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Long-term monitoring of cycles in Clethrionomys rutilus in the Yukon boreal forest

Integrative Zoology 2024年第1期19卷 27-36页

作者： Charles j.KREBS Alice j.KENNEY B.Scott GILBERT rudy BOONSTRA Department of Zoology University of British ColumbiaVancouverBritish ColumbiaCanada Renewable Resources Management Program Yukon UniversityWhitehorseYukonCanada Department of Biological Sciences University of Toronto ScarboroughTorontoOntarioCanada

Baseline studies of small rodent populations in undisturbed ecosystems are *** report here 50 years of mon-itoring and experimentation in Yukon of a dominant rodent species in the North American boreal forest,the red-backed vole Clethrionomys *** voles breed in summer,weigh 20–25 g,and reach a maximum density of 20 to 25 per *** populations have shown consistent 3–4-year cycles for the last 50 years with the only change being that peak densities averaged 8/ha until 2000 and 18/ha since that *** the last 25 years,we have measured food resources,predator numbers,and winter weather,and for 1-year social interactions,to estimate their contribution to changes in the rate of summer increase and the rate of overwinter *** these potential limiting factors could contribute to changes in density,and we measured their relative contributions statistically with multiple *** rate of winter decline in density was related to both food supply and winter *** rate of summer increase was related to summer berry crops and white spruce cone *** measure of predator numbers was related to winter or summer changes in vole *** was a large signal of climate change effects in these *** is no density dependence in summer population growth and only a weak one in winter population *** of our results provide a clear understanding of what generates 3–4-year cycles in these voles,and the major missing piece may be an understanding of social interactions at high density.

关键词： boreal forest climate change density dependence population cycles predation winter severity

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Brain Injury Biomechanics and Abusive Head Trauma

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journal of Forensic Science and Medicine 2018年第2期4卷 91-100页

作者： rudy j.castellani Carl j Schmidt Center for Neuropathology Western Michigan University Homer Stryker MD School of MedicineKalamazoo Department of Pathology University of Maryland School of MedicineBaltimoreMDUSA Department of Pathology University of MichiganAnn ArborMichigan

Contemporary biomechanical theory of traumatic brain injury has its foundation in Holbourn’s thesis on shear strain and Ommaya’s primate experimentation demonstrating the role of rotation in a variety of lesions including subdural hematoma(SDH)and diffuse axonal *** human observations have since confirmed,for the most part,the early *** concerns regarding primate research,however,have prompted in vitro models,which in turn has led to challenges with respect to the correlation between in vitro observations and the clinical *** these challenges,medicolegal proceedings may call upon biomechanical engineers to reconstruct complex injury scenarios and offer opinions on the scientific plausibility of clinical disease states,such as SDH,hemorrhagic retinopathy,and cerebral edema,associated with hypothetical or proffered action sequences during the course of an unwitnessed *** is important to note,however,that in vitro models by their nature are low‑evidence quality studies that attempt to advance hypotheses but do not address cause and *** a whole,biomechanical models,as they pertain specifically to the brain and spine,are mathematically ***,endpoints of limited relevance are relied upon(e.g.,skull fracture thresholds),which predictably overestimate the in vivo risk of significant *** the increasing role of biomechanical engineering in the interpretation of fatal pediatric head trauma,a heightened awareness of the limitations warranted.

关键词： Abusive head trauma biomechanics brain injury impact subdural hematoma

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Homicidal Abuse of Young Children:A Historical Perspective

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journal of Forensic Science and Medicine 2017年第2期3卷 97-110页

作者： rudy j.castellani joyce L dejong Carl j Schmidt Department of Pathology Western Michigan University Homer Stryker M.D.School of MedicineKalamazoo Department of Pathology Wayne County Medical ExaminerUniversity of MichiganDetroitMlUSA

The past 50 years has seen a heightened awareness of abusive injury patterns and increased concern for the plight of children victimized by their *** of the young,however,has been embedded in society since the beginning of recorded ***,nature provides abundant examples of infanticide in lower animals,raising the question of whether exploitation,apathy,and violence toward children are on some level evolutionarily *** human antiquity,selective killing of females,the illegitimate,and the malformed,killing by ritualistic sacrifice or to conserve resources was carried out with *** middle ages and later saw a decline in these practices albeit *** hundred years into the industrial revolution,with harsh child labor in public view,legal remedies were sought to protect children but with little *** domestic abuse of children was not addressed until a pivotal 19^(th)-century case,in which the rights of animals were invoked to intervene on behalf of a *** the 20th century,physicians began to look closely at anatomical findings;patterns due to trauma,especially inflicted trauma,began to emerge.“Battered child syndrome”was followed by“shaken baby syndrome”,the latter prompted by the recurrent findings of subdural hematoma,retinal hemorrhages,and brain injury with the absence of impact injuries and no plausible accidental or natural disease *** the 21st century,high-quality studies and an emphasis on evidenced-based medicine substantiated the existence ofiiijury patterns resulting from homicidal ***,progress has been uneven.A case of child abuse that reached the US Supreme Court resulted in an ill-cited dissent that seems to have amplified an already toxic medicolegal environment,perhaps *** difficulties in balancing the welfare of society with that of caregivers in the aftermath of homicidal abuse will no doubt continue.

