Terrestrial isopods (Isopoda: Oniscidea), also known as sowbugs or woodlice, are one of the few groups of crustaceans with fully terrestrial members. Sowbugs are readily transported by human activity, with many species having been introduced worldwide. Although nonnative sowbugs have been present in Canada for more than 150 years, the study of sowbugs in Canada has been largely overlooked, especially in the Prairie Provinces. We conducted the first survey of sowbug species in Alberta, with additional collections from British Columbia, Saskatchewan, Ontario, and Newfoundland. We compiled an updated Canadian species checklist of 32 species from 12 families, including seven new species records for Canada since the previous 2001 checklist. Species with older records tend to occupy more provinces than species recorded more recently. Nine sowbug species occur in Alberta: all are nonnative and originate from Europe or Asia. Our collection of Nagurus cristatus (Dollfus, 1899) (Trachelipodidae) from Edmonton represents the first record from Canada. We support our identifications with molecular data (cytochrome c oxidase subunit 1 barcode region). Further surveys of sowbugs in the Prairie Provinces may uncover additional species; we encourage reporting of sowbug bycatch from arthropod surveys and note the utility of community science platforms for conducting sowbug surveys.

The 1891 International Gymnastics Festival, Sweden’s first international sports event and five years before the first modern Olympic Games, was hugely controversial. Many people argued that hosting the festival threatened the survival of Sweden’s own “Ling gymnastics” and even Swedish culture itself. These critics feared that hosting the competition, which would be shaped by outside influence, in turn would disadvantage Ling gymnastics and reduce confidence in a system that Swedes had believed to be the best in the world. The episode illustrates the complications arising from the emergence of international athletic competition and the underlying tension between nationalist and internationalist considerations.

British bioprospecting in the last decades of imperial China was propelled not merely by natural history and commerce, but significantly by China’s evolving foreign relations under international treaties. This article unravels the legal dimension of British naturalists’ collecting activities in late Qing China, challenging indiscriminate associations of their presence with imperialist or illicit plunder of natural resources. While the Sino-British treaties did not explicitly address plant collecting, they authorized British naturalists, as travelers, to move from Guangzhou to treaty ports and subsequently, under passports, into the interior. In practice, their expeditions encompassed both licit travel and illicit transgressions; and plant collecting was either officially acquiesced to or incorporated into the general regulation of travel for pleasure, coupled with lax inspection of plant outflow. From 1863, initially under British influence, Qing authorities even legalized international trade in tea seeds and plants, thus diminishing their control of a species economically vital to China. However, an international legal consensus on sovereign resource rights remained absent. The evolving legal environment for the botanical connection between the British Empire and late Qing China preceded the integration of natural resources into the agenda of international law, nuancing understanding of the politics of nature.

Twisted arrow $\infty$-categories of $(\infty ,1)$-categories were introduced by Lurie, and they have various applications in higher category theory. Abellán García and Stern gave a generalization to twisted arrow $\infty$-categories of $(\infty ,2)$-categories. In this paper, we introduce another simple model for twisted arrow $\infty$-categories of $(\infty ,2)$-categories.

This article studies the stability of the $L_p$ torsional measure in dimension $n \geq 3$. We show that the ball is the unique domain for the solution to the related overdetermined boundary value problem. Two concepts of relative asymmetry distance and $L^c$-distance have been used to estimate the stability of the $L_p$ torsional measure, based on different stability results of the $L_p$-width functionals. The result has been uniformly given via relative asymmetry distance for all $1<p \neq n+2$. In terms of $L^c$-distance, the result has been split into two cases: $p\in (1,n)$, and $n< p\neq n+2$.

Two Late Ordovician cornulitid species, Cornulites richmondensis (Miller, 1874) and Cornulites hemistriatus new species, from the Ellis Bay and Vaureal formations of Anticosti Island, eastern Canada, are each shown in this study to have a thick, punctate, cross-bladed lamellar, calcitic conch wall, a crested fold, a septate juvenile part, and endoconic chamber deposit. These Late Ordovician, free-living (i.e., nonencrusting) forms of Cornulites Schlotheim, 1820 have characters intermediate between Cornulites and the late Silurian-Devonian forms of Tentaculites Schlotheim, 1820, particularly by having incipient inner layers and poorly fused annuli, but lacking cornulitid-type vesicular microstructures. The described cornulitids are similar to brachiopods in their cross-bladed lamellae and pseudopunctae, but their lamellar layers are considerably finer and much less distinct than those of brachiopod shells.

