Application of Multi-Response Permutation Procedures for Examining Seasonal Changes in Monthly Mean Sea-Level Pressure Patterns

Mielke, Paul W.; Berry, Kenneth J.; Brier, Glenn W.

doi:10.1175/1520-0493(1981)109<0120:aomrpp>2.0.co;2

Cited by 146 publications

(70 citation statements)

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“…Therefore, main diatoms assemblages composed by groups of lakes with homogeneous taxonomic compositions were determined with TWINSPAN (Hill, 1979). Classifications obtained were tested with MRPP (Mielke et al, 1981) which allowed to choose the best classification thanks to A and p values. Avalue describes the homogeneity within a group.…”

Section: Discussionmentioning

confidence: 99%

Benthic diatom communities in high altitude lakes: a large scale study in the French Alps

Feret¹,

Bouchez²,

Rimet³

2017

Ann. Limnol. - Int. J. Lim.

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-Altitude lakes are weakly impacted by human activities. This makes them choice ecosystems to understand how biological communities are impacted by natural factors. This question was addressed to littoral benthic diatoms, a largely used ecological indicator. We wanted to know if benthic diatoms in lakes are more impacted by local varying factors (altitude, lake depth...) or regional varying factors (geology). The study area takes place in the Northern French Alps. Littoral benthic diatoms of 63 natural lakes situated between 1350 and 2700 m · a.s.l. were sampled. Two categories of communities were observed: one of deep and lower altitude lakes and one of higher altitude and shallower lakes. In each category, communities were characterized and were corresponding to particular lake types: lakes dominated by a particular geology, lakes with a water level fluctuation, turbid lakes,... Communities did not show a spatial structure. We observed that local factors were more important than regional factors. Indeed, the study area displayed a mixed geology even at a local level. On another hand, altitude a local varying factor determines freezing period a determining item of high-altitude lake functioning.

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Section: Discussionmentioning

confidence: 99%

Benthic diatom communities in high altitude lakes: a large scale study in the French Alps

Feret¹,

Bouchez²,

Rimet³

2017

Ann. Limnol. - Int. J. Lim.

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“…The correlation coefficients were calculated using the method of the first difference series . Finally, the significance of the identified shifts was tested using the non-parametric multi-response permutation procedure [(MRPP); Mielke et al, 1981;Easterling and Peterson, 1994]. This procedure, after an a priori subdivision into two groups, compares the Euclidean distances between members of the same group of data with the distances of all members of both groups; in our analysis, the two groups are data of the standardized series of Q before and after the potential shift (with a window length of 96 values centred at the shift point).…”

Section: ]}) On the Contrary If X T Is Located In An Area Of Decreamentioning

confidence: 99%

Annual and seasonal precipitation over Italy from 1961 to 2006

Toreti

Fioravanti

Perconti

et al. 2009

Intl Journal of Climatology

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Annual and seasonal precipitation series were derived from a set of 59 synoptic meteorological stations homogeneously distributed over Italy, in order to evaluate possible changes in precipitation behaviour and identifying areas of coherent variability. The time series were homogenized and standardized anomaly series were calculated for three areas: north, centre and south of Italy. Rotated principal component analysis (PCA) was applied to monthly data and the related loading maps were generated. The annual series do not show significant trends, while among the seasonal series only those of winter in northern and central Italy are non-stationary; they are characterized, respectively, by a decreasing trend for the entire period and by a positive trend since 1989. Seven common patterns were identified from clustered rotated principal components and linked with synoptical weather regimes.

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“…Thirdly, the probability of each grid point to belong to the reference matrix is calculated by using a simplified version of the Multiple Response Permutation Procedure (Mielke et al 1981). This probability (v) is the number of times the simulated distance was found greater or equal than the observed average distance:…”

Section: Modeling Of the American Jackknife Clam Distributionmentioning

confidence: 99%

Climate-induced range shifts of the American jackknife clam Ensis directus in Europe

et al. 2014

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Mapping the future potential distribution of alien species has become an issue of great concern. Ecological niche models are increasingly used to forecast the spatial range of introduced species in the context of climate warming. Here, we studied the potential spread of the American jackknife clam Ensis directus into European waters. E. directus, a marine bivalve native to the American coasts, was observed in Europe for the first time in the German Bight at the end of the 1970s. Afterwards, the clam quickly colonized the surrounding waters of the North Sea. Although many studies focused on its biology, ecology and colonization, the extent to which E. directus may invade European and Nordic seas remained poorly known. In this study, we used two ecological niche models (ENMs), calibrated on the native area of the mollusk, to evaluate the potential distributional range of the bivalve over European seas. Under current environmental conditions, E. directus should continue to progress towards the southern coasts of France and may also invade new areas in the Adriatic Sea. Projections for the end of the century suggest that the probability of occurrence of E. directus increases from Denmark to France with both ENMs. The Tunisian coasts may also become a new suitable area for the mollusk but the results of the two ENMs differ for this region. Therefore, contrary to what is often observed, a southward range expansion of E. directus is probable, especially as climate will get warmer.

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Application of Multi-Response Permutation Procedures for Examining Seasonal Changes in Monthly Mean Sea-Level Pressure Patterns

Cited by 146 publications

References 0 publications

Benthic diatom communities in high altitude lakes: a large scale study in the French Alps

Benthic diatom communities in high altitude lakes: a large scale study in the French Alps

Annual and seasonal precipitation over Italy from 1961 to 2006

Climate-induced range shifts of the American jackknife clam Ensis directus in Europe

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