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Research paper thumbnail of Boosting female hatchling production in endangered, male-biased turtle populations

Wildlife Society Bulletin, Oct 27, 2017

In turtle species with temperature-dependent sex determination, hatchling sex ratios skewed towar... more In turtle species with temperature-dependent sex determination, hatchling sex ratios skewed toward males could threaten populations where females are vulnerable to harvest. We tested the efficiency of black plastic covers in producing more female hatchlings from nests of the six-tubercle Amazon River turtle (Podocnemis sextuberculata) at the Mamirau a Reserve, Amazonas, Brazil during September to November 2003. Covered nests produced 37% more females and midnest average temperatures were 18 C higher than control nests. Incubation period was 3 days shorter, but survivorship was 12% lower in nests with black plastic. This technique could be an inexpensive, local alternative for short-term sex-ratio manipulation in endangered male-biased populations with temperature-dependent sex determination.

Research paper thumbnail of Conservation resource allocation, small population resiliency, and the fallacy of conservation triage

Conservation Biology, 2021

Some conservation prioritization methods are based on the assumption that conservation needs over... more Some conservation prioritization methods are based on the assumption that conservation needs overwhelm current resources and not all species can be conserved; therefore, a conservation triage scheme (i.e., when the system is overwhelmed, species should be divided into three groups based on likelihood of survival, and efforts should be focused on those species in the group with the best survival prospects and reduced or denied to those in the group with no survival prospects and to those in the group not needing special efforts for their conservation) is necessary to guide resource allocation. We argue that this decision‐making strategy is not appropriate because resources are not as limited as often assumed, and it is not evident that there are species that cannot be conserved. Small population size alone, for example, does not doom a species to extinction; plants, reptiles, birds, and mammals offer examples. Although resources dedicated to conserving all threatened species are insu...

Research paper thumbnail of Roteiro Para Inventários e Monitoramentos De Quelônios Continentais

Biodiversidade Brasileira - BioBrasil, Mar 7, 2016

This guide was materialized due to the lack of specific material for consultation that brings tog... more This guide was materialized due to the lack of specific material for consultation that brings together, in a unique single document, the main scientific references and the accumulation of technical knowledge about sampling methodologies, collection and analysis of population data, concerning to the continental Brazilians chelonians. This guide has been long expected by all the sectors of our society that are involved in this question. Thus, in this technical guide, we strive to reconcile, in methodological terms, the particularities of the species and environments that still have gaps of sampling and whose parameters are primarily related to inventories and populations monitoring process. Essentially, this guide is focused on procedures protocols that aim at the consolidation of the state-of-the-art of our technical and scientific knowledge. It is also focused on the integrated perspectives showed by all the leading research groups and conservation organizations that militate in favor of these animals. This is a very timely initiative as it surely represents a long-awaited instrumental and analytical standardization, and as it was already validated by the practical experience of the authors. The adoption of this practical methodology, if held in a convergent way by the various partner institutions and research groups, will enable the integration of different databases, and, also, will enable the compilation of all information which has been resulted from historical series of other related projects, in order to allow the comparative analysis of the variables involved in testudines researches and conservation, properly systematized in levels of species, taxonomic family, regions, biome, etc. In addition, this technical manual has the relevant purpose of stimulating characterization studies of the conservation status of these species, especially in protected areas, through the promotion of basic research relating to population dynamics of Brazilian continental chelonian species.

Research paper thumbnail of Biota Minas: diagnóstico do conhecimento sobre a biodiversidade no estado de Minas Gerais

O conteudo e apresentado em nove capitulos: Capitulo 1 - Introducao; Capitulo 2 - Metodologia; Ca... more O conteudo e apresentado em nove capitulos: Capitulo 1 - Introducao; Capitulo 2 - Metodologia; Capitulo 3 - Diagnosticos tematicos: Diversidade microbiana / Diversidade de organismos aquaticos / Diversidade de invertebrados terrestres; Capitulo 4 - Diversidade de vertebrados: Peixes / Anfibios / Repteis / Aves / Mamiferos; Capitulo 5 - Diversidade botânica: Pteridofitas / Fanerogamas; Capitulo 6 - Diversidade genetica; Capitulo 7 - Biotecnologia; Capitulo 8 - Colecoes biologicas: Colecoes zoologicas / Colecoes vivas-fauna / Herbarios / Colecoes vivas-flora; Capitulo 9 - Panorama das areas protegidas; Capitulo 10 - Sintese: Consulta ampla / Diretrizes finais / Estruturacao.

