Variation in wild bee assemblages along climatic gradients is still poorly known, particularly in eastern Canada. In this study, we assessed wild bee communities in forest stands that were recently clearcut along a latitudinal bioclimatic gradient. The analyses were conducted at two taxonomic levels: first at the genus level for bees as a whole (Anthophila) and then at the species level for bumble bees (Bombus spp. Latreille) (Hymenoptera: Apidae). Coloured pan traps were used to catch bees and a point-intercept method was used to survey floristic composition at each site. Abundance and richness of Anthophila genera and abundance of bumble bee species were inversely related to latitude, but richness of bumble bee species was not, being instead associated with sections of the gradient. These results indicate that the relationship between wild bee diversity and latitude varies among taxa and that climate and floristic resources probably each play a role. Bombus terricola, a species of concern in eastern Canada, was found in relatively high numbers throughout the study area. To our knowledge, this study provides the first assessment of wild bees in clearcuts in the province of Quebec, showing a clear differentiation of the communities along a spatial bioclimatic gradient.

Obtaining losers’ consent after an election is often taken for granted in liberal democracies. However, it can pose a real challenge for any type of democratic decision-making in which participants hold conflicting views about the issues of the day. In this research note, we examine losers’ reactions to the votes taken in a citizen deliberative assembly. In such an assembly, much effort is devoted to informing the participants about the merits and limits of various options and ensuring that they form their own reasoned opinions about the issue. Based on this information, people are bound to reach different conclusions, and any vote on a specific option therefore generates winners and losers. While there is a large literature exploring the winner-loser gap in elections, we know little about how participants in a deliberative assembly react when they realize that the assembly chooses a different position than theirs. We leverage data from a citizen assembly held in Canada. We find a high degree of satisfaction with the conduct of the assembly, among both winners and losers.

This work is a numerical study of a transitional shock wave boundary layer interaction (SWBLI). The main goal is to improve our understanding of the well-known low-frequency SWBLI unsteadiness and especially the suspected role of triadic interactions in the underlying physical mechanism. To this end, a direct numerical simulation is performed using a high-order finite-volume scheme equipped with a suitable shock capturing procedure. The resulting database is then extensively post-processed in order to extract the main dynamical features of the interaction zone dynamics (involved characteristic frequencies, characteristics of the vortical structures, etc.). The dynamical organisation and space–time evolution of the flow at dominant frequencies are then further characterised by mean of an spectral proper orthogonal decomposition analysis. In order to study the role of triadic interactions occurring in the interaction region, a bispectral mode decomposition analysis is applied to the database. It allows us to extract the significant triadic interactions, their location and the resulting physical spatial modes. Strong triadic interactions are detected in the downstream part of the separation bubble whose role on the low-frequency unsteadiness is characterised. All the results of the various analyses are then discussed and integrated to formulate a possible mechanism fuelling low-frequency SWBLI unsteadiness.

Outbreaks caused by migrant pests such as the armyworm, Mythimna unipuncta (Haworth, 1809) (Lepidoptera: Noctuidae), are generally unpredictable. In the province of Quebec, Canada, the arrival and dispersal of armyworms is monitored by capturing males using pheromone traps. Because only males are captured in pheromone-baited traps, trap catch is not predictive of subsequent larval occurrence and damage. We used traps baited with a feeding attractant to capture both male and female armyworm moths and evaluate their flight period at 11 sites across the province in 2018 and 2019. The reproductive status of females was also investigated by dissecting their reproductive apparatus to determine if they were sexually active when captured. The results showed two peak flight periods between May and August but high variation at the different sites and between years. Both sexes migrate in Quebec at the same time but in variable and unpredictable proportions. All spring migrant females had mated before capture, whereas some unmated females were captured later in the season. These results provide useful information to better monitor the armyworm in Quebec and to develop more appropriate integrated pest management strategies.

We give a criterion for separability of subgroups of certain outer automorphism groups. This answers questions of Hagen and Sisto, by strengthening and generalizing a result of theirs on mapping class groups.

Leptospirosis is a widespread zoonosis caused by bacteria of the genus Leptospira. Although crucial to mitigate the disease risk, basic epidemiological information is lacking, such as the identities of Leptospira maintenance hosts. The raccoon (Procyon lotor), an alien invasive species in France, could pose a public health risk if it carries pathogenic Leptospira. We investigated the rate and type (selective vs. unselective) of Leptospira carriage in the two main raccoon populations in France. Out of the 141 raccoons collected, seven (5%) tested quantitative PCR positive, targeting lfb1 gene, based on kidney, lung, and urine samples. Phylogenetic analysis revealed the presence of three different L. interrogans clusters. The results suggest that raccoons were more likely accidental hosts and made only a limited contribution to Leptospira maintenance.

