Nectar guide
- Pronunciation
- /NEK-tur guide/
- Category
- Ecology
- Singular
- nectar guide
- Plural
- nectar guides
Definition
A visible pattern on a flower, typically in ultraviolet (UV) wavelengths or contrasting colors, that directs toward nectar, pollen, or other floral rewards. These markings function as visual signals that reduce search time and improve foraging for pollinators capable of detecting them.
Etymology
From Latin nectar (drink of the gods, hence flower secretion) + guide (one who shows the way), referring to the pattern's directing function.
Example
The common marsh marigold (Caltha palustris) displays UV-absorbing nectar guides visible to but not to human observers; bumblebees (Bombus spp.) use these patterns to locate nectar deposits rapidly, reducing handling time per flower.
Synonyms
- floral guide
- honey guide
- pollen guide
Related Terms
- pollination syndrome
- UV reflectance
- floral display
- foraging efficiency
- pollinator deception
Usage Notes
The term "nectar guide" is sometimes criticized as overly specific, since the same patterns may direct to pollen or other rewards rather than nectar alone; "floral guide" is increasingly preferred in technical literature for this reason. The patterns are often invisible to humans without UV photography. Not all nectar guides are UV-based—some rely on visible color contrasts. The presence and complexity of nectar guides correlate with pollinator visual systems: -pollinated flowers typically have UV patterns, while bird-pollinated flowers rarely do.