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Related Concept Videos

Formation of Species01:31

Formation of Species

Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.
Pollination and Flower Structure02:40

Pollination and Flower Structure

Flowers are the reproductive, seed-producing structures of angiosperms. Typically, flowers consist of sepals, petals, stamens, and carpels. Sepals and petals are the vegetative flower organs. Stamens and carpels are the reproductive organs.
Epiphytes, Parasites, and Carnivores02:40

Epiphytes, Parasites, and Carnivores

Plants often form mutualistic relationships with soil-dwelling fungi or bacteria to enhance their roots’ nutrient uptake ability. Root-colonizing fungi (e.g., mycorrhizae) increase a plant’s root surface area, which promotes nutrient absorption. While root-colonizing, nitrogen-fixing bacteria (e.g., rhizobia) convert atmospheric nitrogen (N2) into ammonia (NH3), making nitrogen available to plants for various biological functions. For example, nitrogen is essential for the biosynthesis of the...
Symbiosis00:58

Symbiosis

Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
Asexual Reproduction02:38

Asexual Reproduction

Asexual reproduction allows plants to reproduce without growing flowers, attracting pollinators, or dispersing seeds. Offspring are genetically identical to the parent and produced without the fusion of male and female gametes.
Frequency-dependent Selection01:21

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.

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Related Experiment Video

Updated: May 29, 2026

Field Experiments of Pollination Ecology: The Case of Lycoris sanguinea var. sanguinea
07:19

Field Experiments of Pollination Ecology: The Case of Lycoris sanguinea var. sanguinea

Published on: November 25, 2016

Asynchronous diversification in a specialized plant-pollinator mutualism.

Santiago R Ramírez1, Thomas Eltz, Mikiko K Fujiwara

  • 1Museum of Comparative Zoology, Harvard University, Cambridge, MA 02138, USA. sramirez@post.harvard.edu

Science (New York, N.Y.)
|September 24, 2011
PubMed
Summary

Orchids and bees form crucial pollination partnerships. This study reveals orchids evolved fragrance to attract bees, not co-evolve with them, suggesting pollination diversity relies on existing bee senses.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Botany

Background:

  • Mutualistic relationships between flowering plants and insect pollinators are vital for plant reproduction.
  • The evolutionary origins of these plant-pollinator interactions are not fully understood.
  • Specialized interactions, like those between orchids and bees, offer insights into co-evolutionary processes.

Purpose of the Study:

  • To investigate the evolutionary history and diversification of specialized orchids and their bee pollinators.
  • To test the hypothesis of co-evolution by race formation versus other evolutionary scenarios.
  • To understand the drivers of diversification in plant-pollinator networks.

Main Methods:

  • Phylogenetic analyses to reconstruct divergence times and diversification patterns.
  • Analysis of interaction networks between orchids and bees.
  • Simulation of co-extinction cascades to assess network stability and dependency.
  • Chemical ecology analysis of orchid fragrances and bee sensory biases.

Main Results:

  • Fragrance-producing orchids evolved independently at least three times, after their bee pollinators.
  • Orchid diversification appears to have followed bee pollinator diversification.
  • Bee pollinators showed a dependency on the diverse chemical environment of neotropical forests, rather than reciprocal specialization with orchids.
  • Simulated co-extinction cascades indicated asymmetrical dependencies within the interaction networks.

Conclusions:

  • The diversification of insect-pollinated angiosperms may be driven by the exploitation of pre-existing sensory biases in pollinators.
  • Asymmetrical dependencies, rather than strict co-evolution, may characterize many plant-pollinator relationships.
  • The evolution of plant pollination systems is influenced by the sensory ecology of their insect partners.