On the integrated interpretation of indirect site ordinations: a case study using semi-arid vegetation in southeastern Spain

Dargie, T. C. D.

doi:10.1007/bf00039980

Cited by 122 publications

(88 citation statements)

References 64 publications

(57 reference statements)

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“…Vegetation ecologists are well aware of spatial statistic methodology [76], which is used to produce isolines representing external correlation structures by means of classification approaches [77] or trend-surface analyses [78]. To our knowledge, this is the first time that multi-species probability estimation, on the basis of habitat/pressure functions, has been examined.…”

Section: Species Compositionmentioning

confidence: 99%

Gradient-Based Assessment of Habitat Quality for Spectral Ecosystem Monitoring

Neumann

Weiss²,

Schmidtlein

et al. 2015

Remote Sensing

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Abstract:The monitoring of ecosystems alterations has become a crucial task in order to develop valuable habitats for rare and threatened species. The information extracted from hyperspectral remote sensing data enables the generation of highly spatially resolved analyses of such species' habitats. In our study we combine information from a species ordination with hyperspectral reflectance signatures to predict occurrence probabilities for Natura 2000 habitat types and their conservation status. We examine how accurate habitat types and habitat threat, expressed by pressure indicators, can be described in an ordination space using spatial correlation functions from the geostatistic approach. We modeled habitat quality assessment parameters using floristic gradients derived by non-metric multidimensional scaling on the basis of 58 field plots. In the resulting ordination space, the variance structure of habitat types and pressure indicators could be explained by 69% up to 95% with fitted variogram models with a correlation to terrestrial mapping of >0.8. OPEN ACCESSRemote Sens. 2015, 7 2872Models could be used to predict habitat type probability, habitat transition, and pressure indicators continuously over the whole ordination space. Finally, partial least squares regression (PLSR) was used to relate spectral information from AISA DUAL imagery to floristic pattern and related habitat quality. In general, spectral transferability is supported by strong correlation to ordination axes scores (R 2 = 0.79-0.85), whereas second axis of dry heaths (R 2 = 0.13) and first axis for pioneer grasslands (R 2 = 0.49) are more difficult to describe.

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Section: Species Compositionmentioning

confidence: 99%

Gradient-Based Assessment of Habitat Quality for Spectral Ecosystem Monitoring

Neumann

Weiss²,

Schmidtlein

et al. 2015

Remote Sensing

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“…Duas técnicas multivariadas foram utilizadas para analisar os dados compilados, objetivando uma investigação integrada para a detecção e interpretação dos padrões florísticos entre as 82 áreas que pudessem ser associados a variáveis geográfico-ambientais (Dargie 1984). A primeira técnica empregada foi uma ordenação por meio da análise de correspondência retificada (DCA -detrended correspondence analysis), que não necessita de suposição sobre distribuição de unidades de amostragem e de espécies no espaço ambiental estudado (McCune & Grace 2002).…”

Section: Methodsunclassified

Composição florística do componente arbóreo e afinidade fitogeográfica de uma floresta semidecídua em Nova Lima, MG

Werneck

Rezende²,

Brina³

et al. 2010

Rev. bras. Bot.

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-(Floristic composition of tree species and phytogeographic affinity of a semideciduous forest in Nova Lima, Minas Gerais State, Brazil). The Nova Lima city (metropolitan area of Belo Horizonte, Minas Gerais State, Brazil) is located in an ecotone between Cerrado (Brazilian Savanna) and Atlantic Forest, wich are two of the world's biodiversity hotspots. A floristic survey was carried out in a semideciduous forest (20°00' S and 43°55' W) in order to establish its relations with other forests (rain forest and semideciduous) from both hotspots, as well as to assess their phytogeographical insertion. The region is under high pressure due to urban expansion. The floristic survey of the semideciduous forest was based on specimens of woody plants collected both in and outside of 44 plots of 20 × 5 meters. The studied forest was compared with other 72 forests of Minas Gerais, São Paulo, Espírito Santo, Rio de Janeiro and Goiás States and the Federal District using multivariate analyses. At semideciduous forest 205 species of 49 botanical families were found. The record of species with restricted distribution to Atlantic Forest was 15 times greater than in the Cerrado. The tree flora of the semideciduous forest studied is a subset of that of rainforests, with species that are more efficient in coping with a longer dry season. Thus, the forest may be considered an Atlantic Forest.Key words -atlantic forest, cerrado, floristic, phytogeography, semideciduous forests RESUMO -(Composição florística do componente arbóreo e afinidade fitogeográfica de uma floresta semidecídua em Nova Lima, MG). O Município de Nova Lima, na Região Metropolitana de Belo Horizonte (MG), encontra-se no contato entre os domínios do Cerrado e da Mata Atlântica, que são dois hotspots de biodiversidade. Uma amostragem florística foi realizada em uma floresta semidecídua (20°00' S e 43°55' W) com o objetivo de avaliar sua relação com outras florestas semidecíduas e ombrófilas presentes em ambos os domínios a avaliar sua afinidade fitogeográfica. A região estudada encontra-se sob alta pressão antrópica devido à expansão urbana. A amostragem florística foi baseada na coleta de todos os indivíduos lenhosos presentes fora e dentro de 44 parcelas retangulares de 20 × 5 metros. A floresta estudada foi comparada com outras presentes no Distrito Federal e dos Estados de Minas Gerais, São Paulo, Espírito Santo, Rio de Janeiro e Goiás usando análises multivariadas. Foram encontradas 205 espécies representando 49 famílias botânicas. O registro de espécies com distribuição restritas a Mata Atlântica foi 15 vezes maior que do Cerrado. A flora arbórea da floresta estudada é, em boa medida, um subconjunto da flora das florestas ombrófilas, tendo espécies provavelmente mais eficientes em resistir e competir sob condições de seca mais prolongada. Assim, a floresta semidecídua estudada pode ser considerada como floresta atlântica sensu lato.

