关键词： Prey choice   Food selection   Stable isotope analysis   Over-invasions   MixSIAR   Functional equivalence   Trophic niche  

摘要： North American cambarid crayfish have been highly successful in establishing and spreading across Europe and are now over-invading earlier arrivals in many water bodies. Parthenogenetic marbled crayfish (Procambarus virginalis), which originated from aquarium stocks, are relatively recent invaders and have established in lakes previously invaded by spiny-cheek crayfish (Faxonius limosus). However, the feeding ecology of marbled crayfish and consequential impacts on the non-native species' coexistence are largely unexplored. By combining laboratory experiments with stable isotope analyses of field samples, we were able to (1) determine food preferences of both species under controlled conditions and (2) explore their trophic niches in three lakes where both species co-occur. In the food-choice laboratory experiments, the two species showed similar food preferences and consumption rates. Consistently, the stable isotope analyses (delta C-13 and delta N-15) highlighted the intermediate trophic position of both species. Marbled crayfish and spiny-cheek crayfish occupied a wide range of trophic positions corresponding to a very generalist diet. However, marbled crayfish were more relying on arthropod prey than spiny-cheek crayfish which fed more on mollusks. This is the first work providing evidence for trophic plasticity of marbled crayfish in lake food webs. Our results suggest that the addition of marbled crayfish increases grazing pressure on macrophytes and macrophyte-dependent organisms and the allochthonous detritus decomposition in ecosystems already invaded by spiny-cheek crayfish. Since both species are listed as invasive alien species of EU concern, further assessments of potentially endangered food organisms are needed.

关键词： Winter ecology   Habitat   Striped bass   Acoustic tracking   Migrations  

摘要： Winter habitat selection by Striped Bass (Morone saxatilis) has been described as opportunistic, but due to the length and severity of winter at its northern range, winter habitats in the north are predicted to be restricted in distribution and carefully selected. Here we describe the locations and environmental conditions supporting winter aggregations of adult Striped Bass including periods under ice cover in the Saint John River, New Brunswick using acoustic telemetry. Striped Bass of both Saint John River (72%) and other ancestry (28%) were observed to overwinter within the river's four mainstem lakes and embayments to which the individuals returned each fall. Most non-Saint John River ancestry Striped Bass were observed in habitats nearest the river mouth in winter. Striped Bass travelled to winter habitats from fall feeding locations from October to November, and only four tagged individuals departed the river at this time. Temperature, dissolved oxygen, and salinity conditions best described the winter habitats. By demonstrating the non-random distribution of Striped Bass during winter and identifying a gradient of habitat use by Saint John River ancestry Striped Bass in this northern river system, it is apparent that protection of these locations is critical for the long term conservation of Striped Bass populations in Canada.

关键词： Inner Mongolian Grassland   Landscape sustainability science   Climate change   Grazing  

摘要： Context Understanding the ecology and sustainability of the Inner Mongolian Grassland is crucial for improving land management policies in the Mongolian Plateau and beyond. However, a systematic and comprehensive review of the relevant literature is still lacking. Objectives This review was intended to: (1) assess the current state of the ecological and sustainability research of the Inner Mongolian Grassland region, and (2) identify critical research topics and challenges for understanding pathways to sustainability of the region. Methods We conducted a bibliometric analysis of 2571 English articles indexed in the Web of Science during 1998-2019. Multiple methods, including descriptive statistics, principal component analysis, change point detection, theme mining, and association strength analysis, were combined to analyze the sampled literature. Results All reviewed studies can be grouped into four types: description of ecological and biogeochemical characteristics of degraded grasslands (type I), the impacts of climate change and human activities on aboveground (type II) and belowground grassland ecosystem functioning (type III), and the impacts of different management strategies on grassland ecosystem services and human well-being (type IV). The number of publications in all four themes has rapidly increased after 2007-2009. The four types of articles were related to each other in terms of the interannual publication consistency. Keyword co-occurrence network analysis showed that climate change and grazing were the major research topics, which are closely related to all other topics. Conclusions Three perspectives have persisted in the ecology and sustainability research of the Inner Mongolian Grassland: Ecology in the Grassland, Ecology of the Grassland, and Sustainability of the Grassland. Based on the emerging landscape sustainability science framework, the transdisciplinary approach to landscape sustainability diagnostics and landscape planning and design sh

关键词： Human disturbances   Lead contamination   Poisoning   Scavenger conservation   Threats   Vultures  

摘要： While scientific knowledge is consistently increasing for several species of conservation concern, mitigating their population declines continues to be a great challenge globally. This is the case of the Andean condor (Vultur gryphus) in South America. Scientific information on this species has increased steeply in the last years, but their population declines continue. Here, we review and analyze the scientific information available about Andean condors ecology with implications for its conservation. We also evaluate published and unpublished information about the different threats affecting their populations. Finally, we propose conservation actions based on acquired scientific knowledge, which should be of help for conservation managers and policy makers. The increase in scientific information on this species was mainly focused on subject areas as key habitats for roosting and breeding, food sources, intra and interspecific interaction, human-condor relationships, movement ecology, genetic composition, and health information. Worryingly, good demographic information is still lacking (e.g., population density, breeding success, age and sex-specific survival rates) which prevents the assessment of the population viability. The most important threats affecting condor populations that require urgent actions are poisoning with pesticides and lead contamination. Illegal shooting, impacts produced by human infrastructure and cultural threats are other threats affecting this species. There is not much scientific information on the potential effects of veterinary drugs ingestion, impacts of carnivore traps, pathogen microorganisms and disturbances produced by tourism or climbing activities. Importantly, the actual population impacts of most of the mentioned threats are still unknown. Although some basic ecological studies are still needed (e.g., demography), conservation policies should incorporate scientific knowledge acquired in the last years to produce better results

