Vojtech Novotny

Vojtech Novotny
The Czech Academy of Sciences | AVCR · Department of Ecology and Conservation Biology

PhD

About

259
Publications
111,960
Reads
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11,933
Citations
Additional affiliations
January 1990 - present
Biology Centre, Czech Academy of Sciences
Position
  • Head of Department

Publications

Publications (259)
Article
Piper aduncum, a tree species native to the Neotropics, has been introduced to other tropical regions and successfully invades secondary forest in fallow land after small scale slash-and-burn agriculture in Papua New Guinea (PNG). However, the effect of P. aduncum invasion on soil chemical properties as well as soil biota remains poorly understood....
Article
This study aims to analyze the occurrence and composition of ferns along an elevational gradient and among different forest types and disturbance regimes in Papua New Guinea (PNG). The assessment was conducted using the monitoring protocol of the National Forest Inventory. The investigation revealed a high richness of ferns, with 122 species or mor...
Research Proposal
Full-text available
We are looking for an enthusiastic candidate to join a project exploring plant-insect food webs in tropical rainforests in Papua New Guinea, using manipulative experiments with entire communities. A successful candidate has • a MSc degree (non-negotiable requirement for the PhD programme) • serious interest in the ecology of insects and/or plants •...
Article
Full-text available
Reproductive isolation in response to divergent selection is often mediated via third‐party interactions. Under these conditions, speciation is inextricably linked to ecological context. We present a novel framework for understanding arthropod speciation as mediated by Wolbachia, a microbial endosymbiont capable of causing host cytoplasmic incompat...
Article
Full-text available
Trees can emit volatile organic compounds (VOCs) when under attack by herbivores, and these signals can also be detected by natural enemies and neighbouring trees. There is still limited knowledge of intra- and inter-specific communication in diverse habitats. We studied the effects of induced VOC emissions by three Ficus species on predation on th...
Article
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As the major group of herbivorous insects, moths are highly significant in natural ecosystems. In collaboration with the Papua New Guinea (PNG) multipurpose National Forest Inventory (NFI) survey, this study investigates the species richness, distribution and community composition of Geometrid moths (Lepidoptera) in PNG’s tropical forests and analy...
Article
Current climate change is disrupting biotic interactions and eroding biodiversity worldwide. However, species sensitive to aridity, high temperatures and climate variability might find shelter in microclimatic refuges, such as leaf rolls built by arthropods. To explore how the importance of leaf shelters for terrestrial arthropods changes with lati...
Article
Full-text available
The relative roles of plants competing for resources versus top‐down control of vegetation by herbivores, in turn impacted by predators, during early stages of tropical forest succession remain poorly understood. Here we examine the impact of insectivorous birds, bats and ants exclusion on arthropods communities on replicated 5x5 m of pioneering ea...
Article
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Tree size shapes forest carbon dynamics and determines how trees interact with their environment, including a changing climate. Here, we conduct the first global analysis of among‐site differences in how aboveground biomass stocks and fluxes are distributed with tree size. We analyzed repeat tree censuses from 25 large‐scale (4–52 ha) forest plots...
Preprint
Over the past decades, elevational gradients have become a powerful tool with which to understand the underlying cause(s) of biodiversity. The Mt. Wilhelm elevational transect is one such example, having been used to study the birds, insects, and plants of Papua New Guinea (PNG). However, a survey of mammals from this forest elevational transect wa...
Article
Syzygium is the largest woody genus of flowering plants in the world and one of the most important components of the forest vegetation in Papua New Guinea (PNG). Although the systematics of the genus is improving, a comprehensive appraisal of the environmental features and gradients of its species is still lacking. Our work aims to fill this gap by...
Article
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The construction of shelters on plants by arthropods might influence other organisms via changes in colonization, community richness, species composition and functionality. Arthropods, including beetles, caterpillars, sawflies, spiders, and wasps often interact with host plants via the construction of shelters, building a variety of structures such...
