Biophysical status of remnant freshwater floodplain lagoons in the Great Barrier Reef catchment: a challenge for assessment and monitoring

We investigated the biophysical environment, invertebrate fauna and ecosystem health of lagoons on the Tully–Murray floodplain in the Queensland Wet Tropics bioregion. These wetlands are biologically rich but have declined in area and condition with agricultural development and are poorly protected, despite being located between two World Heritage areas. Lagoons varied in size, habitats and water quality, with increasing signatures of agriculture (e.g. elevated nutrient concentrations) from the upper to lower floodplain. Zooplankton were abundant, but not diverse, and correlated variously with environmental variables, so were not useful in assessing lagoon condition. Benthic macroinvertebrates were abundant and diverse and correlated strongly with riparian condition, habitats, water quality and degree of agriculture in the catchment, but gradients in assemblage structure were not strong because the flow regime, with multiple annual floods, maintains higher water quality than in some tropical systems. The absence of pristine reference lagoons and the limited availability of replicate sites hamper the development of monitoring systems. Nevertheless, we show that appropriate sampling, analysis and knowledge of comparable systems allow inferences to be drawn regarding ecological condition. This is important because environmental managers need best available and timely advice whatever the opportunities for rigorous study design.

[1]  A. Arthington,et al.  Modelling wetland connectivity during overbank flooding in a tropical floodplain in north Queensland, Australia , 2012 .

[2]  Aaron M.Ellison PC‐ORD: Multivariate Analysis of Ecological Data , 1998, The Bulletin of the Ecological Society of America.

[3]  R. Pearson,et al.  Macroinvertebrate assemblages in rivers of the Australian dry tropics are highly variable , 2012, Freshwater Science.

[4]  A. Mackay,et al.  Seasonal and spatial hydrological variability drives aquatic biodiversity in a flood-pulsed, sub-tropical wetland , 2012 .

[5]  J. Wallace,et al.  The filtering capacity of a tropical riverine wetland: II. Sediment and nutrient balances , 2012 .

[6]  J. Wallace,et al.  The filtering capacity of a tropical riverine wetland: I. Water balance , 2012 .

[7]  John R. Leathwick,et al.  Quantifying relationships between land-use gradients and structural and functional indicators of stream ecological integrity , 2012 .

[8]  Evan Harrison,et al.  Analyzing cause and effect in environmental assessments: using weighted evidence from the literature , 2011, Freshwater Science.

[9]  S. Januchowski‐Hartley,et al.  Fresh Waters and Fish Diversity: Distribution, Protection and Disturbance in Tropical Australia , 2011, PloS one.

[10]  A. Arthington,et al.  Extreme flow variability and the ‘boom and bust’ ecology of fish in arid‐zone floodplain rivers: a case history with implications for environmental flows, conservation and management , 2011 .

[11]  G. Gourène,et al.  Macroinvertebrate communities associated with macrophyte habitats in a tropical man-made lake (Lake Taabo, Côte d’Ivoire) , 2011 .

[12]  S. Im,et al.  Composition of aquatic invertebrates associated with macrophytes in Lake Tonle Sap, Cambodia , 2011, Limnology.

[13]  J. Olden,et al.  Multi-scale environmental factors explain fish losses and refuge quality in drying waterholes of Cooper Creek, an Australian arid-zone river , 2010 .

[14]  A. Arthington,et al.  Macrophytes as indicators of stream condition in the wet tropics region, Northern Queensland, Australia , 2010 .

[15]  J. Wallace,et al.  Flood water quality and marine sediment and nutrient loads from the Tully and Murray catchments in north Queensland, Australia , 2009 .

[16]  Jon Brodie,et al.  Identifying the land-based sources of suspended sediments, nutrients and pesticides discharged to the Great Barrier Reef from the Tully–Murray Basin, Queensland, Australia , 2009 .

[17]  J. Brodie,et al.  Relationships between land use and nutrient concentrations in streams draining a ‘wet-tropics’ catchment in northern Australia , 2009 .

[18]  F. Kroon,et al.  Catchment management and health of coastal ecosystems: synthesis and future research , 2009 .

[19]  L. Hateley,et al.  Catchment modelling of sediment, nitrogen and phosphorus nutrient loads with SedNet/ANNEX in the Tully–Murray basin , 2009 .

[20]  P. Horwitz,et al.  Wetland invertebrate richness and endemism on the Swan Coastal Plain,Western Australia , 2009 .

[21]  F. Comín,et al.  Modelling the response of floodplain aquatic assemblages across the lateral hydrological connectivity gradient , 2009 .

[22]  M. E. Galassi,et al.  Invertebrate assemblages associated with leaf litter in three floodplain wetlands of the Paraná River , 2009, Wetlands.

[23]  J. Brodie,et al.  Herbicides: a new threat to the Great Barrier Reef. , 2009, Environmental pollution.

[24]  J. Brodie,et al.  Water quality research: baseline synthesis and year 1 summary , 2009 .

[25]  C. Scott Findlay,et al.  The effects of adjacent land use on wetland species richness and community composition , 2006, Wetlands.

[26]  C. Richardson Ecological functions and human values in wetlands: A framework for assessing forestry impacts , 1994, Wetlands.

[27]  J. Olden,et al.  Flow variability and the biophysical vitality of river systems , 2008 .

[28]  J. Brodie,et al.  Pesticide residues in waterways of the lower Burdekin region: challenges in ecotoxicological interpretation of monitoring data , 2008 .

[29]  R. Pearson,et al.  Seasonal flooding, instream habitat structure and fish assemblages in the Mulgrave River, north-east Queensland: towards a new conceptual framework for understanding fish-habitat dynamics in small tropical rivers , 2008 .

[30]  Raymond N. Gorley,et al.  PERMANOVA+ for PRIMER. Guide to software and statistical methods , 2008 .