关键词： Case study   Policy ecology   Race and ethnicity  

摘要： Although the literature is growing regarding large-scale, system-wide implementation programs, the broader political and social contexts, including race and ethnicity, are frequently ignored. Using the Policy Ecology of Implementation framework (Raghavan et al., Implement Sci 3:26, 2008), Minnesota's CEMIG is examined to investigate the role of social and political contexts in the implementation process and the barriers they create. Data from 22 interview transcripts from DHS administrators, agency grant managers, university educators, advocacy group representatives, and mental health board members, along with more than 1000 grant documents were qualitatively analyzed using content analysis to reveal three themes concerning how the participants experienced program implementation: invisibility, isolation, and inequity. Findings demonstrate the participants perceived that the grant program perpetuated inequities by neglecting to promote the program, advocate for clinicians of color, and coordinate isolated policy ecology systems. Strategies for future large-scale, system-wide mental health program implementation are provided.

关键词： life histories   longitudinal research   plant–   animal interactions   reproductive strategies   sensory ecology   social relationships  

摘要： Research on non-human primates in the endangered tropical dry forest of Sector Santa Rosa (SSR), area de Conservacion Guanacaste (ACG), was launched in 1983 and is now one of the longest running studies of primates globally. Such continuous study provides a rare opportunity to ask questions that are only answerable through decades-long monitoring of these long-lived monkeys. In turn, the mounting data generated by long-term study, including knowledge of lifetime reproductive success, familial relatedness, comprehensive behavioral and dietary repertoires, and patterns of inter- and intra-annual variation in forest productivity, provide diverse opportunities to researchers, and facilitate studies that are of shorter duration. Here, we review some of the contributions of our longitudinal research on white-faced capuchins and Geoffroy's spider monkeys, together with newer studies on mantled howler monkeys. We begin by synthesizing findings from our research on demography, dispersal, social relationships, and reproduction. These life history and social traits interact with their foraging and sensory ecology, which we review next. We end by highlighting how the longitudinal study of primates in Sector Santa Rosa has made direct and indirect contributions to the conservation of the critically endangered dry forest biome and its inhabitants, as well as to education, community, and forest restoration initiatives. In particular, we focus our review on how long-term research is uniquely positioned to make key contributions spanning different topical areas. in Spanish is available with online material.

关键词： Sleep   Infants   Toddlers   Cross-cultural   Sleep ecology   Sleep patterns  

摘要： Objective: The purpose of this study was to examine differences in reported sleep patterns (eg, sleep onset, nocturnal sleep duration, nocturnal wakefulness) and aspects of sleep ecology (eg, sleeping arrangements), in a sample of young children, between two cultural groups in Israel: Arab and Jewish. Method: Mothers of 497 healthy, typically developing infants and toddlers, ranging in age from 3 to 36 months, participated in the study: 253 of the mothers were Arab and 244 were Jewish. The mothers were asked to complete the Brief Infant Sleep Questionnaire a well-validated questionnaire of early childhood sleep patterns. Mothers also completed a demographic questionnaire. Results: Substantial cross-cultural differences in reported sleep patterns were found between Arab and Jewish children. Arab children, compared to Jewish children, had later bedtimes, shorter overall night duration, and longer periods of nocturnal wakefulness. Furthermore, Arab mothers perceived their children's sleep as more problematic than did Jewish mothers. Arab families were more likely to room share, with higher rates of maternal involvement at bedtime. Sleep onset played an important role in predicting nighttime sleep in Arab children;in the Jewish group, nighttime sleep was linked to parental proximity and assistance at bedtime. Conclusion: The findings emphasize the importance of deepening the understanding regarding the role of culture in infants sleep patterns. This will enable health care professionals to attune their interventions to the specific cultural context. Further studies are needed to understand the basis and impacts of these cultural differences. (c) 2020 Elsevier B.V. All rights reserved.

关键词： bearded eelpout Hadropogonichthys lindbergi   Zoarcidae   stages of gonads maturity   Kuril Islands  

摘要： New data on the biology and ecology of a rare species, bearded eelpout Hadropogonichthys lindbergi (Zoarcidae), in the Pacific waters of the middle Kuril Islands are presented. The list of species of the community, which includes the eelpout, is given. Captures of H. lindbergi were recorded in the depth range of 290-440 m at a temperature of 2.2-3.0 degrees C. The maximum length and weight have been specified: 43 cm and 180 g. Individual fertility is 96-117 eggs. A description of the stages of maturity of the sex glands of males and females is given. Sexual maturity occurs at a body length of 37-38 cm. It is assumed that the reproduction of the eelpout takes place in the fall.