Nikola Tvrtković

Nikola Tvrtković
Croatian Natural History Museum

About

139
Publications
32,802
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1,507
Citations
Citations since 2017
11 Research Items
584 Citations
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100

Publications

Publications (139)
Article
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Alpiscorpius liburnicus sp. n. is described from Krk Island, Croatia, as the first cave dwelling scorpion species in the genus. Clear differences from the genetically closest epigean species were found in metasomal morphometry. Its delineation is supported phylogenetically based on mitochondrial (COI and 16S rRNA) and nuclear (ITS1) markers. In the...
Article
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Exhibiting manifold ecological impacts on terrestrial biota, roads have become a major driver of environmental change nowadays. However, many insect groups with high indication potential, such as grasshoppers and crickets (Orthoptera), have been largely neglected in road ecology research from a functional perspective. Using two complementary sampli...
Article
The systematics and taxonomy of the scorpion family Euscorpiidae are still unresolved, and, within it, the eastern Adriatic scorpiofauna is largely unknown and under-researched. Based on two mitochondrial sequences (COI and 16S rRNA) and one nuclear marker sequence (ITS1), we put 107 newly analyzed samples originating from the Alps, the Eastern Adr...
Article
• Major roads have become significant components of environmental change but their impacts on invertebrate assemblages are insufficiently understood, and therefore rarely considered in road-planning and management. • In the current study, we test (i) whether and how orthopteran assemblages change with distance from a motorway, and (ii) how road-ind...
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The Horvath’s rock lizard Iberolacerta horvathi (Méhely, 1904) is an understudied lacertid species, which is geographically isolated from its congeners and currently classified as Near Threatened under IUCN red listing criteria. Due to its limited distribution and narrow environmental preferences, we expect that the species had been affected by pas...
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Lička Plješevica is an elongated mountain massif situated in the Croatian Lika region, at the border with Bosnia and Herzegovina. It was never a target of any systematic butterfly surveys, and its butterfly fauna was poorly studied. During our surveys from 2007 to 2019, we recorded 142 butterfly species on 71 localities. Along with the records from...
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During a study conducted in 2018 on Mt Sniježnica,the faunistically understudied southernmost karst mountain in Croatia, altogether 42 orthopteran and three mantid species were recorded at 18 localities at different altitudes. Two Poecilimon taxa new to Croatian fauna were found, one of them an undescribed species from the elegans group. Three bush...
Book
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The first annotated checklist of crickets and grasshoppers (Orthoptera) of Croatia is presented. With 184 orthopteran species, 103 Ensifera and 81 Caelifera, known to inhabit the country, Croatia is among the richest European countries in terms of Orthoptera diversity. Altogether 25 species erroneously reported from the country are omitted from the...
Article
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The insect fauna of the Dinarides is not widely studied. In 2013 and 2014, an orthopterological survey wasconducted on the Poštak Mountain and its surroundings in the Lika region (Croatia), in order to sample the orthopterancommunities of the prominent habitat types of the area. From 24 sampling sites, 80 Orthoptera species (44 Ensifera and 36Caeli...
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A study of the butterfly fauna of the Croatian island of Korčula is presented. Fieldwork was carried out from 2011 to 2017, during several visits in different vegetation seasons, from the end of April until November. Altogether, 53 species were recorded during the survey, including 21 new records for the island. Along with literature records, 60 bu...
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First finding of Gryllotalpa stepposa Zhantiev, 1991, a species typical of lowland steppe area of Eastern Europe, is documented for Croatia based on the shape of chitinized part of the epiphallus and the density of stridulatory teeth on male tegmen. All specimens from Valpovo, Podravina sample were brachypterous, which is usual for this species, mo...
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The presence of the Grecian anomalous blue, Polyommatus (Agrodiaetus) aroaniensis (Brown, 1976) in Croatia has been recently published based on external morphology of collected specimens. The aim of this study was to evaluate the credibility of these findings by using DNA barcoding approach as the species exhibit phenotypic variability and can easi...
Article
Personal notes discovered in the papers of Croatian mammalogist Professor Beatrica Đulić were used to assess the reliability of the identification of the findings of Rhinolophus mehelyi Matschie, 1900, in Croatia from 1952 to 1968. Because no voucher specimens exist, analysis of the original description of caught specimens, measurements from Đulić’...
