Ariidae) Feeding on Freshwater Floodplains of Northern Australia

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Ariidae) Feeding on Freshwater Floodplains of Northern Australia CSIRO PUBLISHING Marine and Freshwater Research, 2020, 71, 1628–1639 https://doi.org/10.1071/MF20012 Sea catfishes (Ariidae) feeding on freshwater floodplains of northern Australia Bradley J. Pusey A,B,C,E, Timothy D. JardineD, Stuart E. BunnA and Michael M. DouglasC AAustralian Rivers Institute, Griffith University, Kessels Road, Nathan, Qld 4111, Australia. BCharles Darwin University, Ellengowan Drive, Casuarina, NT 0810, Australia. CSchool of Biological Sciences, The University of Western Australia, Stirling Highway, Crawley, WA 6009, Australia. DSchool of Environment and Sustainability, Global Institute for Water Security, University of Saskatchewan, Preston Road, Saskatoon, SK, S7H 4J6, Canada. ECorresponding author. Email: [email protected] Abstract. Flooding of the terminal floodplains of northern Australian rivers provides a greatly expanded, productive habitat accessed by both freshwater and estuarine fishes. This study aimed to determine the extent to which sea catfishes (Ariidae) make use of floodplains and the reasons for doing so (i.e. spawning, feeding). Nine species were collected from floodplains and adjacent distributaries of the Mitchell and Flinders rivers; floodplain use was largely restricted to freshwater species. Evidence of prior wet season spawning was recorded for some species, and mesenteric lipid deposits indicated that fish were in good condition. However, little evidence of spawning on floodplains was found. Stomach content analysis and stable isotope analysis indicated dietary partitioning, particularly between freshwater and estuarine species, but also within freshwater species, and indicated that some species were responsive to variations in food availability. Isotope analyses suggest extensive movement between freshwater, estuarine and marine habitats at different life history stages for the catfish assemblage studied. Terminal floodplains of northern Australian rivers provide important temporary habitat for adult sea catfishes to feed upon, but do not appear to be used as spawning grounds. Additional keywords: dietary partitioning, stable isotopes, stomach contents, wet–dry tropics. Received 9 January 2020, accepted 8 April 2020, published online 11 June 2020 Introduction across much of northern Australia is often short and does not Floodplains are among the most biologically productive and necessarily occur every year (Jardine et al. 2012a, 2012b); these diverse ecosystems on Earth and are of enormous economic characteristics may therefore constrain the extent to which fish importance (Tockner and Stanford 2002). Periodic rhythmic do indeed make use of floodplain habitats, particularly as flooding links aquatic and terrestrial ecosystems and enhances spawning areas. productivity during both the flooded and dry phases (Pettit et al. Ariidae (sea catfishes), a cosmopolitan family of ,30 genera 2011; Jardine et al. 2015). This period of increased aquatic and more than 150 species (Nelson et al. 2016), is among the production, driven largely by algal production, and the provision most abundant of fishes in tropical estuarine habitats (Barletta of an expanded and structurally complex habitat ensure that et al. 2005), often dominating commercial and artisanal fishery floodplains are used by riverine fishes for adult growth and catches (Coates 1991; Dantas et al. 2010). Although mainly reproduction, and as nursery grounds for juvenile fish (Bayley marine and estuarine in habit, many species occur in fresh waters 1995; Winemiller 2004; Jardine et al. 2012a, 2012b; Villamarı´n (Betancur-R 2010) and make use of floodplains (Pusey et al. et al. 2016). When river floodplains are located close to the river 2017). Ariid catfishes are, in general, flexible opportunistic terminus, there is increased potential for inundation to expand feeders (Ya´n˜ez-Arancibia and Lara-Domı´nguez 1988; Bachok the links between terrestrial, riverine and marine ecosystems. et al. 2004; Pusey et al. 2004; Krumme et al. 2008). Ontogenetic For example, when inundated, the vast terminal floodplains of (Ya´n˜ez-Arancibia and Lara-Domı´nguez 1988; Hajisamae et al. northern Australia are contiguous with, and grade into, the 2004; Mendoza-Carranza and Vieira 2009), spatial (Mendoza- receiving marine environment (Ward et al. 2011), creating the Carranza and Vieira 2009) and phenotypic (Krumme et al. 2008) opportunity for marine, estuarine and freshwater fish to access variation in prey choice within species contribute collectively to elevated primary and secondary floodplain production (Pettit a perception of flexible feeding within the family. Such flexi- et al. 2011; Adame et al. 2017). However, floodplain inundation bility may allow ariid catfishes to