Yoko L Dupont

Yoko L Dupont
Aarhus University | AU · Department of Bioscience

About

79
Publications
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4,271
Citations
Citations since 2017
28 Research Items
2433 Citations
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20172018201920202021202220230100200300400500
20172018201920202021202220230100200300400500
20172018201920202021202220230100200300400500

Publications

Publications (79)
Preprint
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As the globe becomes more urban, the question how much natural biodiversity can subsist in cities becomes increasingly urgent to answer, and also how is urban diversity structured? To contribute to an answer, we studied the metacommunity of bees in a North European metropolitan area. The system consisted of 13 sites in the city of Aarhus, Denmark,...
Article
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Understanding how niche-based and neutral processes contribute to the spatial variation in plant-pollinator interactions is central to designing effective pollination conservation schemes. Such schemes are needed to reverse declines of wild bees and other pollinating insects, and to promote pollination services to wild and cultivated plants. We use...
Article
Full-text available
Honey bees are key insect pollinators, providing important economic and ecological value for human beings and ecosystems. This has triggered the development of several monitoring methods for assessing the temporal development of colony size, food storage, brood and pathogens. Nonetheless, most of these methods are based on visual assessments that a...
Article
Recent decades have seen a surge in awareness about insect pollinator declines. Social bees receive the most attention, but most flower-visiting species are lesser known, non-bee insects. Nocturnal flower visitors, e.g. moths, are especially difficult to observe and largely ignored in pollination studies. Clearly, achieving balanced monitoring of a...
Article
Seventy five percent of the world's food crops benefit from insect pollination. Hence, there has been increased interest in how global change drivers impact this critical ecosystem service. Because standardized data on crop pollination are rarely available, we are limited in our capacity to understand the variation in pollination benefits to crop y...
Article
Full-text available
1. Predicting plant‐pollinator interaction networks over space and time will improve our understanding of how environmental change is likely to impact the functioning of ecosystems. Here we propose a framework for producing spatially explicit predictions of the occurrence and number of pairwise plant‐pollinator interactions and of the species richn...
Article
Full-text available
As part of the MUST-B project, a research project on field data collection for honey bee colony model evaluation was carried out in 2018-2020. In a preparatory phase (2018), methods for monitoring of honey bee colonies were tested, field operators trained, and experimental colonies established. The main field experiment was conducted in 2019-2020,...
Article
Full-text available
A recurrent concern in nature conservation is the potential competition for forage plants between wild bees and managed honey bees. Specifically, that the highly sophisticated system of recruitment and large perennial colonies of honey bees quickly exhaust forage resources leading to the local extirpation of wild bees. However, different species of...
Article
Med et insekthotel i haven kan du tilbyde en bolig til de trængte vilde bier og få hjælp til bestøvning af frugttræer, buske og havens blomstrende urter. Læs her om dem, der typisk vil indlogere sig på insekthotellet.
Article
Recent studies have shown that sub-lethal doses of herbicides may affect plant flowering, however, no study has established a direct relationship between the concentrations of deposited herbicide and plant flowering. Here the aim was to investigate the relationship between herbicide spray drift deposited on non-target plants and plant flowering in...
Technical Report
Full-text available
Vilde bestøvende insekter er generelt truede. De vilde bier, dagsommerfugle og svirrefluer, som denne rapport har fokus på, stiller imidlertid forskellige krav til levestedet gennem forskellige dele af livscyklus. I rapporten er levestedskravene eller habitatressourcerne, som de også kaldes, grundigt beskrevet for humlebier, enlige bier, dagsommerf...
Article
Intensively managed grasslands, typically containing a few high-yielding species, play a key role in providing biomass feedstock for animal feed and bioenergy production. However, these grasslands often contain few resources for flower-visiting insects, which provide pollination services for crops. In this study, we investigate if both high yield a...
Article
Understanding interactions between individual animals and their resources is fundamental to ecology. Agent-Based Models (ABMs) offer an opportunity to study how individuals move given the spatial distribution and characteristics of their resources. When contrasted with empirical individual-resource network data, ABMs can be a powerful method to det...
Article
Full-text available
The socioeconomically important fruit tree Parkia biglobosa is becoming less abundant in the West African savannah, possibly due to poor regeneration. This decline can be self-enforcing if lower densities of fertile trees result in increasing self-pollination followed by increased abortion rates or poor regeneration due to inbreeding depression. He...