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During the last eight years several surveys were undertaken to improve the knowledge of the butterfly distribution in Croatia. In this paper we provide additional data for Mt Velebit for some taxa with poorly known distributions like Pieris (napi) balcana Lorković, 1970 as well as the first records for Carterocephalus palaemon, Gegenes pumilio, Lyc...
Article
Character displacement and release can occur quickly in novel environments and communities. Species introductions are ‘natural experiments’ in which evolutionary changes can be studied as community composition varies. We asked whether morphologies of the introduced small Indian mongoose (Herpestes auropunctatus) and the larger native stone marten (...
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In this paper we deal with a not well known orthopteran species described from Croatia—Krauss' bush-cricket, Platycleis kraussi Padewieth, 1900 with unknown type series. After systematic field studies the species was found only three kilometres from Padewieth's locus typicus, in Francikovac near Senj (Croatia). It was found to be the same as Bicolo...
Article
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The polyneopteran insect fauna of Dinara Mountain area has been poorly studied in the past, with only scarce data published on the topic. During a study conducted in 2012 and 2013, a total of 19 better-investigated localities were visited and 68 species of Blattodea, Mantodea and Orthoptera were recorded for the first time in the investigated area,...
Article
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A review of the Croatian and Serbian Tetrigidae is given and first records of Tetrix undulata (Sowerby, 1806) for Croatia and Serbia as well as Tetrix tuerki (Krauss, 1876) and Tetrix transsylvanica (Bazyluk & Kis, 1960) comb. nov. for Croatia are presented. The status of the genus Uvarovitettix Bazyluk & Kis, 1960 and the taxonomic position of T....
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The article presents results from a reptile survey conducted between 14 and 16 June 2013 in a mon-tane and subalpine belt of the western part of Dinara Mountain in Croatia. The most interesting result is the southernmost finding of Horvath's Rock lizard (Iberolacerta horvathi). In the survey area we also recorded eight other reptile species: Anguis...
Book
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European bats are a species-rich group widely distributed through the range of agricultural and non-agricultural landscapes and habitats that form the wider countryside. The landscape of Europe has been and continues to be affected by intensive and varied human influences that have had widespread and sometimes devastating effects on bat populations...
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During a butterfly inventory from 2005 to 2012 on Mt Dinara along the transect from Knin to the Sinjal peak (1831 m a.s.l.), 116 species were found. There are 23 newly-found species for the Mt Dinara area, and 7 species have not been confirmed. With 130 registered species this area is a hot spot of butterfly diversity. 15 species belong to Alpine e...
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Data on genetics and morphometrics of Myotis alcathoe from Croatia is presented.
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The first data on the occurence of the species Colias caucasica balcanica in Croatia are presented. Findings of this species from Mt Dinara (Croatia) in 2010 and 2011 represent the westernmost distribution point. Unlike in the south-eastern Balkans, where the distribution of C. caucasica balcanica is mainly subalpine, in the Dinaric Alps published...
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This paper presents information about the first records of maternity colonies of Eptesicus serotinus in Croatia. Records of maternity colonies along with the location where a fertile female was captured are presented on a map.
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The small Indian mongoose (Herpestes auropunctatus) is one of the world’s 100 worst invasive species (IUCN 2000). It has negative impacts on several small mammals on islands where it was introduced. We assess the abundance of small mammal populations and the activity time of introduced ship rats (Rattus rattus) on three mongoose-infested and three...
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Geographic isolation, altitude, climate, landscape and habitat are significant predictors of butterfly diversity in mountain ecosystems. Their diversity and its dependence on altitude, aspect (compass bearing) and biogeographic characteristics of the butterflies were surveyed on the karst mountain Biokovo in southern Croatia. The results affirm tha...
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The authors researched changes in specific habitat types in areas considered to be the most important in Croatia for protection of endangered bird fauna during the period 1990–2000. The analysis focused on four areas in the continental part of Croatia (Danube and Drava River alluvium, Pokupsko depression, Sava River basin, Upper Drava River basin)...
Article
Molluscs are a diverse and ubiquitous group of organisms which contribute to the formation of biogenic sediments and are one of the major prey taxa for the neritic-stage loggerhead sea turtles (Caretta caretta) worldwide. Here we investigated to what degree molluscs contribute to the diet of individual turtles, and what role the feeding strategy of...
