I study the evolutionary and ecological consequences of seasonality. During my PhD, I used an experimental model system, Drosophila melanogaster, to simulate two distinct breeding and non-breeding seasons and mathematical models to examine the ecological consequences of seasonality. I found that the interaction between seasonal density dependence and individual, non-lethal carry-over effects caused by variation in non-breeding density affects breeding output, which can stabilize long-term population dynamics. I also showed how variation in parental breeding density negatively influenced offspring size, and how this carried over to influence offspring survival during the non-breeding season. For my postdoc, I am using the same lab system to investigate how the interplay between fluctuations in density and life-history trade-offs between seasons (i.e. eco-evolutionary dynamics) causes long cycles (~10 generations), which has never been observed in aseasonal populations of fruit flies.
Betini, GS, Pardy, A, Griswold, CK & Norris, DR. 2015. Causes and consequences of density-dependent dispersal: the role of seasonality and carry-over effects. In press: Ecosphere
Betini, GS, Fitzpatrick, MJ & Norris, DR. 2015. Experimental evidence for the effect of habitat loss on the dynamics of migratory networks. Ecology Letters 18: 526-534.
Betini, GS, Griswold, CG, Prodan, L & Norris, DR. 2014. Body size, carry-over effects, and survival in a seasonal environment: consequences for population dynamics. Journal of Animal Ecology 83: 1313-1321.
Betini, GS, Griswold, CG & Norris, DR. 2013. Density-mediated carry-over effects explain variation in breeding output across time in a seasonal population. Biology Letters 9(5): 20130582.
Betini, GS, Griswold, CG & Norris, DR. 2013. Carry-over effects, sequential density dependence and the dynamics of populations in a seasonal environment. Proceedings of the Royal Society, London: Biological Sciences 280: 20130110.
Betini, GS & Norris, DR. 2012. The relationship between personality and plasticity in Tree swallow aggression and the consequences for reproductive success. Animal Behaviour 83: 137-143
Betini, GS, Hobson, KA, Wassenaar, L & Norris, DR. 2009. Stable-hydrogen isotope values in songbird nestlings: effects of temperature, body size, and diet. Canadian Journal of Zoology 87: 767-772.
Accordi, IA, Betini, GS, Barcellos-Silveira, A & Pacheco, JF. 2005. Digital Bibliography of Brazilian Ornithology V. Revista Brasileira de Ornitologia 13:199-207
Accordi, IA, Barcellos-Silveira, A, Pacheco, JF, Betini, GS. 2005. Digital Bibliography of Brazilian Ornithology IV. Ararajuba 13: 117-121.
Accordi, IA, Barcellos-Silveira, A, Pacheco, JF, Betini, GS. 2004. Bibliografia Digital da Ornitologia Brasileira III. Ararajuba 12: 159-164.
Nunes, MFC, Betini, GS. 2002. Métodos de estimativa e abundância de psitacídeos. In Galetti, M. e Pizo, M.A. Ecologia e conservação de psitacídeos no Brasil. Melapsittacus Publicações Científicas. Belo Horizonte-MG. 235 p.
Betini, GS, Pacheco, JF, Aleixo, A, Lima, FCT. 1998. New records extend the know range of the Henna-capped Foliage-glenaer (Hylocryptus rectirostris) southeastward (Passeriformes: Furnariidae). Ararajuba 6: 145-146.