Article
Full-text available
VILD CAMPUS ER ET FORMIDLINGSPROJEKT, DER I 2015 ETABLEREDE FIRE NATURHAVER TILPLANTET MED VILDE, DANSKE PLANTER I UNIVERSITETSPARKEN I KØBENHAVN. TO ÅR SENERE SUMMEDE PARKEN MED LIV FRA DE 48 ARTER AF VILDE BIER, DER I ET SPECIALEPROJEKT BLEV FUNDET I NATURHAVERNE.
Article
Herbicides and nitrogen fertilizers are widely used in intensively grown agricultural areas. Non-target plants growing in habitats adjacent to conventional fields may be exposed to herbicides by spray drift and misplacement of nitrogen fertilizers. Whereas sub-lethal effects of herbicides have previously been documented, combined effects of nitroge...
Article
Full-text available
Vilde bier er ikke kun de tykke, pelsede humlebier, som flittigt brummer rundt mellem havens blomster. Langt de fleste arter af vilde bier er små, diskrete insekter. Modsat de kolonilevende humlebier er de fleste vilde bier enlige, dvs. hver enkelt hun har sin egen husholdning, hvor hun bygger sin egen rede, som hun provi-anterer og laegger aeg i u...
Article
Full-text available
Shea (Vitellaria paradoxa) is an important fruit tree in West African parklands, and its successful pollination is a requirement for fruit production. Size-based pollinator exclusion experiments combined with visual observations showed that presence of honey bees (Apis mellifera jemenitica) was important for pollination and thereby the production o...
Chapter
Over the past decades declining biodiversity has been a major concern across the world; however, preventing biodiversity declines in agricultural areas has been ineffective. Failure to adequately assess and properly regulate herbicide effects can have important implications for species richness and overall biodiversity within natural and semi-natur...
Article
Full-text available
Abstract—One of the socio-economically important West African parkland trees, Parkia biglobosa yields pods consumed by people and animals. Being animal-pollinated, it is unknown how climate change will affect the species if the guild of pollinators changes. Here, we compare the pollinator guilds and the pod production at two climatically different...
Article
Full-text available
8 H umlebierne er nogle af vores mest iøjnefaldende og almindelige vilde bier. Selvom de ikke så godt kan lide at blive våde, er de ret robuste og er godt tilpassede vores kølige, nordiske klima med deres tykke pels. Laenge før andre insekter vågner op til dåd, kan man høre humlebierne arbejde i en kølig morgenstund – eller sent om aftenen. Om forå...
Article
The influence of space on the structure (e.g. modularity) of complex ecological networks remains largely unknown. Here, we sampled an individual-based plant–pollinator network by following the movements and flower visits of marked bumblebee individuals within a population of thistle plants for which the identities and spatial locations of stems wer...
Article
Full-text available
Most ecological networks are analysed as static structures, where all observed species and links are present simultaneously. However, this is over-simplified, because networks are temporally dynamical. We resolved an arctic, entire-season plant-flower visitor network into a temporal series of 1-day networks and compared the properties with its stat...
Article
Adult body mass is a strong correlate of many important life history traits of bees, and thus, has been used as a proxy for these traits in ecological studies. However, body mass is difficult to measure on live specimens in the field, and impossible to measure non-destructively on dry museum specimens. For worker and male bumblebees, we evaluated t...
Article
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Article
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Biodiversity is organised into complex ecological networks of interacting species in local ecosystems, but our knowledge about the effects of habitat fragmentation on such systems remains limited. We consider the effects of this key driver of both local and global change on both mutualistic and antagonistic systems at different levels of biological...
Article
Modularity is a structural property of ecological networks, which has received much interest, but has been poorly explored. Modules are distinct subsets of species interacting strongly with each other, but sparsely with species outside the subset. Using a series of temporal cumulative networks, we investigated the stability of modular organization...
Article
Full-text available
A longstanding hypothesis (“Baker's rule”) is that plant invasiveness is facilitated by floral self compatibility rather than self incompatibility. Extending this idea, invasive species whose individuals vary in degree of self compatibility within the native range might be self compatible in invading or weedy populations, due to natural selection o...
Chapter
Full-text available
By far, most studies in ecology are about single species and their interactions with the surroundings, and this is also true in pollination ecology. However, species are members of communities of interacting species, i.e. networks. According to our definition, a network only includes species, whose linkage is spatially unconstrained, i.e. species m...
Article
Full-text available
In this paper, we develop a method, termed the Interaction Distribution (ID) method, for analysis of quantitative ecological network data. In many cases, quantitative network data sets are under-sampled, i.e. many interactions are poorly sampled or remain unobserved. Hence, the output of statistical analyses may fail to differentiate between patter...
