Behavioral Ecology and Sociobiology

, Volume 63, Issue 8, pp 1109–1118 | Cite as

Alternative mating tactics in the Italian treefrog, Hyla intermedia

  • Sergio CastellanoEmail author
  • Valentina Marconi
  • Valeria Zanollo
  • Giulia Berto
Original Paper


As in many lekking anurans, Italian treefrog males use two mating tactics: they can attract females by calling vigorously or be satellites, that is, they can remain silent in proximity of a calling male and try to intercept females attracted by their neighbour. We investigated the factors that affected the expression of this mating tactic. Consistent with the conditional mating tactic hypothesis, satellites were smaller than average and smaller than their parasitised calling males. They spent a larger-than-average number of nights at the breeding site, where most of them were also observed calling. Moreover, satellites showed lower call rates and lower mating success than those of males they parasitise but not lower than those of males they did not parasitise. Overall, these results, together with those derived from the analyses of the seasonal and spatial distribution of males, provide evidence for a non-random association between satellites and calling males and are consistent with the hypothesis that satellites have spectral and temporal acoustic preferences that parallel those of females. By adopting the less-successful satellite mating tactic, competitively inferior males can nevertheless maximise their potential reproductive fitness by sexually parasitising the most attractive chorusing males.


Conditional mating strategy Sexual parasitism Sexual selection Acoustic communication Mating success 



We thank the authority of “Parco della Valle del Ticino Piemontese” for logistic support and for permissions of catching and marking treefrogs. Cosimo Greco and Luigi Spagnolo (Politecnico of Turin) built the devise and wrote the software for the multi-channel recording. Many thanks to Alessandra Rosso, Marco Gamba and Luca Tontini for their help in the field recording and to two anonymous referees for their insightful comments on a first version of this manuscript.