We use $123$ three-dimensional direct numerical simulations to study fingering convection in non-rotating spherical shells. We investigate the scaling behaviour of the flow length scale, the non-dimensional heat and compositional fluxes $Nu$ and $Sh$ and the mean convective velocity over the fingering convection instability domain defined by $1 \leq R_\rho < Le$, $R_\rho$ being the ratio of density perturbations of thermal and compositional origins and $Le$ the Lewis number. We show that the chemical boundary layers are marginally unstable and adhere to the laminar Prandtl–Blasius model, hence explaining the asymmetry between the inner and outer spherical shell boundary layers. We develop scaling laws for two asymptotic regimes close to the two edges of the instability domain, namely $R_\rho \lesssim Le$ and $R_\rho \gtrsim 1$. For the former, we develop novel power laws of a small parameter $\epsilon$ measuring the distance to onset, which differ from theoretical laws published to date in Cartesian geometry. For the latter, we find that the Sherwood number $Sh$ gradually approaches a scaling $Sh\sim Ra_\xi ^{1/3}$ when $Ra_\xi \gg 1$; and that the Péclet number accordingly follows $Pe \sim Ra_\xi ^{2/3} |Ra_T|^{-1/4}$, $Ra_T$ and $Ra_{\xi}$ being the thermal and chemical Rayleigh numbers. When the Reynolds number exceeds a few tens, we report on a secondary instability which takes the form of large-scale toroidal jets which span the entire spherical domain. Jets distort the fingers, resulting in Reynolds stress correlations, which in turn feed the jet growth until saturation. This nonlinear phenomenon can yield relaxation oscillation cycles.

This paper presents a dictionary-based study of French loanwords in contemporary English in order to investigate the location of primary stress in these loanwords. Four factors are found to be significant predictors of the position of primary stress: endings, word complexity, the segmental structure of the final syllable, and syllable count. Moreover, this study confirms previous observations on the tendency for American English to have more final stress in French loanwords than British English. Finally, the implications of our findings are discussed in light of a model that assumes that English phonology consists of distinct interacting subsystems.

In most of the literature on English phonology, historically prefixed words such as contain, respect or submit are seen as having no morphological structure synchronically. However, such words were treated as complex in the early generative literature and are still analysed in that way in part of the literature. In this paper, we seek to review the evidence for the claim that such words are simplex words, which predicts that they should pattern with words with no internal structure in their phonological and morphological behaviours and in psycholinguistic experiments. We show that the evidence does not support that claim and shows that these words should be treated as morphologically complex units, although they differ from words with productive morphology. As these words tend to be partly or entirely opaque semantically, this raises the question of how such structures may be learned. We argue that the recurrence of forms is the main factor leading to their identification and lay out a possible order of acquisition of various morphological structures. Finally, we argue that theories of phonology may account for this by allowing the reference to morphological constituents whose semantics are impoverished.

The Sun’s global inertial modes are very sensitive to the solar differential rotation and to properties of the deep solar convection zone which are currently poorly constrained. These properties include the superadiabatic temperature gradient, the latitudinal entropy gradient, and the turbulent viscosity. The inertial modes also play a key role in controlling the Sun’s large-scale structure and dynamics, in particular the solar differential rotation. This paper summarizes recent observations and advances in the (linear and nonlinear) modeling of the solar inertial modes.

The seedcorn maggot, Delia platura (Meigen) (Diptera: Anthomyiidae), is reported as a polyphagous pest species found in numerous crops, including onion, corn, crucifers, and soy. Two morphologically identical genetic lines of D. platura (H- and N-lines) with distinct distribution ranges were recently discovered. Although many biological traits have been described for D. platura, no study to date has been conducted on the life history strategies and reproductive behaviours of its two lines. Using laboratory-reared colonies, this project investigates the effect of group composition (sex ratio and density) on the mating success and preoviposition period of the two D. platura lines. We found a substantial increase in mating success with increasing proportion of males within mating groups for both lines, whereas we found group density had negligible effects. However, the H-line had a lower average mating probability across treatments compared to the N-line. The preoviposition period decreased as the ratio of males to female increased at low density only for the N-line, and the opposite trend was observed at high density for both lines. These results suggest differences between the mating systems of these two lines, thereby highlighting the need for further research into the factors that influence their respective mating systems.

Thrips (Thysanoptera: Thripidae) communities in agroecosystems are poorly known, particularly in Québec, Canada, where thrips can cause damage in strawberry crops. The phenology of anthophagous thrips and their use of cultivated and wildflower resources were monitored in strawberry agroecosystems, encompassing strawberry (Rosaceae) fields and adjacent uncultivated margins, on Orléans Island, Québec, Canada. A community comprised of 11 thrips species was described, dominated during the whole season by pest species Frankliniella tritici and F. intonsa, which is a first mention in Eastern Canada. Surprisingly, the major strawberry pest F. occidentalis was absent in our samples. Thrips species richness and abundance on wildflowers varied, with few flowering plant species supporting a majority of the community. Sampling sites and local wildflower presence influenced the thrips species assemblage observed on strawberry crops. Such a high thrips diversity was unexpected in this agroecosystem. The identified associations between pest thrips and wildflower species will be useful to develop better control programmes in strawberry crops.

A left orderable monster is a finitely generated left orderable group all of whose fixed point-free actions on the line are proximal: the action is semiconjugate to a minimal action so that for every bounded interval I and open interval J, there is a group element that sends I into J. In his 2018 ICM address, Navas asked about the existence of left orderable monsters. By now there are several examples, all of which are finitely generated but not finitely presentable. We provide the first examples of left orderable monsters that are finitely presentable, and even of type $F_\infty $. These groups satisfy several additional properties separating them from the previous examples: they are not simple, they act minimally on the circle, and they have an infinite-dimensional space of homogeneous quasimorphisms. Our construction is flexible enough that it produces infinitely many isomorphism classes of finitely presented (and type $F_{\infty }$) left orderable monsters.