Numerical Ecology with R

Borcard, Daniel; Gillet, François; Legendre, Pierre

doi:10.1007/978-1-4419-7976-6

Cited by 2,196 publications

(1,522 citation statements)

References 0 publications

Supporting

Mentioning

1,397

Contrasting

Unclassified

Order By: Relevance

“…Two multiple regression models were used to predict total above-ground C (univariate (Borcard et al, 2011) were also included in this RDA model. Prior to analysis, the numeric explanatory variables were normalized and standardized while the response variables were normalized.…”

confidence: 99%

“…Prior to analysis, the numeric explanatory variables were normalized and standardized while the response variables were normalized. Global forward selection was used to obtain a parsimonious RDA model and verify for inflated variance (VIF), in order to minimize the correlation among variables (Borcard et al, 2011). This procedure resulted in a simplified model consisting of the land-use types (categorical), the richness, the identity of the dominant (categorical) and one spatial variable (medium scale).…”

confidence: 99%

“…Each explanatory dataset was forward selected separately in order to assess the magnitude of the various fractions, including the combined ones (Borcard et al, 2011). The explanatory datasets included three biodiversity indices, identity of the dominant, land-use, and five spatial variables (db MEM).…”

confidence: 99%

See 2 more Smart Citations

Traditional shifting agriculture: tracking forest carbon stock and biodiversity through time in western Panama

Pelletier

Codjia

Potvin

2012

Global Change Biology

View full text Add to dashboard Cite

Reducing Emissions from Deforestation and forest Degradation (REDD+) requires developing countries to quantify green-house gas emissions and removals from forests in a manner that is robust, transparent, and as accurate as possible. While shifting cultivation is a dominant practice in several developing countries, there is still very limited information available on how to monitor this land-use practice for REDD+ as little is known about the areas of shifting cultivation or the net carbon balance. In the present work, we propose and test a methodology to monitor the effect of the shifting cultivation on above-ground carbon stocks. We combine multi-year remote sensing information, taken from a 12-year period, with an in-depth community forest carbon stock inventory in Palo Seco Forest Reserve, western Panama. With remote sensing, we were able to separate four forest classes expressing different forest-use intensity and timesince-intervention which demonstrate expected trends in above-ground carbon stocks. The addition of different interventions observed over time is shown to be a good predictor, with remote sensing variables explaining 64.2% of the variation in forest carbon stocks in cultivated landscapes. Multi-temporal and multi-spectral medium resolution satellite imagery is shown to be adequate for tracking land-use dynamics of the agriculture-fallow cycle. The results also indicate that, over time, shifting cultivation has a transitory effect on forest carbon stocks in the study area. This is due to the rapid recovery of forest carbon stocks, which results in limited net emissions. Finally, community participation yielded important additional benefits to measuring

show abstract

confidence: 99%

See 1 more Smart Citation

Traditional shifting agriculture: tracking forest carbon stock and biodiversity through time in western Panama

Pelletier

Codjia

Potvin

2012

Global Change Biology

View full text Add to dashboard Cite

show abstract

“…In order to quantify the fractions of fungal community variance explained by all measured environmental variables, the partition of variation was performed. Significant variables were forward‐selected from three subsets (spatial variables, soil variables, and plant types) in order to avoid explanatory variable collinearity in the model and to search for parsimony, following the methods in Borcard, Gillet, and Legendre (2011). Subsequently, the fractions of fungal community variance independently explained by the forward‐selected environmental variables were computed and tested for significance.…”

Section: Methodsmentioning

confidence: 99%

The last 50 years of climate‐induced melting of the Maliy Aktru glacier (Altai Mountains, Russia) revealed in a primary ecological succession

