scientist, Darwin.
Bayliss, B., Brennan, K., Eliot, I., Finlayson, M., Hall, R., House, T., Pidgeon, B., Walden, D., and Waterman, P. (1997). Vulnerability assessment of predicted climate change and sea level rise in the Alligator Rivers region, Northern Territory Australia. Supervising Scientist report 123, Supervising Scientist, Canberra, ACT, Australia.
Bayliss, P., Dutra, L. X. C., and Melo, L. F. C. (2015). Risks from sea level rise due to climate change. In ‘Part I Managing Threats to Floodplain Biodiversity and Cultural Values on Kakadu National Park’. pp. 14–206. (CSIRO: Brisbane, Qld, Australia.) Available at https://publications.csiro.au/rpr/download?pid=csiro:EP152591&dsid=DS4 [Verified 14 November 2016].
Bayliss, P., Saunders, K., Dutra, L. X. C., Hilton, J., Melo, L. F. C., Woolard, F., and Prakash, M. (2018). Assessing sea level rise risks to coastal floodplains in the Kakadu region, northern Australia, using a tidally driven hydrodynamic model. Marine and Freshwater Research 69, 1064–1078.
| Assessing sea level rise risks to coastal floodplains in the Kakadu region, northern Australia, using a tidally driven hydrodynamic model.Crossref | GoogleScholarGoogle Scholar |
Bishop, K. A. (1987). Dynamics of the freshwater fish communities of the Alligator Rivers region, tropical northern Australia. Ph.D. Thesis, Macquarie University, Sydney, NSW, Australia.
Bishop, K. A. (2014). Opportunistic diver-based mid-dry-season re-censusing of freshwater fish assemblages in two streams within Kakadu National Park: is there any evidence of impacts arising from cane toads? Report to Parks North (Kakadu National Park) and the Environmental Research Institute of the Supervising Scientist (Commonwealth Department of the Environment), November 2014.
Bishop, K. A., and Forbes, M. A. (1991). Freshwater fishes of north Australia. In ‘Monsoonal Australia: Landscape, Ecology and Man’. (Eds C. D. Haynes, M. G. Ridpath, and M. A. J. Williams.) pp. 79–107. (A.A. Balkema: Rotterdam, Netherlands.)
Bishop, K. A., Allen, S. A., Pollard, D. A., and Cook, M. G. (1986). Ecological studies on the freshwater fishes of the Alligator Rivers region, Northern Territory. Research report 4, volume 1. Outline of study, summary, conclusions and recommendations. Supervising Scientist for the Alligator Rivers region. Australian Government Publishing Service, Canberra, ACT, Australia.
Bishop, K. A., Allen, S. A., Pollard, D. A., and Cook, M. G. (1990). Ecological studies on the freshwater fishes of the Alligator Rivers region, Northern Territory. Research report 4, volume II. Synecological studies. Supervising Scientist for the Alligator Rivers region. Australian Government Publishing Service, Canberra, ACT, Australia.
Bishop, K. A., Pidgeon, R. W. J., and Walden, D. J. (1995). Studies on fish movement dynamics in a tropical floodplain river: prerequisites for a procedure to monitor the impacts of mining. Australian Journal of Ecology 20, 81–107.
| Studies on fish movement dynamics in a tropical floodplain river: prerequisites for a procedure to monitor the impacts of mining.Crossref | GoogleScholarGoogle Scholar |
Bishop, K. A., Allen, S. A., Pollard, D. A., and Cook, M. G. (2001). Ecological studies on the freshwater fishes of the Alligator Rivers region, Northern Territory. Research report 4, volume III. Autecological studies. Supervising Scientist for the Alligator Rivers region. Australian Government Publishing Service, Canberra, ACT, Australia.
Boustead, A. (2009). A review of the potential impacts of climate change upon Kakadu wetlands. MTEMR Thesis, Charles Darwin University, Darwin, NT, Australia.
Brown, T. E., Morley, A. W., Sanderson, N. T., and Tait, R. D. (1983). Report of a large fish kill resulting from natural acid water conditions in Australia. Journal of Fish Biology 22, 335–350.
| Report of a large fish kill resulting from natural acid water conditions in Australia.Crossref | GoogleScholarGoogle Scholar |
Cai, W., Borlace, S., Lengaigne, M., van Rensch, P., Collins, M., Vecchi, G., Timmermann, A., Santoso, A., McPhaden, M. J., Wu, L., England, M. H., Wang, G., Guilyardi, E., and Jin, F. F. (2014). Increasing frequency of extreme El Niño events due to greenhouse warming. Nature Climate Change 4, 111–116.
| Increasing frequency of extreme El Niño events due to greenhouse warming.Crossref | GoogleScholarGoogle Scholar |
Cai, W., Wang, G., Santoso, A., McPhaden, M. J., Wu, L., Jin, F. F., Timmermann, A., Collins, M., Vecchi, G., Lengaigne, M., England, M. H., Dommenget, D., Takahashi, K., and Guilyardi, E. (2015). Increased frequency of extreme La Niña events under greenhouse warming. Nature Climate Change 5, 849–859.
| Increased frequency of extreme La Niña events under greenhouse warming.Crossref | GoogleScholarGoogle Scholar |
Clarke, K. R., and Gorley, R. N. (2015). ‘PRIMER v7: User Manual/Tutorial.’ (PRIMER-E, Plymouth, UK.)
