alexwild > Portrait of a mutualism: a swollen-thorn Acacia with the ants that protect it.  The hundreds of thorns on a mature tree can house colonies of up to 20,000 ants.

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alexwild > In exchange for protection, swollen-thorn Acacia trees provide Pseudomyrmex ants with food and shelter.  Here an ant harvests a protein-rich food body that will be fed to the ants' larvae. Panama.

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alexwild > Pseudomyrmex spinicola acacia ants guarding a nest entrance.  This species has a painful sting and a much more aggressive temperment than most other Pseudomyrmex, an effective deterrent to large vertebrate herbivores.  Panama.

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alexwild > Cutting open the surprisingly soft flesh of an Acacia thorn reveals larvae and pupae of the Pseudomyrmex acacia ant.  Panama.

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alexwild > Friend or Foe? Two Pseudomyrmex spinicola acacia ant nestmates evaluate each other at the nest entrance. Panama.

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alexwild > A Pseudomyrmex spinicola  acacia ant pauses outside the nest entrance.  The ants cut a circular entrance hole to gain access to the inside of the hollow thorn. Panama.

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alexwild > A Cecropia tree grows into a gap in the Panamanian rainforest.  These fast-growing trees house colonies of fierce Azteca ants that protect the tree from herbivores.

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alexwild > Philidris workers guarding the entrance to their nest in a Myrmecodia ant-plant.  Australia.

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alexwild > An epiphytic Myrmecodia ant-plant in an Australian woodland.  The swollen base of this plant is hollow, with an intricate gallery of chambers that house aggressive Philidris ants.  The ants defend the plant (not very effectively in this case, judging from the holes in the leaves), and provide the plant with nutrients.

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Portrait of a mutualism: a swollen-thorn Acacia with the ants that protect it. The hundreds of thorns on a mature tree can house colonies of up to 20,000 ants.

filename: spinicola14
alexwild > Portrait of a mutualism: a swollen-thorn Acacia with the ants that protect it.  The hundreds of thorns on a mature tree can house colonies of up to 20,000 ants.

filename: spinicola14
Portrait of a mutualism: a swollen-thorn Acacia with the ants that protect it. The hundreds of thorns on a mature tree can house colonies of up to 20,000 ants.

filename: spinicola14
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all images and text © Alex Wild 2008

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