🌦️ How Weather and Climate Change Affect Honeybee Colonies

About this simulation

Bees run on a calendar written by flowers. A colony's spring buildup is timed so that the peak number of foragers is flying exactly when the countryside is in full bloom. That calendar is written jointly by two different clocks: flowering plants respond strongly to temperature, while honeybee colonies time their buildup more around day length and accumulated warmth together. When the climate warms, those two clocks can drift apart — flowers arrive earlier than the bees do, and the mismatch gets larger the more the climate warms.

How it works

• Each flower patch follows a bell-shaped bloom curve centred on a bloom peak day that shifts earlier as warming increases.
• The colony's foraging activity follows its own bell-shaped curve centred on a bee flight peak day that shifts earlier too, but much less than bloom does.
• The gap between the two peaks is the calendar mismatch — the more it grows, the fewer of the colony's peak foraging days actually overlap with peak bloom.
• Extreme weather (storms) grounds foragers outright for the day, regardless of bloom.
• Fragmenting the landscape shrinks and scatters the flower patches, adding a flight-distance energy cost on top of the timing mismatch.
• A colony energy reserve gauge integrates all of this day by day — nectar coming in during good overlap days, and metabolic cost draining it the rest of the time.

Controls

• Day of year — scrubs through the spring–summer season; auto-advance plays it automatically.
• Warming (+°C) — a climate warming scenario; pushes bloom timing earlier much faster than bee flight timing.
• Storm frequency — how often extreme-weather days occur and ground foraging entirely.
• Landscape fragmentation — thins out and scatters the flower patches, raising the energy cost of foraging.

Did you know?

Long-term phenology records show many spring-flowering plants now bloom one to three weeks earlier than they did a century ago, while pollinator emergence has shifted by a smaller amount — a real, measured example of the "calendar mismatch" modelled here.