  1. Andersson M (1994) Sexual selection. Princeton University Press, Princeton, NJGoogle Scholar
  2. Applied Ecology Research Group (2004) Guidelines for use of Live Amphibians and Reptiles in Field Research.
  3. Arak A (1988a) Callers and satellites in the natterjack toad: evolutionary stable decision rules. Anim Behav 36:416–432CrossRefGoogle Scholar
  4. Arak A (1988b) Female mate selection in the natterjack toad: active choice or passive attraction? Behav Ecol Sociob 22:317–327Google Scholar
  5. Backwell PRY, Passmore NI (1991) Satellite behavior in the Leaf-Folding Frog, Afrixalus delicatus. J Herpet 25:497–498CrossRefGoogle Scholar
  6. Buchan A, Sun L, Wagner RS (2005) Using Alpha Numeric Fluorescent Tags for individual identification of amphibians. Herpet Rev 36:43–44Google Scholar
  7. Castellano S, Cuatto B, Rinella R, Rosso A, Giacoma C (2002) The advertisement calls of the European treefrogs (Hyla arborea): a multilevel study of variation. Ethology 108:75–89CrossRefGoogle Scholar
  8. Castellano S, Rosso A (2006) Variation in call temporal properties and female preferences in Hyla intermedia. Behaviour 143:405–424CrossRefGoogle Scholar
  9. Castellano S, Rosso A (2007) Female preferences for multiple attributes in the acoustic signals of the Italian treefrog, Hyla intermedia. Behav Ecol Sociob 61:1293–1302CrossRefGoogle Scholar
  10. Castellano S, Zanollo V, Marconi V, Berto G (2009) The mechanisms of sexual selection in a lek-breeding anuran, Hyla intermedia. Anim Behav 77:213–224CrossRefGoogle Scholar
  11. Clarke RD (1972) The effect of toe-clipping on survival in Fowler’s toad, Bufo woodhousei fowleri. Copeia 1972:182–185CrossRefGoogle Scholar
  12. Dawkins R (1980) Good strategy or evolutionarily stable strategy? In Sociobiology: Beyond nature nurture, Barlow, G. W. and Silverberg, J. eds., Westview Press, pp. 331–367Google Scholar
  13. Faraway JJ (2006) Extending the Linear model with R. Chapman and Hall/CRC, Boca RatonGoogle Scholar
  14. Forester DC, Lykens DV (1986) Significance of Satellite Males in a Population of Spring Peepers (Hyla crucifer). Copeia 1986:719–724CrossRefGoogle Scholar
  15. Garton JS, Brandon RA (1975) Reproductive Ecology of the Green Treefrog, Hyla cinerea, in Southern Illinois (Anura: Hylidae). Herpetologica 31:150–161Google Scholar
  16. Gonçalves D, Oliveira R, Körner K, Schlupp I (2003) Intersexual copying by sneaker males of the peacock blenny. Anim Behav 65:355–361CrossRefGoogle Scholar
  17. Grafen A, Hails R (2002) Modern statistics for the life science. Oxford University Press, OxfordGoogle Scholar
  18. Gross MR (1996) Alternative reproductive strategies and tactics: diversity within sexes. Trends Ecol Evol 11:92–98CrossRefGoogle Scholar
  19. Haddad CFB (1991) Satellite behaviour in the Neotropical Treefrog Hyla minuta. J Herpet 25:226–229CrossRefGoogle Scholar
  20. Halliday T, Tejedo M (1995) Intrasexual selection and alternative mating behaviour. In: Heatwole H, Sullivan BK (eds) Amphibian Biology, Social Behaviour, vol 2. Surrey Beatty, Chipping Norton, pp 470–517Google Scholar
  21. Halliday TR, Verrel PA (1986) Body size and age in amphibians and reptiles. J Herpet 22:253–265CrossRefGoogle Scholar
  22. Henson SA, Warner RR (1997) Male and female alternative reproductive behaviors in fishes: a new approach using intersexual dynamics. Ann Rev Ecol Syst 28:571–592CrossRefGoogle Scholar
  23. Howard RD (1984) Alternative mating behaviors of young male bullfrogs. Am Zool 24:397–406Google Scholar
  24. Humfeld SC (2008) Intersexual dynamics mediate the expression of satellite mating tactics: unattractive males and parallel preferences. Anim Behav 75:205–215CrossRefGoogle Scholar
  25. Jennions MD, Petrie M (1997) Variation in mate choice and mating preferences: a review of causes and consequences. Biol Rev 72:283–327PubMedCrossRefGoogle Scholar
  26. Johnson JB, Omland KS (2004) Model selection in ecology and evolution. TREE 19:101–108PubMedGoogle Scholar
  27. Jörgensen B (1992) Growth and reproduction. In: Fedre ME, Burggren WW (eds) Environmental physiology of the amphibians. University of Chicago Press, Chicago, pp 439–466Google Scholar
  28. Krupa JJ (1989) Alternative mating tactics in the great plains toad. Anim Behav 37:1035–1043CrossRefGoogle Scholar
  29. Leary CJ, Fox DJ, Shepard DB, Garcia AM (2005) Body size, age, growth and alternative mating tactics in toads: satellite males are smaller but not younger than calling males. Anim Behav 70:663–671CrossRefGoogle Scholar
  30. Lucas JR, Howard RD (1995) On alternative reproductive tactics in anurans: dynamic games with density and frequency dependence. Am Nat 146:365–397CrossRefGoogle Scholar
  31. Lucas JR, Howard RD, Palmer JG (1996) Callers and satellites: chorus behaviour in anurans as a stochastic dynamic game. Anim Behav 51:501–518CrossRefGoogle Scholar
  32. Lüddecke H, Amezquita A (1999) Assessment of disc clipping on the survival and behavior of the Andean frog Hyla labialis. Copeia 1999:824–830CrossRefGoogle Scholar
  33. Manly BFJ (1991) Randomization and Monte Carlo methods in biology. Chapman and Hall, LondonGoogle Scholar
  34. McCarthy MA, Parris KM (2004) Clarifying the effect of toe clipping on frogs with Bayesian statistics. J Appl Ecol 41:780–786CrossRefGoogle Scholar
  35. Perrill SA, Gerhardt HC, Daniel R (1978) Sexual parasitism in the green treefrog (Hyla cinerea). Science 200:1179–1180PubMedCrossRefGoogle Scholar
  36. Perrill SA, Gerhardt HC, Daniel R (1982) Mating strategies shifts in male green treefrogs (Hyla cinerea): an experimental study. Anim Behav 30:43–48CrossRefGoogle Scholar
  37. R-Development Core Team (2007) R: A language and environment for statistical computing. R Foundation for Statistical Computing, ViennaGoogle Scholar
  38. Roble SM (1985) Observations on satellite males in Hyla chrysoscelis, Hyla picta, and Pseudacris triseriata. J Herpet 19:432–436CrossRefGoogle Scholar
  39. Rosso A (2003) Ciclo vitale, morfologia e canto nelle raganelle italiane: uno studio di variazione geografica, PhD thesis. University of Turin, ItalyGoogle Scholar
  40. Rosso A, Castellano S, Giacoma C (2004) Ecogeographic analysis of morphological and life-history variation in the Italian treefrog. Evol Ecol 18:303–321CrossRefGoogle Scholar
  41. Rosso A, Castellano S, Giacoma C (2006) Preferences for call spectral properties in Hyla intermedia. Ethology 112:599–607CrossRefGoogle Scholar
  42. Schluter D (1988) Estimating the form of natural selection on a quantitative trait. Evolution 42:849–861CrossRefGoogle Scholar
  43. Schluter D, Nychka D (1994) Exploring fitness surfaces. Am Nat 143:597–616CrossRefGoogle Scholar
  44. Sullivan BK (1989) Mating system variation in Woodhouse’s toad (Bufo woodhousii). Ethology 83:60–68CrossRefGoogle Scholar
  45. Waltz EC (1982) Alternative mating tactics and the law of diminishing returns: the satellite threshold model. Behav Ecol Sociob 10:75–83CrossRefGoogle Scholar
  46. Wells KD (1977a) The social behaviour of anuran amphibians. Anim Behav 38:666–693CrossRefGoogle Scholar
  47. Wells KD (1977b) Territoriality and male mating success in the green frog (Rana Clamitans). Ecology 58:750–762CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Sergio Castellano
    • 1
    Email author
  • Valentina Marconi
    • 1
  • Valeria Zanollo
    • 1
  • Giulia Berto
    • 1
  1. 1.Dipartimento di Biologia Animale e dell’UomoTurinItaly

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