Cobb, S. M., Saynor, M. J., Eliot, M., Eliot, I., and Hall, R. (2007). Saltwater intrusion and mangrove encroachment of coastal wetlands in the Alligator Rivers region, Northern Territory, Australia. Supervising Scientist report 191. Supervising Scientist, Darwin, NT, Australia.
Davies, P. E. (2000). Development of a national river bioassessment system (AUSRIVAS) in Australia. In ‘Assessing the Biological Quality of Fresh Waters: RIVPACS and Other Techniques’. (Eds. J.F. Wright, D.W. Sutcliffe, and M.T. Furse) pp. 113–124. (Freshwater Biological Association: Ambleside, UK.)
DeConto, R. M., and Pollard, D. (2016). Contribution of Antarctica to past and future sea-level rise. Nature 531, 591–597.
| Contribution of Antarctica to past and future sea-level rise.Crossref | GoogleScholarGoogle Scholar |
Dostine, P. L., and Humphrey, C. L. (2012). ‘Macroinvertebrate Responses to Reduced Baseflow in a Stream in the Monsoonal Tropics of Northern Australia.’ (National Water Commission: Canberra, ACT, Australia.)
Dostine, P. L., and Morton, S. R. (1989). Feeding ecology of the whiskered tern, Chlidonias hybrida, in the Alligator Rivers region, Northern Territory. Australian Wildlife Research 16, 549–562.
| Feeding ecology of the whiskered tern, Chlidonias hybrida, in the Alligator Rivers region, Northern Territory.Crossref | GoogleScholarGoogle Scholar |
Douglas, M. M., and O’Connor, R. A. (2003). Effects of the exotic macrophyte, para grass (Urochloa mutica), on benthic and epiphytic macroinvertebrates of a tropical floodplain. Freshwater Biology 48, 962–971.
| Effects of the exotic macrophyte, para grass (Urochloa mutica), on benthic and epiphytic macroinvertebrates of a tropical floodplain.Crossref | GoogleScholarGoogle Scholar |
Douglas, M. M., Bunn, S. E., Pidgeon, R. J. W., Davies, P. M., Barrow, P., O’Connor, R. A., and Winning, M. (2001). Weed management and the biodiversity and ecological processes of tropical wetlands. Draft final report to National Wetlands R & D Program Environment Australia & Land and Water Australia, Canberra, ACT, Australia.
ERA (2014). Ranger 3 Deeps Draft Environmental Impact Statement. Appendix 9. Solute Egress Modelling for ERA Ranger 3 Deeps Mine Closure. (Energy Resources of Australia: Jabiru, NT, Australia.) Available at http://www.energyres.com.au/uploads/general/Appendix_09_Solute_Egress_Modelling_for_ERA_Ranger_3_Deeps_mine_closure.pdf [Verified 31 March 2016].
Faith, D. P., Dostine, P. L., and Humphrey, C. L. (1995). Detection of mining impacts on aquatic macroinvertebrate communities: results of a disturbance experiment and the design of a multivariate BACIP monitoring programme at Coronation Hill, Northern Territory. Australian Journal of Ecology 20, 167–180.
| Detection of mining impacts on aquatic macroinvertebrate communities: results of a disturbance experiment and the design of a multivariate BACIP monitoring programme at Coronation Hill, Northern Territory.Crossref | GoogleScholarGoogle Scholar |
Garcia, E., Dostine, P., Humphrey, C., Douglas, M., Pusey, B., and Cook, B. (2011). Aquatic invertebrates. In ‘Aquatic Biodiversity in Northern Australia: Patterns, Threats and Future’. (Ed. B. J. Pusey.) pp. 51–70. (Charles Darwin University Press: Darwin, NT, Australia.)
Gooderham, J., and Tsyrlin, E. (2002). ‘The Waterbug Book: a Guide to the Freshwater Macroinvertebrates of Temperate Australia.’ (CSIRO Publishing: Melbourne, Vic., Australia.)