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The study documents the embryonic and larval development of Clarias dussumieri, a Near-Threatened, cultivable, and highly valued food fish endemic to the Western Ghats. Induced breeding facilitated detailed observation of developmental stages using light microscopy. Unfertilized eggs measured 1.5 ± 0.02 mm in diameter and enlarged to 1.7 ± 0.10 mm after fertilization (∼13% increase). The first cleavage occurred at 00:36 ± 00:02 h, reaching 64 cells by 01:35 ± 00:06 h. Epiboly progressed from 30% at 03:20 ± 00:10 h to 50% at 04:30 ± 00:05 h and 90% at 05:50 ± 00:10 h; neurulation was evident by 07:40 ± 01:10 h and somites by 11:08 ± 01:26 h. The first heartbeat appeared during the pharyngula period (17:25 ± 01:30 h), and hatching occurred at 25:30 ± 01:30 h at 26–27°C. Hatched larvae were 4.2 ± 0.02 mm total length, observed few melanophores by 12 h, conspicuous eye pigmentation by 24 h, and body pigmentation spreading by day 2 (5.90 ± 0.04 mm).The yolk sac was fully absorbed by 72 ± 2.50 h post-hatching, marking the onset of exogenous feeding. By day 4 (pre-flexion), larvae reached 7.1 ± 0.02 mm; initial notochord flexion began around day 7 and post-flexion from day 10, with juvenile-like morphology evident by day 25 (15.27–17.80 mm). The standardized timelines and measurements provide a baseline for hatchery practice and conservation aquaculture of C. dussumieri, supporting protocol refinement for improving survival and growth under controlled conditions

In this article, we study the pressure at infinity of potentials defined over countable Markov shifts. We establish an upper semi-continuity result concerning the limiting behaviour of the pressure of invariant probability measures, where the escape of mass is controlled by the pressure at infinity. As a consequence, we establish criteria for the existence of equilibrium states and maximizing measures for uniformly continuous potentials. Additionally, we study the pressure at infinity of suspension flows defined over countable Markov shifts and prove an upper semi-continuity result for the pressure map.

This article considers British early nineteenth century attempts to reclaim Sagar Island, at the southwestern extremity of the Bengal delta, by clearing the island of jungle and settling and cultivating it—a project led first by colonial authorities at Calcutta and then by a joint-stock company established for the purpose, the Sagar Island Society. It considers the motivations behind the reclamation attempts, what they involved, and why they failed. The consequences – economic, human, and ecological—of the reclamation attempts are examined. The article reconstructs the almost entirely unknown history of events on Sagar Island from 1810 to 1833 through extensive new archival research and the study of rarely consulted publications from the period, before exploring their implications. In doing so, it sheds new light on the nature of British colonial capitalism and the environmental impact of British colonial interventions in South Asia, contributing to our understanding of the economic and environmental history of colonial Bengal and of the wider British imperial world. The article contends that events on Sagar Island offer a cautionary lesson about public and private initiatives to extend the frontiers of revenue extraction, and about the hubris of human efforts to ‘improve’ natural environments through large-scale projects of transformation. New insights are offered into the collusion between government and capital in British Bengal between the East India Company charter acts of 1813 and 1833, and into the colonial and capitalist origins of the Anthropocene.

Survivorship among individuals with CHD has expanded, bringing more pregnancies into routine care. In this issue, a single-centre retrospective case–control study (162 CHD deliveries vs 321 controls) reports higher composite maternal cardiac events (8.6 vs 3.4%; risk ratio 2.5, 95% CI 1.2–5.4), greater use of operative or assisted delivery, and an approximately doubled length of stay. Modified WHO class correlates with length of stay but not with discrete cardiac events; maternal age independently predicts cardiac events; rates of pre-eclampsia are lower in CHD. These findings support first-trimester cardio-obstetric triage, standardised delivery bundles, and capacity planning that uses risk class to anticipate monitoring needs, with routine 6–12-week postpartum review. Limitations include selection, era differences, and modest sample size. Overall, anticipatory planning and disciplined intrapartum decision-making remain key to safe, resource-aware care for pregnant women with CHD.