Browsing by Author "Giokas, Sinos"
Now showing items 1-12 of 12
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Between-island compositional dissimilarity of avian communities
Pitta, Eva; Kassara, Christina; Tzanatos, Evangelos; Giokas, Sinos; Sfenthourakis, Spyros (2014)Compositional dissimilarity patterns of biotic communities can vary among different types of insular systems and among taxa with different dispersal abilities. In this work we examined compositional dissimilarity patterns ...
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A biogeographical analysis of Greek Oniscidean endemism
Sfenthourakis, Spyros; Giokas, Sinos (1998)Despite our incomplete knowledge of Greek Oniscidea, a great number of species have already been described, of which 69% are endemic. This unusually high percentage of endemics is a result of intense speciation triggered ...
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Compositional dissimilarity patterns of reptiles and amphibians in insular systems around the world
Pitta, Eva; Kassara, Christina; Giokas, Sinos; Sfenthourakis, Spyros (2013)Several studies have shown that taxa with poor dispersal ability have a higher level of compositional dissimilarity than good dispersers. However, compositional dissimilarity patterns between islands with respect to dispersal ...
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Current and future suitability of wintering grounds for a long-distance migratory raptor
Kassara, Christina; Gangoso, L.; Mellone, U.; Piasevoli, G.; Hadjikyriakou, T. G.; Tsiopelas, N.; Giokas, Sinos; López-López, P.; Urios, V.; Figuerola, J.; Silva, R.; Bouten, W.; Kirschel, A. N. G.; Virani, M. Z.; Fiedler, W.; Berthold, P.; Gschweng, M. (2017)Conservation of migratory species faces the challenge of understanding the ecological requirements of individuals living in two geographically separated regions. In some cases, the entire population of widely distributed ...
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Does by-catch pose a threat for the conservation of seabird populations in the southern ionian sea (eastern Mediterranean)? A questionnaire-based survey of local fisheries
Karris, Georgios; Fric, Jakob; Kitsou, Z.; Kalfopoulou, J.; Giokas, Sinos; Sfenthourakis, Spyros; Poirazidis, K. (2013)A significant number of studies worldwide have shown that incidental catches (by-catch) of seabirds in fishing gear might pose a considerable risk for the conservation of their populations. Nevertheless, reliable data on ...
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Estimating the population size of Scopoli's Shearwaters (Calonectris diomedea) frequenting the Strofades islands (Ionian Sea, western Greece) by raft counts and surveys of breeding pairs
Karris, Georgios; Xirouchakis, Stavros M.; Grivas, C.; Voulgaris, M. -D; Sfenthourakis, Spyros; Giokas, Sinos (2017)The Strofades Island complex in the Ionian Sea comprises two small islands, i.e. Stamfani and Arpyia, and several rocks. The islands host a significant Scopoli's Shearwater (Calonectris diomedea) colony, which is regarded ...
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From sampling stations to archipelagos: Investigating aspects of the assemblage of insular biota
Sfenthourakis, Spyros; Giokas, Sinos; Tzanatos, Evangelos (2004)Aim To investigate the formation of nestedness and species co-occurrence patterns at the local (sampling station), the intermediate (island group), and the archipelago scale. Location The study used data on the distribution ...
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An improved method for the identification of areas of endemism using species co-occurrences
Giokas, Sinos; Sfenthourakis, Spyros (2008)Aim: To develop a simple method that (1) combines the notions of biotic elements (groups of taxa with ranges significantly more similar to each other than to the ranges of other taxa) and of areas of endemism (AoE, areas ...
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Sex determination of scopoli's shearwater (calonectris diomedea) juveniles: A combined molecular and morphometric approach
Karris, Georgios; Thanou, E.; Xirouchakis, Stavros M.; Voulgaris, M. -D; Fraguedakis-Tsolis, S.; Sfenthourakis, Spyros; Giokas, Sinos (2013)The absence of juvenile sexual dimorphism in birds often impedes sex determination using external morphology. We examined sex ratio variation in Scopoli's Shearwater (Calonectris diomedea) fledglings (n = 135) on a Strofades ...
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Significant pairwise co-occurrence patterns are not the rule in the majority of biotic communities
Pitta, Eva; Giokas, Sinos; Sfenthourakis, Spyros (2012)Our aim was to investigate species co-occurrence patterns in a large number of published biotic communities, in order to document to what extent species associations can be found in presence-absence matrices. We also aim ...
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Species co-occurrence: The case of congeneric species and a causal approach to patterns of species association
Sfenthourakis, Spyros; Tzanatos, Evangelos; Giokas, Sinos (2006)Aim: To test whether congeneric species are significantly associated with one another in space, either positively or negatively. Also, to provide a framework for a causal investigation of co-occurrence patterns by a parallel ...
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Testing for nestedness in the terrestrial isopods and snails of Kyklades islands (Aegean archipelago, Greece)
Sfenthourakis, Spyros; Giokas, Sinos; Mylonas, Moisis (1999)Most insular communities exhibit nestedness, with the species assemblages of the more depauperate islands constituting subsets of those of the richer. Several methods for the estimation and evaluation of nestedness have ...