Humphrey, C. L., and Dostine, P. (1994). Development of biological monitoring programs to detect mining waste impacts upon aquatic ecosystems of the Alligator Rivers region, Northern Territory, Australia. Mitteilungen Internationalis Vereinigung Limnologie 24, 293–314.
Humphrey, C. L., and Simpson, R. D. (1985). The biology and ecology of Velesunio angasi (Bivalvia: Hydiidae) in the Magela Creek, Northern Territory (4 parts). Open file record 38. Supervising Scientist for the Alligator Rivers Region, Canberra, ACT, Australia.
Humphrey, C. L., Bishop, K. A., and Brown, V. M. (1990). Use of biological monitoring in the assessment of effects of mining wastes on aquatic ecosystems of the Alligator Rivers region, tropical northern Australia. Environmental Monitoring and Assessment 14, 139–181.
| Use of biological monitoring in the assessment of effects of mining wastes on aquatic ecosystems of the Alligator Rivers region, tropical northern Australia.Crossref | GoogleScholarGoogle Scholar |
Humphrey, C. L., Storey, A. W., and Thurtell, L. (2000). AUSRIVAS: operator sample processing errors and temporal variability – implications for model sensitivity. In ‘Assessing the Biological Quality of Fresh Waters. RIVPACS and Other Techniques’. (Eds J. F. Wright, D. W. Sutcliffe, and M. T. Furse.) pp. 143–163. (Freshwater Biological Association: Ambleside, UK.)
Humphrey, C. L., van Dam, R. A., Storey, A., Chandler, L., Hogan, A. C., and Buckle, D. (2008). Assessment of the effects of MgSO4-rich wastewater discharges from Argyle diamond mine on downstream aquatic ecosystems: synthesis of a three-year (2006–08) study. Commercial in confidence report to Argyle Diamonds, Supervising Scientist, Darwin, NT, Australia.
Kyne, P., and Dostine, P. (2011). Birds. In ‘Aquatic Biodiversity in Northern Australia: Patterns, Threats and Future’. (Ed. B. J. Pusey.) pp. 111–113. (Charles Darwin University Press: Darwin, NT, Australia.)
Lowe-McConnell, R. H. (1987). ‘Ecological Studies in Tropical Fish Communities.’ (Cambridge University Press: Cambridge, UK.)
Nanson, G., East, T., Roberts, R., Clark, R., and Murray, A. (1990). Quaternary evolution and landform stability of Magela Creek catchment, near the Ranger uranium mine, northern Australia. Open file record 63. Supervising Scientist for the Alligator Rivers region, Canberra, ACT, Australia.
National Environmental Research Program, Northern Hub (2015). Freshwater fishes of Kakadu National Park and the impact of sea level rise. Available at http://www.nespnorthern.edu.au/wp-content/uploads/2015/10/3.3_kakadu_freshwater_fishes_fact_sheet_web.pdf [Verified 11 December 2015].
NCCARF (2013). National Climate Change Adaptation Research Facility policy guidance brief 8. Adapting ecosystems to climate change. Available at https://www.nccarf.edu.au/sites/default/files/attached_files_publications/ECOSYSTEMS_A4-Webview.pdf [Verified 31 March 2016].
Paltridge, R. M., Dostine, P. L., Humphrey, C. L., and Boulton, A. J. (1997). Macroinvertebrate recolonisation after re-wetting of a tropical seasonally flowing stream (Magela Creek, Northern Territory, Australia). Marine and Freshwater Research 48, 633–645.
| Macroinvertebrate recolonisation after re-wetting of a tropical seasonally flowing stream (Magela Creek, Northern Territory, Australia).Crossref | GoogleScholarGoogle Scholar |
Pusey, B., Warfe, D., Townsend, S., Douglas, M., Burrows, D., Kennard, M. J., and Close, P. (2011). Condition, impacts and threats to aquatic biodiversity. In ‘Aquatic Biodiversity in Northern Australia: Patterns, Threats and Future’. (Ed. B. J. Pusey.) pp. 151–172. (Charles Darwin University Press: Darwin, NT, Australia.)
Shine, R. (2010). The ecological impact of invasive cane toads (Bufo Marinus) in Australia. The Quarterly Review of Biology 85, 253–291.
| The ecological impact of invasive cane toads (Bufo Marinus) in Australia.Crossref | GoogleScholarGoogle Scholar |
Short, J. W., Humphrey, C. L., and Page, T. J. (2013). Systematic revision and reappraisal of the Kakaducarididae Bruce (Crustacea: Decapoda: Caridea) with the description of three new species of Leptopalaemon Bruce & Short. Invertebrate Systematics 27, 87–117.
| Systematic revision and reappraisal of the Kakaducarididae Bruce (Crustacea: Decapoda: Caridea) with the description of three new species of Leptopalaemon Bruce & Short.Crossref | GoogleScholarGoogle Scholar |
Solomon, S., Qin, D., Manning, M., Chen, Z., Marquis, M., Averyt, K. B., Tignor, M., and Miller, H. L. (Eds) (2007). ‘Climate Change 2007: the Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change.’ (Cambridge University Press: Cambridge, UK, and New York, NY, USA.)
