The strength of weak ties and helminth parasitism in giraffe social networks

Kimberly L. Vanderwaal, Vincent Obanda, George P. Omondi, Brenda Mccowan, Hui Wang, Hsieh Fushing, Lynne A. Isbell

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The so-called "strength of weak ties" is a central concept in social network theory, especially for understanding how information and diseases are transmitted through socially structured populations. In general, weak ties occur in networks where relatively few individuals are responsible for maintaining linkages between groups of individuals that would otherwise be poorly connected. This common structural motif can be seen in the social networks of species with fission-fusion social organization, such as giraffe (Giraffa camelopardalis). Giraffe social networks are characterized by social cliques in which individuals associate more with members of their own social clique than with those outside their clique. Individuals involved in weak, between-clique social interactions are hypothesized to serve as bridges by which an infection may enter a clique and, hence, may experience higher infection risk. Here, we address this and other hypotheses explaining helminth infection patterns in wild giraffe, exploring the relative roles of the social network and ranging behavior in determining infection risk. We show that infection risk is more influenced by weak ties with individuals outside one's clique than by repeated contact with a core set of associates. Even when controlling for age and home range size, individuals who engaged in more between-clique associations, that is, those with multiple weak ties, were more likely to be infected with gastrointestinal helminth parasites. Our results suggest that diverse social interactions with giraffe from multiple cliques may increase exposure to pathogens. The importance of weak ties in pathogen transmission has only rarely been empirically demonstrated in wildlife.

Original languageEnglish (US)
Pages (from-to)1190-1197
Number of pages8
JournalBehavioral Ecology
Volume27
Issue number4
DOIs
StatePublished - 2016

Fingerprint

Giraffa camelopardalis
social networks
social network
parasitism
helminths
infection
helminthiasis
pathogen
pathogens
social structure
social organization
wildlife
home range
range size
parasite
parasites

Keywords

  • African ecosystems
  • animal behavior
  • centrality
  • contact rates
  • disease ecology
  • epidemiology
  • parasite transmission
  • ranging behavior
  • social network analysis
  • social structure
  • wildlife

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

Cite this

Vanderwaal, K. L., Obanda, V., Omondi, G. P., Mccowan, B., Wang, H., Fushing, H., & Isbell, L. A. (2016). The strength of weak ties and helminth parasitism in giraffe social networks. Behavioral Ecology, 27(4), 1190-1197. https://doi.org/10.1093/beheco/arw035

The strength of weak ties and helminth parasitism in giraffe social networks. / Vanderwaal, Kimberly L.; Obanda, Vincent; Omondi, George P.; Mccowan, Brenda; Wang, Hui; Fushing, Hsieh; Isbell, Lynne A.

In: Behavioral Ecology, Vol. 27, No. 4, 2016, p. 1190-1197.

Research output: Contribution to journalArticle

Vanderwaal, KL, Obanda, V, Omondi, GP, Mccowan, B, Wang, H, Fushing, H & Isbell, LA 2016, 'The strength of weak ties and helminth parasitism in giraffe social networks', Behavioral Ecology, vol. 27, no. 4, pp. 1190-1197. https://doi.org/10.1093/beheco/arw035
Vanderwaal, Kimberly L. ; Obanda, Vincent ; Omondi, George P. ; Mccowan, Brenda ; Wang, Hui ; Fushing, Hsieh ; Isbell, Lynne A. / The strength of weak ties and helminth parasitism in giraffe social networks. In: Behavioral Ecology. 2016 ; Vol. 27, No. 4. pp. 1190-1197.
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