ORCID Profile
0000-0003-1994-2105
Current Organisation
Universidade Vila Velha
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Publisher: Springer Science and Business Media LLC
Date: 20-02-2019
Publisher: Wiley
Date: 23-05-2012
Publisher: Elsevier BV
Date: 06-2021
Publisher: University of Chicago Press
Date: 06-2015
DOI: 10.1086/681093
Publisher: Wiley
Date: 08-02-2011
DOI: 10.1111/J.1461-0248.2010.01578.X
Abstract: The decomposition of plant litter is one of the most important ecosystem processes in the biosphere and is particularly sensitive to climate warming. Aquatic ecosystems are well suited to studying warming effects on decomposition because the otherwise confounding influence of moisture is constant. By using a latitudinal temperature gradient in an unprecedented global experiment in streams, we found that climate warming will likely hasten microbial litter decomposition and produce an equivalent decline in detritivore-mediated decomposition rates. As a result, overall decomposition rates should remain unchanged. Nevertheless, the process would be profoundly altered, because the shift in importance from detritivores to microbes in warm climates would likely increase CO(2) production and decrease the generation and sequestration of recalcitrant organic particles. In view of recent estimates showing that inland waters are a significant component of the global carbon cycle, this implies consequences for global biogeochemistry and a possible positive climate feedback.
Publisher: Springer Science and Business Media LLC
Date: 28-04-2015
DOI: 10.1007/S10823-015-9263-Z
Abstract: Exercise programmes are effective in reducing falls but few older people consider doing an exercise programme for falls prevention. This paper examines older people's perceptions and experiences of falls, physiotherapy and exercise. In idual interviews were conducted with Australian-born and Italian-born older persons who had ≥1 fall in the past 12 months and completed a community-based physiotherapy programme. Although preventing further falls was considered important, participants were unsure whether falls were preventable. Few described evidence-based approaches such as exercise or medication reviews as strategies to prevent falls. Most participants thought that physiotherapy and exercise were beneficial in improving physical function. A clear explanation on the role of exercise for falls prevention, that many falls are preventable, and understanding of personal motivating and de-motivating factors for exercise for falls prevention are important for clinicians to consider in engaging this group of older people.
Publisher: Wiley
Date: 09-2011
DOI: 10.1890/10-2244.1
Abstract: Most hypotheses explaining the general gradient of higher ersity toward the equator are implicit or explicit about greater species packing in the tropics. However, global patterns of ersity within guilds, including trophic guilds (i.e., groups of organisms that use similar food resources), are poorly known. We explored global ersity patterns of a key trophic guild in stream ecosystems, the detritivore shredders. This was motivated by the fundamental ecological role of shredders as decomposers of leaf litter and by some records pointing to low shredder ersity and abundance in the tropics, which contrasts with ersity patterns of most major taxa for which broad-scale latitudinal patterns haven been examined. Given this evidence, we hypothesized that shredders are more abundant and erse in temperate than in tropical streams, and that this pattern is related to the higher temperatures and lower availability of high-quality leaf litter in the tropics. Our comprehensive global survey (129 stream sites from 14 regions on six continents) corroborated the expected latitudinal pattern and showed that shredder distribution (abundance, ersity and assemblage composition) was explained by a combination of factors, including water temperature (some taxa were restricted to cool waters) and biogeography (some taxa were more erse in particular biogeographic realms). In contrast to our hypothesis, shredder ersity was unrelated to leaf toughness, but it was inversely related to litter ersity. Our findings markedly contrast with global trends of ersity for most taxa, and with the general rule of higher consumer ersity at higher levels of resource ersity. Moreover, they highlight the emerging role of temperature in understanding global patterns of ersity, which is of great relevance in the face of projected global warming.
Publisher: PAGEPress Publications
Date: 16-12-2016
DOI: 10.4081/JLIMNOL.2016.1526
Abstract: The presence of canopy cover may influence the amount of organic detritus and stored water in bromeliad tanks and, consequently, the colonization of these ecosystems by aquatic invertebrates. The aim of this study was to determine the effects of canopy cover on the colonization of the tank-bromeliad em Aechmea lingulata /em in the restinga, an ecosystem composed of a variety of plant communities in the sandy coastal plains of Brazil. We hypothesized that the taxonomic composition of invertebrate communities would differ between bromeliads covered and not covered by a dense canopy (shaded and unshaded bromeliads). Prior to the beginning of the experiment, bromeliads of similar size were carefully washed to remove all organisms and organic detritus, and their tanks were filled with 1.0 L of spring water. On days 7, 14, 21, 30, 45, 60 and 90, four bromeliad tanks of each shade treatment were s led to determine invertebrate communities, stored water and organic detritus. Average daily values of water temperature and light intensity were higher in unshaded than in shaded bromeliads. The amount of fine particulate organic matter (FPOM) and stored water did not differ between treatments, but the amount of coarse particulate organic matter (CPOM) was higher in shaded bromeliads. Ostracoda, Hydracarina and Oligochaeta were the most abundant taxa in bromeliad tanks. Among insects, Culicidae, Chironomidae and Ceratopogonidae were the most representative. Invertebrate colonization occurred quickly and values of abundance were higher in unshaded bromeliads compared to shaded bromeliads. The values for biomass and richness did not differ between treatments or colonization times, and the taxonomic composition of invertebrate communities was similar throughout the experiment. Our results showed that canopy cover had a small influence on the colonization of tanks of em A. lingulata /em in restinga, not corroborating the proposed hypothesis. These findings were likely due to the lack of variation in environmental conditions that are relevant to the colonization process, such as stored water and FPOM. However, because the amounts of CPOM were higher in shaded bromeliads, the taxonomic composition of invertebrate communities could have differed if typical shredders were present.
Publisher: Public Library of Science (PLoS)
Date: 02-01-2018
Publisher: The Royal Society
Date: 27-04-2016
Abstract: Plant litter breakdown is a key ecological process in terrestrial and freshwater ecosystems. Streams and rivers, in particular, contribute substantially to global carbon fluxes. However, there is little information available on the relative roles of different drivers of plant litter breakdown in fresh waters, particularly at large scales. We present a global-scale study of litter breakdown in streams to compare the roles of biotic, climatic and other environmental factors on breakdown rates. We conducted an experiment in 24 streams encompassing latitudes from 47.8° N to 42.8° S, using litter mixtures of local species differing in quality and phylogenetic ersity (PD), and alder ( Alnus glutinosa ) to control for variation in litter traits. Our models revealed that breakdown of alder was driven by climate, with some influence of pH, whereas variation in breakdown of litter mixtures was explained mainly by litter quality and PD. Effects of litter quality and PD and stream pH were more positive at higher temperatures, indicating that different mechanisms may operate at different latitudes. These results reflect global variability caused by multiple factors, but unexplained variance points to the need for expanded global-scale comparisons.
Publisher: Wiley
Date: 14-05-2015
DOI: 10.1111/ECOG.00982
No related grants have been discovered for Marcelo Moretti.