Hidden European diversity : a new monotypic hoverfly genus (Diptera: Syrphidae: Eristalinae: Rhingiini)

For the first time in more than 30 years, a new European hoverfly genus has been discovered, Katara gen. nov. Its type species Katara connexa sp. nov. (Diptera: Syrphidae) is described from the Pindos Mountains (Greece), and the systematic position of the monotypic taxon within the tribe Rhingiini is analysed using morphological and molecular data. Phylogenetic analyses resolved Katara connexa gen. et sp. nov. as sister taxon to Pelecocera latifrons. We assert based on the molecular phylogenetic results and the morphological distinctness of Pelecocera latifrons that this taxon merits a generic rank, thus we erect the genus Pseudopelecocera gen. nov. and also place Pelecocera persiana in this new genus based on shared characteristics. Based on our results, we place Chamaesyrphus in subgeneric rank and as a sister group to the nominal subgenus Pelecocera. We provide an identification key to the Rhingiini genera. Our phylogenetic analyses recovered all speciose Rhingiini genera as monophyletic and support existence of three main lineages within the tribe: (1) genus Rhingia with two groups, Palaearctic+Neotropical and Afrotropical taxa, (2) genus Cheilosia with its subgenera, and (3) lineage with remaining genera (Pseudopelecocera gen. nov., Katara gen. nov., Ferdinandea, Psarochilosia, Psarus, Portevinia and Pelecocera).Peer reviewe

Uklija (alburnus alburnus) kao potencijalni bioindikator zagađenja teškim metalima

Analize vode i/ili sedimenta mogu biti neefikasne u identifikovanju metala u fluvijalnim ekosistemima usled nerazdvojive varijabilnosti rečnog toka i koncentracije zagađivača. Monitoring zagađenja ribljih tkiva ima važnu ulogu ranog alarma koji ukazuje na probleme kvaliteta vode i sedimenta, a takođe omogućava detekciju toksičnih materija u ribama koje dalje mogu da imaju negativan efekat na konzumente. Reka Sava je tipična nizijska reka i najveća desna pritoka Dunava koja protiče kroz tri zemlje: Sloveniju, Hrvatsku i Srbiju. Do 1990-ih je bila izložena zagađenju iz metalurgije, hemijske, kožne, tekstilne, prehrambene i industrije celuloze i papira, ali i usled poljoprivrednih aktivnosti. Takođe je i glavni recipijent otpadnih voda mnogih gradova i zagađenih pritoka. Ciljevi ove studije su da se utvrde koncentracije Al, As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Se, Sn i Zn u kompostu uklije (Alburnus alburnus) kao potencijalne bioindikatorske vrste zagađenja teškim metalima reke Save, kao i da se izračuna Indeks zagađenja metalima (MPI-Metal Pollution Index) kako bi se uporedio status zagađenja različitih lokaliteta reke Save. Terensko istraživanje je sprovedeno tokom septembra 2014. godine. Uklije su sakupljene iz reke Save na sledećim lokalitetima: Čatež u Sloveniji, Zagreb i Slavonski Brod u Hrvatskoj, Jarak i Umka u Srbiji. Koncentracije Al, As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Se, Sn, i Zn su merene u kompozitnom uzorku uklije uz pomoć Thermo Scientific iCAP 6500 Duo ICP-OES (Thermo Fisher Scientific, Cambridge, United Kingdom). Prema dobijenim rezultatima, izdvaja se Zagreb sa najvećim brojem najviših koncentracija elemenata (Cd, Co, Cr, Fe, Pb, i Se). Takođe, najviši MPI je izračunat za Zagreb (0.23) u odnosu na Umku sa najnižim MPI (0.14). Na osnovu dobijenih rezultata, možemo označiti gornji tok reke Save kao znatno zagađeniji (posebno deo kod Zagreba u Hrvatskoj) od donjeg toka i ušća u Dunav kod Beograda (Umka)

Resolving the taxonomy of the Merodon dobrogensis species subgroup (Diptera: Syrphidae), with the description of a new species

