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The Hawaiian archipelago was formerly home to one of the most species-rich land snail faunas (> 752 species), with levels of endemism > 99%. Many native Hawaiian land snail species are now extinct, and the remaining fauna is vulnerable. Unfortunately, lack of information on critical habitat requirements for Hawaiian land snails limits the development of effective conservation strategies. The purpose of this study was to examine the plant host preferences of native arboreal land snails in Puʻu Kukui Watershed, West Maui, Hawaiʻi, and compare these patterns to those from similar studies on the islands of Oʻahu and Hawaiʻi. Concordant with studies on other islands, we found that four species from three diverse families of snails in Puʻu Kukui Watershed had preferences for a few species of understorey plants. These were not the most abundant canopy or mid canopy species, indicating that forests without key understorey plants may not support the few remaining lineages of native snails. Preference for Broussaisia arguta among various island endemic snails across all studies indicates that this species is important for restoration to improve snail habitat. As studies examining host plant preferences are often incongruent with studies examining snail feeding, we suggest that we are in the infancy of defining what constitutes critical habitat for most Hawaiian arboreal snails. However, our results indicate that preserving diverse native plant assemblages, particularly understorey plant species, which facilitate key interactions, is critical to the goal of conserving the remaining threatened snail fauna.
Questions remain regarding whether genetic influences on early life psychopathology overlap with cognition and show developmental variation.
Using data from 9,421 individuals aged 8–21 from the Philadelphia Neurodevelopmental Cohort, factors of psychopathology were generated using a bifactor model of item-level data from a psychiatric interview. Five orthogonal factors were generated: anxious-misery (mood and anxiety), externalizing (attention deficit hyperactivity and conduct disorder), fear (phobias), psychosis-spectrum, and a general factor. Genetic analyses were conducted on a subsample of 4,662 individuals of European American ancestry. A genetic relatedness matrix was used to estimate heritability of these factors, and genetic correlations with executive function, episodic memory, complex reasoning, social cognition, motor speed, and general cognitive ability. Gene × Age analyses determined whether genetic influences on these factors show developmental variation.
Externalizing was heritable (h2 = 0.46, p = 1 × 10−6), but not anxious-misery (h2 = 0.09, p = 0.183), fear (h2 = 0.04, p = 0.337), psychosis-spectrum (h2 = 0.00, p = 0.494), or general psychopathology (h2 = 0.21, p = 0.040). Externalizing showed genetic overlap with face memory (ρg = −0.412, p = 0.004), verbal reasoning (ρg = −0.485, p = 0.001), spatial reasoning (ρg = −0.426, p = 0.010), motor speed (ρg = 0.659, p = 1x10−4), verbal knowledge (ρg = −0.314, p = 0.002), and general cognitive ability (g)(ρg = −0.394, p = 0.002). Gene × Age analyses revealed decreasing genetic variance (γg = −0.146, p = 0.004) and increasing environmental variance (γe = 0.059, p = 0.009) on externalizing.
Cognitive impairment may be a useful endophenotype of externalizing psychopathology and, therefore, help elucidate its pathophysiological underpinnings. Decreasing genetic variance suggests that gene discovery efforts may be more fruitful in children than adolescents or young adults.
This chapter examines the construction and representation of borders in China under the Ming dynasty (1368-1644). It considers the spatial dimensions of the Mongol empire, which was the Ming dynasty’s immediate predecessor. It examines the Ming court’s efforts to conquer or coopt Mongol power-holders and their territories, its plans to establish lasting control over those regions and their peoples, and its discursive and administrative strategies to describe and regulate issues of diversity and distance. The chapter reviews changes in the Ming dynasty’s geopolitical engagement in eastern Eurasia, tracing the dynasty’s loss of territory and influence along the northern and western borders and simultaneously a steady expansion of state institutions into the southwestern frontier. The essay concludes with developments during the sixteenth and seventeenth centuries, including responses to early Western European agents of empire in East Asia and, more broadly, the expansion of Chinese interest into maritime Asia.
