Managing flows for frogs: wetland inundation extent and duration promote wetland-dependent amphibian breeding success
J. F. Ocock
A B * , A. Walcott C , J. Spencer B C , S. Karunaratne D , R. F. Thomas B E , J. T. Heath C and D. Preston F
A
B
C
D
E
F
Abstract
River regulation is a key threat to amphibian communities that continue to face global declines. Prior work in regulated river catchments has indicated that wetland inundation from connecting river flows supports breeding in some frog species more than others.
Our aim was to identify flow metrics influencing breeding and recruitment success in flow-dependent frogs, to derive flow–ecology relationships.
We conducted repeat surveys of frog communities between 2015 and 2020 across two important wetlands in the northern Murray–Darling Basin, Australia. Using random forest analyses, we investigated the influence of 22 explanatory variables on breeding activity and success.
Inundation extent was the most important driver of calling activity by flow-dependent species (increasing breeding attempts), whereas the volume of river flows in the preceding months was most important for increasing breeding success.
Two key features of the flow pulse are linked to breeding success for amphibians in floodplain wetland systems: (1) the size of the pulse as it relates to area of wetland inundated; and (2) the duration of connecting flows as a measure of wetland duration.
By establishing amphibian flow–ecology relationships, these species can be included in governmental environmental water objectives and management.
Keywords: environmental water, flow-dependent, frog conservation, Limnodynastes, Litoria, monitoring, Murray–Darling Basin, random forests.
References
Acreman MC, Overton IC, King J, Wood PJ, Cowx IG, Dunbar MJ, Kendy E, Young WJ (2014) The changing role of ecohydrological science in guiding environmental flows. Hydrological Sciences Journal 59, 433-450.
| Crossref | Google Scholar |
Arthington AH, Pusey BJ (2003) Flow restoration and protection in Australian rivers. River Research and Applications 19, 377-395.
| Crossref | Google Scholar |
Arthington AH, Kennen JG, Stein ED, Webb JA (2018) Recent advances in environmental flows science and water management – innovation in the Anthropocene. Freshwater Biology 63, 1022-1034.
| Crossref | Google Scholar |
Australian Government (2012) Basin Plan 2012: made under subparagraph 44(3)(b)(i) of the Water Act 2007. Available at https://www.legislation.gov.au/Details/F2012L02240
Bateman HL, Harner MJ, Chung-MacCoubrey A (2008) Abundance and reproduction of toads (Bufo) along a regulated river in the southwestern United States: importance of flooding in riparian ecosystems. Journal of Arid Environments 72, 1613-1619.
| Crossref | Google Scholar |
Berney P, Hosking T (2016) Opportunities and challenges for water-dependent protected area management arising from water management reform in the Murray–Darling Basin: a case study from the Macquarie Marshes in Australia. Aquatic Conservation: Marine and Freshwater Ecosystems 26, 12-28.
| Crossref | Google Scholar |
Bino G, Wassens S, Kingsford RT, Thomas RF, Spencer J (2018) Floodplain ecosystem dynamics under extreme dry and wet phases in semi-arid Australia. Freshwater Biology 63, 224-241.
| Crossref | Google Scholar |
Brandis KJ, Kingsford RT, Ren S, Ramp D (2011) Crisis water management and ibis breeding at Narran Lakes in arid Australia. Environmental Management 48, 489-498.
| Crossref | Google Scholar | PubMed |
Breiman L (2001) Random forests. Machine Learning 45, 5-32.
| Crossref | Google Scholar |
Bren LJ (1988) Effects of river regulation on flooding of a riparian red gum forest on the River Murray, Australia. Regulated Rivers: Research & Management 2, 65-77.
| Crossref | Google Scholar |
Brown C, Campher D, King J (2020) Status and trends in EFlows in southern Africa. Natural Resources Forum 44, 66-88.
| Crossref | Google Scholar |
Bunn SE, Arthington AH (2002) Basic principles and ecological consequences of altered flow regimes for aquatic biodiversity. Environmental Management 30, 492-507.
| Crossref | Google Scholar | PubMed |
Bureau of Meterology (2020) Annual climate statement 2019. (BOM) Available at http://www.bom.gov.au/climate/current/annual/aus/2019/ [Verified 7 September 2023]
Casanova MT, Brock MA (2000) How do depth, duration and frequency of flooding influence the establishment of wetland plant communities? Plant Ecology 147, 237-250.
| Crossref | Google Scholar |
Catenazzi A, Kupferberg SJ (2013) The importance of thermal conditions to recruitment success in stream-breeding frog populations distributed across a productivity gradient. Biological Conservation 168, 40-48.
| Crossref | Google Scholar |
Chen W, Olden JD (2018) Evaluating transferability of flow–ecology relationships across space, time and taxonomy. Freshwater Biology 63, 817-830.