Data
Regional differences in species composition of bumblebee assemblages at present. Total numbers of bumblebees observed in Jutland and Funen in the present study. (DOC)
Data
Within-field differences in species composition of bumblebee assemblages at present. Total numbers of bumblebees observed in sub-plots at the edge, middle and center of the red clover fields in the present study. (DOC)
Data
Distributions of observed and expected abundances of bumblebees. Histograms of observed abundances of bumblebees (m−2) in mid season compared to the expected abundances under the assumption that data are exponential distributed. The same plots for early and late seasons were qualitatively similar. (EPS)
Data
Within-field differences in bumblebee abundances at present. Spatial differences in bumblebee abundances in sub-plots at the edge (light grey) middle (dark grey) and center (black) within fields. Likelihood ratio test of the effect of subplot: ** P<0.001. (EPS)
Data
Regional differences in bumblebee abundances at present. Regional differences in bumblebee abundances between Jutland (grey) and Funen (black). Likelihood ratio test of the effect of subplot: ** P<0.001. (EPS)
Article
Full-text available
Flower visiting insects provide a vitally important pollination service for many crops and wild plants. Recent decline of pollinating insects due to anthropogenic modification of habitats and climate, in particular from 1950's onwards, is a major and widespread concern. However, few studies document the extent of declines in species diversity, and...
Article
Full-text available
Ecological networks are complexes of interacting species, but not all potential links among species are realized. Unobserved links are either missing or forbidden. Missing links exist, but require more sampling or alternative ways of detection to be verified. Forbidden links remain unobservable, irrespective of sampling effort. They are caused by l...
Article
Red clover is a key floral ressource for bumblebees (Bombus spp.). We here investigate variation within and among red clover fields in species richness and abundance of Bombus spp. in addition to Apis mellifera. Bumblebee individuals were grouped into the following functional groups, based on castes and tongue length: (1) all queens, (2) all worker...
Article
Studies of ecological networks usually focus upon interaction patterns among species. However, linkage among species is mediated by their constituting individuals. Thus, every linked species pair in a network encapsulates a new network of interacting individuals. Very few studies outside the sociology of larger animals have investigated networks at...
Article
Full-text available
Ecological networks are typically complex constructions of species and their interactions. During the last decade, the study of networks has moved from static to dynamic analyses, and has attained a deeper insight into their internal structure, heterogeneity, and temporal and spatial resolution. Here, we review, discuss and suggest research lines i...
Article
Full-text available
Article
Pollination networks are representations of all interactions between co-existing plants and their flower visiting animals at a given site. Although the study of networks has become a distinct sub-discipline in pollination biology, few studies have attempted to quantify spatio-temporal variation in species composition and structure of networks. We h...
Article
1. Co-existing plants and flower-visiting animals often form complex interaction networks. A long-standing question in ecology and evolutionary biology is how to detect nonrandom subsets (compartments, blocks, modules) of strongly interacting species within such networks. Here we use a network analytical approach to (i) detect modularity in pollina...
Article
The introduction of an alien top predator, the brown treesnake (Boiga irregularis), has resulted in severe losses of native vertebrate populations in Guam. Among these are important pollinators and seed dispersers. This study is a first attempt to document cascading effects on vertebrate-pollinated native plant species in Guam. We investigated flow...
Article
Sex ratio variation was investigated in natural populations of six dioecious shrub species of Lindera in Japan. Interspecific differences in sex ratio were examined in relation to patterns of population structure, floral dimorphism, fruit production and intersexual differences in herbivory. Sex ratios tended towards equality or bias in favour of ma...
Article
In this study we investigated floral biology and flower-visiting insect fauna in natural populations of six dioecious species of Lindera (Lauraceae) in Kyoto, Japan. Flowers of the Lindera species were similar in structure and floral attractants, and were visited by a wide range of insects. Although typical of generalist-pollinated flowers, intersp...
Article
Full-text available
In natural communities, species and their interactions are often organized as nonrandom networks, showing distinct and repeated complex patterns. A prevalent, but poorly explored pattern is ecological modularity, with weakly interlinked subsets of species (modules), which, however, internally consist of strongly connected species. The importance of...
Article
Full-text available
Using a sample of 1,403 flowering plant species, we tested the hypothesis that flower openness and flowervisitor generalization level of a plant species correlate positively. The “flower-visitor generalization level” Ln of a flowering plant species n, here defined as number of flower-visiting animal species attracted to the flowers of n in a given...
