Geographic range-scale assessment of species conservation status: A framework linking species and landscape features

27 de fevereiro de 2018

fev 27, 2018

Ludmila Rattis, Ricardo Dobrovolski, Maurício Talebi, Rafael Loyola

The concept of habitat and spatial extent are key features in landscape ecology. A non-precise definition of habitat and the wrong choice of the scale can affect model outcomes and our understanding about population conservation status. We proposed a framework and applied to five species representing different ecological profiles (1) to model species occurrences and (2) to evaluate habitat structure at nine different scale extents from local landscapes to entire species range. Then, we (3) evaluated the scale sensitivity of each metric and (4) assessed if the scale sensitivity of each metric changed according to species. Our model was succesfull in predicting species occurrence for all species. When we applied deductive suitability models, the total area of remaining habitat varied from 83% to 12% of the original extension of occurrence. On average, the proportion of habitat amount, fragmentation, and carrying capacity decreased and functional increased as scale extent increased. Habitat amount and fragmentation assessed locally would show the same pattern across species’ range, but carrying capacity and functional connectivity – which consider biological features – were affected by the choice of scale.

Also, the inclusion of species preferences on habitat modeling diminished commission errors arising from landscape-scale underestimation of species’ occurrences. Local landscapes samples were not able to represent species’ entire range feature and the way that individuals reach the remaining habitat depends on species’ features. Species conservation status should be assessed preferably at the range scale and include species biological features as an additional factor determining species occupancy inside geographic ranges.

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Este projeto está alinhado aos Objetivos de Desenvolvimento Sustentável (ODS).

Saiba mais em brasil.un.org/pt-br/sdgs.

Veja também

See also

Large-scale impoverishment of Amazonian forests by logging and fire

Large-scale impoverishment of Amazonian forests by logging and fire

Amazonian deforestation rates are used to determine human effects on the global carbon cycle and to measure Brazil's progress in curbing forest impoverishment. But this widely used measure of tropical land use tells only part of the story. Here we present field surveys of wood mills and forest burning across Brazilian Amazonia which show that logging crews severely damage 10,000 to 15,000 km2 yr−1 of forest that are not included in deforestation mapping programmes.

Guia do capacitador

Guia do capacitador

Este material é um Guia para os técnicos, participantes no Programa CapGestão Amazônia. Ele apresenta, de forma rápida e sistemática, um conjunto de ferramentas que poderá apoiar no desenho e implementação das oficinas pelos (as) técnicos (as) com os grupos locais (grupos informais, Associações e Cooperativas).