| Crossref | Google Scholar |
Dare GC, Murray RG, Courcelles DMM, Malt JM, Palen WJ (2020) Run-of-river dams as a barrier to the movement of a stream-dwelling amphibian. Ecosphere 11, e03207.
| Crossref | Google Scholar |
Davies PM, Naiman RJ, Warfe DM, Pettit NE, Arthington AH, Bunn SE (2014) Flow–ecology relationships: closing the loop on effective environmental flows. Marine and Freshwater Research 65, 133-141.
| Crossref | Google Scholar |
Department of Agriculture, Water and the Environment (2018) Final report on the northern connectivity event (April–July 2018). (DAWE) Available at https://www.dcceew.gov.au/sites/default/files/documents/final-report-northern-connectivity-event-2018.pdf [Verified 18 August 2023]
Earl JE, Blomquist SM, Harper EB, Hocking DJ, Hunter ML, Jr, Johnson JR, Osbourn MS, Patrick DA, Popescu VD, Rittenhouse TAG, Rothermel BB (2022) Amphibian biomass export from geographically isolated wetlands: temporal variability, species composition, and potential implications for terrestrial ecosystems. Diversity 14, 163.
| Crossref | Google Scholar |
Eskew EA, Price SJ, Dorcas ME (2012) Effects of river-flow regulation on anuran occupancy and abundance in riparian zones. Conservation Biology 26, 504-512.
| Crossref | Google Scholar | PubMed |
Foerster A (2008) Managing and protecting environmental water: lessons from the Gwydir for ecologically sustainable water management in the Murray Darling Basin. Environmental and Planning Law Journal 25, 49-72.
| Google Scholar |
Gates KK, Vaughn CC, Julian JP (2015) Developing environmental flow recommendations for freshwater mussels using the biological traits of species guilds. Freshwater Biology 60, 620-635.
| Crossref | Google Scholar |
Guzy JC, Eskew EA, Halstead BJ, Price SJ (2018) Influence of damming on anuran species richness in riparian areas: a test of the serial discontinuity concept. Ecology and Evolution 8, 2268-2279.
| Crossref | Google Scholar | PubMed |
Hart BT (2016) The Australian Murray–Darling Basin plan: challenges in its implementation (part 1). International Journal of Water Resources Development 32, 819-834.
| Crossref | Google Scholar |
Hoffmann EP (2018) Environmental watering triggers rapid frog breeding in temporary wetlands within a regulated river system. Wetlands Ecology and Management 26, 1073-1087.
| Crossref | Google Scholar |
Holgerson MA, Duarte A, Hayes MP, Adams MJ, Tyson JA, Douville KA, Strecker AL (2019) Floodplains provide important amphibian habitat despite multiple ecological threats. Ecosphere 10, e02853.
| Crossref | Google Scholar |
Jenkins KM, Boulton AJ (2003) Connectivity in a Dryland River: short-term aquatic microinvertebrate recruitment following floodplain inundation. Ecology 84, 2708-2723.
| Crossref | Google Scholar |
King AJ, Gawne B, Beesley L, Koehn JD, Nielsen DL, Price A (2015) Improving ecological response monitoring of environmental flows. Environmental Management 55, 991-1005.
| Crossref | Google Scholar | PubMed |
Kingsford RT (2000) Ecological impacts of dams, water diversions and river management on floodplain wetlands in Australia. Austral Ecology 25, 109-127.
| Crossref | Google Scholar |
Kingsford RT, Norman FI (2002) Australian waterbirds – products of the continent’s ecology. Emu - Austral Ornithology 102, 47-69.
| Crossref | Google Scholar |
Kingsford RT, Mac Nally R, King A, Walker KF, Bino G, Thompson R, Wassens S, Humphries P (2015) A commentary on ‘Long-term ecological trends of flow-dependent ecosystems in a major regulated river basin’, by Matthew J. Colloff, Peter Caley, Neil Saintilan, Carmel A. Pollino and Neville D. Crossman. Marine and Freshwater Research 66, 970-980.
| Crossref | Google Scholar |
Kingsford RT, Porter JL, Brandis KJ, Ryall S (2020) Aerial surveys of waterbirds in Australia. Scientific Data 7, 172.
| Crossref | Google Scholar | PubMed |
Kupferberg SJ, Palen WJ, Lind AJ, Bobzien S, Catenazzi A, Drennan J, Power ME (2012) Effects of flow regimes altered by dams on survival, population declines, and range-wide losses of California river-breeding frogs. Conservation Biology 26, 513-524.
