Convergence

Unrelated species living in similar physical environments often are shaped by natural selection to have comparable morphological, physiological, or life history characteristics; they are said to evolve convergently (see The Rodent That Acts Like a Hippo). Convergence is a common feature of evolution and has major effects on the organization of biological communities. Interactions as well as characteristics can converge. Once an interaction evolves between two species, other species within the community may develop traits akin to those integral to the interaction, whereby the new species enters into the interaction. This type of convergence of species has occurred commonly in the evolution of mutualistic interactions, including those between pollinators and plants and those between vertebrates and fruits: some of the species drawn into the interaction become comutualists, contributing as well as benefiting from the relationship, whereas others become cheaters that only exploit the relationship (see above Interspecific interactions and the organization of communities: Mutualism and cheaters). Either way, these additional species may influence the future evolution of the interaction.

A clear example of this kind of convergence of species is that between flowers and hawkmoths. In the tropical dry forest of Cañas in northwestern Costa Rica, there are 65 hawkmoth species and 31 native plant species adapted for hawkmoth pollination. The hawkmoth species are all members of one moth family called the Sphingidae. They have diverged into many species from a common moth ancestor, and it is therefore not surprising that they share the same basic hawkmoth body plan. The plants adapted for hawkmoth pollination, however, are distributed throughout 14 plant families. These species have evolved convergently from different ancestors to have floral shapes that attract hawkmoths.

Mimicry complexes

A different kind of convergence has occurred in the evolution of mimetic butterflies and other insects. Mimicry occurs when two or more species evolve to resemble and sometimes behave in ways similar to another species (see also mimicry). The most famous examples of mimicry are found among insects, and they take two forms: Müllerian mimicry, in which two species evolve convergently to have a similar appearance, and Batesian mimicry, in which one species evolves to resemble another. These different forms of mimicry are named after their 19th-century discoverers, the naturalists Fritz Müller and Henry Walter Bates. In the several decades following the publication of Charles Darwin’s On the Origin of Species in 1859, mimicry was the major example used to show how evolution occurs through the mechanism of natural selection.

Müllerian mimicry can occur between two species that are distasteful to the same predators. Their predators learn to recognize and avoid distasteful prey by signals such as the colour patterns of wings. If two distasteful species develop the same colour pattern, the predator has to learn only one pattern to avoid, speeding up the learning process and providing an advantage to the convergent prey species. One of the distasteful species may initially model itself on the other, but, if they are almost equal in abundance, the species may coevolve and converge on some intermediate pattern. Heliconius butterflies in Central and South America form mimicry complexes of two or more species, and the colour patterns that result from this convergence vary geographically.

In Batesian mimicry a palatable species models itself on an unpalatable species to fool predators into believing that they are not tasty. Many flies have evolved to mimic bees, and some palatable butterflies have evolved to mimic unpalatable butterflies. If the mimic is uncommon, the convergence may not affect the unpalatable model, because it will be less likely that predators will consume many mimics by mistake and uncover the fraud. If the mimic, however, is abundant, its predators may eventually learn to dissociate its colour pattern with distastefulness because enough mimics would be inadvertently consumed and found palatable. Natural selection eventually would favour the evolution of a new colour pattern in the model species.