A review on habitats, plant traits and vegetation of ephemeral wetlands - a global perspective

Deil, Ulrich

doi:10.1127/0340-269x/2005/0035-0533

Cited by 211 publications

(201 citation statements)

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“…high unimodality for temperature in all communities). In our case, erratic patterns for the association Eleocharito-Caricetum in the variables soil reaction (R) and soil nitrogen content (N) as well as a bimodal trend for soil humidity (F) can be related to the dynamic of this ephemeral vegetation (Deil 2005) and the strong introgression of species belonging to the neighbouring plants communities, which occur under different environmental conditions. Such plant communities affecting the species composition of Eleocharito-Charicetea may belong to the pioneer vegetation of mesotrophic, periodically flooded fringes of water bodies (class Bidentetea tripartiti) or neighbouring ephemeral vegetation belonging to the class Isoëto-Littorelletea (Pott 1995, Rodwell et al 2002.…”

Section: Observed Values and Shape Of Mean Indicator Spectramentioning

confidence: 60%

Tendency and distribution indices for ordinal variables applied to Ellenberg indicator values

2013

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The use of mean value for the analysis of Ellenberg indicator values in plots or plant community types has been criticised by several authors. On the other hand, little attention has been paid to distribution patterns of the respective classes frequencies. Herewith we make a revision of metrics available for the characterization of tendency and distribution patterns of ordinal variables, like in the case of Ellenberg indicator values, and discuss their relation to frequency histogram shapes. We selected three tendencies (mean value, median value and mode) and two distribution metrics (position index and relative dominance). Additionally, we proposed a concentration index, which is analogous to the contagion index commonly used by landscape ecologists. According to our observations, we recommend the use of the median value and the concentration index to quantify respectively the tendency and distribution patterns on indicator spectra (frequency histograms) according to the Ellenberg indicator values. Further studies are required to get better ecological interpretations in the distribution patterns of indicator spectra. KEYWORDS:Bio-indicators, ecol ogical monitoring, grassland vegetation, species composition. RESUMENEl uso del valor promedio en el análisis de valores indicadores de Ellenberg en censos o comunidades vegetales ha sido criticado por varios autores. Por otro lado, se ha prestado poca atención a los patrones de distribución de las clases de frecuencia. En este trabajo se hace una revisión sobre métricas disponibles para cuantificar tendencia y distribución en escalas ordinales, como es el caso de los indicadores ecológicos de Ellenberg y discutir su relación con las formas de los histogramas de frecuencia respectivos. Para ello se eligieron tres métricas de tendencia (valor promedio, mediana y moda) y dos métricas de distribución (índice de posición y dominancia relativa). Además se propone el índice de concentración que es análogo al índice de contagio usado en ecología de paisaje. En este trabajo se recomienda el uso de la mediana y el índice de concentración para cuantificar respectivamente la tendencia y la distribución en espectros de indicadores (histogramas de frecuencia) calculados en base a los valores de Ellenberg. Se requieren estudios adicionales para lograr una mejor interpretación ecológica de los patrones de distribución mencionados en este trabajo.

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Section: Observed Values and Shape Of Mean Indicator Spectramentioning

confidence: 60%

Tendency and distribution indices for ordinal variables applied to Ellenberg indicator values

2013

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“…Th e members of the genus Elatine are inconspicuous, but characteristic annual species of damp, pioneer surfaces or shallow, temporarily inundated habitats (Deil 2005, Lukács et al 2013. Elatine species belong to the most characteristic representatives of the fl ora of Mediterranean temporary ponds (Ba gel la et al 2009, Bagella and Caria 2012, Minissale and Sciandrello 2015, which are one of the most valuable and endangered habitat types in the Mediterranean (Zacharias et al 2007, Zacharias and Zamparas 2010, Rhazi et al 2012.…”

Section: Introductionmentioning

confidence: 99%

New localities of Elatine macropoda and E. alsinastrum in Turkey (Çanakkale)

Löki¹,

2015

Studia bot. hung.

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New chorological data are presented for the rare and poorly known ephemeral wetland specialists Elatine macropoda and E. alsinastrum from Çanakkale Province (western Turkey). Th e former species was hitherto known only from a single Turkish locality in İzmir Province, and the latter was reported only from Edirne, Denizli and Kars Provinces. Th e habitats preferred by both species are temporary ponds, especially their grazed and trampled muddy shores. Th e existence of further populations in such habitats is highly presumable.

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“…Yet being highly endangered by agricultural intensification, some well preserved temporary ponds still persist. On a global scale, the distribution of Mediterranean temporary ponds is well known, as it mirrors the Mediterranean climate zones (Barbour et al, 2005;Deil, 2005;Médail et al, 1998). Nevertheless, within their area of distribution, other types of temporary ponds coexist, and very little is known about the relative importance of environmental factors in determining their spatial variation.…”

Section: Introductionmentioning

confidence: 99%

Biotic and abiotic parameters that distinguish types of temporary ponds in a Portuguese Mediterranean ecosystem

Pinto-Cruz

Barbosa

Molina

et al. 2011

Ecological Indicators

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a b s t r a c tTemporary ponds are seasonal wetland habitats subjected to extreme and unstable ecological conditions. Some are classified as priority habitats for conservation by the European Union Habitats Directive. Our study area was the coastal plain of southwest Portugal, which spans across 100 km north to south and hosts a large number of temporary ponds as a consequence of climatic and edaphic characteristics. Field sampling of floristic and edaphic data was carried out in 24 temporary ponds every spring between 2005 and 2008. We recorded a total of 174 plant species identified within visually homogeneous plots. We included the data in a geographic information system and classified ponds according to their floristic composition, using a biotic regionalization analysis based on species presence/absence, which is a practical and unambiguous criterion. We found three significantly different groups of ponds which corresponded to an eco-physiognomic pond typology: Mediterranean temporary ponds, marshlands, and disturbed ponds. For the first two pond types we defined characteristic or indicator plant species. We searched also for relationships between pond type and a series of large-scale climatic, geographic, and geological variables, as well as local-scale physical and chemical properties of the soil. Pond type was distinguished by a complex combination of some of these variables, including environmental energy, soil texture, nitrogen content of the soil and pH. A practical way of discriminating between different types of ponds is important so that management and conservation measures can be defined accordingly.

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A review on habitats, plant traits and vegetation of ephemeral wetlands - a global perspective

Cited by 211 publications

References 0 publications

Tendency and distribution indices for ordinal variables applied to Ellenberg indicator values

Tendency and distribution indices for ordinal variables applied to Ellenberg indicator values

New localities of Elatine macropoda and E. alsinastrum in Turkey (Çanakkale)

Biotic and abiotic parameters that distinguish types of temporary ponds in a Portuguese Mediterranean ecosystem

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