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<p>Human activities are changing ecosystems around the world, and in marine systems urbanised estuaries are amongst the most heavily impacted. These systems are typically complex, yet our ability to effectively manage impacts is often limited by a lack of baseline data. This study investigates fish assemblages in the highly urbanised estuary, Gamay (Botany Bay), on the SE Australian coast, which has not been comprehensively surveyed since 1981. We used data from museum collections, citizen science and scientific research to compile a list of all known species. We investigated changes in fishes and their functional traits, as well as exploring the role of the different data sources in contributing to our understanding. In total, 418 fish species have been observed in Gamay, which represents a ~ 45% increase over previous estimates (189 species). We note this likely underestimates the true diversity of fishes as, compared to neighbouring Sydney Harbour, observation numbers were low across most datasets. The increase in Gamay’s fish species can largely be attributed to the rise of citizen science since the 2000s, as well as an increase in warm water and tropical affiliated species observations in recent years. Interestingly, 193 species (~ 46%) were unique to a single dataset, emphasising the innate intricacies of each dataset. With anthropogenic pressures in urban estuaries likely to keep increasing our study highlights the value of hybrid approaches, that combine citizen science and natural history collections with traditional scientific datasets, to comprehensively survey a region and track how communities are changing.</p>

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The fishes of Gamay (Botany Bay): combining multiple data sources to characterise assemblage structure in an Australian urbanised estuary

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Talia P. Stelling-Wood,
  • Amanda Hay,
  • Joseph D. DiBattista,
  • John Turnbull,
  • Faith Ochwada-Doyle,
  • Martina A. Doblin,
  • Will Glamore,
  • Paul Gribben,
  • Sally Reader,
  • Rezvan Hatami,
  • Will Figueira

摘要

Human activities are changing ecosystems around the world, and in marine systems urbanised estuaries are amongst the most heavily impacted. These systems are typically complex, yet our ability to effectively manage impacts is often limited by a lack of baseline data. This study investigates fish assemblages in the highly urbanised estuary, Gamay (Botany Bay), on the SE Australian coast, which has not been comprehensively surveyed since 1981. We used data from museum collections, citizen science and scientific research to compile a list of all known species. We investigated changes in fishes and their functional traits, as well as exploring the role of the different data sources in contributing to our understanding. In total, 418 fish species have been observed in Gamay, which represents a ~ 45% increase over previous estimates (189 species). We note this likely underestimates the true diversity of fishes as, compared to neighbouring Sydney Harbour, observation numbers were low across most datasets. The increase in Gamay’s fish species can largely be attributed to the rise of citizen science since the 2000s, as well as an increase in warm water and tropical affiliated species observations in recent years. Interestingly, 193 species (~ 46%) were unique to a single dataset, emphasising the innate intricacies of each dataset. With anthropogenic pressures in urban estuaries likely to keep increasing our study highlights the value of hybrid approaches, that combine citizen science and natural history collections with traditional scientific datasets, to comprehensively survey a region and track how communities are changing.