Article
National Forest Inventory (NFI) protocols have traditionally been designed to assess land coverage and the production value of forest. We propose that this approach needs to evolve toward multipurpose resource survey with broader scope, including data on plant and animal biodiversity, forest carbon pools, and carbon sequestration, given the role of...
Article
Full-text available
Bats represent an important, but poorly known component of mammal diversity in Papua New Guinea (PNG). Our surveys in two altitudinal rainforest gradients recorded 43 bat species of which six ( Dobsonia minor , D. praedatrix , Hipposideros calcaratus , H. maggietaylorae , Miniopterus australis , Miniopterus sp.) fell outside of their known altitudi...
Article
Full-text available
Previous studies have provided important scientific information on ant species richness and composition relating to the effects of elevation, sampling approaches, stratification, and forest succession. Yet, they have primarily focused on single sites or regions. Knowledge of ant ecology should also include the impact of disturbance in various fores...
Preprint
Full-text available
The Nature Index and the Web of Science databases are used to analyse the publication patterns in life sciences in Papua New Guinea, aiming to identify the ways of improving research output of the country.
Presentation
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New Guinea Binatang Research Center: report in activities in 2020
Presentation
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Pictorial report on the conservation and biodiversity research along the Mt. Wilhelm ekevation rainforest gradient by the New Guinea Binatang Research Center.
Article
In the tropics, antagonistic seed predation networks may have different properties than mutualistic pollination and seed dispersal networks, but the former have been considerably less studied. We tested whether the structure of antagonistic tripartite networks composed of host plants, insects developing within seeds and fruits, and their insect par...
Article
Understanding spatiotemporal trends on insect-plant interaction networks is essential to unveil the ecological and evolutionary processes driving herbivore specialisation. However, community studies accounting for temporal dynamics in host-plant specialisation of herbivorous insects are surprisingly scarce. Here, we investigated how seasonality aff...
Article
The community composition of insect herbivores is largely shaped by host–plant phylogeny and functional traits. These effects differ between herbivores due at least in part to varying levels of diet specialisation. Distinguishing between herbivores with differing specialisation is therefore necessary to understand the roles of host phylogeny and tr...
Article
Full-text available
Elucidating dynamics of soil microbial communities after disturbance is crucial for understanding ecosystem restoration and sustainability. However, despite the widespread practice of swidden agriculture in tropical forests, knowledge about microbial community succession in this system is limited. Here, amplicon sequencing was used to investigate e...
Article
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Papua New Guinea is home to >10% of the world’s languages and rich and varied biocultural knowledge, but the future of this diversity remains unclear. We measured language skills of 6,190 students speaking 392 languages (5.5% of the global total) and modeled their future trends using individual-level variables characterizing family language use, so...
Article
Full-text available
Arbuscular mycorrhizal (AM) and ectomycorrhizal (EcM) associations are critical for host-tree performance. However, how mycorrhizal associations correlate with the latitudinal tree beta-diversity remains untested. Using a global dataset of 45 forest plots representing 2,804,270 trees across 3840 species, we test how AM and EcM trees contribute to t...
Article
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While there are numerous studies of diversity patterns both within local communities and at regional scales, the intermediate scale of tens to thousands of km2 is often neglected. Here we present detailed local data on plant communities (using 20×20 m plots) and bird communities (using point counts) for a 50 ha ForestGEO plot in lowland rainforest...
Article
Full-text available
Tropical forests are notable for their high species diversity, even on small spatial scales, and right-skewed species and size abundance distributions. The role of individual species as drivers of the spatial organization of diversity in these forests has been explained by several hypotheses and processes, for example, stochastic dilution, negative...
Article
Full-text available
Microbial interconnections in soil are pivotal to ecosystem services and restoration. However, little is known about how soil microbial interconnections respond to slash-and-burn agriculture and to the subsequent ecosystem restoration after the practice. Here, we used amplicon sequencing and co-occurrence network analyses to explore the interconnec...