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“…The minimal stress solution was selected and each pair of axes displayed as a two-dimensional scatterplot. Vector analysis (Dargie 1984;Kantivalis and Minchin 1989;Minchin 1994b) was used to determine the direction of vectors across the ordination for five site variables: fire age (time since fire), species richness, mean annual rainfall, latitude and longitude. Each vector represented the maximum correlation between site variables and the spread of the quadrats within the ordination space.…”

Section: Methodsmentioning

confidence: 99%

Habitat characteristics for New Holland mouse Pseudomys novaehollandiae in Victoria

Wilson¹,

Laidlaw²

2003

Aust. Mammalogy

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Pseudomys novaehollandiae is 'Endangered' in Victoria, where it is presently considered to be extant at only three localities Loch Sport, Providence Ponds, and Wilsons Promontory. This study aimed to determine indicators of suitable habitat for the species that could assist in identifying potential habitat and sites for planned re-introductions as part of a recovery program. Vegetation and site data (soils, topography, rainfall, fire age-time since fire) were assessed at localities where P. novaehollandiae was recorded. The species occurred in five structural vegetation groups -open-forest, woodland, heathland, shrubland, grassland, with the most common being open-forest and woodland. Grassland and shrubland were restricted to coastal sand-dunes in south Gippsland. Understorey vegetation at most sites was dominated by sclerophyllous shrubs ranging in cover from 10 -70%. Classification of quadrats produced eight floristic groups in which the trend was for quadrats to cluster according to geographical location. Ordination confirmed the classification pattern and vector-fitting produced significant correlations between vector points and five variables: species richness, latitude, longitude, fire age and annual rainfall. The study identified a range of vegetation communities where P. novaehollandiae occurs and provided evidence that the species is not restricted to floristically rich and diverse heathlands. The findings can be used to determine further localities with suitable habitat. However, factors other than vegetation are also likely to be important in predicting suitable habitat.Key words: Pseudomys novaehollandiae, New Holland mouse, habitat, Victoria, vegetation structure. (Keith and Calaby 1968; Mahoney and Marlow 1968;Seebeck and Beste 1970;Posamentier and Recher 1974;Hocking 1980). Recently, however, it has also been found at sites up to 100 km inland at altitudes of 550 -900 m in Queensland and NSW (Read 1988; Townley 1993;Van Dyck and Lawrie 1997). P. novaehollandiae occurs in a variety of habitats including heathland and woodland (Posamentier and Recher 1974;Kemper 1977;Braithwaite and Gullan 1978;Hocking 1980;Pye 1991), dry sclerophyll forest with a dense shrub layer (Keith and Calaby 1968;Seebeck and Beste 1970;Fox and McKay 1981) and on vegetated sand dunes (Keith and Calaby 1968;Fox and Fox 1978;Cockburn 1980;Pye 1991). B.A. Wilson, School of Ecology and EnvironmentalThe microhabitat preferences of P. novaehollandiae have been found to be influenced by vegetation floristics and structure, and soil characteristics. Studies undertaken in NSW in coastal heath and open-forest regenerating after sand-mining found that the biomass of the species was highly correlated with the proportion of heath species, vegetation cover below 50 cm and softer substrates Fox 1978, 1984). At Cranbourne in Victoria, Braithwaite and Gullan (1978) found that floristic variables explained more of the habitat preferences of P. novaehollandiae than structural variables. In the eastern Otways, Victoria, the species preferred...

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On the integrated interpretation of indirect site ordinations: a case study using semi-arid vegetation in southeastern Spain

Cited by 122 publications

References 64 publications

Gradient-Based Assessment of Habitat Quality for Spectral Ecosystem Monitoring

Gradient-Based Assessment of Habitat Quality for Spectral Ecosystem Monitoring

Composição florística do componente arbóreo e afinidade fitogeográfica de uma floresta semidecídua em Nova Lima, MG

Habitat characteristics for New Holland mouse Pseudomys novaehollandiae in Victoria

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