291. Finding a largest-area triangle in a terrain in near-linear timeSergio Cabello, Arun Kumar Das, Sandip Das, Joydeep Mukherjee, 2025, original scientific article Abstract: A terrain is an x-monotone polygon whose lower boundary is a single line segment. We present an algorithm to find in a terrain a triangle of largest area in O(nlogn) time, where n is the number of vertices defining the terrain. The best previous algorithm for this problem has a running time of O(n2).
Keywords: terrain, inclusion problem, geometric optimisation, hereditary segment tree
Published in DiRROS: 12.03.2025; Views: 152; Downloads: 96
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292. Nest survival of great tit Parus major in spatial and temporal gradientDejan Bordjan, Davorin Tome, 2013, original scientific article Abstract: The aim of the study was to compare nest survival of Great Tit between different regions, altitudes and years to discern which has the highest influence. Temperature is known to be prominent for breeding parameters and it changes consistently with altitude. Our hypothesis was that altitude has greater influence on nest survival than the region and year. Breeding parameters were monitored with the use of nestboxes over a three year period at three altitude belts in two regions. The main factor influencing nesting success was modelled using daily survival rate in the program MARK. We gathered data from 104 first nesting attempts of which 26 failed. Although nest failure increased with altitude this was significant only for one region. There was significant difference in nest failure between the regions but not between the years. Modelling showed higher support in data for regions than for altitudes and years thus rejecting the hypothesis. Some possible reasons for such results are discussed.
Keywords: great tit, nest survival, altitude
Published in DiRROS: 12.03.2025; Views: 99; Downloads: 85
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293. Orodja za delo z delotokiMarko Vidak, Bojan Kverh, Polonca Ferk, Branimir Leskošek, Maja Zagorščak, Nadja Francesca Nolte, Carissa Bleker, Marko Petek, Anže Županič, 2024, other monographs and other completed works Keywords: odprti podatki, odprta znanost, delo z delotoki, projekt Spoznaj, okolje Galaxy, raziskovalni podatki, uporabljanje podatkov
Published in DiRROS: 12.03.2025; Views: 165; Downloads: 52
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294. Nestling growth of great tits Parus major with comparison among altitudesDejan Bordjan, 2013, original scientific article Abstract: : Fledgling mass can have great influence on individual’s life history and reflects the availability and quality of food in the breeding territory. Thus growth curve is used to compare the difference in the quality between different ecological conditions. The aim of the study was to fill the knowledge gap on nestling growth in Great Tit in Slovenia, to determine the influence of altitude on it and to present a tool for estimating age of nestlings and key dates in breeding phenology of Great Tit. Great Tits young were monitored using nest-boxes at three locations between years 2010 and 2012. At two locations nest-boxes were placed on three separate altitudinal belts. Weight growth curve was compared with the curves from other parts of Europe. Growth curve from Slovenia differs in growth parameters from other European populations but falls within their range. Difference in growth parameters between separate populations probably comes from the difference in ecological conditions. When comparing three altitudes weight parameters of hatchlings were similar at lower and middle but different at upper altitudes indicating that weigh growth changes with the altitude. Lower food abundance that comes with rising altitude may be offset by lower competition through lower breeding density (hence similar growth parameters in lower and middle altitude), but not past certain altitude. Weight parameters are useful when comparing different populations, but wing-length is better in determining the age of young in the nest
Keywords: great tit, hatchling growth, altitude
Published in DiRROS: 12.03.2025; Views: 127; Downloads: 55
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295. Ponovna uporaba raziskovalnih podatkovBranimir Leskošek, Marko Vidak, Bojan Kverh, Polonca Ferk, 2024, other monographs and other completed works Keywords: odprti podatki, odprta znanost, institucionalni repozitoriji, projekt Spoznaj, načela odprte znanosti, raziskovalni podatki, uporabljanje podatkov
Published in DiRROS: 12.03.2025; Views: 166; Downloads: 56
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296. Palomena prasina (Hemiptera: Pentatomidae) vibratory signals and their tuning with plant substratesJernej Polajnar, Andreja Kavčič, Alenka Žunič Kosi, Andrej Čokl, 2013, original scientific article Abstract: Palomena prasina is interesting for the study of vibrational communication within the Pentatomid subfamily Pentatominae, because its host range is limited to woody plants, unlike the better known Nezara viridula, whose vibrational communication is commonly used as a model for the whole family. The vibrational repertoire of P. prasina was described several decades ago and is redescribed in this paper using modern methods for non-contact vibration recording. Additionally, we hypothesized that this species has retained the capacity for signal frequency variation necessary for tuning to resonance properties of various host plants of Pentatominae, but if the signals are emited in the absence of mechanical feedback, they are tuned more specifically to their native acoustic environment – woody plants. By recording live bugs signalling on different substrates and comparing spectral properties of their signals among substrates, we found that there is a match between the signals emitted on a woody branch and those emitted on a non-resonant surface, while spectral properties of signals emitted on herbaceous plants differ. Our findings provide evidence in support of the signal tuning hypothesis and shed further light on the crucial role of substrate in vibrational communication of insects.