Preprint
Full-text available
Papua New Guinea is home to >10% of the world’s languages and rich and varied biocultural knowledge, but the future of this diversity remains unclear. We measured language skills of 6,190 students speaking 392 languages (5.5% of the global total) and modelled their future trends, using individual-level variables characterizing family language use,...
Article
Full-text available
The ant mosaic is a concept of the non-random spatial distribution of individual ant species in trees built upon the assumption of interspecific behavioural associations. However, colony identity and environmental variance may also play a role in species distribution. Here we assess the presence of ant mosaics in a primary forest ecosystem and whet...
Preprint
Full-text available
Barriers to gene-flow within populations, typically in response to divergent selection, are often mediated via third-party interactions. Under these conditions speciation is inextricably linked to ecological context. We present a novel framework for studying arthropod speciation as mediated by Wolbachia , a microbial endosymbiont capable of causing...
Preprint
Full-text available
Barriers to gene-flow within populations, typically in response to divergent selection, are often mediated via third-party interactions. Under these conditions speciation is inextricably linked to ecological context. We present a novel framework for studying arthropod speciation as mediated by Wolbachia , a microbial endosymbiont capable of causing...
Preprint
Full-text available
Barriers to gene-flow within populations, typically in response to divergent selection, are often mediated via third-party interactions. Under these conditions speciation is inextricably linked to ecological context. We present a novel framework for studying arthropod speciation as mediated by Wolbachia, a microbial endosymbiont capable of causing...
Article
Full-text available
Tropical mountains encompass a wide range of environmental conditions and are useful models for studying drivers of community structure. Invertebrate species richness and abundance show various elevational patterns. However, the drivers of these differences are not well understood, although microhabitat complexity is potentially important. We studi...
Article
Host-specific natural enemies limit the abundance of common species. This can increase host community diversity, since no single species dominates, and is known as the ‘Janzen-Connell effect.’ Evidence is now accumulating that host-specific mutualists can increase abundances of particular host species, hence reducing community diversity, comprising...
Article
Context Swidden agriculture (a type of small-scale agriculture) is crucial to the livelihood and food security of millions of people in tropical regions. Social-ecological changes, including population growth and anti-swidden policies, are putting pressure on the existing swidden system to increase agricultural productivity in a sustainable way. En...
Preprint
Current climate change is disrupting biotic interactions and eroding biodiversity worldwide. However, species sensitive to drought, high temperatures and climate variability might persist in microclimatic refuges, such as leaf shelters built by arthropods. We conducted a distributed experiment across an 11,790 km latitudinal gradient to explore how...
Article
Full-text available
High‐throughput sequencing (HTS) is increasingly being used for the characterisation and monitoring of biodiversity. If applied in a structured way, across broad geographic scales, it offers the potential for a much deeper understanding of global biodiversity through the integration of massive quantities of molecular inventory data generated indepe...
Article
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ForestGEO is a network of scientists and long-term forest dynamics plots (FDPs) spanning the Earth's major forest types. ForestGEO's mission is to advance understanding of the diversity and dynamics of forests and to strengthen global capacity for forest science research. ForestGEO is unique among forest plot networks in its large-scale plot dimens...
Article
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1. Assemblages of insect herbivores are structured by plant traits such as nutrient content, secondary metabolites, physical traits, and phenology. Many of these traits are phylogenetically conserved, implying a decrease in trait similarity with increasing phylogenetic distance of the host plant taxa. Thus, a metric of phylogenetic distances and re...
Preprint
Full-text available
1. Assemblages of insect herbivores are structured by plant traits such as nutrient content, secondary metabolites, physical traits, and phenology.
Article
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• Papua New Guinea (PNG) has the greatest diversity of dacine fruit fly species (Diptera: Tephritidae: Dacinae) in the world, many of which are significant agricultural pests. • Although their taxonomy is relatively well known, there is limited research on their geographical and elevational distribution. • We undertook a survey of PNG's fruit fly f...