Research paper thumbnail of Boosting female hatchling production in endangered, male‐biased turtle populations

Wildlife Society Bulletin, 2017

In turtle species with temperature-dependent sex determination, hatchling sex ratios skewed towar... more In turtle species with temperature-dependent sex determination, hatchling sex ratios skewed toward males could threaten populations where females are vulnerable to harvest. We tested the efficiency of black plastic covers in producing more female hatchlings from nests of the six-tubercle Amazon River turtle (Podocnemis sextuberculata) at the Mamiraua Reserve, Amazonas, Brazil, during September to November 2003. Covered nests produced 37% more females and midnest average temperatures were 1° C higher than control nests. Incubation period was 3 days shorter, but survivorship was 12% lower in nests with black plastic. This technique could be an inexpensive, local alternative for short-term sex-ratio manipulation in endangered male-biased populations with temperature-dependent sex determination. © 2017 The Wildlife Society.

Research paper thumbnail of Livro vermelho da fauna brasileira ameaçada de extinção

Research paper thumbnail of Lista da fauna brasileira ameaçada de extinção: incluindo a Lista das espécies quase ameaçadas e deficientes em dados

... Lista da fauna brasileira ameaçada de extinção: incluindo a Lista das espécies quase ameaçada... more ... Lista da fauna brasileira ameaçada de extinção: incluindo a Lista das espécies quase ameaçadas e deficientes em dados. Autor(es): Machado, Angelo Barbosa Monteiro (edt.);Martins, Cássio Soares (edt.); Drummond, Gláucia Moreira (edt.). ...

Research paper thumbnail of Biota Minas: diagnóstico do conhecimento sobre a biodiversidade no Estado de Minas Gerais – subsídio ao Programa Biota Minas

Research paper thumbnail of Why we should aim for zero extinction

Trends in Ecology & Evolution

Research paper thumbnail of Boosting female hatchling production in endangered, male-biased turtle populations

Wildlife Society Bulletin, Oct 27, 2017

In turtle species with temperature-dependent sex determination, hatchling sex ratios skewed towar... more In turtle species with temperature-dependent sex determination, hatchling sex ratios skewed toward males could threaten populations where females are vulnerable to harvest. We tested the efficiency of black plastic covers in producing more female hatchlings from nests of the six-tubercle Amazon River turtle (Podocnemis sextuberculata) at the Mamirau a Reserve, Amazonas, Brazil during September to November 2003. Covered nests produced 37% more females and midnest average temperatures were 18 C higher than control nests. Incubation period was 3 days shorter, but survivorship was 12% lower in nests with black plastic. This technique could be an inexpensive, local alternative for short-term sex-ratio manipulation in endangered male-biased populations with temperature-dependent sex determination.

Research paper thumbnail of Conservation resource allocation, small population resiliency, and the fallacy of conservation triage

Conservation Biology, 2021

Some conservation prioritization methods are based on the assumption that conservation needs over... more Some conservation prioritization methods are based on the assumption that conservation needs overwhelm current resources and not all species can be conserved; therefore, a conservation triage scheme (i.e., when the system is overwhelmed, species should be divided into three groups based on likelihood of survival, and efforts should be focused on those species in the group with the best survival prospects and reduced or denied to those in the group with no survival prospects and to those in the group not needing special efforts for their conservation) is necessary to guide resource allocation. We argue that this decision‐making strategy is not appropriate because resources are not as limited as often assumed, and it is not evident that there are species that cannot be conserved. Small population size alone, for example, does not doom a species to extinction; plants, reptiles, birds, and mammals offer examples. Although resources dedicated to conserving all threatened species are insu...

