A5070312341- Plant and animal studies
- Ecology and Vegetation Dynamics Studies
- Insect and Arachnid Ecology and Behavior
- Plant Parasitism and Resistance
- Evacuation and Crowd Dynamics
- Animal Behavior and Reproduction
- Plant Reproductive Biology
- Fire effects on ecosystems
- Animal and Plant Science Education
- Insect and Pesticide Research
- Evolutionary Game Theory and Cooperation
- Traffic control and management
- Traffic and Road Safety
- Plant Diversity and Evolution
- Forest Ecology and Biodiversity Studies
- Animal Ecology and Behavior Studies
- Neurobiology and Insect Physiology Research
- Forest Insect Ecology and Management
- Species Distribution and Climate Change
- Plant Physiology and Cultivation Studies
- Transportation Planning and Optimization
- Fern and Epiphyte Biology
- Flowering Plant Growth and Cultivation
- Computational Physics and Python Applications
- Forensic Entomology and Diptera Studies
Indiana University Bloomington
2023-2024
Australian Regenerative Medicine Institute
2008-2022
Monash University
2013-2022
National Evolutionary Synthesis Center
2013-2015
University of Calgary
2006
University of California, Santa Barbara
2006
University of Pittsburgh
2006
University of Wisconsin–Madison
1984-1996
Princeton University
1992-1996
Determining whether seed production is pollen limited has been an area of intensive empirical study over the last two decades. Yet current evidence does not allow satisfactory assessment causes or consequences limitation. Here, we critically evaluate existing theory and issues concerning Our main conclusion that a change in approach needed to determine limitation reflects random fluctuations around pollen–resource equilibrium, adaptation stochastic pollination environments, chronic syndrome...
▪ Abstract Quantifying the extent to which seed production is limited by availability of pollen has been an area intensive empirical study over past few decades. Whereas theory predicts that augmentation should not increase production, numerous studies report significant and strong limitation. Here, we use a variety approaches examine correlates limitation in effort understand its occurrence importance plant evolutionary ecology. In particular, role recent ecological perturbations...
As pollinators decline globally, competition for their services is expected to intensify, and this antagonism may be most severe where the number of plant species greatest. Using meta-analysis comparative phylogenetic analysis, we provide a global-scale test whether reproduction becomes more limited by pollen receipt (pollen limitation) as coexisting increases. predicted, find significant positive relationship between limitation richness. In addition, pattern particularly strong that are...
A global dataset shows that animal pollinators are crucial for reproduction in half of wild flowering plants.
Abstract Land use change, by disrupting the co-evolved interactions between plants and their pollinators, could be causing plant reproduction to limited pollen supply. Using a phylogenetically controlled meta-analysis on over 2200 experimental studies more than 1200 wild plants, we ask if land intensification is at global scales. Here report that reliant pollinators in urban settings are similarly pollinator-reliant other landscapes. Plants functionally specialized bee natural managed...
Summary Colour signals are a major cue in putative pollination syndromes. There is evidence that the reflectance spectra of many flowers target distinctive visual discrimination abilities hymenopteran insects, but far less known about bird‐pollinated flowers. Birds hypothesized to exert different selective pressures on floral colour compared with hymenopterans because differences their systems. We measured 206 A ustralian angiosperm species whose visitors from direct observation rather than...
Summary Because establishing a new population often depends critically on finding mates, individuals capable of uniparental reproduction may have colonization advantage. Accordingly, there should be an over‐representation colonizing species in which can reproduce without mate, particularly isolated locales such as oceanic islands. Despite the intuitive appeal this filter hypothesis (known Baker's law), more than six decades analyses yielded mixed findings. We assembled dataset island and...
The number of ovules per flower varies over several orders magnitude among angiosperms. Here we consider evidence that stochastic uncertainty in pollen receipt and ovule fertilization has been a selective factor the evolution flower. We hypothesize variation floral mating success creates an advantage to producing many because plant will often gain more fitness from occasional abundant seed production randomly successful flowers than it loses resource commitment less flowers. Greater...
Summary Both the phylogenetic structure and trait composition of flowering plant communities may be expected to change with altitude. In particular, floral colours are thought vary altitude because Hymenoptera typically decline in importance as pollinators while Diptera Lepidoptera become more important at higher elevations. Thus, ecological filtering among elevation zones competitive processes co‐occurring species within could influence chromatic cues present low high We collected data from...
Summary Geographical variation in the interacting traits of plant–pollinator mutualism can lead to local adaptive differentiation. We tested Darwin's hypothesis reciprocal selection as a key driving force for evolution floral an alpine ginger ( Roscoea purpurea ) and proboscis length tabanid fly Philoliche longirostris ). documented pattern trait R. P. across five populations. At each site, we quantified pollinator‐mediated on display area, inflorescence height corolla by comparing gradients...
The modular morphology of plants has important consequences for reproductive strategies. Ovules are packaged in discrete structures (flowers) that usually vary stochastically pollen capture and ovule fertilization, because the vagaries transfer by external agents. Different packaging schemes may use limited resources more or less effectively, so some number ovules per flower be optimal, given prevailing probabilities fertilization. I derive a phenotypic model maximizes expected total...
Colonies of Atta cephalotes (Myrmicinae: Formicidae) construct cleared paths between their nest and the vegetation sources at which they harvest leaf tissue. Here, we employ ideas from traffic engineering to study streams laden unladen ants on these paths. The relationship average speed concentration workers road surface follows a similar what is expected by analogy fluid dynamics. Although composed eusocial organisms with common interest in group success, coarse-grained behavior displays...
Flowering plants often produce more flowers than fruits. An initial "excess" of flowers, although making no numerical contribution to fruit set, may indirectly increase female reproductive success by allowing selective maturation fruits superior quality. I use a framework based on order statistics assess the potential fitness benefit from this "wider choice" mechanism. The analysis shows that floral surplus with subsequent abortion can generate large increases in mean fitness. However,...
We studied biotically pollinated angiosperms on Macquarie Island, a remote site in the Southern Ocean with predominately or exclusively dipteran pollinator fauna, an effort to understand how flower colour affects community assembly. compared distinctive group of cream-green Island flowers flora likely source pools immigrants and continental from high latitude northern hemisphere. used both hymenopteran models phylogenetically informed analyses explore chromatic component The species are very...
Abstract Plant reproduction relies on transfer of pollen from anthers to stigmas, and the majority flowering plants depend biotic or abiotic agents for this transfer. A key metric characterizing if receipt is insufficient limitation, which assessed by supplementation experiments. In a experiment, fruit seed production flowers exposed natural pollination compared that following hand either (i.e. manual outcross addition without bagging) outcrossing bagged flowers, excludes pollination. The...