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HOW STRONG IS THE RELATIONSHIP BETWEEN RAINFALL VARIABILITY AND CAATINGA PRODUCTIVITY? A CASE STUDY UNDER A CHANGING CLIMATE Anais da ABC (AABC)
SALIMON,CLEBER; ANDERSON,LIANA.
ABSTRACT Despite the knowledge of the influence of rainfall on vegetation dynamics in semiarid tropical Brazil, few studies address and explore quantitatively the various aspects of this relationship. Moreover, Northeast Brazil is expected to have its rainfall reduced by as much as 60% until the end of the 21st Century, under scenario AII of the IPCC Report 2010. We sampled and analyzed satellite-derived monthly rainfall and a vegetation index data for 40 sites with natural vegetation cover in Paraíba State, Brazil from 2001 to 2012. In addition, the anomalies for both variables were calculated. Rainfall variation explained as much as 50% of plant productivity, using the vegetation index as a proxy, and rainfall anomaly explained 80% of the vegetation...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Paraíba; Rainfall anomaly; Ecosystem productivity; Semiarid; Vegetation index.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502121
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Litterfall dynamics in a iron-rich rock outcrop complex in the southeastern portion of the Iron Quadrangle of Brazil Acta Botanica
Valim,Eduardo André Ribeiro; Nalini Jr,Hermínio Arias; Kozovits,Alessandra Rodrigues.
Ecosystems on cangas (duricrust) present considerable heterogeneity of habitats due to microtopographic variations, soil accumulation and a variety of plant functional groups. Therefore, spatial and temporal ecosystem processes such as litterfall are to be expected to be large, and the absence of a level of productivity represents all the facets of iron-rich landscapes. We investigated litterfall in a iron-rich rock complex in the Iron Quadrangle of Brazil, with habitats formed on different evolutionary stages of the soil, resulting in a gradient of biomass, canopy cover and community structure. The measurements were made in open field areas, dominated by herb-shrub vegetation and interspersed with islands of dense vegetation in which there were individual...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Canga; Iron duricrust; Ferruginous fields; Litter production; Ecosystem productivity.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000200005
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Oligotrophy as a major driver of mercury bioaccumulation in medium-to high-trophic level consumers: A marine ecosystem-comparative study ArchiMer
Chouvelon, Tiphaine; Cresson, Pierre; Bouchoucha, Marc; Brach-papa, Christophe; Bustamante, Paco; Crochet, Sylvette; Marco-miralles, Francoise; Thomas, Bastien; Knoery, Joel.
Mercury (Hg) is a global contaminant of environmental concern. Numerous factors influencing its bioaccumulation in marine organisms have already been described at both individual and species levels (e.g., size or age, habitat, trophic level). However, few studies have compared the trophic characteristics of ecosystems to explain underlying mechanisms of differences in Hg bioaccumulation and biomagnification among food webs and systems. The present study aimed at investigating the potential primary role of the trophic status of systems on Hg bioaccumulation and biomagnification in temperate marine food webs, as shown by their medium-to high-trophic level consumers. It used data from samples collected at the shelf-edge (i.e. offshore organisms) in two...
Tipo: Text Palavras-chave: Biomagnifying metal; Bioaccumulation; Trophic status; Ecosystem productivity; Temperate systems.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00410/52111/52936.pdf
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