February might feel quiet outside, but in the weeks and months ahead many native species will be preparing for one of the most important parts of their life cycles: reproduction. Courtship, spawning, and breeding behaviors can be closely tied to water temperature, flow, habitat structure, and water quality, making them powerful indicators of watershed health. As winter turns to spring and summer, here’s how “love in the watershed” unfolds across northern Michigan.
As soon as wetlands thaw in early spring, frogs and toads are often the first to announce the season. Breeding males gather at shallow wetlands and vernal pools, producing species-specific calls that females use to locate mates. These breeding sites are typically fish-free and highly sensitive to land use changes, making intact wetlands critical for amphibian reproduction. The timing and intensity of spring choruses are closely linked to temperature and precipitation, making them useful indicators of broader environmental conditions.
Not long after amphibians begin breeding, lake sturgeon move into fast-flowing rivers to spawn, typically in late May and early June. These long-lived fish migrate to clean cobble and gravel substrates where eggs can attach and develop in oxygen-rich water. Females may not reproduce until they are 20–30 years old and then only once every several years, making successful spawning events especially important for population recovery. Because sturgeon require unobstructed river access and high-quality habitat, their reproductive success reflects the condition of entire river systems.
As waters warm into early summer, dragonflies and damselflies emerge from aquatic larval stages and begin the mating process along rivers, lakes, and wetlands. Males patrol the air for females, grasping them mid-flight and forming distinctive heart-shaped “mating wheels”, sometimes while perched, other times in flight. Eggs are laid directly into water or aquatic vegetation. Since their larvae live underwater for months or even years, dragonflies depend on clean, well-oxygenated habitats throughout much of their life cycle and are widely used as indicators of aquatic ecosystem health.
Later in summer and into fall, crayfish engage in courtship when females release chemical signals that attract males. After mating, females carry fertilized eggs beneath their tails through the winter, releasing fully formed juveniles the following spring. Crayfish are sensitive to sedimentation, low dissolved oxygen, and pollutants, so their presence and successful reproduction provide valuable insight into stream and lake health.
Healthy watersheds support every stage of aquatic life, from courtship and spawning to juvenile development and migration. As winter transitions into spring, keep an eye, and an ear, out for these seasonal behaviors unfolding across northern Michigan. They’re some of the clearest signs that our waters are healthy.
Stop by the Watershed Discovery Center at 426 Bay Street in Petoskey to see some of these aquatic animals face-to-face!
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