Theodora Petanidou - Academia.edu (original) (raw)

Papers by Theodora Petanidou

Cheilosia candida Vujić et Radenković sp. n. ZooBank link: urn:lsid:zoobank.or... more Cheilosia candida Vujić et Radenković sp. n. ZooBank link: urn:lsid:zoobank.org:act: 316154DF-6472-4362-9269-F484233B277B Figs 1A, 1 C–D, 3, 4 Type material. HOLOTYPE. Greece, ♂, pinned, in NBCN. Original label: "Griekenland, Prov. Pindos gebergte, Plaats Kalliroi, 19.v.1988, leg. G. den Hollander " (det. as Cheilosia longula by G. den Hollander, 1984). Diagnosis. Species related to Cheilosia paralobi, but differs in the following characters: face partly microtrichose on genae, along paraface and between antennae and facial tubercle in C. candida sp. n. (Fig. 1A), while in C. paralobi entire face microtrichose, except facial tubercle (Fig. 1B); basoflagellomere of male partly reddish in C. candida sp. n. (Fig. 1D), while in C. paralobi almost completely black (Fig. 1E) (in some specimens inner side basally with paler macula); frons covered with intermixed black and yellow pile in C. candida sp. n., while in C. paralobi only with yellow pile. Male genitalia: surstylus shorter in C. candida sp. n., about three times longer than broad basally (Fig. 4B), while in C. paralobi very narrow apically and elongated, more than five times longer than broad basally (Fig. 5E). Description. MALE. Head (Figs 1A, 1 C–D). Antennae dark, brown-reddish; basoflagellomere dark-brown with reddish macula basoventrally, ellipsoidal, about 1.3 times as long as broad, and 3.5 longer than pedicel; arista 1.5 times longer than antennae, covered with short pile (Fig. 1D); face wide, 1/2 of the width of head anteriorly, covered with long, pale-yellow pile along paraface in upper 1/3 (Fig. 1A); facial tubercle rounded; genae, face between antennae and facial tubercle, and along paraface covered with grey microtrichia; frons convex, shiny, covered with mixed yellow and black pile; vertex convex and shiny; ocellar triangle equilateral, covered with mixed yellow and black pile; eyes bare; eye contiguity shorte [...]

Ecography, 2021

Maintaining the diversity of wild bees is a priority for preserving ecosystem function and promot... more Maintaining the diversity of wild bees is a priority for preserving ecosystem function and promoting stability and productivity of agroecosystems. However, wild bee communities face many threats and beekeeping could be one of them, because honey bees may have a strong potential to outcompete wild pollinators when placed at high densities. Yet, we still know little about how beekeeping intensity affects wild bee diversity and their pollinator interactions. Here, we explore how honey bee density relates to wild bee diversity and the structure of their pollination networks in 41 sites on 13 Cycladic Islands (Greece) with similar landscapes but differing in beekeeping intensity. Our large-scale study shows that increasing honey bee visitation rate had a negative effect on wild bee species richness and abundance, although the latter effect was relatively weak compared to the effect of other landscape variables. Competition for flowering resources (as indicated by a resource sharing index) increased with the abundance of honey bees, but the effect was more moderate for wild bees in family Apidae than for bees in other families, suggesting a stronger niche segregation in Apidae in response to honey bees. Honey bees also influenced the structure of wild bee pollination networks indirectly, through changes in wild bee richness. Low richness of wild bees in sites with high honey bee abundance resulted in wild bee networks with fewer links and lower linkage density. Our results warn against beekeeping intensification in these islands and similar hotspots of bee diversity, and shed light on how benefits to pollination services of introducing honey bees may be counterbalanced by detriments to wild bees and their ecosystem services.

Economic Botany, 2019

el grupo E y D. Conclusión. La TPA es útil para el aprendizaje cooperativo. El alumnado valora po... more el grupo E y D. Conclusión. La TPA es útil para el aprendizaje cooperativo. El alumnado valora positivamente el trabajo en grupo reducido y su realización en el aula. Existen difi cultades en la comprensión inicial del funcionamiento de la TPA. Planteamos revisar la guía facilitada e incrementar el tiempo de realización de la actividad.

People and Nature, 2019

This is an open access article under the terms of the Creative Commons Attribution License, which... more This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Frontiers in Plant Science, 2018

Journal of Apicultural Science, 2016

Honey bees are globally regarded as important crop pollinators and are also valued for their hone... more Honey bees are globally regarded as important crop pollinators and are also valued for their honey production. They have been introduced on an almost worldwide scale. During recent years, however, several studies argue their possible competition with unmanaged pollinators. Here we examine the possible effects of honey bees on the foraging behaviour of wild bees on Cistus creticus flowers in Northern Greece. We gradually introduced one, five, and eight honey-bee hives per site, each containing ca. 20,000 workers. The visitation frequency and visit duration of wild bees before and after the beehive introductions were measured by flower observation. While the visitation frequencies of wild bees were unaffected, the average time wild bees spent on C. creticus increased with the introduction of the honey-bee hives. Although competition between honey bees and wild bees is often expected, we did not find any clear evidence for significant effects even in honey-bee densities much higher tha...