Supervising Scientist (2005). Annual report 2004–2005. Supervising Scientist, Darwin, NT, Australia.
Supervising Scientist (2007). Annual report 2006–2007. Supervising Scientist, Darwin, NT, Australia.
Supervising Scientist (2013). Annual report 2012–2013. Supervising Scientist, Darwin, NT, Australia.
Supervising Scientist (2015). Annual report 2014–15. Commonwealth of Australia, Canberra, ACT, Australia.
Supervising Scientist Division (2011a). Environmental monitoring protocols to assess potential impacts from Ranger minesite on aquatic ecosystems: fish community structure in channel billabongs. Internal report 590. Supervising Scientist, Darwin, NT, Australia.
Supervising Scientist Division (2011b). Environmental monitoring protocols to assess potential impacts from Ranger minesite on aquatic ecosystems: fish community structure in shallow lowland billabongs. Internal report 589. Supervising Scientist, Darwin, NT, Australia.
Supervising Scientist Division (2013). Environmental monitoring protocols to assess potential impacts from Ranger minesite on aquatic ecosystems: macroinvertebrate community structure in streams. Internal report 591. Supervising Scientist, Darwin, NT, Australia.
Suter, P. J. (2001). Platybaetis gagadjuensis, a new species from northern Australia (Ephemeroptera: Batidae). In ‘Trends in Research in Ephemeroptera and Plecoptera’. (Ed. D. E. Dominguez.) pp 359–364. (Kluwer Academics/Plenum Press: New York, NY, USA.)
Tooth, S., Jansen, J. D., Nanson, G. C., Coulthard, T. J., and Pietsch, T. (2008). Riparian vegetation and the late Holocene development of an anabranching river: Magela Creek, northern Australia. Geological Society of America Bulletin 120, 1021–1035.
| Riparian vegetation and the late Holocene development of an anabranching river: Magela Creek, northern Australia.Crossref | GoogleScholarGoogle Scholar |
van Dam, R. A., Walden, D. J., and Begg, G. W. (2002). A preliminary risk assessment of cane toads in Kakadu National Park. Supervising Scientist report 164. Supervising Scientist, Darwin, NT, Australia.
van Dam, R. A., Hogan, A. C., McCullough, C. D., Houston, M. A., Humphrey, C. L., and Harford, A. J. (2010). Aquatic toxicity of magnesium sulphate, and the influence of calcium, in very low ionic concentration water. Environmental Toxicology and Chemistry 29, 410–421.
| Aquatic toxicity of magnesium sulphate, and the influence of calcium, in very low ionic concentration water.Crossref | GoogleScholarGoogle Scholar |
van Dam, R. A., Humphrey, C. L., Harford, A. J., Sinclair, A., Jones, D. R., Davies, S., and Storey, A. W. (2014). Site-specific water quality guidelines: 1. Derivation approaches based on physicochemical, ecotoxicological and ecological data. Environmental Science and Pollution Research International 21, 118–130.
| Site-specific water quality guidelines: 1. Derivation approaches based on physicochemical, ecotoxicological and ecological data.Crossref | GoogleScholarGoogle Scholar |
Walden, D. J., and Nou, S. (Eds) (2008). Kakadu National Park landscape symposia series 2007–2009. Symposium 1: landscape change overview, 17–18 April 2007, South Alligator Inn, Kakadu National Park. Internal report 532. Supervising Scientist, Darwin, NT, Australia.
Webb, J. M., and Suter, P. J. (2011). Identification of larvae of Australian Baetidae. Museum Victoria Science Reports 15, 1–24.
Welcomme, R. L. (1979). ‘Fisheries Ecology of Floodplain Rivers.’ (Longman: London, UK.)
Wilson, G. D. F., Humphrey, C. L., Colgan, D. J., Gray, K., and Johnson, R. N. (2009). Monsoon-influenced speciation patterns in a species flock of Eophreatoicus Nicholls (Isopoda; Crustacea). Molecular Phylogenetics and Evolution 51, 349–364.
| Monsoon-influenced speciation patterns in a species flock of Eophreatoicus Nicholls (Isopoda; Crustacea).Crossref | GoogleScholarGoogle Scholar |
Woinarski, J. C. Z., and Winderlich, S. (2014). A strategy for the conservation of threatened species and threatened ecological communities in Kakadu National Park 2014–2024. Charles Darwin University, Darwin, NT, Australia.
