Laszlo Rakosy

Laszlo Rakosy
Babeş-Bolyai University | UBB · Department of Taxonomy and Ecology

PhD, Prof.

About

167
Publications
51,622
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2,797
Citations
Additional affiliations
September 2001 - present
Babeş-Bolyai University
Position
  • Head of Department, Prof.dr.

Publications

Publications (167)
Preprint
Social systems are attractive targets for parasites. Once infiltrated they could manipulate the host to contribute to their further dispersal. A wide array of parasites causes summit disease driving their host up on a grass blade from where propagules are then dispersed. In ants, previous observations suggested the existence of a social prophylacti...
Article
Full-text available
Poecilocampa alpina (Frey & Wullschlegel, 1874) is reported for the first time in the Romanian fauna. The specimen was collected from Porumbenii Mari, Harghita County, Romania. According to the distribution area, respectively to the ecological requirements, Romanian population belongs to the subspecies P. alpina canensis. This reported population i...
Article
The article discloses the AMS (accelerator mass spectrometry) radiocarbon dating results of the historic Big Tree at Victoria Falls, Zimbabwe. The research aimed to determine the age, growth and architecture of this renowned African baobab. The superlative baobab is composed of five main stems, three young stems and one false stem. It exhibits an o...
Article
Full-text available
Over the past years, our research on baobabs mainly focused on the largest Malagasy species, namely the Reniala or Grandidier baobab (Adansonia grandidieri Baill.). The biggest A. grandidieri are located in the Morombe area, especially in the so-called Andombiry Forest. This giant forest of Reniala hosts well over 6000 mature individuals, out of wh...
Article
Cultural landscapes, shaped by centuries of traditional low-intensity agricultural practices, have been declining all over the world. In Transylvania (Romania), traditionally mown and extensively grazed grasslands have been part of a diverse landscape mosaic for centuries. In contrast to Western European countries, these species-rich grasslands are...
Chapter
The widespread use of pesticides, changes in the structure of the landscape due to industrial and agricultural uses, and climate change have massively affected insect populations. The decline in insect biodiversity and biomass is documented in some countries in Europe, Asia, and North America. Romania, compared to Western and Central European count...
Article
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Stenoptilia pneumonanthes este pentru prima dată semnalată în România, de la Răscruci, Județul Cluj. Indivizii au fost colectați din teren sub formă de larve și crescuți în laborator. Determinarea s-a făcut cu ajutorul armăturii genitale. Abstract. Stenoptilia pneumonanthes is recorded for the first time in Romania, at Rascruci, Cluj county. The in...
Article
Full-text available
The oak forest from Popeni is situated near the locality with the same name, in Salaj County and it is an unstudied area in terms of lepidopterologic matter. This paper presents the results of investigations on Macrolepidoptera in this area, made during the period of 8.07.2005-31.07.2005, bringing contributions to the knowledge of the butterflies o...
Article
Full-text available
Stenoptilia pneumonanthes este pentru prima dată semnalată în România, de la Răscruci, Județul Cluj. Indivizii au fost colectați din teren sub formă de larve și crescuți în laborator. Determinarea s-a făcut cu ajutorul armăturii genitale. Abstract. Stenoptilia pneumonanthes is recorded for the first time in Romania, at Rascruci, Cluj county. The in...
Experiment Findings
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During recent field surveys, a new Ceylon iron wood (Manilkara hexandra) population was discovered in the Upper Ganga Ramsar Site, Uttar Pradesh (UP), India. The largest specimen located at Van Khan-deshwar partially collapsed in 2012, which led to a canopy impairment. The rupture enabled direct extraction of samples close to the pith of the main s...
Technical Report
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In this report, we update the European Grassland Butterfly Indicator, present new butterfly indicators for widespread species, woodland butterflies, as well as butterflies in urban environments, in Natura 2000 areas and as climate change indicators. The indicators use field data up to and including the 2018 field season. The method for calculating...
Article
Full-text available
The article reports the AMS (accelerator mass spectrometry) radiocarbon dating results of the Livingstone Tree, a large African baobab on the right bank of the Zambezi, near Chiramba, Mozambique. In 1858, David Livingstone, who discovered the baobab, carved his monogram on the walls of its inner cavity. In 1996, the historic baobab was uprooted whe...
Book
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Din miile de fotografii pe care le-am realizat împreună cu echipa Societății Lepidopterologice Române, în ultimii ani, de când ne preocupă soarta sitului Dealurile Clujului de Est, am ales 150 de poze care surprind aspecte generale precum și particularitățile acestei arii naturale protejate, în speranța că vom reuși să vă convingem să veniți și să-...
Article
Full-text available
The volcanic Comoro Islands, located in the Indian Ocean in between mainland Africa and Madagascar, host several thousand African baobabs (Adansonia digitata). Most of them are found in Mayotte, which currently belongs to France, as an overseas department. These trees constiutute a reliable archive for climate change and millennial specimens were r...
Article
Full-text available