The taxonomy of Merodon dobrogensis Bradescu, 1982 (Diptera: Syrphidae) species subgroup was reviewed. Multiple data sources (morphology, geometric morphometry of wings and surstylus, molecular data, and distributional data) were used to investigate the species subgroup in the manner of integrative taxonomy. Merodon dobrogensis Bradescu, 1982 and M. puniceus Vujic, Radenkovic, and Perez-Banon, 2011 are supported as distinct species belonging to the M. dobrogensis species complex within the M. dobrogensis species subgroup. Additionally, evidence is presented for the description of a new species, M. rojoi Radenkovic and Vujic new species, with a distribution in mainland Greece, the Greek island Euboea, and the Peloponnese. A short diagnosis is provided for the M. aureus species group, the M. dobrogensis species subgroup, and the newly defined M. dobrogensis species complex, in addition to a description of the new species, with drawings and photographs of adult morphology.Peer reviewe

Mogućnost konzervacije i održivog korišćenja plemenitog raka astacus astacus u Srbiji

Dekapodni rakovi su ključna komponenta biodiverziteta reka, jezera i močvara u kojima žive. Imaju važnu ekološku ulogu u pravilnom funkcionisanju slatkovodnih ekosistema. U svetu, trećini do polovini populacija slatkovodnih rakova preti smanjenje brojnosti, čak i iščezavanje. Isto se dešava i sa autohtonim populacijama plemenitog raka (Astacus astacus) širom Evrope, a posledica je klimatskih promena, zagađenja, degradacije staništa i račije kuge. Ni populacije ove vrste u slatkovodnim ekosistemima Srbije nisu izostavljene. Situacija je prilično ozbiljna kada se ima u vidu da im je brojnost opala: više od 65% u poslednjih 50 godina. Inače, plemeniti rak je jedna od tri vrste autohtonih, dekapodnih rakova koji naseljavaju slatkovodne ekosisteme Srbije. Nekada brojne populacije, sada su ograničene na fragmentisana staništa. Za razliku od drugih evropskih zemalja, u Srbiji ne postoji kultura konzumiranja ove vrste u ishrani, ne uzgaja se u akvakulturi i shodno tome izostaje ekonomski značaj. Jedino je ribolovci koriste kao mamac za lov riba, pa je tom prilikom nekontrolisano prenose iz jednog vodenog ekosistema u drugi. Poznato je da rakovi imaju ekološku, ekonomsku i društvenu vrednost, pa je razumljivo povećano interesovanje širom sveta za njih i stanje njihovih populacija poslednjih godina. Shodno tome, veliki broj naučnih radova je objavljen u vezi strategije očuvanja, menadžmenta/upravljanja i održivog korišćenja populacija plemenitog raka. Mogućnost za eksploataciju i ekonomska vrednost, kao i rekreativna korist možda će uticati da se lokalno stanovništvo više pozabavi zaštitom ove vrste. Cilj ovog rada je da ukaže na potrebu za održivo korišćenje i očuvanje vrste plemenitog raka

Close relatives of Mediterranean endemorelict hoverflies (Diptera, Syrphidae) in South Africa : Morphological and molecular evidence in the Merodon melanocerus subgroup

An ongoing study of the genus Merodon Meigen, 1803 in the Republic of South Africa (RSA) has revealed the existence of new species related to M. melanocerus Bezzi, 1915. The M. melanocerus subgroup belongs to the Afrotropical lineage of the M. desuturinus group. Revision of all available material from museums and detailed analyses of newly -collected specimens from our own expeditions to RSA resulted in delimitation of five species: M. capensis Hurkmans sp. n., M. commutabilis Radenkovic et Vujic sp. n., M. drakonis Vujic et Radenkovic sp. n., M. flavocerus Hurkmans sp. n. and M. melanocerus. In addition to classical morphological characters, sequences of the mitochondrial COI gene are provided for four related taxa. Results of molecular phylogenetic analyses supports monophyly of the M. desuturinus group and confirmed delimitation between species. Links between Palaearctic and Afrotropical faunas of this group, as well as possible evolutionary paths, are discussed. Based on phylogenetic analyses, four lineages (putative subgenera) have been recognized within the genus Merodon; besides the three previously established ones, albifrons+desuturinus, aureus (sensu lato) and avidus-nigritarsis, one new lineage named natans is distinguished.Peer reviewe

