Robert A. Laird
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View article: Caloric restriction‐mediated reproductive lifespan extension across multiple strains of the clonal aquatic plant <i>Lemna turionifera</i>
Caloric restriction‐mediated reproductive lifespan extension across multiple strains of the clonal aquatic plant <i>Lemna turionifera</i> Open
Lifespan extension due to caloric restriction (CR) is a well‐established aspect of animal senescence that has been observed in many taxa. Contrastingly, there is much less evidence in plants, even though it is straightforward to manipulate…
View article: A demographic assessment of the Lansing Effect in duckweed ( <i>Lemna turionifera</i> Landolt)
A demographic assessment of the Lansing Effect in duckweed ( <i>Lemna turionifera</i> Landolt) Open
The Lansing Effect is the propensity for offspring of older parents to have shorter lifespans than offspring of younger parents. A recent review identified two demographic patterns that can produce the Lansing Effect: (i) a greater offspri…
View article: Caloric restriction extends lifespan in a clonal plant
Caloric restriction extends lifespan in a clonal plant Open
When subjected to dietary caloric restriction (CR), individual animals often outlive well‐fed conspecifics. Here, we address whether CR also extends lifespan in plants. Whereas caloric intake in animals comes from ingestion, in plants it d…
View article: POPULATION GENETIC STRUCTURE OF TWO CRYPTIC DUCKWEED SPECIES (Lemna minor & L. turionifera) IN ALBERTA USING A GENOTYPING-BY-SEQUENCING APPROACH
POPULATION GENETIC STRUCTURE OF TWO CRYPTIC DUCKWEED SPECIES (Lemna minor & L. turionifera) IN ALBERTA USING A GENOTYPING-BY-SEQUENCING APPROACH Open
Identifying the population genetic structure is important for the development of species-specific management plans. Investigating the population genetics of cryptic species is even more critical. Here we focus on two cryptic duckweed speci…
View article: Pace and shape of senescence in three species of duckweed
Pace and shape of senescence in three species of duckweed Open
Senescence is progressive bodily deterioration associated with declines in survival and fecundity in older age classes. There is great diversity in patterns of senescence across species, but these patterns can be difficult to compare forma…
View article: Hide and seek: molecular barcoding clarifies the distribution of two cryptic duckweed species across Alberta
Hide and seek: molecular barcoding clarifies the distribution of two cryptic duckweed species across Alberta Open
Regional and global biodiversity may be underestimated due to the presence of cryptic species: species that are morphologically similar, but genetically distinct. Here, we focus on two cryptic duckweed species, Lemna minor L. and Lemna tur…
View article: Siblicidal behaviour by larvae of the gregarious parasitoid Cotesia vanessae
Siblicidal behaviour by larvae of the gregarious parasitoid Cotesia vanessae Open
Contrasting life histories distinguish solitary from gregarious parasitoids. Females of solitary species typically lay one egg in a host; when more than one parasitoid is present in the host, larvae will kill their rivals so that only one …
View article: Control of<i>Trogoderma granarium</i>(Coleoptera: Dermestidae) Using High Temperatures
Control of<i>Trogoderma granarium</i>(Coleoptera: Dermestidae) Using High Temperatures Open
Khapra beetle, Trogoderma granarium Everts, is one of the world's most important pests of stored grain. Common in Africa and Asia, it is a quarantine insect for much of the rest of the world where methyl bromide has traditionally been used…
View article: Skimming the surface: duckweed as a model system in ecology and evolution
Skimming the surface: duckweed as a model system in ecology and evolution Open
With almost 400,000 species to choose from, plant biologists seeking a study species have no shortage of raw material. In the face of such diversity, plant model systems have come to the fore in many disciplines, with Arabidopsis thaliana …
View article: Exploring the performance of intransitivity indices in predicting coexistence in multispecies systems
Exploring the performance of intransitivity indices in predicting coexistence in multispecies systems Open
Recent evidence suggests that intransitive competition (as in the game “rock‐paper‐scissors,” and in contrast to transitive or hierarchical competition) may be common in natural plant communities. This is important as theoretical analyses …
View article: Among‐strain consistency in the pace and shape of senescence in duckweed
Among‐strain consistency in the pace and shape of senescence in duckweed Open
Comparative studies have demonstrated extensive variation in age trajectories of mortality and fecundity, both within and among species, with many taxa exhibiting a general pattern of age‐related demographic decline referred to as senescen…
View article: Data from: Among-strain consistency in the pace and shape of senescence in duckweed
Data from: Among-strain consistency in the pace and shape of senescence in duckweed Open
1.Comparative studies have demonstrated extensive variation in age-trajectories of mortality and fecundity, both within and among species, with many taxa exhibiting a general pattern of age-related demographic decline referred to as senesc…
View article: Offspring of older parents are smaller—but no less bilaterally symmetrical—than offspring of younger parents in the aquatic plant <i>Lemna turionifera</i>
Offspring of older parents are smaller—but no less bilaterally symmetrical—than offspring of younger parents in the aquatic plant <i>Lemna turionifera</i> Open
Offspring quality decreases with parental age in many taxa, with offspring of older parents exhibiting reduced life span, reproductive capacity, and fitness, compared to offspring of younger parents. These “parental age effects,” whose con…
View article: Data from: Calculating competitive intransitivity: computational challenges
Data from: Calculating competitive intransitivity: computational challenges Open
Intransitive, or 'rock-paper-scissors' competition is compelling because it promotes species coexistence and because recent work suggests it may be common in natural systems. One class of intransitivity indices works by considering s, the …
View article: A multigenerational effect of parental age on offspring size but not fitness in common duckweed (<i><scp>L</scp>emna minor</i>)
A multigenerational effect of parental age on offspring size but not fitness in common duckweed (<i><span>L</span>emna minor</i>) Open
Classic theories on the evolution of senescence make the simplifying assumption that all offspring are of equal quality, so that demographic senescence only manifests through declining rates of survival or fecundity. However, there is now …
View article: A Review of the McMorran Diet for Rearing Lepidoptera Species With Addition of a Further 39 Species
A Review of the McMorran Diet for Rearing Lepidoptera Species With Addition of a Further 39 Species Open
Research on cutworms led us to explore the use of the McMorran diet to rear lepidopteran species, mainly Noctuidae, under laboratory conditions. We documented the development of 103 lepidopteran species, including 39 species not previously…
View article: Appendix C. Discussion of an alternative explanation for the reversal in the effect of local vs. global intransitive competition on short- and long-term coexistence.
Appendix C. Discussion of an alternative explanation for the reversal in the effect of local vs. global intransitive competition on short- and long-term coexistence. Open
Discussion of an alternative explanation for the reversal in the effect of local vs. global intransitive competition on short- and long-term coexistence.
View article: Appendix A. Movies of the lattice model depicting six-species competition, varying the localness of competition ("local" vs. "global") and the level of intransitivity ("hierarchical" vs. "intransitive").
Appendix A. Movies of the lattice model depicting six-species competition, varying the localness of competition ("local" vs. "global") and the level of intransitivity ("hierarchical" vs. "intransitive"). Open
Movies of the lattice model depicting six-species competition, varying the localness of competition ("local" vs. "global") and the level of intransitivity ("hierarchical" vs. "intransitive").
View article: Appendix B. Figures showing the raw data for the number of generations until the first extinction and final species richness.
Appendix B. Figures showing the raw data for the number of generations until the first extinction and final species richness. Open
Figures showing the raw data for the number of generations until the first extinction and final species richness.