Niche analysis and conservation of the orchids of east Macedonia (NE Greece)

Tsiftsis, Spyros; Tsiripidis, Ioannis; Karagiannakidou, V.; Alifragis, D.

doi:10.1016/j.actao.2007.08.001

Cited by 62 publications

(104 citation statements)

References 22 publications

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“…geological substrate was found as the most important factor that determined the conservation value. This is in accordance with the results of previous studies (dijk et al 1997;Tsiftsis et al 2008), which indicated the significance of soil properties in determining orchid distribution. in fact, geological substrate is a surrogate of soil properties.…”

Section: Discussionsupporting

confidence: 83%

“…Surprisingly, vegetation type was not included in the regression tree model, although it is known to be closely related with the distribution of orchids (Tsiftsis et al 2008;Landi et al 2009). This can be attributed to the resolution of the vegetation data (grid cells of 1 km 2 ), which despite being adequate for conservation planning, it seems that it cannot ascribe the small scale differentiation of vegetation.…”

Section: Discussionmentioning

confidence: 99%

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Identifying important areas for orchid conservation in Crete

Tsiftsis¹,

Tsiripidis²,

Trigas³

2012

European Journal of Environmental Sciences

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Crete is especially rich in orchids and their distribution is well known and documented by many floristic accounts. This information, however, is yet to be used to set conservation plans and priorities. We used MaxEnt incorporating both published and unpublished distribution data together with environmental variables to predict the potential distribution of orchids on Crete. The resulting probabilistic maps of species occurrence were used to identify the important areas for orchid conservation on the island. Sites prioritization was performed by applying a species weighting scheme, which was based on species niche breadth. The existence of ecological patterns determining site prioritization was determined using a regression tree analysis based on environmental variables and scores derived from Zonation analysis. The high importance sites were found on Mts Thripti, Ida and Lefka Ori, as well as at low altitude areas east of Heraklion and at the easternmost part of the island. Most of the variation in the site scores was explained by geological substrate, latitude and altitude. Based on the regression tree analysis, sites with the highest scores were at medium and high altitude areas, which are located at the interior of the island. These areas have soils mainly derived from limestones, ophiolites and deposits of calcareous rocks. The lack of a significant effect of vegetation type in explaining the distribution of high importance areas highlights the need for the establishment of micro-reserves for the conservation of orchids in Crete. Finally, endangered orchid species in need of specific conservation actions are indicated.

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Section: Discussionsupporting

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Identifying important areas for orchid conservation in Crete

Tsiftsis¹,

Tsiripidis²,

Trigas³

2012

European Journal of Environmental Sciences

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“…If the values of species tolerance are lower, the species is considered a specialist. In contrast, generalists are assumed to live in a habitat with widely varying environmental conditions and thus they show higher values of species tolerance (Dolédec et al 2000, Heino & Soininen 2006, Tsiftsis et al 2008.…”

Section: Methodsmentioning

confidence: 99%

Influence of nutrients, temperature, light and salinity on the occurrence of Paralia sulcata at Helgoland Roads, North Sea

Gebühr¹,

Wiltshire²,

Aberle³

et al. 2009

Aquat. Biol.

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Paralia sulcata is a tychopelagic centric diatom species common in the North Sea. Due to the fact that P. sulcata is found both in the sediment and the water column, it is assumed to be an important food source for both benthic and pelagic grazers. We know a little about the environmental conditions associated with the occurrence of P. sulcata, but almost nothing is known of its ecological role. Thus the aim of this study was to investigate the ecology of P. sulcata. The Helgoland Roads long-term data set (North Sea), in which phytoplankton and physicochemical parameters have been sampled since 1962, served as the environmental data set. To detect possible species-environment relationships, multivariate statistical analysis was carried out (canonical correspondence analysis). Annual niche breadth and niche position (outlying mean indices) were calculated for P. sulcata. Up to 1996, P. sulcata occurred mainly in late autumn and winter, but since 1997 it has been found throughout the year. The niche position and niche breadth for P. sulcata varied over the sampling period. There was a change in the ecological niche of P. sulcata, with a shift from a more specialized to a more generalized niche and a new occurrence of this diatom in summer during the last 10 yr. Changing temperature, light and nutrient conditions at Helgoland Roads could be responsible for the new occurrence and the shift in the ecological niche of P. sulcata.

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“…The results are two measures, niche position and niche breadth. The position describes the location of the niche in the hypervolume and the breadth describes the corresponding expansion (Dolédec et al 2000;Heino and Soininen 2006;Tsiftsis et al 2008). With an analyses of only one species (or habitat), it is hardly possible to tell if this is a specialist or a generalist, the classification is therefore done in a comparative way.…”

Section: Methods 2: Outlying Mean Index (Omi)mentioning

confidence: 99%

“…Therefore, niche position describes the location (center) of the realized niche in the n-dimensional hypervolume. Niche breadth describes the tolerance of a species associated with the environmental parameters in the habitat, i.e., the expansion of the niche in the hypervolume (Dolédec et al 2000;Heino and Soininen 2006;Tsiftsis et al 2008).…”

mentioning

confidence: 99%

Reconstructing the realized niche of phytoplankton species from environmental data: fitness versus abundance approach

Grüner¹,

Gebühr²,

Boersma³

et al. 2011

Limnology & Ocean Methods

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The classification of the ecological niche and the grouping of species into generalists and specialists are established ecological concepts. In this study, we compare two methods for the calculation of the realized ecological niche from long-term species data. As the first method, we present a new approach to reconstruct the realized niche not in terms of abundance but via a measure of fitness (optimal niche), which we call the Optimal Niche Estimate (ONE). The second method, the outlying mean index (OMI) analysis, is performed with abundance data for calculating the ecological niche. We demonstrate and discuss differences between methods by applying them to time series of three phytoplankton species from the Helgoland Roads long-term data set: Ceratium fusus, Odontella regia, and Paralia sulcata.

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Niche analysis and conservation of the orchids of east Macedonia (NE Greece)

Cited by 62 publications

References 22 publications

Identifying important areas for orchid conservation in Crete

Identifying important areas for orchid conservation in Crete

Influence of nutrients, temperature, light and salinity on the occurrence of Paralia sulcata at Helgoland Roads, North Sea

Reconstructing the realized niche of phytoplankton species from environmental data: fitness versus abundance approach

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