Molecular and Morphological Inference of Three Cryptic Species within the Merodon aureus Species Group (Diptera:Syrphidae)

The Merodon aureus species group (Diptera: Syrphidae: Eristalinae) comprises a number of different sub-groups and species complexes. In this study we focus on resolving the taxonomic status of the entity previously identified as M. cinereus B, here identified as M. atratus species complex. We used an integrative approach based on morphological descriptions, combined with supporting characters that were obtained from molecular analyses of the mitochondrial cytochrome c oxidase I gene as well as from geometric morphometry of wing and surstylus shapes and environmental niche comparisons. All applied data and methods distinguished and supported three morphologically cryptic species: M. atratus stat. nov., M. virgatus sp. nov. and M. balkanicus sp. nov., which constitute the M. atratus species complex. We present an identification key for the sub-groups and species complexes of the M. aureus species group occurring in Europe, describe the taxa and discuss the utility of the applied methods for species delimitation. The estimated divergence times for the species splits of these taxa coincide with the Pleistocene Gunz-Mindel interglaciation and the Great interglaciation (between the Ris and Mindel glacial periods).Peer reviewe

The Merodon planifacies subgroup (Diptera, Syrphidae) : Congruence of molecular and morphometric evidences reveal new taxa in Drakensberg mountains valleys (Republic of South Africa)

Hoverflies (Syrphidae) represent an insect group of great importance in ecosystems and indicators of ecosystem change. The genus Merodon Meigen, 1803 (tribe Merodontini) is one of the most species-rich hoverfly genera, distributed across the Palaearctic and Afrotropical regions. The genus Merodon Meigen, 1803 is less diverse in the Afrotropical Region than in the Palaearctic (11 versus 160 known species). An ongoing study of the genus Merodon in Africa has revealed the existence of two new species into the taxon previously known as Merodon planifacies Bezzi, 1915. The M. planifacies subgroup belongs to the Afrotropical lineage of the Merodon desuturinus group. Morphological analysis of male genitalia has classified the available specimens of the M. planifacies taxon into two sets: the first one corresponds to M. planifacies with folded theca, while the other with smooth theca, later named Merodon capi complex was found exclusively at the Drakensberg mountains in the Republic of South Africa, specifically in the Cathedral Peak National Park and the Royal Natal National Park. Further, molecular and morphometric evidences revealed two cryptic taxa within this complex: M. capi sp. nov. Vujic et Radenkovic and Merodon roni sp. nov. Radenkovic et Vujic. (c) 2020 Elsevier GmbH. All rights reserved.Peer reviewe

Defining species boundaries in the Merodon avidus complex (Diptera, Syrphidae) using integrative taxonomy, with the description of a new species

Several recent studies have detected and described complexes of cryptic and sibling species in the genus Merodon (Diptera, Syrphidae). One representative of these complexes is the Merodon avidus complex that contains four sibling species, which have proven difficult to distinguish using traditional morphological characters. In the present study, we use two geometric morphometric approaches, as well as molecular characters of the 5' -end of the mtDNA COI gene, to delimit sibling taxa. Analyses based on these data were used to strengthen species boundaries within the complex, and to validate the status of a previously-recognized cryptic taxon from Lesvos Island (Greece), here described as Merodon megavidus Vujic & Radenkovic sp. nov. Geometric morphometric results of both wing and surstylus shape confirm the present classification for three sibling species-M. avidus (Rossi, 1790), M. moenium Wiedemann in Meigen, 1822 and M. ibericus Vujic, 2015-and, importantly, clearly discriminate the newly-described taxon Merodon megavidus sp. nov. In addition to our geometric morphometric results, supporting characters were obtained from molecular analyses of mtDNA COI sequences, which clearly differentiated M. megavidus sp. nov. from the other members of the M. avidus complex. Molecular analyses revealed that the earliest divergence of M. ibericus occurred around 800 ky BP, while the most recent separation happened between M. avidus and M. moenium around 87 ky BP.Peer reviewe

