How does the short polar summer limit plant growth and animal activity?

The short polar summer is a defining constraint on polar ecosystems, as it dictates the limited window available for biological productivity.12

Impact on Plant Growth

The growing season in polar regions is typically less than 100 days. This brevity forces plants to adopt rapid life cycles; many species initiate growth while snow is still present and complete their flowering and seed stages in as little as six weeks. Because the season is so short, annual plants are rare, and many perennials reproduce asexually. Furthermore, cooler summer temperatures slow the decomposition of organic material, which limits the release of essential soil nutrients. Plant growth is also restricted by the distribution of snow, as areas with little cover may suffer from summer drought, while areas with late-melting snowbanks support only those species adapted to a significantly shortened growing season.231

Impact on Animal Activity

The limited summer season restricts the period during which insects and other invertebrates can be active, which in turn influences the entire food web. Many animals must time their reproductive cycles to coincide with this brief window of peak productivity. For example, predator breeding often depends on the availability of prey, which fluctuates based on seasonal conditions. Additionally, the short summer forces many species to live close to their biological limits, making them highly vulnerable to extreme weather events that can cause population declines or local extinctions.14