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Pollination partnerships follow climate rather than one latitude rule

A global comparison of more than 3,400 plant–pollinator networks found no steady rise or fall in specialization toward the Equator. Climate explained many patterns better than latitude, biodiversity or productivity. Plants, insects and birds showed different relationships with temperature and rainfall, making one universal geographic rule a poor description of how these ecological partnerships are organized.

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A bee collecting pollen from a purple flower in a sunlit flowering field.

A global comparison finds no simple tropical gradient

A global analysis of plant–pollinator relationships found no simple increase in specialization toward the tropics. Temperature and rainfall explained many patterns better than latitude. The peer-reviewed study, published on September 30, compares the partners plants and pollinating animals depend on to reproduce and feed.[1], [2]

Specialization describes whether a plant or pollinator interacts with a narrow or broad set of partners. Researchers assembled more than 3,400 quantitative networks containing over 110,000 recorded interactions. The analysis draws on observed relationships, with geographic coverage and sampling methods affecting what the global comparison can capture.[1]

Plants and pollinators follow different geographic patterns

Specialization did not rise or fall steadily toward the Equator. Network-level and pollinator specialization peaked at low northern latitudes near the tropical–subtropical boundary. Plants followed a different pattern between hemispheres. Birds and insects also differed, so the same location could not be reduced to one uniform pattern of ecological dependence.[1]

Temperature and rainfall have distinct associations

Among the variables compared, climate was usually better supported than latitude, biodiversity or environmental productivity. Network-level specialization decreased with higher mean annual temperature. Plants were more specialized at intermediate rainfall but less specialized in the wettest locations; pollinators showed a different relationship at intermediate rainfall. These are observational associations across networks rather than experimental attribution of changes at one site.[1]

References

  1. News sourceNature Ecology & EvolutionPollination networks show no single specialization trend toward the Equator↩1↩2↩3↩4
  2. News sourceCharles UniversityClimate shapes specialization in global pollination networks↩
Space and explorationEnergy transition and climate

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