To better understand the ecology of coldwater fishes in urban‐dominated landscapes, factors influencing seasonal brook trout (Salvelinus fontinalis) habitat use were assessed using backpack electrofishing surveys in three urban groundwater‐fed streams in central Ontario. Generalised additive models revealed that yearling brook trout (<100 mm TL) were primarily influenced by water quality (stream temperature, conductivity), while older brook trout (≥100 mm TL) were primarily influenced by stream morphology (water depth, undercut bank volume). Colder stream temperatures were preferred by yearlings in summer, whereas they occupied the warmest temperatures available in winter and spring. Yearlings were never found in sites with high stream conductivity (≥ 900 µs/cm), regardless of season, which may be attributed to poor water quality in stream sections with stormwater influence. Older brook trout were found mainly at intermediate pool depths in spring and summer, while there was a greater range of depths used during the spawning season. Undercut banks were important for older brook trout occupancy at all times of year. The protection of groundwater aquifers in urban watersheds is recommended to maintain optimal temperature regimes for the persistence and successful recruitment of native brook trout.

中文翻译：

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影响城市上游水域本地溪鳟（Salvelinus fontinalis）的季节性栖息地利用的因素

为了更好地了解城市主导景观中冷水鱼类的生态，影响季节性河鳟的因素（Salvelinus fontinalis）在安大略省中部的三个城市地下水灌溉溪流中使用背包电钓鱼法评估了栖息地的利用。广义加性模型表明，一岁河鳟（<100 mm TL）主要受水质（水流温度，电导率）的影响，而较老的河鳟（≥100mm TL）主要受水流形态（水深，底切河岸量）的影响）。夏季，一岁鸡更喜欢较低的溪流温度，而冬季和春季则是最暖的温度。不论季节如何，都不会在高河水电导率（≥900 µs / cm）的地点发现一岁，这可能归因于受雨水影响的河水段的水质差。在春季和夏季，主要在较中间的池深处发现了较老的溪鳟，在产卵季节使用的深度范围更大。底切银行对于一年中的所有时间都比小鳟鱼更重要。建议对城市流域的地下水含水层进行保护，以保持最佳的温度状态，以持久地和成功地招募本地河鳟。