Research paper thumbnail of Roteiro Para Inventários e Monitoramentos De Quelônios Continentais

Biodiversidade Brasileira - BioBrasil, Mar 7, 2016

This guide was materialized due to the lack of specific material for consultation that brings tog... more This guide was materialized due to the lack of specific material for consultation that brings together, in a unique single document, the main scientific references and the accumulation of technical knowledge about sampling methodologies, collection and analysis of population data, concerning to the continental Brazilians chelonians. This guide has been long expected by all the sectors of our society that are involved in this question. Thus, in this technical guide, we strive to reconcile, in methodological terms, the particularities of the species and environments that still have gaps of sampling and whose parameters are primarily related to inventories and populations monitoring process. Essentially, this guide is focused on procedures protocols that aim at the consolidation of the state-of-the-art of our technical and scientific knowledge. It is also focused on the integrated perspectives showed by all the leading research groups and conservation organizations that militate in favor of these animals. This is a very timely initiative as it surely represents a long-awaited instrumental and analytical standardization, and as it was already validated by the practical experience of the authors. The adoption of this practical methodology, if held in a convergent way by the various partner institutions and research groups, will enable the integration of different databases, and, also, will enable the compilation of all information which has been resulted from historical series of other related projects, in order to allow the comparative analysis of the variables involved in testudines researches and conservation, properly systematized in levels of species, taxonomic family, regions, biome, etc. In addition, this technical manual has the relevant purpose of stimulating characterization studies of the conservation status of these species, especially in protected areas, through the promotion of basic research relating to population dynamics of Brazilian continental chelonian species.

Research paper thumbnail of Biota Minas: diagnóstico do conhecimento sobre a biodiversidade no estado de Minas Gerais

O conteudo e apresentado em nove capitulos: Capitulo 1 - Introducao; Capitulo 2 - Metodologia; Ca... more O conteudo e apresentado em nove capitulos: Capitulo 1 - Introducao; Capitulo 2 - Metodologia; Capitulo 3 - Diagnosticos tematicos: Diversidade microbiana / Diversidade de organismos aquaticos / Diversidade de invertebrados terrestres; Capitulo 4 - Diversidade de vertebrados: Peixes / Anfibios / Repteis / Aves / Mamiferos; Capitulo 5 - Diversidade botânica: Pteridofitas / Fanerogamas; Capitulo 6 - Diversidade genetica; Capitulo 7 - Biotecnologia; Capitulo 8 - Colecoes biologicas: Colecoes zoologicas / Colecoes vivas-fauna / Herbarios / Colecoes vivas-flora; Capitulo 9 - Panorama das areas protegidas; Capitulo 10 - Sintese: Consulta ampla / Diretrizes finais / Estruturacao.

Research paper thumbnail of Boosting female hatchling production in endangered, male‐biased turtle populations

Wildlife Society Bulletin, 2017

In turtle species with temperature-dependent sex determination, hatchling sex ratios skewed towar... more In turtle species with temperature-dependent sex determination, hatchling sex ratios skewed toward males could threaten populations where females are vulnerable to harvest. We tested the efficiency of black plastic covers in producing more female hatchlings from nests of the six-tubercle Amazon River turtle (Podocnemis sextuberculata) at the Mamiraua Reserve, Amazonas, Brazil, during September to November 2003. Covered nests produced 37% more females and midnest average temperatures were 1° C higher than control nests. Incubation period was 3 days shorter, but survivorship was 12% lower in nests with black plastic. This technique could be an inexpensive, local alternative for short-term sex-ratio manipulation in endangered male-biased populations with temperature-dependent sex determination. © 2017 The Wildlife Society.

Research paper thumbnail of Livro vermelho da fauna brasileira ameaçada de extinção

Research paper thumbnail of Lista da fauna brasileira ameaçada de extinção: incluindo a Lista das espécies quase ameaçadas e deficientes em dados

... Lista da fauna brasileira ameaçada de extinção: incluindo a Lista das espécies quase ameaçada... more ... Lista da fauna brasileira ameaçada de extinção: incluindo a Lista das espécies quase ameaçadas e deficientes em dados. Autor(es): Machado, Angelo Barbosa Monteiro (edt.);Martins, Cássio Soares (edt.); Drummond, Gláucia Moreira (edt.). ...

Research paper thumbnail of Biota Minas: diagnóstico do conhecimento sobre a biodiversidade no Estado de Minas Gerais – subsídio ao Programa Biota Minas

Research paper thumbnail of Why we should aim for zero extinction

Trends in Ecology & Evolution