[31]  A. Arthington,et al.  Origins and Maintenance of Freshwater Fish Biodiversity in the Wet Tropics Region , 2008 .

[32]  J. Wallace,et al.  The role of coastal floodplains in generating sediment and nutrient fluxes to the Great Barrier Reef lagoon in Australia , 2008 .

[33]  Klement Tockner,et al.  Aquatic Ecosystems: Flood plains: critically threatened ecosystems , 2008 .

[34]  L. Maltchik,et al.  Influence of area, altitude and hydroperiod on macroinvertebrate communities in southern Brazil wetlands , 2007 .

[35]  L. R. Evangelista,et al.  Influence of aquatic macrophyte habitat complexity on invertebrate abundance and richness in tropical lagoons , 2007 .

[36]  R. Pearson,et al.  Acute and Postexposure Effects of Ammonia Toxicity on Juvenile Barramundi (Lates calcarifer [Bloch]) , 2007, Archives of environmental contamination and toxicology.

[37]  R. Pearson,et al.  The effect of fine sedimentation on tropical stream macroinvertebrate assemblages: a comparison using flow-through artificial stream channels and recirculating mesocosms , 2007, Hydrobiologia.

[38]  J. Brodie,et al.  WATER QUALITY CHARACTERISTICS OF WATER DRAINING DIFFERENT LAND USES IN THE TULLY/MURRAY RIVERS REGION , 2007 .

[39]  S. S. S. Sarma,et al.  Review of Recent Ecotoxicological Studies on Cladocerans , 2006, Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes.

[40]  M. Finlayson,et al.  The comparative biodiversity of seven globally important wetlands: a synthesis , 2006, Aquatic Sciences.

[41]  J. Lowry,et al.  A conceptual basis for the wise use of wetlands in northern Australia – linking information needs, integrated analyses, drivers of change and human well-being , 2005 .

[42]  R. Pearson,et al.  Food webs in tropical Australian streams: shredders are not scarce , 2005 .

[43]  D. Burrows,et al.  Improved dissolved oxygen status following removal of exotic weed mats in important fish habitat lagoons of the tropical Burdekin River floodplain, Australia. , 2005, Marine pollution bulletin.

[44]  R. Pearson,et al.  Effect of low dissolved oxygen on survival, emergence, and drift of tropical stream macroinvertebrates , 2004, Journal of the North American Benthological Society.

[45]  Richard H. Norris,et al.  Monitoring river health , 2000, Hydrobiologia.

[46]  J. A. Davis,et al.  Seasonal variation in the macroinvertebrate fauna of wetlands of differing water regime and nutrient status on the Swan Coastal Plain, Western Australia , 1995, Hydrobiologia.

[47]  J. S. Bradley,et al.  The influence of sampling method on the classification of wetland macroinvertebrate communities , 1993, Hydrobiologia.

[48]  R. E. Smith,et al.  The macro-invertebrate communities of temporary pools in an intermittent stream in tropical Queensland , 1987, Hydrobiologia.

[49]  P. Outridge Possible causes of high species diversity in tropical Australian freshwater macrobenthic communities , 1987, Hydrobiologia.

[50]  C. Findlay,et al.  The effects of adjacent land use on wetland amphibian species richness and community composition , 2003 .

[51]  M. Douglas,et al.  Effects of the exotic macrophyte, para grass (Urochloa mutica), on benthic and epiphytic macroinvertebrates of a tropical floodplain , 2003 .

[52]  Miles Furnas,et al.  Catchments and Corals: Terrestrial Runoff to the Great Barrier Reef , 2003 .

[53]  Angela H. Arthington,et al.  The assessment of riparian vegetation as an indicator of stream condition, with particular emphasis on the rapid assessment of flow-related impacts , 2002 .

[54]  K. Winemiller,et al.  Fish Assemblage Structure in Relation to Environmental Variation among Brazos River Oxbow Lakes , 2000 .

[55]  R. Pearson,et al.  Nutrient enhancement, food quality and community dynamics in a tropical rainforest stream , 2000 .

[56]  A. K. Johnson,et al.  Distribution of coastal freshwater wetlands and riparian forests in the Herbert River catchment and implications for management of catchments adjacent the Great Barrier Reef Marine Park , 1999, Environmental Conservation.

[57]  C. Heckman The Seasonal Succession of Biotic Communities in Wetlands of the Tropical Wet‐and‐Dry Climatic Zone: V. Aquatic Invertebrate Communities in the Pantanal of Mato Grosso, Brazil , 1998 .

[58]  M. Kennard,et al.  Species Richness and Geographical Variation in Assemblage Structure of the Freshwater Fish Fauna of the Wet Tropics Region of Northern Queensland , 1996 .

[59]  R. Pearson,et al.  Responses of Rock Fauna to Physical Disturbance in Two Australian Tropical Rainforest Streams , 1995, Journal of the North American Benthological Society.

[60]  P. S. Lake,et al.  Species richness in streams: Patterns over time, with stream size and with latitude , 1994 .

[61]  R. Pearson,et al.  Toxicity of diquat pulse exposure to tropical freshwater shrimp (Caridina nilotica, atyidae) , 1993, Bulletin of environmental contamination and toxicology.

[62]  J. A. Davis,et al.  Multivariate pattern analysis of wetland invertebrate communities and environmental variables in Western Australia , 1992 .

[63]  A. Boulton,et al.  Macroinvertebrate assemblages in floodplain habitats of the lower river murray, South Australia , 1991 .

[64]  W. Junk The flood pulse concept in river-floodplain systems , 1989 .

[65]  L. Penridge,et al.  The effects of pollution by organic sugar mill effluent on the macro-invertebrates of a stream in tropical Queensland, Australia , 1987 .