There are several anuran´s reproductive modes and even among the related species, there areslight differences in the larvae development. Were propose to analyze the nest distribution ofHypsiboas faber, in insular environment, as well as evaluate the structural and ecological aspects.Were calculated the nest area correlating to the number of eggs, adjusting the variables to theunivariate straight-line equation, being the model tested through χ2. The density of nest distributionwas also evaluated, besides the abiotic data, such as dissolved oxygen, pH and nitrite. It wasobserved the fidelity to the reproductive area during three years consecutives until the completedestruction of the place to real state use. The species had used an area of 11.28 m2, of which thecenter was occupied by a permanent puddle of 4 m2 in the outer dune. In the first sample period, itwas found 23 nests, in the following period 15 and in the last period just 9 nests. Beyond the numberof nests, were also observed the reduction of the area of the built nest from 0.30 m2 to 0.18 m2, beingthis decline probably related to the human occupation, culminating with the complete eliminationof the reproductive area.Vários são os modos reprodutivos dos anuros e mesmo entre espécies proximamente relacionadashá diferenças sutis no desenvolvimento de suas larvas. Propõe-se aqui analisar a distribuição deninhos de Hypsiboas faber, em ambiente insular, bem como avaliar seus aspectos estruturais eecológicos. Calculou-se a área dos ninhos correlacionando-a com o número de ovos, ajustandoas variáveis à equação de reta univariada, sendo o modelo testado através do χ2. A densidade dedistribuição dos ninhos também foi avaliada, além de dados abióticos como oxigênio dissolvido, pHe nitrito. Observou-se a fidelidade ao sítio reprodutivo por três anos consecutivos até a destruiçãocompleta do local para uso imobiliário. A espécie usava uma área de 11,28 m2 cujo centro eraocupado por uma poça permanente de 4 m2 na região de antedunas. No primeiro períodoamostral encontrou-se 23 ninhos, no período seguinte 15 e no último apenas 9 ninhos. Além donúmero de ninhos, observou-se também uma diminuição da área do ninho construído de 0,30 m2para 0,18 m2 sendo este declínio provavelmente relacionado à ocupação humana, culminandocom a completa eliminação do sítio de reprodução. Ecological Aspects of Hypsiboas faber (Anura, Hylidae) reproduction onthe cove of Sítio Forte, Ilha Grande, Angra dos Reis, Brazil.AbstractThere are several anuran´s reproductive modes and even among the related species, there areslight differences in the larvae development. Were propose to analyze the nest distribution ofHypsiboas faber, in insular environment, as well as evaluate the structural and ecological aspects.Were calculated the nest area correlating to the number of eggs, adjusting the variables to theunivariate straight-line equation, being the model tested through χ2. The density of nest distributionwas also evaluated, besides the abiotic data, such as dissolved oxygen, pH and nitrite. It wasobserved the fidelity to the reproductive area during three years consecutives until the completedestruction of the place to real state use. The species had used an area of 11.28 m2, of which thecenter was occupied by a permanent puddle of 4 m2 in the outer dune. In the first sample period, itwas found 23 nests, in the following period 15 and in the last period just 9 nests. Beyond the numberof nests, were also observed the reduction of the area of the built nest from 0.30 m2 to 0.18 m2, beingthis decline probably related to the human occupation, culminating with the complete eliminationof the reproductive area.