Contribution to the study of the flora and vegetation of the Kithira
island group: Offshore islets of Kithira (S Aegean, Greece)

Panitsa, Maria; Bazos, Ioannis; Dimopoulos, Panayotis; Zervou, Sevasti; Yannitsaros, A.; Tzanoudakis, Dimitris

doi:10.3372/wi.34.34109

Cited by 13 publications

(22 citation statements)

References 11 publications

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“…The predominance of therophytes in the Aegean islands reflects the bioclimatological position of the area, with its intense thermo‐Mediterranean character and long summer aridity (Livaniou‐Tiniakou et al. , 2003; Panitsa et al. , 2003, 2004; Tzanoudakis et al.…”

Section: Discussionmentioning

confidence: 99%

“…In this part of the east Aegean area, sea depth does not exceed 100 m. Consequently, the islets were part of a continuous land mass encompassing most of the eastern Aegean islands and Asia Minor during Pleistocene glacial periods (Dermitzakis, 1990). More information regarding the flora, geology and climate of the area studied is given by Panitsa (1997) and Panitsa & Tzanoudakis (1997, 1998, 2001). Names, geographical coordinates, total surface area ( A ), species richness recorded by H. Runemark and R. von Bothmer ( S 74), species richness recorded by us ( S 94), shortest distance from the nearest large inhabited island ( D ), maximum elevation ( E ), application of grazing (GR), presence of breeding gull colonies (GU) and evidence of fire (F) for all islets are given in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…In addition to grazing, therophytes constitute a large percentage of the species present on Mediterranean islands because of their overall adaptations to local conditions and their abilities to colonize new open habitats quickly, so that typically they represent a large number of the invasive plants, particularly in the Mediterranean Basin (Quézel et al, 1990). The predominance of therophytes in the Aegean islands reflects the bioclimatological position of the area, with its intense thermo-Mediterranean character and long summer aridity (Livaniou-Tiniakou et al, 2003;Panitsa et al, 2003Panitsa et al, , 2004Tzanoudakis et al, 2006).…”

Section: Turnover Of Plants On Aegean Isletsmentioning

confidence: 99%

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ORIGINAL ARTICLE: Turnover of plants on small islets of the eastern Aegean Sea within two decades

Panitsa

Tzanoudakis²,

Sfenthourakis

2008

Journal of Biogeography

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Aim To estimate species turnover of plants on 32 small islands within a 20-year period and to assess possible changes in community composition and properties, such as species richness and factors affecting it, nestedness, species co-occurrence and overall community similarity. Additionally, to assess the possible effects of grazing, gull colonies and fire on turnover values.Location Thirty-two islets in the eastern Aegean Sea (Greece).Methods Complete sampling of plants was performed in 1974 and in 1990-94 (mostly in 1994, which was used as the reference year). Species turnover rates were estimated using both per island and per species approaches. Multiple regression was used to evaluate factors affecting species richness. Chi-square tests were applied to compare community composition among sampling periods. The effects of various factors on turnover rates and species richness were examined using one-way anova and ancova. Mann-Whitney tests were applied in order to check for differences between frequencies of occurrence of extinct, immigrant and persisting species. Community nestedness was calculated using bitmatnest and the C-score index for co-occurrence was estimated using EcoSim7. Species similarities among islands in each of the 1974 and 1994 data sets were assessed using Jaccard's index and the two similarity matrices were compared using a Mantel test. ResultsOf 391 species recorded on the islets, 334 were present in 1974, 301 in 1994 and 244 were common to both these periods. Species richness in the 1974 and 1994 data sets was significantly correlated with elevation and area, but not with distance from the nearest large island. Richness was positively affected by grazing, but not by fire or gull colonies. The slopes of species-area and species-elevation regressions were almost identical in 1974 and 1994. Mean relative turnover was 2.06 (species per islet) and 3.26 (islets per species). Turnover was not correlated with area, elevation or distance from the nearest large island. Nestedness and co-occurrence levels were very similar. Tables of islet by islet floral similarity (Jaccard's index) did not differ between the 1974 and 1994 data sets.Main conclusions The turnover rates found are among the highest recorded for plants; at the same time the islet communities exhibit notable stability in overall properties. Our results provide evidence for rapid shifts in species number that may nonetheless be considered as equilibrial dynamics, as these islets are able to respond rapidly to environmental change and disturbance. Human activities, notably the application of grazing, have a significant complicating effect on community dynamics, enhancing observed turnover rates.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Turnover Of Plants On Aegean Isletsmentioning

confidence: 99%

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ORIGINAL ARTICLE: Turnover of plants on small islets of the eastern Aegean Sea within two decades