Gatti

Dudko

Lim

et al. 2018

Ecology and Evolution

View full text Add to dashboard Cite

In this article, we report and discuss the results obtained from a survey of plants, microorganisms (bacteria and fungi), and soil elements along a chronosequence in the first 600 m of the Maliy Aktru glacier's forefront (Altai Mountains, Russia). Many glaciers of the world show effects of climate change. Nonetheless, except for some local reports, the ecological effects of deglaciation have been poorly studied and have not been quantitatively assessed in the Altai Mountains. Here, we studied the ecological changes of plants, fungi, bacteria, and soil elements that take the form of a primary ecological succession and that took place over the deglaciated soil of the Maliy Aktru glacier during the last 50 year. According to our measurements, the glacier lost about 12 m per year during the last 50 years. Plant succession shows clear signs of changes along the incremental distance from the glacier forefront. The analysis of the plant α‐ and β‐diversity confirmed an expected increase of them with increasing distance from the glacier forefront. Moreover, the analysis of β‐diversity confirmed the hypothesis of the presence of three main stages of the plant succession: (a) initial (pioneer species) from 30 to 100 m; (b) intermediate (r‐selected species) from 110 to 120–150 m; and (c) final (K‐selected species) from 150 to 550. Our study also shows that saprotrophic communities of fungi are widely distributed in the glacier retreating area with higher relative abundances of saprotroph ascomycetes at early successional stages. The evolution of a primary succession is also evident for bacteria, soil elements, and CO 2 emission and respiration. The development of biological communities and the variation in geochemical parameters represent an irrefutable proof that climate change is altering soils that have been long covered by ice.

show abstract

“…A relação entre os atributos foliares e a radiação luminosa incidente foi verificada por meio do teste de Correlação de Pearson. Todas as análises estatísticas foram realizadas em software R Studio com interface ao pacote R commander (Borcard et al 2011).…”

Section: Methodsunclassified

Adaptações estruturais de sete espécies ciófitas arbustivas de Floresta Ombrófila Densa

Júnior

Silva

Amorim

et al. 2017

Hoehnea

View full text Add to dashboard Cite

-(Structural adaptations of seven shade shrubs in species of Tropical Rain Forest). Understory species are adapted to shade condition imposed by the canopy. This study characterized, by means of leaf attributes, the strategies used by different species of understory. The study was conducted at the Botanical Garden of the University of the Region of Joinville, Santa Catarina State, Brazil. Seven shade species were selected. Of each species, five individuals were selected and 25 leaves were collected for morphological and anatomical analysis and chlorophyll content. The incident light intensity on each specimen was measured. The results confirmed the high degree of shading in understory plants. The ratio chlorophyll a/b was >1 and therefore contrary to expected. Statistical tests showed the existence of patterns of response to shading, morphologically characterized by fresh weight, leaf area, length and width of the blade and leaf specific area and, anatomically, the thickness of the spongy parenchyma. The convergence of these attributes is associated with greater use of light that reaches the understory. Keywords: leaf traits, light, rain forest, understory RESUMO -(Adaptações estruturais de sete espécies ciófitas arbustivas de Floresta Ombrófila Densa). As espécies do subosque são adaptadas à condição de sombreamento imposta pelo dossel. O presente estudo caracterizou, por meio de atributos foliares, as estratégias utilizadas por diferentes espécies de subosque. O estudo foi realizado no Jardim Botânico da Universidade da Região de Joinville, SC, Brasil. Foram selecionadas sete espécies ciófitas. De cada espécie foram selecionados cinco indivíduos, dos quais 25 folhas foram coletadas para análise morfoanatômica e de teor de clorofila. A intensidade luminosa incidente sobre cada espécime foi medida. Os resultados confirmaram o alto grau de sombreamento das plantas em subosque. A razão clorofila a/b foi >1 e, portanto, contrária a esperada. Os testes estatísticos evidenciaram a existência de padrões de resposta ao sombreamento, caracterizados morfologicamente pela massa fresca, área foliar, comprimento e largura do limbo e área específica foliar e, anatomicamente, pela espessura do parênquima lacunoso. A convergência destes atributos está relacionada ao maior aproveitamento da luz que atinge o subosques.

show abstract

Numerical Ecology with R

Cited by 2,196 publications

References 0 publications

Traditional shifting agriculture: tracking forest carbon stock and biodiversity through time in western Panama

Traditional shifting agriculture: tracking forest carbon stock and biodiversity through time in western Panama

The last 50 years of climate‐induced melting of the Maliy Aktru glacier (Altai Mountains, Russia) revealed in a primary ecological succession

Adaptações estruturais de sete espécies ciófitas arbustivas de Floresta Ombrófila Densa

Contact Info

Product

Resources

About