Concept

Pollinator

An animal that moves pollen between flowers, enabling plant sexual reproduction. Bees are the dominant group (>20,000 species globally; ~4,000 in North America), but pollinators include butterflies, moths, beetles, flies, wasps, ants, hummingbirds, bats, lemurs, and (in rare cases) lizards. Pollinator diversity matters for ecosystem function: different pollinators specialize in different flower types, bloom times, and weather conditions. A landscape with many pollinator species is more reliably pollinated than one with few — even if the few are abundant. The decline of pollinator populations and diversity is among the most-documented and most-consequential ecological changes of the late 20th and 21st centuries.

Major groups

Bees (Apoidea, ~20,000+ species globally; ~4,000 in North America) — the dominant pollinator group on most continents. Honeybees, bumblebees, mason bees, leafcutter bees, mining bees, sweat bees, carpenter bees. Most are solitary — single females nesting alone, not in colonies. Honeybees are the exception, not the rule.
Butterflies and moths (Lepidoptera, ~180,000 species globally) — major pollinators of long-tubed flowers (butterfly-bush, milkweed, phlox; night-blooming flowers for moths)
Flies (Diptera) — second-most-important pollinator group after bees by some measures; especially important in cool-season pollination, in Arctic and high-altitude systems, and for some specific plants (carrots, onions, paw-paws)
Beetles (Coleoptera) — among the oldest pollinator groups (predating most bees evolutionarily); pollinate magnolias, water lilies, and many tropical species
Wasps and ants — minor but real pollinators of specific systems
Hummingbirds — major pollinators of red, tubular, scentless flowers in the Americas (340 species)
Bats (~500 plant species globally rely on bat pollination) — agave, cacti, durian, balsa, kapok; mostly tropical
Other vertebrates — some lemurs, lizards, marsupials, primates pollinate specific plants in specific regions

Why diversity matters

A landscape with one abundant pollinator and a landscape with many less-abundant pollinators may have similar total pollinator biomass but very different pollination outcomes:

Different flowers — many crop species are not effectively pollinated by honeybees alone (squash, [[blueberry|blueberry]], tomato, [[cranberry|cranberry]] — all need native bee species)
Different times — early-spring fruit-tree bloom often happens before [[honeybee|honeybee]] colonies are at full strength; mason bees and bumblebees fill this gap
Different conditions — bumblebees fly in cool, rainy weather when honeybees stay home
Resilience — disease, pesticide, or weather event affecting one species is less catastrophic when others can step up

Decline

Documented pollinator declines:

Honeybees — colony losses 30–40%/year typical in U.S. since the mid-2000s; recovery via colony splits but no fundamental health gain
Bumblebees — multiple species (rusty patched, American, Franklin’s) federally listed or critically endangered
Monarchs — eastern North American population down >80% since the 1990s
Insect biomass overall — multiple long-term studies (Krefeld 1989-2016, [[puerto-rico|Puerto Rico]], others) document 60–80% declines

Causes are multiple and interacting: habitat loss, pesticide use (especially neonicotinoids), monoculture cropping, disease/parasite (Varroa mite for honeybees), climate disruption.

Sources

The Bees in Your Backyard, Wilson and Carril (Princeton, 2015)
Pollinators in Crisis, Nabhan et al.
USDA Pollinator Health Strategy

Rooted in life.

What links here, and how

Inbound connections from across the wiki, grouped by lens and by relationship. These appear automatically — every entity page declares what it links to, and that data populates here on the targets.

Scientific

shares approach with

Southeastern blueberry bee blueberry bees are buzz-pollinators — significantly more efficient at blueberry pollination than honeybees
Pollinator decline pollinator decline is the population-level pattern affecting the pollinator community broadly
Squash bee squash bees are far more efficient at pollinating squash than honeybees per individual

subset of

Hawkmoth hawkmoths are the dominant pollinators of long-tubed night-blooming flowers across temperate and tropical ecosystems
Honeybee honeybees are one of ~20,000 bee species globally; they are unusually social (colony-living) compared to most native bees, which are solitary
Hover fly hover flies are second only to bees as pollinator group in many ecosystems
Leafcutter bee principal commercial pollinator of alfalfa seed; major pollinator of legumes, sunflowers, and native wildflowers
Mason bee among the most-efficient pollinators of fruit trees per individual; widely used in commercial orchards
Mining bee major pollinators of fruit trees, willows, blueberries, and native early-spring flora
Native bees native bees are the largest single group of pollinators on most continents
Rusty-patched bumblebee rusty-patched bumblebee is one of multiple native bumblebee species in steep decline
Sweat bee abundant generalist pollinators of native wildflowers, garden plants, and many crops

threatens

Neonicotinoids neonicotinoids are toxic to bees, butterflies, and other pollinators at very low concentrations; documented driver of pollinator decline

substrate of

Pollination pollinators are the agents of pollination; the two concepts are complementary halves of the same biological process

Practical