Panitsa

Tzanoudakis²,

Sfenthourakis

2008

Journal of Biogeography

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“…We used the total flora of 19 Aegean islands (Table 1), ranging from 0.02 to 53 km 2 in surface area, as reported in Panitsa & Tzanoudakis (1998, 2001, 2010), Panitsa et al. (1994, 2004, 2006, 2008, 2010) and Tzanoudakis et al.…”

Section: Methodsmentioning

confidence: 99%

“…We used the total flora of 19 Aegean islands (Table 1), ranging from 0.02 to 53 km 2 in surface area, as reported in Panitsa & Tzanoudakis (1998, 2001, 2010, Panitsa et al (1994Panitsa et al ( , 2004Panitsa et al ( , 2006Panitsa et al ( , 2008 and Tzanoudakis et al (2006), in which geographical, ecological and floristic information about these islands, along with maps showing their location, can be found. Only native taxa have been considered herein.…”

Section: Materials S and Methodsmentioning

confidence: 99%

From plots to islands: species diversity at different scales

Sfenthourakis

Panitsa

2011

Journal of Biogeography

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Aim To investigate how plant diversity of whole islands (‘gamma’) is related to alpha and beta diversity patterns among sampling plots within each island, thus exploring aspects of diversity patterns across scales. Location Nineteen islands of the Aegean Sea, Greece. Methods Plant species were recorded at both the whole‐island scale and in small 100 m2 plots on each island. Mean plot species richness was considered as a measure of alpha diversity, and six indices of the ‘variation’‐type beta diversity were also applied. In addition, we partitioned beta diversity into a ‘nestedness’ and a ‘replacement’ component, using the total species richness recorded in all plots of each island as a measure of ‘gamma’ diversity. We also applied 10 species–area models to predict the total observed richness of each island from accumulated plot species richness. Results Mean alpha diversity was not significantly correlated with the overall island species richness or island area. The range of plot species richness for each island was significantly correlated with both overall species richness and area. Alpha diversity was not correlated with most indices of beta diversity. The majority of beta diversity indices were correlated with whole‐island species richness, and this was also true for the ‘replacement’ component of beta diversity. The rational function model provided the best prediction of observed island species richness, with Monod’s and the exponential models following closely. Inaccuracy of predictions was positively correlated with the number of plots and with most indices of beta diversity. Main conclusions Diversity at the broader scale (whole islands) is shaped mainly by variation among small local samples (beta diversity), while local alpha diversity is not a good predictor of species diversity at broader scales. In this system, all results support the crucial role of habitat diversity in determining the species–area relationship.

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Biogeographical determinants for total and endemic species richness in a continental archipelago

et al. 2009

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We examined the relationship between plant species richness and biogeographical variables (island area, island maximum elevation, distance from nearest inhabited island, distance from nearest mainland) using a data set comprising 201 islands of the Aegean archipelago. We found that endemic species richness was strongly correlated to total species richness. Single-island endemic species richness was most strongly correlated to island maximum elevation, and then to island area, with an apparent small island effect for islands smaller than 47 km 2 . Total species richness was most strongly correlated to island area (with no apparent small island effect), and less strongly correlated to island maximum elevation. Distance from the mainland or other inhabited islands displayed limited predictive value in our data set. The slope of the relationship between species richness and geographical factors (island area, elevation, distance from island/mainland) was steeper for endemic species richness than for total richness. Finally, the different scales of endemicity (single-island endemics, island group endemics and Aegean regional endemics) displayed similar qualitative trends and only differed quantitatively. Thus, we conclude that different biogeographical factors act as drivers for total species richness than for endemic species richness.

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Contribution to the study of the flora and vegetation of the Kithira island group: Offshore islets of Kithira (S Aegean, Greece)

Cited by 13 publications

References 11 publications

ORIGINAL ARTICLE: Turnover of plants on small islets of the eastern Aegean Sea within two decades

ORIGINAL ARTICLE: Turnover of plants on small islets of the eastern Aegean Sea within two decades

From plots to islands: species diversity at different scales

Biogeographical determinants for total and endemic species richness in a continental archipelago

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