make use of a variety of food Journal compilation Ó CSIRO 2020 Open Access CC BY-NC-ND www.publish.csiro.au/journals/mfr Sea catfish on freshwater floodplains Marine and Freshwater Research 1629 Mitchell River 0 50 100 200 km 0 5 10 km River or stream Lake or swamp Land subject to inundation Saline coastal flat or swamp Flinders–Norman River 0 5 10 km Fig. 1. Terminal floodplains of the Mitchell and Flinders rivers, northern Australia. Sample locations are indicated by red circles. types when and where they become available (such as occurs overcome) and infrequently undertaken. Consequently, our during flood inundation) and, as a consequence, lead to high understanding of ecological dynamics during this phase of the overlap in resource use. Conversely, this flexibility may allow hydrological cycle remains an important knowledge gap (Davis closely related species to effectively partition resources; dietary et al. 2018), highlighting the value of information gathered partitioning within sympatric ariid assemblages has been incidentally during the conduct of any research activities. We reported (Blaber et al. 1994; Maitra et al. 2020). However, opportunistically gathered information on the diet and condition Blaber et al. (1994) demonstrated that interspecific variation in of catfishes collected from the lower-most reaches of main river prey consumption was largely explained by interspecific differ- channels and the adjacent inundated floodplain habitats during ences in head and mouth morphology (dentition, mouth size and short fieldwork campaigns in the Mitchell and Flinders rivers, shape). Thus, in this case, partitioning may be phylogenetically northern Australia, described elsewhere (e.g. Jardine et al. based rather than driven by the dynamics of predator and prey 2012a, 2012b). The aims of the study were to determine: abundance. Similarly, partitioning within an ariid catfish assem- (1) the diversity, diet and condition of sea catfishes present blage (four species) of the Cochin Estuary was limited to one within flooded lower river and adjacent floodplain habitats; and species only, and this species, for which molluscs were an (2) the manner and extent to which catfishes make use of important prey item, used the estuary on a seasonal basis only floodplain production. We hypothesised that: (1) both freshwa- (Maitra et al. 2020). ter and estuarine catfishes would access floodplain habitats; Ariid catfishes are known to disperse widely and make use of (2) both freshwater and estuarine catfish would spawn in floodplain habitats (Bishop et al. 2001; Crook et al. 2020), and floodplain habitats; and (3) the generalist nature of catfish to transport accumulated nutrients and energy elsewhere feeding would result in little interspecific differences in diet. throughout the riverine landscape (Jardine et al. 2012a). The present study was undertaken as part of a larger program that Materials and methods examined food web variation in rivers of tropical northern Australia (Warfe et al. 2011; Jardine et al. 2012a, 2012b, Study area 2015). Importantly, components of this research were conducted The Mitchell and Flinders rivers of northern Australia are large during the wet season when rivers were in short, but intense, systems (72 000 and 109 000 km2 respectively) emptying into periods of flood. Ecological studies during this phase of the the Gulf of Carpentaria (Fig. 1) that experience strong wet–dry hydrological cycle are logistically difficult due to the remote- seasonality in discharge (Kennard et al. 2010; Warfe et al. ness of the area (accessibility is limited and expensive to 2011). The catchments of both rivers are largely covered by 1630 Marine and Freshwater Research B. J. Pusey et al. 7000 M1 F M2 6000 ) –1 5000 4000 3000 2000 Discharge (ML day 1000 0 1-Sep-08 1-Dec-08 1-Mar-09 1-Jun-09 1-Sep-09 1-Dec-09 1-Mar-101-Jun-10 1-Sep-10 1-Dec-10 Date Fig. 2. Daily discharge for the Mitchell River (solid line) and Flinders River (dashed line) over the period of the study. Data shown are for the most downstream gauges in each system (Koolatah Gauge 919009A and Walkers Bend Gauge 915003A in the Mitchell and Flinders rivers respectively). Sampling occasions are indicated by the arrows: M1, Mitchell River 2009; M2, Mitchell River 2010; F, Flinders River 2010. monsoonal dry sclerophyllous vegetation, and land use is primarily intended to collect a diverse array of material for SIA dominated by free-range grazing. Both rivers are distinguished and that a sample design focused solely on catfish and intended by large terminal floodplains that are inundated for less than to quantify abundance across different habitats was precluded 2 months a year by a combination of direct rainfall capture and by time constraints. Note also that the Mitchell River was local flooding during the wet season (Ward
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