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High indirect fitness benefits for helpers across the nesting cycle in the tropical paper wasp Polistes canadensis

Research output: Contribution to journalArticle

Original languageEnglish
JournalMolecular Ecology
Early online date24 Jun 2019
DOIs
DateAccepted/In press - 17 May 2019
DateE-pub ahead of print (current) - 24 Jun 2019

Abstract

Explaining the evolution of helping behaviour in the eusocial insects where non-reproductive (‘worker caste’) individuals help raise the offspring of other individuals, remains one of the most perplexing phenomena in the natural world. Polistes paper wasps are popular study models, as workers retain the ability to reproduce: such totipotency is likely representative of the early stages of social evolution. Polistes is thought to have originated in the tropics, where seasonal constraints on reproductive options are weak and social groups are effectively perennial. Yet, most Polistes research has focused on non-tropical species, where seasonality causes family groups to disperse; cofoundresses forming new colonies the following spring are often unrelated, leading to the suggestion that direct fitness through nest inheritance is key in the evolution of helping behaviour. Here we present the first comprehensive genetic study of social structure across the perennial nesting cycle of a tropical Polistes – Polistes canadensis. Using both microsatellites and newly-developed single-nucleotide polymorphism (SNP) markers we show that adult cofoundresses are highly related, and that brood production is monopolised by a single female across the nesting cycle. Non-reproductive cofoundresses in tropical Polistes therefore have the potential to gain high indirect fitness benefits as helpers from the outset of group formation, and these benefits persist through the nesting cycle. Direct fitness may have been less important in the origin of Polistes sociality than previously suggested. These findings stress the importance of studying a range of species with diverse life-history and ecologies when considering the evolution of reproductive strategies.

    Research areas

  • inclusive fitness, polistes, relatedness, reproductive skew, single-nucleotide, polymorphisms (SNPs)

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    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Wiley at https://onlinelibrary.wiley.com/doi/full/10.1111/mec.15137. Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 898 KB, PDF-document

    Embargo ends: 24/06/20

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