Insect Conservation and Diversity, 2016

The objective of this study was to obtain a biogeographical perspective on the hoverfly genus Mer... more The objective of this study was to obtain a biogeographical perspective on the hoverfly genus Merodon (Diptera, Syrphidae) based on data from 32 islands in the Aegean and Ionian archipelagoes vis‐à‐vis the adjacent mainland. In this part of the world, the genus comprises 57 species, out of more than 160 species described worldwide. The importance of eco‐geographical variables (area, elevation, distance to the nearest island and distance to the nearest mainland) and the species–area relationship (SAR) were studied in order to explain patterns of species richness. All tests supported the dynamic equilibrium concept. The area and distance to closest island were found to be the most important drivers of species richness on the Aegean and Ionian archipelagoes. Out of three SAR models evaluated in this study, the exponential function fitted our data best. It was found that a power model with no intercept value (C = 1) performed even better by using symbolic regression for non‐linear equation optimisation. The cluster and null‐model analyses performed to detect inter‐island similarities and origins of the insular Merodon fauna indicated a clear influence of colonisation history of the species on different islands. The results imply that the current distributions of Merodon species in the study area exhibit the combined effects of historical and present‐day processes.

Supplementary Data 1: The weighted plant-pollinator interactions network inclu... more Supplementary Data 1: The weighted plant-pollinator interactions network including 41 plant and 168 insect species, recorded in a Mediterranean scrubland (phrygana) in Lesvos Island, Greece. Supplementary Data 2: Inflorescence volatile compounds of the plant species studied.

A complete list of the detected bee species along with the total numbers of individuals that were... more A complete list of the detected bee species along with the total numbers of individuals that were collected with the tested methods.

FIGURE 4. Lateral view of male terminalia of Brachyopa minima sp. nov.; A – B: epandrium and hypa... more FIGURE 4. Lateral view of male terminalia of Brachyopa minima sp. nov.; A – B: epandrium and hypandrium; C: aedeagus. Scale = 0.25 mm.

Psilota anthracina Taxonomic notes. Speight (2020) recogniz... more Psilota anthracina Taxonomic notes. Speight (2020) recognized the problems associated with recognition of Psilota anthracina based on male genitalia features, because of the differences in the figures given by Smit & Zeegers (2005) and Smit & Vujić (2008). In order to resolve this confusion, we studied available European material, including specimens from the Balkan Peninsula, and particularly checked original specimens whose drawings were presented in the two above mentioned publications referred to. After detailed analysis, we concluded that all specimens belong to Psilota anthracina, and that the main reason for the differences in these drawings was a different angle of observation and additionally a slightly aberrant epandrium in the Montenegro specimen figured by Smit & Vujić (2008). Examined material (published). Smit and Vujić (2008): Austria: 1♀, Carinthia, Eisenkappel, 24.iv.1955, (NBCN); Belgium: 1♀, Hautes Fagnes, 7.vi.2004, leg. B.Wakkie (coll. BW); 1♀, Malmedi, Mont Rigi, 29.v.2005, leg. W. Renema (coll. WR); 1♀, Ottenburg, Rodebos, 25.v.2005, leg. F. v. d. Meutter (coll. FvdM); Croatia: 1♀, Zagreb, Sljeme, 1000m, 27.v.1969; 2f, 30.v.1969, leg. Lambeck (NBCN); England: 1♂, Brockenhurst, 7.v.1945, leg. Wainwright (coll. TN); 1♀, Monach. (= Outer Hebrides?) (NBCN); France: 3♀, Col de Jeau, Mosset, 9–15.vi.2003, leg. M. Willemse (coll. MW); 1♂ + 4♀, Ile de France, Foret d Evry, 25.v.1997, leg. A. v. Eck (coll. AvE); Germany: 1♀, Sachsen-Anhalt, 3km NO Aken, 15.v.2002, leg. F. Dziock (coll. FD); Greece: 1♀, Ipiros, Peristeri Mts., 12–1700m, 24–8.v.1994, leg. S. Andersen (coll. CC); Italy: 1♀, Raibl (nowadays Cave del Predil), vii.1897, leg. Bergenstamm (NMW); Montenegro: 1♂ + 1♀, Boka Kotorska, Morinj, 5.v.1991; 4♂ + 1♀, 4.v.1994; 1m, 7.v.1994; 1m +1f, 1–3.v.1997; 1♀, 12.v.1997; 3m +1f, 7.v.1998; 1f, Durmitor, Sušičko jezero-Zlatica, 19.v.2000 (FSUNS); Netherlands: 1♀, Boxtel, 16.v.2005, l [...]

