Poster Presentation 2024 Australian Marine Sciences Association Annual Meeting combined with NZMSS

Tides of Change: an Investigation into Temporal Influences on Intertidal Fish. (#695)

Christopher Lowe 1 2 , Nicole Flint 1 3 , Emma L Jackson 1 2 , Guy Carton 1 3
  1. Coastal Marine Ecosystems Research Centre, Central Queensland University, Gladstone, Queensland, Australia
  2. School of Health, Medical and Applied Sciences, Central Queensland University, Gladstone, Queensland, Australia
  3. School of Health, Medical and Applied Sciences, Central Queensland University, Rockhampton, Queensland, Australia

Variations in tidal amplitudes are driven by lunar cycles resulting in varying durations of inundation of intertidal habitats during different moon phases. Given this interaction, it is likely that lunar cycles influence the movements and behaviours of fish species that utilise intertidal habitats. Since lunar cycles are not the only temporal factors that can act as driving forces on fish, we aimed to investigate how short-term (lunar) and long-term (seasonal) variations influence fish utilising a restored intertidal estuarine habitat. Fish surveys were undertaken using seine nets, while baited remote underwater video systems and novel electronic predation sensors (EPS), were used to investigate rates of scavenging and predation. The EPS were designed for intertidal habitats and included electronic components to detect tide height and the presence or absence of a bait. These two measures allowed for a specific predation time to be calculated, based on the period the bait was submerged and available for predation. The results of our multi-method analysis at a range of temporal scales, allows for greater understanding of variations in intertidal habitat usage by fish communities. This may aid in the interpretation of previous and future research on foraging patterns in similar environments.