O valor de existência de um ecossistema costeiro tropical através da disposição ao trabalho voluntário: o caso da lagoa de Itaipu (Niterói,RJ)

Abstract

Propõe-se que os valores de uso de recursos naturais identificados devem ser complementados por investigações sobre a importância que os cidadãos comuns atribuem aos ecossistemas. Isso implica em computar o valor de existência, que inclui componentes subjetivos da cultura. Aplicando o Método de Valoração Contingente (MVC) e agregando a ele o componente do trabalho voluntário, o texto estima o valor de existência de um ecossistema, comparando a Disposição a Pagar (DAP) com a Disposição ao Trabalho Voluntário (DATv) pela recuperação e/ou preservação da laguna de Itaipu, Niterói, Rio de Janeiro, Brasil. As cifras encontradas foram R$5.563.320,00 usando a DAP e R$19.980.000,00 usando DATv, revelando um significativo diferencial atribuível à disposição a trabalhar voluntariamente.

Valuation of the Aroeira (Myracrodruon urundeuva Allemão): perspectives on conservation

“…Th e relatively low values of WTP found in this study (when compared to the above research) may be due to the low purchasing power of most of the interviewees (Table 1). However, the number of people willing to pay for a conservation proposal was high when compared to other studies (Hildebrandt et al 2002;Fonseca & Drummond 2003;Kniivila 2006;Mattos et al 2007). Few authors have obtained results for WTP close to 80% in their research (Braga & Abdallah 2003;Amirnejad et al 2006).…”

“…Th e contingent valuation simulates a hypothetical market scenario in which the interviewees maximum willingness to pay (WTP) for a particular environmental asset can be determined (Ortiz 2003;Motta 2006;Marta-Pedroso et al 2007;Sattout et al 2007). Th is research instrument was designed to be as realistic as possible and thus capture a more reliable WTP value (Nogueira & Medeiros 1999;Sanchez & Perez 2000;Aguirre et al 2002;Fonseca & Drummond 2003;Mattos & Mattos 2004).…”

“…Before the beginning of each interview, the interviewee was asked whether he/she knew about the aroeira tree. Knowledge of the plant, regardless of whether the interviewee had used it, was essential for participating in the interview, as some authors argue that a lack of knowledge on the resource in question may lead to inaccurate results (Sanchez & Perez 2000;Fonseca & Drummond 2003;Mattos & Mattos 2004;Kniivila 2006).…”

“…For example, Mattos et al (2007) assessed the Permanent Preservation Area in the Ribeirão São Bartolomeu watershed and reported an average WTP of R$ 27.98 per month among respondents. Fonseca and Drummond (2003) reported that a sample of local residents would be willing to pay approximately R$ 12.53 per month for the conservation of Laguna de Itaipu, in Niterói, RJ. Th e relatively low values of WTP found in this study (when compared to the above research) may be due to the low purchasing power of most of the interviewees (Table 1).…”

“…Several researchers around the world have utilized contingent valuation to estimate the economic value of parks, forests and even biological species (Bandara & Tisdell 2004;Bateman & Mawby 2004;Amirnejad et al 2006;Montgomery & Helvoigt 2006;MartaPedroso et al 2007;Salttout et al 2007). Th is methodology has also been applied to evaluate resources in Brazil and thus can help facilitate the implementation of conservation projects (Braga & Abdallah 2003;Fonseca & Drummond 2003;Fernandez & Kuwahara 2005;Pereira & Campos 2005;Adams et al 2008;Máximo et al 2009).…”