The volcanic Comoro Islands, located in the Indian Ocean in between mainland Africa and Madagascar, host several thousand African baobabs (Adansonia digitata). Most of them are found in Mayotte, which currently belongs to France, as an overseas department. We report the investigation of the largest two baobabs of Mayotte, the Big baobab of Musical...
Article
Full-text available
The article presents the radiocarbon investigation of the baobab of Jhunsi, Allahabad and the Parijaat tree at Kintoor, two old African baobabs from northern India. Several wood samples extracted from these baobabs were analysed by using AMS radiocarbon dating. The radiocarbon date of the oldest samples were 779 ± 41 BP for the baobab of Jhunsi and...
Article
Full-text available
Eriogaster catax and E. lanestris (Lepidoptera: Lasiocampidae) are two cohabiting species with extremely isolated populations. The anthropic impact lead to a decrease in their distributional areas, which led to the inclusion of E. catax in Annexes II and IV of the Council Directive 92/43/EEC. There are few studies regarding the species in question,...
Article
Full-text available
The article discloses the accelerator mass spectrometry (AMS) radiocarbon dating results of the Big Reniala of Isosa, which is a massive Grandidier baobab (Adansonia grandidieri Baill.) of Madagascar. The investigation of this baobab shows that it consists of 5 perfectly fused stems and exhibits a cluster structure. The calculated wood volume of th...
Article
Full-text available
Traditionally managed agricultural lands in Transylvania repeatedly presented a high biodiversity and valuable insect communities. On the other hand, intensified agricultural landscapes have been somewhat less analysed from the perspective of habitat cover and habitat heterogeneity in the same region. The aim of our study was to document the fauna...
Article
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The year 2016 witnessed the fall of a symbol of the botanical world: the historic Chapman baobab of Botswana. This article presents the results of our investigation of the standing and fallen tree. The Chapman baobab had an open ring-shaped structure composed of six partially fused stems. Several wood samples collected from the stems prior and afte...
Article
In agro-ecosystems, environmental monitoring is fundamental to detect and survey changes related to land use change and management practices. Butterflies and moths have often been suggested as suitable indicators for monitoring environmental effects on biodiversity in farmlands. Here, we estimated the required sample size and monitoring effort nece...
Article
Full-text available
Background Habitat quality is one main trigger for the persistence of butterflies. The effects of the influencing biotic and abiotic factors may be enhanced by the challenging conditions in high-alpine environments. To better our knowledge in this field, we performed a mark-release-recapture study with Boloria pales in the Southern Carpathians. Me...
Article
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Summary: Three individuals of Schrankia balneorum (Alphéraky, 1880) are reported for the first time in the Romanian fauna. The three specimens were collected from Stanca village, Iasi country, north-eastern Romania. Photos of the adults as well information about the biology and the distribution of the species are given.
Article
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The article reports the AMS (accelerator mass spectrometry) radiocarbon investigation results of the old common ash of Aiton. Five wood samples were collected from the trunk of the tree. The deepest ends of the samples were analysed by AMS radiocarbon. We found radiocarbon dates between 165 ± 20 BP and 240 ± 18 BP, which correspond to calibrated ag...
Poster
Full-text available
Panou informativ cu fluturi din Cheile Turenilor (Tureni Gorges-Butterflies and Moths)
Poster
Full-text available
Panou informativ cu flori din Cheile Turenilor (Tureni Gorges-Flowers)
Article
Full-text available
The African baobab is the biggest and longest-living angiosperm tree. By using radiocarbon dating we identified the stable architectures that enable baobabs to reach large sizes and great ages. We report that 9 of the 13 oldest and 5 of the 6 largest individuals have died, or at least their oldest parts/stems have collapsed and died, over the past...
Article
Full-text available
In Supplementary Table 1 originally published with this Brief Communication, the authors gave an incorrect GPS easterly coordinate for tree number 12 (Makulu Makete Big baobab); the coordinate '2° 34.584' S, 25° 52.261' E' should have read '22° 34.584' S, 28° 52.261' E'. This has now been amended in the online Supplementary Information file for thi...
Poster
Full-text available
Panou informativ cu flori din Cheile Turzii, Turda Gorges Flowers
Poster
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Panou informativ cu fluturi din Cheile Turzii, Turda Gorges Butterflies
Presentation
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Insect of the year 2018 in Romania and Moldova: Maculinea teleius
Article
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We investigated the systematics and biogeography of the West-Palaearctic water cricket genus Velia Latreille based on a phylogenetic analysis of five molecular markers obtained from 79% of all known taxa of the subgenera Velia (s. str.) and Velia (Plesiovelia) Tamanini. The results revealed a sister group relationship between Velia (Plesiovelia) an...
Article
Full-text available
Although Pilemia tigrina is a species of conservation concern, its biology, ecology and distribution in Romania are still poorly known. The data we are adding here contribute to complete the knowledge in the above-mentioned aspects. This is also the first time in 105 years (last known in 1912) that the authors recorded many new occurrences of this...
Article