| Crossref | Google Scholar | PubMed |
Littlefair ME, Nimmo DG, Ocock JF, Michael DR, Wassens S (2021) Amphibian occurrence and abundance patterns across a modified floodplain ecosystem. Austral Ecology 46, 1343-1355.
| Crossref | Google Scholar |
Lytle DA, Merritt DM, Tonkin JD, Olden JD, Reynolds LV (2017) Linking river flow regimes to riparian plant guilds: a community-wide modeling approach. Ecological Applications 27, 1338-1350.
| Crossref | Google Scholar | PubMed |
Mathwin R, Wassens S, Gibbs MS, Young J, Ye Q, Saltré F, Bradshaw CJA (2023) Modeling the effects of water regulation on the population viability of a threatened amphibian. Ecosphere 14, e4379.
| Crossref | Google Scholar |
Mims MC, Olden JD (2013) Fish assemblages respond to altered flow regimes via ecological filtering of life history strategies. Freshwater Biology 58, 50-62.
| Crossref | Google Scholar |
Minasny B, McBratney AB (2006) A conditioned Latin hypercube method for sampling in the presence of ancillary information. Computers & Geosciences 32, 1378-1388.
| Crossref | Google Scholar |
Murray–Darling Basin Authority (2019) Basin-wide watering strategy. (MDBA) Available at https://www.mdba.gov.au/publications-and-data/publications/basin-wide-environmental-watering-strategy [Verified 10 September 2023]
Naniwadekar R, Vasudevan K (2014) Impact of dams on riparian frog communities in the Southern Western Ghats, India. Diversity 6, 567-578.
| Crossref | Google Scholar |
Nilsson C, Reidy CA, Dynesius M, Revenga C (2005) Fragmentation and flow regulation of the world’s large river systems. Science 308, 405-408.
| Crossref | Google Scholar | PubMed |
NSW Department of Planning, Industry and Environment – Environment, Energy and Science (2021) Use of water for the environment in NSW: outcomes 2019–20. (DPIE-EES, NSW Department of Planning and Environment) Available at https://www.environment.nsw.gov.au/topics/water/water-for-the-environment/planning-and-reporting/water-for-environment-outcomes-2019-20 [Verified 4 May 2023]
NSW Department of Planning, Industry and Environment – Environment, Energy and Science (2022) Use of water for the environment in NSW: outcomes 2020–21. (DPIE-EES, NSW Department of Planning and Environment) Available at https://www.environment.nsw.gov.au/topics/water/water-for-the-environment/planning-and-reporting/water-for-environment-outcomes-2020-21 [Verified 4 May 2023]
NSW Office of Environment and Heritage (2018) Use of water for the environment in New South Wales outcomes 2016–17. (NSW OEH) Available at https://www.environment.nsw.gov.au/-/media/OEH/Corporate-Site/Documents/Water/Water-for-the-environment/environmental-water-outcomes-report-2016-17-180191.pdf
NSW Office of Environment and Heritage (2019) Use of water for the environment in NSW: outcomes 2017–18. (NSW OEH) Available at https://www.environment.nsw.gov.au/topics/water/water-for-the-environment/planning-and-reporting/water-for-environment-outcomes-2017-18
NSW Office of Environment and Heritage (2020) Use of water for the environment in NSW: outcomes 2018–19. (NSW OEH) Available at https://www.environment.nsw.gov.au/topics/water/water-for-the-environment/planning-and-reporting/water-for-environment-outcomes-2018-19
Ocock JF, Kingsford RT, Penman TD, Rowley JJL (2014) Frogs during the flood: differential behaviours of two amphibian species in a dryland floodplain wetland. Austral Ecology 39, 929-940.
| Crossref | Google Scholar |
Ocock JF, Kingsford RT, Penman TD, Rowley JJ (2016) Amphibian abundance and detection trends during a large flood in a semi-arid floodplain wetland. Herpetological Conservation and Biology 11, 408-425.
| Google Scholar |
Ocock JF, Brandis KJ, Wolfenden BJ, Jenkins KM, Wassens S (2018) Gut content and stable isotope analysis of tadpoles in floodplain wetlands. Australian Journal of Zoology 66, 261-271.
| Crossref | Google Scholar |
Payne A (2014) Observations on the calling behaviour of the Jervis Bay tree frog Litoria jervisiensis. Australian Zoologist 37, 263-266.
| Crossref | Google Scholar |
Peek RA, O’Rourke SM, Miller MR (2021) Flow modification associated with reduced genetic health of a river-breeding frog, Rana boylii. Ecosphere 12, e03496.
| Crossref | Google Scholar |
Pilliod DS, Hossack BR, Bahls PF, Bull EL, Corn PS, Hokit G, Maxell BA, Munger JC, Wyrick A (2010) Non-native salmonids affect amphibian occupancy at multiple spatial scales. Diversity and Distributions 16, 959-974.