Article
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The SURFACES project is integrating action on good health and wellbeing [Sustainable Development Goal (SDG) 3] and conservation of life on land (SDG 15) in the threatened rainforests of Papua New Guinea (PNG), and mapping evidence of similar projects worldwide. Our approach is framed by Planetary Health, aiming to safeguard both human health and th...
Article
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Introduction Our project follows community requests for health service incorporation into conservation collaborations in the rainforests of Papua New Guinea (PNG). This protocol is for health needs assessments, our first step in coplanning medical provision in communities with no existing health data. Methods and analysis The study includes clinic...
Article
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In arthropod community ecology, species richness studies tend to be prioritised over those investigating patterns of abundance. Consequently, the biotic and abiotic drivers of arboreal arthropod abundance are still relatively poorly known. In this cross-continental study, we employ a theoretical framework in order to examine patterns of covariance...
Article
Full-text available
New Guinea has the world’s richest island flora, according to the area’s first plant list catalogued by experts. Completing this list poses a formidable challenge that New Guineans are best placed to take up. New Guinea has the world’s richest island flora.
Article
Full-text available
Elevational gradients affect the production of plant secondary metabolites through changes in both biotic and abiotic conditions. Previous studies have suggested both elevational increases and decreases in host-plant chemical defences. We analysed the correlation of alkaloids and polyphenols with elevation in a community of nine Ficus species along...
Article
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The fig (Moraceae) and pollinating fig wasp (Agaonidae) mutualism is best known as a model system for the study of coevolution in plant–pollinator interactions and its central role in shaping vertebrate communities in tropical forests. Figs also host myriad antagonistic parasitic fig wasps which impose costs on both partners threatening mutualism s...
Article
Full-text available
1. There is growing evidence that top-down biotic factors play an important role in plant community dynamics and are able to maintain the high plant diversity of primary tropical forests. However, the top-down impact by herbivores on the accumulation of plant biomass, richness, and the community assembly process remains poorly known for the initial...
Article
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Vertical niche partitioning might be one of the main driving forces explaining the high diversity of forest ecosystems. However, the forest's vertical dimension has received limited investigation, especially in temperate forests. Thus, our knowledge about how communities are vertically structured remains limited for temperate forest ecosystems. In...
Article
The structure of ecological networks reflects the evolutionary history of their biotic components, and their dynamics are strongly driven by ecoevolutionary processes. Here, we present an appraisal of recent relevant research, in which the pervasive role of evolution within ecological networks is manifest. Although evolutionary processes are most e...
Article
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Klimatická Proč by se lidstvo nemělo soustředit jen na klimatickou změnu a k čemu potřebujeme "ekologický program Apollo"? Prof. RNDr. VOJTĚCH NOVOTNÝ (55), CSc., který se specializuje na ekologii tropického hmyzu, osvětluje "šesté vymírání druhů" a čeho se doopravdy bát při ohřívání rovníkových nížin. Jak souvisí komunismus s klimatickou revolucí?...
Article
Full-text available
Classic research on elevational gradients in plant–herbivore interactions holds that insect herbivore pressure is stronger under warmer climates of low elevations. However, recent work has questioned this paradigm, arguing that it oversimplifies the ecological complexity in which plant–insect herbivore interactions are embedded. Knowledge of antago...
Article
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The extreme biological diversity of Oceanian archipelagos has long stimulated research in ecology and evolution. However, parasitic protists in this geographic area remained neglected and no molecular analyses have been carried out to understand the evolutionary patterns and relationships with their hosts. Papua New Guinea (PNG) is a biodiversity h...
Article
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Declines or mid-elevation peaks in invertebrate diversity with elevation are often attributed to climate and geometric constraints. However, vegetation structure may also drive diversity patterns, especially for tree-dwelling species, via its effects on microhabi-tat use and competitive interactions. Here we investigate these effects on the diversi...
Article
Full-text available
Invertebrate predators and parasitoids are among the most important natural enemies of insect herbivores. Yet, the strength of natural enemy pressure along an altitudinal gradient and interactions between the groups of natural enemies (such as predation on parasitized prey) are not well known. Various methods are used to reveal the mortality factor...