Article
Heathlands of Northwest Europe, which once covered extensive areas, are now reduced to small and large fragments in an agricultural landscape. In this study, we investigate the effect of fragmentation on the flower-visiting insect fauna in relation to species composition, level of specialization/generalization at the adult and larval stages, and la...
Article
Full-text available
We investigated the pollination and reproductive biology of two Canary Island endemics, Solanum vespertilio and S. lidii (Solanaceae). We measured male function (pollen development), female function (fruit initiation) and spatial arrangement of reproductive parts within flowers and inflorescences. Furthermore, we observed flower visitors and monito...
Article
Full-text available
A pollination network may be either 2-mode, describing trophic and reproductive interactions between communities of flowering plants and pollinator species within a well-defined habitat, or 1-mode, describing interactions between either plants or pollinators. In a 1-mode pollinator network, two pollinator species are linked to each other if they bo...
Article
Full-text available
We investigated the pollination and reproductive biology of two Canary Island endemics, Solanum vespertilio and S. lidii (Solanaceae). We measured male function (pollen development), female function (fruit initiation) and spatial arrangement of reproductive parts within flowers and inflorescences. Furthermore , we observed flower visitors and monit...
Article
Aims Several bird-pollinated or ornithophilous flowers are present on the Macaronesian archipelagos, the Canary Islands and Madeira, but absent from nearby NW Africa and Europe. In Macaronesia, no specialist nectar-feeding birds are found, but several generalist passerine bird species visit flowers for nectar. Two hypotheses attempt to explain the...
Article
Summary 1. The bird-flower element of the Canary Islands is a group of endemic plants having traits characteristic of bird pollination, and some are visited by opportunistically nectar-feeding passerine birds. 2. We investigated evolutionary changes in nectar sugar composition in seven Canarian lineages of ornithophilous plant species and their ent...
Article
Full-text available
The aim of this study was to investigate effects of introduced honey bees (Apis mellifera) on native pollination interactions of Echium wildpretii ssp. wildpretii in the sub-alpine desert of Tenerife. We selected two study populations, one dominated by honey bees, while the other was visited by many native insects. During peak activity period of in...
Article
Echium (Boraginaceae) is one of the largest evolutionary radiations in the Canary Islands and exhibits considerable variation in geographical distribution patterns and floral characters. Flower visitors are mainly bees (Hymenoptera: Apoidea). We investigated factors determining the level of generalization for pollination in 20 endemic and one intro...
Article
Full-text available
The aim of this study was to investigate effects of introduced honey bees (Apis mellifera) on native pollination interactions of Echium wildpretii ssp. wildpretii in the sub-alpine desert of Tenerife. We selected two study populations, one dominated by honey bees, while the other was visited by many native insects. During peak activity period of in...
Article
Jasminum odoratissimum is a Madeira and Canary Islands endemic showing classic heterostyly, i.e. with long-styled flowers with anthers at a low level in the corolla tube and short-styled flowers with anthers at a high level in the corolla tube. Short-styled flowers have large pollen, whereas long-styled flowers have small pollen. The two types are...
Article
Full-text available
Confined within a volcanic caldera at 2000 m a.s.l., the sub-alpine desert of Tenerife, Canary Islands, harbors a distinct biota. At this altitude the climate is harsh and the growing season short. Hence, plant and animal communities, constituting the sub-alpine plant–flower-visitor network, are clearly delimited, both spatially and temporally. We...
Article
In this paper, we report observations of flower visitors of the endemic Echium wildpretii in Tenerife, Canary Islands. This plant inhabits the high altitudinal sub-alpine zone, which is characterized by a harsh climate, low species diversity and a short growing season. Echium wildpretii is a monocarpic perennial, producing a 2–3 m column-shaped, re...
Article
 I have investigated the reproductive biology of four dioecious species of Lindera in Japan: Lindera obtusiloba Bl., L. umbellata Thunb., L. erythrocarpa Makino, and L. glauca Bl. The sex ratios in populations of the first three species are close to equality, but in L. glauca only female individuals are found in Japan, although males are known from...
Article
Full-text available
Aims Several bird-pollinated or ornithophilous flowers are present on the Macaronesian archipelagos, the Canary Islands and Madeira, but absent from nearby NW Africa and Europe. In Macaronesia, no specialist nectar-feeding birds are found, but several generalist passerine bird species visit flowers for nectar. Two hypotheses attempt to explain the...

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