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<p>While seabirds spend most of their lives in marine environments, their ecological roles extend from ocean ecosystems to terrestrial breeding sites. Here, we used subfossil cladoceran assemblages in dated sediment cores (spanning ~ 5800&#xa0;years) to track the inland aquatic impacts corresponding to changing inputs from the world’s third-largest known Leach’s Storm-Petrel (<i>Hydrobates leucorhous</i>) colony on Grand Colombier Island (St. Pierre and Miquelon, France), which was disrupted by European settlement in the early 1800s. Using a comparative paleolimnological approach with data from the world’s largest storm-petrel colony, our sediment records tracked long-term seabird colony trends, revealing that increased avian biovector activity supported rises in small pelagic cladocerans (mainly <i>Bosmina</i> spp.), likely resulting from increased nutrient loading and associated pond habitat changes. After the seabird colony declined in the early 1800s, pelagic cladocerans decreased, while littoral taxa increased, likely from changing nutrient dynamics that promoted macrophyte growth, causing a shift toward greater abundance of littoral taxa. Changes in cladoceran assemblages were correlated with shifts in seabird-related proxies, such as diatom communities, δ<sup>15</sup>N, and δ<sup>13</sup>C isotope measurements. Overall, we conclude that seabird inputs alter habitat structure, nutrient regimes, food availability, pH, and aquatic calcium levels, collectively driving substantial shifts in the aquatic ecosystem.</p>

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Cladoceran assemblage changes reveal long-term ecosystem responses to anthropogenically driven seabird declines

  • 期刊论文

  • 发表日期：

    2026年3月5日

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  • Zoe A. Kane,
  • Matthew P. Duda,
  • John P. Smol

摘要

While seabirds spend most of their lives in marine environments, their ecological roles extend from ocean ecosystems to terrestrial breeding sites. Here, we used subfossil cladoceran assemblages in dated sediment cores (spanning ~ 5800 years) to track the inland aquatic impacts corresponding to changing inputs from the world’s third-largest known Leach’s Storm-Petrel (Hydrobates leucorhous) colony on Grand Colombier Island (St. Pierre and Miquelon, France), which was disrupted by European settlement in the early 1800s. Using a comparative paleolimnological approach with data from the world’s largest storm-petrel colony, our sediment records tracked long-term seabird colony trends, revealing that increased avian biovector activity supported rises in small pelagic cladocerans (mainly Bosmina spp.), likely resulting from increased nutrient loading and associated pond habitat changes. After the seabird colony declined in the early 1800s, pelagic cladocerans decreased, while littoral taxa increased, likely from changing nutrient dynamics that promoted macrophyte growth, causing a shift toward greater abundance of littoral taxa. Changes in cladoceran assemblages were correlated with shifts in seabird-related proxies, such as diatom communities, δ15N, and δ13C isotope measurements. Overall, we conclude that seabird inputs alter habitat structure, nutrient regimes, food availability, pH, and aquatic calcium levels, collectively driving substantial shifts in the aquatic ecosystem.