| Crossref | Google Scholar |
Pough FH (1980) The advantages of ectothermy for tetrapods. The American Naturalist 115, 92-112.
| Crossref | Google Scholar |
Quentin Grafton R, Chu L, Kingsford RT, Bino G, Williams J (2022) Resilience to hydrological droughts in the northern Murray–Darling Basin, Australia. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 380, 20210296.
| Crossref | Google Scholar |
Railsback SF, Harvey BC, Kupferberg SJ, Lang MM, McBain S, Welsh HH, Jr (2016) Modeling potential river management conflicts between frogs and salmonids. Canadian Journal of Fisheries and Aquatic Sciences 73, 773-784.
| Crossref | Google Scholar |
Royle JA (2004) Modeling abundance index data from anuran calling surveys. Conservation Biology 18, 1378-1385.
| Crossref | Google Scholar |
Salinas-Rodríguez SA, Barba-Macías E, Infante Mata D, Nava-López MZ, Neri-Flores I, Domínguez Varela R, González Mora ID (2021) What do environmental flows mean for long-term freshwater ecosystems’ protection? Assessment of the Mexican water reserves for the environment program. Sustainability 13, 1240.
| Crossref | Google Scholar |
Sarker MAR, McKnight DT, Ryder D, Walcott A, Ocock JF, Spencer JA, Preston D, Brodie S, Bower DS (2022) The effect of inundation on frog communities and chorusing behaviour. Ecological Indicators 145, 109640.
| Crossref | Google Scholar |
Stocks JR, Davis S, Anderson MJ, Asmus MW, Cheshire KJM, van der Meulen DE, Walsh CT, Gilligan DM (2021) Fish and flows: abiotic drivers influence the recruitment response of a freshwater fish community throughout a regulated lotic system of the Murray-Darling Basin, Australia. Aquatic Conservation: Marine and Freshwater Ecosystems 31, 3228-3247.
| Crossref | Google Scholar |
Swirepik JL, Burns IC, Dyer FJ, Neave IA, O’Brien MG, Pryde GM, Thompson RM (2016) Establishing environmental water requirements for the Murray–Darling Basin, Australia’s largest developed river system. River Research and Applications 32, 1153-1165.
| Crossref | Google Scholar |
Thomas RF, Kingsford RT, Lu Y, Cox SJ, Sims NC, Hunter SJ (2015) Mapping inundation in the heterogeneous floodplain wetlands of the Macquarie Marshes, using Landsat Thematic Mapper. Journal of Hydrology 524, 194-213.
| Crossref | Google Scholar |
Thompson RM, King AJ, Kingsford RM, Mac Nally R, Poff NL (2018) Legacies, lags and long-term trends: effective flow restoration in a changed and changing world. Freshwater Biology 63, 986-995.
| Crossref | Google Scholar |
Tockner K, Pusch M, Borchardt D, Lorang MS (2010) Multiple stressors in coupled river–floodplain ecosystems. Freshwater Biology 55, 135-151.
| Crossref | Google Scholar |
Vörösmarty CJ, McIntyre PB, Gessner MO, Dudgeon D, Prusevich A, Green P, Glidden S, Bunn SE, Sullivan CA, Liermann CR, Davies PM (2010) Global threats to human water security and river biodiversity. Nature 467, 555-561.
| Crossref | Google Scholar | PubMed |
Watts RJ, Kopf RK, McCasker N, Howitt JA, Conallin J, Wooden I, Baumgartner L (2018) Adaptive management of environmental flows: using irrigation infrastructure to deliver environmental benefits during a large hypoxic blackwater event in the Southern Murray–Darling Basin, Australia. Environmental Management 61, 469-480.
| Crossref | Google Scholar | PubMed |
Wimalathunge NS, Bishop TFA (2019) A space–time observation system for soil moisture in agricultural landscapes. Geoderma 344, 1-13.
| Crossref | Google Scholar |
Wineland SM, Bașağaoğlu H, Fleming J, Friedman J, Garza-Diaz L, Kellogg W, Koch J, Lane BA, Mirchi A, Nava LF (2022) The environmental flows implementation challenge: insights and recommendations across water-limited systems. Wiley Interdisciplinary Reviews: Water 9, e1565.
| Crossref | Google Scholar |
Wright MN, Dankowski T, Ziegler A (2017) Unbiased split variable selection for random survival forests using maximally selected rank statistics. Statistics in Medicine 36, 1272-1284.
| Crossref | Google Scholar | PubMed |
Yarnell S, Peek R, Epke G, Lind A (2016) Management of the spring snowmelt recession in regulated systems. JAWRA Journal of the American Water Resources Association 52, 723-736.
| Crossref | Google Scholar |