Herbivores and their predators are affected by changes in land-use and habitat fragmentation. Past studies of tri-trophic herbivore communities have found that increasing land-use intensity leads to declines in community stability. The majority of these studies analysed community stability in highly fragmented ecosystems characterised by intensive...
Article
Full-text available
Here we report a number of species for the first time from various European countries. These are Erioptera (Erioptera) divisa (Walker, 1848) and E. (E.) lutea lutea (Meigen, 1804) from Greece; E. (E.) flavata (Westhoff, 1882) and E. (E.) griseipennis (Meigen, 1838) from Bosnia and Herzegovina; E. (E.) fusculenta (Edwards, 1938) from Austria, Monten...
Article
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The aim of our study is to evaluate the abundance of melanic forms of Biston betularia in the year 2012 from the Copșa Mică area. This locality is well known for the high pollution level caused by the synergic action of SO2, soot black and heavy metals. The two industrial units, which were the pollution sources were closed and the now the pollution...
Article
Full-text available
The article discloses the main results of our new investigation of Platland tree, a.k.a. Sunland baobab, the largest known African baobab. Our recent research was motivated by the three successive splits of 2016 and 2017, which determined the collapse and demise of the stems that have built the main unit of the tree. According to our new findings c...
Article
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Conservation programmes are often based on snapshot information on animal abundance. However, land fragments with high numbers of individuals do not necessarily represent their natal areas, which are crucial for species persistence. A classic example of the above principle are source-sink systems, in which excess individuals emigrate from source ar...
Article
Full-text available
Demographic parameters such as survival, sex ratio and abundance can profoundly affect the viability of populations and thus are of primary importance in species of conservation concern. Although numerous studies have been published on certain aspects of the ecology and evolution of the endangered Large Blue butterfly Maculinea arion, there is stil...
Article
Full-text available
Morphometrics have had many uses in various fields of science. A modern trend of focusing on molecular data in biology might overlook the importance that morphometrics have had, and can have, in scientific experiments. The purpose of this paper is to illustrate the utility of geometric and linear morphometrics both in previous research and in a stu...
Article
Full-text available
Studies investigating host-parasite systems rarely deal with multispecies interactions, and mostly explore impacts on hosts as individuals. Much less is known about the effects at colony level, when parasitism involves host organisms that form societies. We surveyed the effect of an ectoparasitic fungus, Rickia wasmannii, on kin-discrimination abil...
Conference Paper
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In order to advance long-term sustainable development of land use systems against risks arising from multiple aspects of global change STACCATO plans to quantify the sensitivity of ecosystem functions (ESF) and the services (ESS) to environmental pressures in representative agriculturally dominated landscapes in Europe. The focus is on local as wel...
Article
The article reports the growth stop phenomenon, which was documented only for baobabs, i.e. for trees belonging to the Adansonia genus. The identification of growth stop was enabled by radiocarbon dating, which allows a complex investigation of samples collected from the trunk/stems of baobabs. In several cases, the outermost rings of baobabs, whic...
Presentation
Abandoned lands provide interesting case studies for ecological theory, but may also lead to challenges in the practical ecological restoration. Thus, understanding the development of communities on abandoned lands is important from many perspectives. Eastern European socio-economic and political changes that occurred after the breakdown of sociali...
Article
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Hay is still a fundamental resource for many Central and Eastern European traditional rural communities, as this is the only type of fodder used in winter time for the indoor feeding of livestock animals. To explore its current relevance for local communities, we conducted research in Ieud village, Maramureș county, in Northern Romania. The fourtee...
Article
Full-text available
Various traditional agricultural practices have shaped the grassland habitats of Europe for centuries. Intensification and abandonment in western European countries have led to a steep decline in biodiversity. In this study we use two groups of insects, considered good indicators of habitat quality, to assess the biodiversity in mesophilous grassla...
Article
Full-text available
Different types of land use have determined the biodiversity of seminatural grassland habitats in whole Europe. In Central and Western European lands a large decline in grassland biodiversity has been recorded due to intensifica-tion and abandonment of traditional agricultural practices. Presently in Romania, most grasslands are classified as high...
Article
Full-text available
When selecting specific host plants, caterpillars of many lycaenid butterflies, such as the protected Pseudophilotes bavius hungarica, are known to engage in various interactions with ants, which help them survive. Although P. bavius is a protected species, data about its host plant selection is very scarce, and little information is available on i...
Presentation
Full-text available
Field Site selection for STACCATO project (study case Romania/Cluj county)