The Amount of Weight Loss Six Months after Bariatric Surgery: It Makes a Difference

Background: Bariatric surgery, especially Roux-en-Y gastric bypass (RYGB), has become the most frequently used therapy for morbid obesity. Objectives: The aim of this study was to examine the effects of surgically induced weight loss on cardiopulmonary function 6 months after the procedure, as well as the effect of such an intervention on well-known risk factors for cardiovascular diseases. Methods: This is a cross-sectional study on 66 morbidly obese patients (BMI ≥40 or ≥35 kg/m2 with present comorbidities), comparing their cardiopulmonary function prior to and 6 months after RYGB surgery. Results: The substantial amount of weight loss (29.80 ± 13.27 kg) after RYGB surgery was associated with significant reduction of comorbidities, especially diabetes and sedentary lifestyle (p = 0.005 and p = 0.002, respectively). Regarding functional capacity, there was significant increase in peak oxygen uptake (VO2 peak, p = 0.003), duration of exercise testing, metabolic equivalents (exercise time and METs, p < 0.001), and in peak O2 pulse. These findings were particularly pronounced in a group of patients who had lost more than 18% of initial weight. Conclusions: Reduction of body weight after RYGB surgery is associated with significantly improved cardiorespiratory function 6 months after surgery, especially in patients who lost more than 18% of their initial body weight. In addition, substantial decreases in body weight were also associated with a reduction of cardiovascular risk factors such as diabetes, smoking, hypertriglyceridemia, and sedentary lifestyle

Revision of the Merodon serrulatus group (Diptera, Syrphidae)

The phytophagous hoverfly genus Merodon Meigen, 1803 (Diptera, Syrphidae), which comprises more than 160 species distributed in Palaearctic and Afrotropical regions, can be differentiated into multiple groups of species that harbor high levels of hidden diversity. In this work, the serrulatus species group of Merodon is revised, providing an illustrated key to species, a detailed discussion on the taxonomic characters and a morphological diagnosis, including also the first data about the preimaginal morphology of this species group. The study includes characteristics of the 13 species of the M. serrulatus group, along with the available distributional data. Moreover, descriptions are provided for seven new species, namely M. defectus Vujic, Likov & Radenkovic sp. nov., M. disjunctus Vujic, Likov & Radenkovic sp. nov., M. medium Vujic, Likov & Radenkovic sp. nov., M. nigrocapillatus Vujic, Likov & Radenkovk sp. nov., M. nigropunctum Vujic, Likov & Radenkovic sp. nov., M. opacus Vujic, Likov & Radenkovk sp. nov., and M. trianguloculus Vujic, Likov & Radenkovk sp. nov. In addition, the taxa M. serrulatus (Wiedemann in Meigen, 1822), M. bequaerti Hurkmans, 1993, M. birsutus Sack, 1913, M. kawamurae Matsumura, 1916, M. sacki (Paramonov, 1936) and M. sophron Hurkmans, 1993 are redefined and redescribed. Following a detailed study of the type material sourced from different entomological collections, the status of all available taxa related to M. serrulatus is revised and a new synonymy is proposed: M. tener Sack, 1913 syn. nov. (junior synonym of M. serrulatus). The identity of M. trizonus (Szilady, 1940) could not be assessed as the type specimens are lost. Thus, the name M. trizonus is considered as nomen dubium. The monophyly and composition of this species group are assessed through Maximum Parsimony and Maximum Likelihood analyses of the mitochondrial COI and nuclear 28S rRNA gene sequences.Peer reviewe