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The distribution of twelve resident species of bats in Croatia listed in Appendix II of the Habitats Directive 92/43/EEC was mapped in 10 km squares of the UTM projection grid: Rhinolophus blasii, R. euryale, R. ferrumequinum, R. hipposideros, Myotis bechsteinii, M. blythii, M. capaccinii, M. dasycneme, M. emarginatus, M. myotis, Barbastella barbas...
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We explored patterns of size variation for mainland and island populations of Erinaceus roumanicus. Size was expressed either as the condylobasal length of the skull or as the first eigenvector obtained from a principal components analysis of a correlation matrix with four cranial variables. Both estimators were highly correlated. The pattern of si...
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In this paper we examine the distribution of amphibians and reptiles over the islands of the newly founded Lastovo Archipelago Nature Park (Lastovsko oto~je), Croatia. On several field trips between 1996 and 2008, we encountered five species of lizards (Podarcis sicula, P. melisellensis, Dal- matolacerta oxycephala, Hemidactylus turcicus and Pseudo...
Article
Aim We analysed the population genetics of the brown hare (Lepus europaeus) in order to test the hypothesis that this species migrated into central Europe from a number of late glacial refugia, including some in Asia Minor. Location Thirty-three localities in Greece, Bulgaria, Italy, Croatia, Serbia, Poland, Switzerland, Austria, France, Germany, t...
Article
We review the occurrence of leatherback turtle (Dermochelys coriacea) in the eastern Adriatic Sea based upon museum collections and published literature, and present six new records. Eight out of 13 records (61.5 %) derived from fishery bycatch, with gillnets being a dominant threat to leatherbacks in the region. Findings were concentrated between...
Article
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Sea turtles exhibit sexual dimorphism only as adults, hence diagnosing the sex of hatchlings and juveniles requires the employment of different techniques that vary in their level of accuracy and costs. In order to validate the observation of external gross morphology of gonads as a sexing method for juveniles, we compared results obtained in this...
Article
strong>Abstract After the discovery of two different phonic types within the common pipistrelle ( Pipistrellus pipistrellus ), mtDNA analysis confirmed the existence of two separate species named as common pipistrelle ( P. pipistrellus ) and soprano pipistrelle ( P. pygmaeus ). The discrimination of these two cryptic species using external charact...
Article
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Using mitochondrial DNA (mtDNA) variations, the phylogenetic position of Croatian populations of spined loaches within the European genus Cobitis was assessed. Spined loaches from the Matica, Neretva, Cetina, Zrmanja, Jadova, Sava, Drava and Kupa Rivers are included in two previously described groups: a) Cobitis sensu stricto group, and b) Adriatic...
Article
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The endemic butterfly Erebia stirius kleki Lorković, 1955 was found at Klečice (Klek Mountain, western Croatia), representing the known occurrence of this subspecies in Croatia. The biology of the species, the characteristics of a newly found site and the threat status of this endemic subspecies are also briefly discussed.
Article
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The endemic butterfly Erebia stirius kleki Lorković, 1955 was found at Klečice (Klek Mountain, western Croatia), representing the known occurrence of this subspecies in Croatia. The biology of the species, the characteristics of a newly found site and the threat status of this endemic subspecies are also briefly discussed.
Article
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This article presents the first data about the presence of the species Grecian Copper Lycaena ottomanus (Lefèbvre, 1830) (Lycaenidae, Lycaeninae) in Croatia. For the first time, the species was recorded on Sniježnica Mountain (south-eastern Croatia, southern Dalmatia), in Kuna Konavoska village (720 a.s.l.) on June 30, 2005. The first record of the...
Article
In a phylogeographical survey of the Italian wall lizard, Podarcis sicula, DNA sequence variation along an 887-bp segment of the cytochrome b gene was examined in 96 specimens from 86 localities covering the distribution range of the species. In addition, parts of the 12S rRNA and 16S rRNA genes from 12 selected specimens as representatives of more...
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A b s t r a c t. The variability of the external characters of four sibling Plecotus species in Croatia was analysed. For the recently discovered species P. macrobullaris and P. kolombatovici we used specimens identified by mitochondrial DNA sequences as key specimens. Living individuals of P. kolombatovici can be distinguished from P. macrobullari...
Article
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The altitudinal distribution of bats of four Plecotus species in Croatia was analysed. P. austriacus and P. Kolombatovici are restricted to lower altitudes, under 800 m a.s.l.. P. auritus inhabits continental forest habitats preferably beech forests, with the exception of Pannonian lowland riparian forests of common oak which also lie under 100 m a...
Article
A 903bp section of the mitochondrial cytochrome b gene was sequenced from 73 specimens of Podarcis melisellensis collected at 52 localities distributed over the major part of the species’ range. In addition, parts of the 12S (about 470bp) and 16S rRNA (about 500bp) genes were analysed for 11 representative samples leading to a congruent phylogeny....