ArticleBiology letters2019
At the invasion front, male cane toads (Rhinella marina) have smaller testes.
Article in Biology letters, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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5 citing papers in PubMed, 14 citations in OpenAlex.
- Behavioural, morphological and life-history adjustments in the early steps of colonising restricted semi-natural environments in wild house mice.BMC ecology and evolution · 2026Article
- Vasoconstrictor and hemodynamic effects of a methanolic extract from Rhinella marina toad poison.Toxicon : official journal of the International Society on Toxinology · 2022Article
- Differences in morphology and in composition and release of parotoid gland secretion in introduced cane toads (Ecology and evolution · 2021Article
- Tradeoffs between dispersal and reproduction at an invasion front of cane toads in tropical Australia.Scientific reports · 2020Article
- At the invasion front, male cane toads (Rhinella marina) have smaller testes.Biology letters · 2019Article
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Authors and funding
2 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
As a colonizing species expands its range, individuals at the invasion front experience different evolutionary pressures than do those at the range-core. For example, low densities at the edge of the range mean that males should rarely experience intense sperm competition from rivals; and investment into reproduction may trade-off with adaptations for more rapid dispersal. Both of these processes are predicted to favour a reduction in testis size at the invasion front. To explore effects of invasion stage in Australian cane toads (Rhinella marina), we collected and dissected 214 adult males from three regions: one in the species' range-core (northeastern Australia), and two from invasion fronts (one in northwestern Australia and one in southeastern Australia). Despite the brief duration of separation between toads in these areas (approx. 85 years), testis masses averaged greater than 30% higher (as a proportion of body mass) in range-core males than in conspecifics sampled from either vanguard of the invasion. Previous work has documented low reproductive frequencies in female cane toads at the invasion front also, consistent with the hypothesis that evolutionary and ecological pressures unleashed by an invasion can favour relatively low resource allocation to reproduction in both sexes.
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