Psilota aegeae Vujić, Ståhls et Smit sp. n. ZooBank link: urn:lsid:zoobank.org... more Psilota aegeae Vujić, Ståhls et Smit sp. n. ZooBank link: urn:lsid:zoobank.org:act: C15AA253-D7AB-4BE7-BAAE-F7617409E9B6 Figs 9, 10, 11A, C Type material. HOLOTYPE: Greece, ♂, pinned, in FSUNS. Original label: "Agiassos, 21.iv.2007, Sanatorio Site, leg. Pérez-Bañón C. & Vujić A.". PARATYPES: Greece: 1♂ + 1♀, same locality as holotype, Lesvos, Agiassos, Sanatorio Site, 39°06'00.26"N 26°21'25.45"E, 21.iv.2007, leg. C. Pérez-Bañón, A. Vujić (FSUNS); 1♂ + 2♀, Lesvos, Agiassos, 39°06'00.26"N 26°21'25.45"E, 13.iv.2013, leg. A. Vujić (FSUNS); 1♂, Lesvos, Agiassos, 39°06'00.26"N 26°21'25.45"E, 8.v.2007, leg. G. Ståhls (MZH; collection code http://id.luomus.fi/GJ.2051 ♀, Lesvos, Agiassos, 39°06'00.26"N 26°21'25.45"E, 9.v.2007, leg. G. Ståhls (MZH; DNA voucher, collection code http://id.luomus. fi/GJ.2501 and http://id.luomus.fi/GJ.2052 1♂, Lesvos, Megali Limni, 28.iv.2008, 39°05'49"N 26°19'55"E, leg. G. Ståhls (MZH; http://id.luomus.fi/GJ.2053 1♂, Lesvos, Megali Limni, 39°05'49"N 26°19'55"E, 9.v.2009, leg. G. Ståhls (MZH; http://id.luomus.fi/GJ.2054 1♂, Lesvos, Megali Limni, 39°05'49"N 26°19'55"E, 9.v.2009, leg. G. Ståhls (MZH; http://id.luomus.fi/GJ.2055 1♂, Lesvos, Megali Limni, 1.v.2008, 39°05'49"N 26°19'55"E, leg. G. Ståhls (MZH; DNA voucher http://id.luomus.fi/GJ.2655 1♂, Lesvos, 30.iv.2008, leg. S. Radenković (FSUNS). Diagnosis. Psilota aegeae sp. n. belongs to the P. atra species group, with metafemur in male not swollen (Fig. 9E) and epandrium in male genitalia longer than broad, outer surstyle lobe shorter than inner surstyle lobe (Fig. 11 A–B). Antenna in female implanted in the upper half of the face (Fig. 10A), basoflagellomere about 2 times longer than broad, with clearly brown elongated macula basoventrally (Fig. 10A); abdomen covered with predominantly whitish pile, while the scutellum covered with whitish pile intermixed with the black ones (Fig. 10 C–D). Based on male genitalia characters, Psilota aegeae sp. n. is the most similar t [...]

Multiple stressors on biotic interactions: how climate change and alien species interact to affec... more Multiple stressors on biotic interactions: how climate change and alien species interact to affect pollination. Bio Rev

Historical climate-change influences modularity and nestedness of

Acta Oecologica, 2018

is invasive outside its ancestral North America range. • We compared its sexual reproduction in A... more is invasive outside its ancestral North America range. • We compared its sexual reproduction in Arizona, USA ("AZ") and Greece ("GR"). • Pollination in GR was by native bees that resemble ancestral AZ pollinators. • GR plants invest more in flowers and ovules but do not produce more seeds. • These results suggest promising avenues for further research.

Entomologia Experimentalis et Applicata, 2018

There is tremendous diversity of interactions between plants and other species. These relationshi... more There is tremendous diversity of interactions between plants and other species. These relationships range from antagonism to mutualism. Interactions of plants with members of their ecological community can lead to a profound metabolic reconfiguration of the plants' physiology. This reconfiguration can favour beneficial organisms and deter antagonists like pathogens or herbivores. Determining the cellular and molecular dialogue between plants, microbes, and insects, and its ecological and evolutionary implications is important for understanding the options for each partner to adopt an adaptive response to its biotic environment. Moving forward, understanding how such ecological interactions are shaped by environmental change and how we potentially mitigate deleterious effects will be increasingly important. The development of integrative multidisciplinary approaches may provide new solutions to the major ecological and societal issues ahead of us. The rapid evolution of technology provides valuable tools and opens up novel ways to test hypotheses that were previously unanswerable, but requires that scientists master these tools, understand potential ethical problems flowing from their implementation, and train new generations of biologists with diverse technical skills. Here, we provide brief perspectives and discuss future promise and challenges for research on insect-plant interactions building on the 16th International Symposium on Insect-Plant interactions (SIP) meeting that was held in Tours, France (2-6 July 2017). Talks, posters, and discussions are distilled into key

Zootaxa, 2011

Descriptions are given of three new cryptic species of Merodon Meigen (Diptera: Syrphidae) from t... more Descriptions are given of three new cryptic species of Merodon Meigen (Diptera: Syrphidae) from the island of Lesvos (Greece): Merodon latifemoris Radenković et Vujić n. sp. from the nigritarsis species group, Merodon pulveris Vujić et Radenković n. sp. from the natans species group and Merodon puniceus Vujić, Radenković et Pérez-Bañón n. sp. from the aureus species group. In addition to classical morphological characters, mitochondrial COI barcode sequences were generated for several specimens of each taxon.

Journal of Zoological Systematics and Evolutionary Research