This study consisting of six field experiments was conducted in 2018 and 2019 to evaluate the tolerance of four corn hybrids (P9998AM, P9840AM, DKC42-60RIB, and DKC43-47RIB) to the tank mix of tolpyralate + atrazine with a commercial glyphosate formulation. At 1 wk after application (WAA), two corn hybrids (P9998AM and P9840AM) exhibited more injury from tolpyralate + atrazine (2× rate) applied alone and in combination with glyphosate than DKC42-60RIB and DKC43-47RIB; however, all corn hybrids responded similarly with respect to visible injury 2, 4, and 8 WAA, stand loss, and yield. Application of tolpyralate + atrazine or glyphosate + tolpyralate + atrazine at the 2× rate caused greater corn injury (up to 27%) than tolpyralate + atrazine or glyphosate + tolpyralate + atrazine at the 1× rate (up to 8%) at 1 WAA. The addition of commercial glyphosate with tolpyralate + atrazine did not enhance injury symptoms. Results of this study show that there is a wide margin of corn safety with tolpyralate + atrazine applied alone and in combination with a commercial formulation of glyphosate.
Tolpyralate is a new 4-hydroxyphenyl-pyruvate dioxygenase (HPPD)–inhibiting herbicide for weed control in corn. Previous research has reported efficacy of tolpyralate + atrazine on several annual grass and broadleaf weed species; however, no studies have evaluated weed control of tolpyralate + atrazine depending on time-of-day (TOD) of application. Six field experiments were conducted over a 2-yr period (2018, 2019) near Ridgetown, ON, to determine if there is an effect of TOD of application on tolpyralate + atrazine efficacy on common annual grass and broadleaf weeds. An application was made at 3-h intervals beginning at 06:00 h with the last application at 24:00 h. There was a slight TOD effect on velvetleaf, pigweed species, and common ragweed control with tolpyralate + atrazine; however, the magnitude of change throughout the day was ≤3% at 2, 4, or 8 wk after application (WAA). There was no effect of TOD of tolpyralate + atrazine on the control of lambsquarters, barnyardgrass, and green foxtail. All weed species were controlled ≥88% at 8 WAA. There was no effect of TOD of tolpyralate + atrazine application on corn yield. Results of this study show no evidence of a TOD effect on weed control efficacy with tolpyralate + atrazine.
Passive acoustic monitoring is rapidly gaining recognition as a practical, affordable and robust tool for measuring gun hunting levels within protected areas, and consequently for its potential to evaluate anti-poaching patrols’ effectiveness based on outcome (i.e., change in hunting pressure) rather than effort (e.g., kilometres patrolled) or output (e.g., arrests). However, there has been no report to date of a protected area successfully using an acoustic grid to explore baseline levels of gun hunting activity, adapting its patrols in response to the evidence extracted from the acoustic data and then evaluating the effectiveness of the new patrol strategy. We report here such a case in Cameroon’s Korup National Park, where anti-poaching patrol effort was markedly increased in the 2015–2016 Christmas/New Year holiday season to curb the annual peak in gunshots recorded by a 12-sensor acoustic grid in the same period during the previous 2 years. Despite a three- to five-fold increase in patrol days, distance and area covered, the desired outcome – lower gun hunting activity – was not achieved under the new patrol scheme. The findings emphasize the need for adaptive wildlife law enforcement and how passive acoustic monitoring can help attain this goal, and they warn about the risks of using effort-based metrics of anti-poaching strategies as a surrogate for desired outcomes. We propose ways of increasing protected areas’ capacity to adopt acoustic grids as a law enforcement monitoring tool.