Keywords: vibrational communication, signal propagation, frequency characteristics
Published in DiRROS: 12.03.2025; Views: 101; Downloads: 57
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297. Multiple glacial refugia of the low-dispersal ground beetle Carabus irregularis : molecular data support predictions of species distribution modelsKatharina Homburg, Claudia Drees, Martin M. Gossner, Laszlo Rakosy, Al Vrezec, Thorsten Assmann, 2013, original scientific article Abstract: Classical glacial refugia such as the southern European peninsulas were important for species survival during glacial periods and acted as sources of post-glacial colonisation processes. Only recently, some studies have provided evidence for glacial refugia north of the southern European peninsulas. In the present study, we combined species distribution models (SDMs) with phylogeographic analyses (using mitochondrial DNA = mtDNA) to investigate if the cold-adapted, stenotopic and flightless ground beetle species, Carabus irregularis, survived the Last Glacial Maximum (LGM) in classical and/or other refugia. SDMs (for both a western European and for a Carpathian subgroup) were calculated with MAXENT on the basis of 645 species records to predict current and past distribution patterns. Two mtDNA loci (CO1 and ND5, concatenated sequence length: 1785 bp) were analyzed from 91 C. irregularis specimens to reconstruct the phylogeography of Central and eastern European populations and to estimate divergence times of the given lineages. Strong intra-specific genetic differentiation (inter-clade ΦST values ranged from 0.92 to 0.99) implied long-term isolation of major clades and subsclades. The high divergence between the nominate subspecies and the Carpathian subspecies C. i. montandoni points to two independent species rather than subspecies (K-2P distance 0.042 ± 0.004; supposed divergence of the maternal lineages dated back 1.6 to 2.5 million years BP) differing not only morphologically but also genetically and ecologically from each other. The SDMs also inferred classical as well as other refugia for C. irregularis, especially north of the Alps, in southeastern Europe and in the Carpathians. The coincidences between the results of both methods confirm the assumption of multiple glacial refugia for the studied species and the usefulness of combining methodological approaches for the understanding of the history of low-dispersal insect species.
Keywords: ecology, phylogeny, zoogeograpy
Published in DiRROS: 12.03.2025; Views: 154; Downloads: 80
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298. Percussion signals of Lygus rugulipennis Poppius (Heteroptera: Miridae)Sándor Koczor, Andrej Čokl, 2014, original scientific article Abstract: The European tarnished plant bug (Lygus rugulipennis Poppius) is among the most serious pests in the family Miridae, and therefore there is increasing interest in understanding the behaviour of this species. In the present study, laboratory recordings were taken using a laser vibrometer on adult males and females to ascertain whether acoustic signals are involved in intraspecific communication. Recordings were both carried out on plant and loudspeaker membrane substrates. Males and females emitted vibratory signals and the present results indicate that these signals are important during courtship. The basic signal characteristics measured were the dominant frequency, pulse duration, repetition time and number of pulses per group within the signal. Male and female signals did not differ in respect to any of these characteristics. Plant recorded signals were longer because of different mechanical properties of substrates. Additionally, the high frequency components were attenuated due to the low-pass filtering properties of plants. As this is the first study on vibratory communication of the European tarnished plant bug, we believe these findings may contribute considerably to the better understanding of the mating behavior of this important pest species.
Keywords: European tarnished plant bug, acoustic communication, laser vibrometer, plant, substrate, loudspeaker membrane
Published in DiRROS: 12.03.2025; Views: 117; Downloads: 78
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299. The role of signals of different modalities in initiating vibratory communication in Nezara viridulaVera Zgonik, Andrej Čokl, 2014, original scientific article Abstract: Signals of different modalities are involved in the behaviour of the green stink bug, Nezara viridula (L.) (Pentatomidae, Heteroptera). Long range attraction is mediated by male pheromones, resulting in aggregation of bugs on the same plant where vibratory signals, vision and various chemical signals become important. Both males and females sing spontaneously. When both are on the plant, males start vibratory communication as often as females. Females induce the exchange of vibratory signals spontaneously or triggered by the male pheromone while males initiate the duet either spontaneously or after seeing the female. Males and females sing spontaneously and respond to signals of different modalities more often in the daylight than in the dark. Long lasting autonomous emission of the female calling song is present when triggered by the male pheromone and males respond to female calling predominantly by the emission of the courtship song.
Keywords: mating behaviour, animal communication, vibrations, green stink bug
Published in DiRROS: 12.03.2025; Views: 122; Downloads: 125
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