1. The round goby (Neogobius melanostomus) is among the fastest‐spreading introduced aquatic species in North America and is radiating inland from the Great Lakes into freshwater ecosystems across the landscape. Predicting and managing the impacts of round gobies requires information on the factors influencing their distribution in habitats along the invasion front, yet this information is not available for many recently invaded ecosystems. We evaluated the seasonal habitat use and biomass of round gobies in an inland temperate lake to define the spatiotemporal scope of biological interactions at the leading edge of the round goby invasion.
2. Using novel statistical approaches, we combined hierarchical models that control for imperfect species detection with flexible smooth terms to describe non‐linear relationships between round goby abundance and environmental gradients. Subsequently, we generated accurate detection‐corrected estimates of the standing stock biomass of round gobies.
3. Our results show seasonally differentiated habitat niches, where suitable round goby habitat in summer months is restricted to shallow depths (<18.4 m) with a mixture of vegetative and mussel cover. We found high round goby biomass of 122 kg/ha in occupied habitats during the summer, with a total lake‐wide biomass of 766,000 kg. In winter, round gobies migrate to deep offshore habitats and disperse, dramatically altering their scope for biological interactions with resident aquatic species across summer and winter seasons.
4. The results of this study indicate that the scope of biological interactions in inland lakes may be seasonally variable, with potential for high round goby biomass in shallow lakes or at the periphery of deep lakes in the summer months. Such shallow‐water habitats may therefore present higher risk of ecological impacts from round gobies in invaded lentic ecosystems. As round gobies expand inland, consideration of seasonal habitat use will be an important factor in predicting the impacts of this pervasive invader.

中文翻译：

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季节性栖息地的使用表明，深度可能会调解内陆湖泊对虾虎鱼的侵袭性

1. 圆环虾虎鱼（Neogobius melanostomus）是北美传播最快的引进水生物种之一，并从大湖内陆辐射到整个景观的淡水生态系统。要预测和管理轮虫的影响，需要有关影响其在入侵前沿栖息地中分布的因素的信息，但是对于许多近期入侵的生态系统而言，此信息不可用。我们评估了内陆温带湖泊中轮状虾虎鱼的季节性栖息地利用和生物量，以定义轮状虾虎鱼入侵前沿的生物相互作用的时空范围。
2. 使用新颖的统计方法，我们将控制不完美物种检测的层次模型与灵活的平滑术语相结合，以描述round游鱼丰度与环境梯度之间的非线性关系。随后，我们对轮状虾虎鱼的常规种群生物量进行了精确的检测校正估计。
3. 我们的研究结果显示出季节性不同的栖息地生态位，在夏季，合适的圆形虾虎鱼栖息地被限制在浅深度（<18.4 m），其中植被和贻贝被混合。我们在夏季的栖息地中发现了高达122千克/公顷的虾虎鱼生物量，整个湖区的生物量总量为766,000千克。在冬季，轮状虾虎鱼迁移到深海近海栖息地并散布，从而极大地改变了它们在整个夏季和冬季与生长期水生生物相互作用的范围。
4. 这项研究的结果表明，内陆湖泊的生物相互作用的范围可能是季节性变化的，在夏季，浅湖或深湖外围的虾虎鱼生物量较高。因此，这样的浅水生境可能会对入侵的透镜状生态系统中的轮状虾虎鱼造成较高的生态影响。随着轮状虎虾向内陆扩张，对季节性栖息地使用的考虑将成为预测这一普遍入侵者影响的重要因素。