Chapter Two explores how court officials tried to come to terms with Zhu Di’s deep engagement with the steppe and its leaders. Zhu Di’s five steppe campaigns were more than military conflicts. Zhu Di visited the sites – sometimes ruins – of former Yuan palaces and lodges. He offered commentary on the Yuan ruling house, which accentuated his status as successor to the Great Yuan and as a ruler uniquely qualified to pass judgment on fellow sovereigns. Zhu Di’s actions challenged civil officials in many ways. They had to praise a sovereign who openly flouted the founder’s precedents. They celebrated the emperor’s newest subjects, men who drank blood, consumed raw liver, and exulted in physical strength. Court ministers’ writings depicted a style of rulership obviously connected to men from afar in ways that simultaneously satisfied their sovereign’s demands and minimized dangers to the polity and to themselves.
The Conclusion offers observations about what the study’s main findings reveal about Ming rulership and the Ming throne’s place in east Eurasia. It argues that the Ming throne actively sought allies in Eurasia through political patronage, economic support, and a rhetoric that highlights the ties of good faith and loyalty between the emperor and Mongol nobles at home and abroad. The Conclusion also briefly critiques New Qing History exceptionalism, suggesting that the Ming throne’s engagement in Eurasia is one chapter in a far longer story of China’s deep ties to neighboring polities.
Using the unusually rich historical sources generated by the Tumu crisis, Chapter Four offers a reconstruction of Ming rulership in east Eurasia in the mid-fifteenth century. Chapter Four demonstrated that the fifteenth century’s first half saw a multigenerational, multifaceted competition among Mongol, Oirat, and Ming ruling elites to turn the Chinggisid legacy to their advantage. Each developed a genealogy or pedigree of rulership, which it advertised to its neighbors. The best-documented example, that of the Ming dynastic house, trumpeted the superior attributes of the rulership of Zhu Yuanzhang and his descendants. Just as emphatically, the Ming throne denied the qualifications of rival lords such as Toqto’a-Buqa and Esen. The Ming ruling family and its close supporters tried to persuade several audiences, including Jurchen chieftains, the Choson throne, and Oirat and Mongol leaders, of its historical vision of the past and the present.
Chapter Three is a group biography of Mongols in the early Ming throne’s service. Zhu Di and his advisers depicted Esen-Tügel’s decision to join the Ming dynasty in 1423 as a submission, which proved Zhu Di’s superior attributes of rulership. The emperor’s martial prowess, munificence, and ability to recognize men of outstanding ability regardless of their origin won the allegiance and service of a proven Mongol warrior and leader. As was often the case, this dramatic moment – an oath of personal fealty – commanded chroniclers’ attention, but the bigger story had yet to unfold. Imperial patronage continued for much of the remainder of the fifteenth century. It took material form in housing, wages, and personal gifts. It also came in the guise of tax exemptions, prestigious titles and posts, opportunities for advancement, and the throne’s conspicuous protection. Successive emperors displayed their favor through material, financial, political, and honorific means. Such patronage extended to hundreds of Mongolian men, their families, and their descendants for decades and decades. Men from afar embraced this face of rulership. At the same time, it was a pattern of behavior that many civil officials rejected, in part because they felt that such generosity came at their expense.
The introduction discusses the core issues and organization of the book. It argues that despite long-standing stereotypes about Chinese isolation, the Ming court was fully engaged in foreign relations in Eurasia and that relations with Mongol nobles in particular figure prominently in the perception and representation of Ming emperors’ identity and style of rulership.
Zhu Di’s experience as imperial prince shaped his rule’s style and substance. He interacted with Mongolian men as subordinates, advisers, allies, negotiating partners, rivals, and traitors. He was known among them as Lord of Yan. Breaking with his father’s example, Zhu Di repeatedly campaigned in person on the steppe as emperor. There he met with steppe leaders, hosted banquets, conducted grand hunts, and organized vast military reviews. He spoke openly of his motives and objectives on the steppe, not just to audiences at home but also with Korean, Jurchen, Mongol, Moghul, and Timurid leaders. He inserted himself into a Chinggisid world as east Eurasia’s premier ruler and patron.