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Insectes Sociaux

, Volume 61, Issue 4, pp 357–365 | Cite as

Funnels, gas exchange and cliff jumping: natural history of the cliff dwelling ant Malagidris sofina

  • J. A. HelmsIV
  • C. Peeters
  • B. L. Fisher
Research Article

Abstract

The Malagasy endemic ant Malagidris sofina (Bolton and Fisher 2014) nests on cliff faces in natural rock alcoves or clay banks. Colonies have single ergatoid queens and reproduce by fission. Each nest has a funnel-shaped entrance that projects horizontally from the cliff face. We examine three hypotheses for the function of the funnels—water exclusion, gas exchange and defense. Entrance funnels are relatively impermeable and divert water from nests, but simple tubes would achieve the same result. Consistent with the gas exchange hypothesis, projected funnel entrances likely increase gas exchange rates over sixfold compared to simple tubes and may increase air flow within the nest. Gas exchange may explain the recurrent evolution of funnel entrances in several ant lineages, especially among cliff dwelling species. We outline M. sofina defense responses to conspecifics and co-occurring ant species, and find no support for a defense role of entrance funnels. Workers display little aggression but respond to several species with an original form of nest defense––cliff jumping—in which workers drop off the cliff face while clinging to invaders and then return to their nest. M. sofina is a restricted range species under threat of extinction by habitat destruction. Its novel lifestyle underscores the urgency of exploration and conservation in a tropical biodiversity hotspot.

Keywords

Cliff dwelling Cliff jumping Madagascar Malagidris sofina Nest entrance Nest ventilation 

Notes

Acknowledgments

We thank the Republic of Madagascar and local communities for allowing us to work on Galoko. The fieldwork on which this study is based could not have been completed without the gracious support of the Malagasy people and the Arthropod Inventory Team (Balsama Rajemison, Jean Claude Rakotonirina, Jean-Jacques Rafanomezantsoa, Chrislain Ranaivo, Hanitriniana Rasoazanamavo, Nicole Rasoamanana, Clavier Randrianandrasana). Rosemary Knapp at the University of Oklahoma granted us the use of her lab. Flavia Esteves provided a helpful reference. The expedition was funded in part by National Science Foundation Grant No DEB-0842395. JAH is funded by a National Science Foundation Graduate Research Fellowship and a University of Oklahoma Alumni Fellowship.

Supplementary material

Supplementary material 1 (MP4 44462 kb)

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Copyright information

© International Union for the Study of Social Insects (IUSSI) 2014

Authors and Affiliations

  1. 1.Department of BiologyUniversity of OklahomaNormanUSA
  2. 2.Écologie et Sciences de l’Environnement, UMR CNRS 7818, Université Pierre Et Marie CurieParisFrance
  3. 3.Department of EntomologyCalifornia Academy of SciencesSan FranciscoUSA

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