关键词： Abusive head trauma child abuse homicide infanticide

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Is Rotational Trauma the Only Relevant Pathogenic Mechanism in Hemorrhagic Retinopathy of Shaken Baby Syndrome?

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journal of Forensic Science and Medicine 2018年第2期4卷 104-107页

作者： BS Arushi Tripathy Stephanie Dean DO joyce L de jong Carl j Schmidt rudy j.castellani Department of Pathology Western Michigan University Homer Stryker MD School of MedicineKalamazoo Office of the Chief Medical Examiner BaltimoreMaryland Department of Pathology University of MichiganDetroitMichiganUSA

The pathogenesis of ocular hemorrhage in abusive head trauma/shaken baby syndrome(AHT/SBS)is *** severe hemorrhagic retinopathy has a robust association with AHT/SBS,mild disease is less *** report the ocular and cerebral findings in an 8‑month‑old girl with spastic torticollis who presented following confessed,violent sagittal plane acceleration‑deceleration with *** revealed subdural hemorrhage over the convexities,ischemic brain injury,and preexisting *** examination showed extensive but unilateral retinal hemorrhage,extending broadly to the ora serrata,with perimacular retinal folds and *** retina of the right globe was entirely *** findings in this case,suggest that movement of the globe within the orbit with acceleration‑deceleration,in this case greater on one side due to torticollis,may be the primary factor for severe hemorrhagic retinopathy associated with AHT/*** findings argue against putative global mechanisms,such as intracranial hypertension.

关键词： Abusive head trauma forensic neuropathology forensic science hemorrhagic retinopathy retinal hemorrhage retinoschisis shaken baby syndrome

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Impact of climate change on the small mammal community of the Yukon boreal forest

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Integrative Zoology 2019年第6期14卷 528-541页

作者： Charles j.KREBS rudy BOONSTRA BScott GILBERT Alice j.KENNEY Stan BOUTIN Department of Zoology University of British ColumbiaVancouverBritish ColumbiaCanada Department of Biological Sciences University of Toronto ScarboroughTorontoOntarioCanada Renewable Resources Management Program Yukon CollegeWhitehorseYukonCanada Department of Biological Sciences University of AlbertaEdmontonAlbertaCanada

Long-term monitoring is critical to determine the stability and sustainability of wildlife populations,and if change has occurred,*** have followed population density changes in the small mammal community in the boreal forest of the southern Yukon for 46 years with density estimates by live trapping on 3-5 unmanipulated grids in spring and *** community consists of 10 species and was responsible for 9%of the energy flow in the herbivore component of this ecosystem from 1986 to 1996,but this increased to 38%from 2003 to *** mammals,although small in size,are large in the transfer of energy from plants to predators and *** species form the bulk of the *** was a shift in the dominant species from the 1970s to the 2000s,with Myodes rutilus increasing in relative abundance by 22%and Peromyscus maniculatus decreasing by 22%.From 2007 to 2018,Myodes comprised 63%of the catch,Peromyscus 20%,and Microtus species 17%.Possible causes of these changes involve climate change,which is increasing primary production in this boreal forest,and an associated increase in the abundance of 3 rodent predators,marten(Martes americana),ermine(Mustela ermine)and coyotes(Canis latrans).Following and understanding these and potential future changes will require long-term monitoring studies on a large scale to measure metapopulation *** small mammal community in northern Canada is being affected by climate change and cannot remain sta*** will be critically dependent on food-web interactions that are species-specific.

关键词： community change long-term study population cycles trophic dynamics voles

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Impact of rewilding,species introductions and climate change on the structure and function of the Yukon boreal forest ecosystem

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Integrative Zoology 2018年第2期13卷 123-138页

作者： rudy BOONSTRA Stan BOUTIN Thomas S.jUNG Charles j.KREBS Shawn TAYLOR Department of Biological Sciences University of Toronto ScarboroughTorontoOntarioCanada Department of Biological Sciences University of AlbertaEdmontonAlbertaCanada Department of Environment Government of YukonWhitehorseYukonCanada Department of Zoology University of British ColumbiaVancouverBritish ColumbiaCanada

Community and ecosystem changes are happening in the pristine boreal forest ecosystem of the Yukon for 2 ***,climate change is affecting the abiotic environment(temperature,rainfall and growing season)and driving changes in plant productivity and predator-prey ***,simultaneously change is occurring because of mammal species reintroductions and *** key ecological question is the impact these faunal changes will have on trophic *** productivity in the boreal forest is increasing because of climatic warming,but plant species composition is unlikely to change significantly during the next 50-100 *** 9-10-year population cycle of snowshoe hares will persist but could be reduced in amplitude if winter weather increases predator hunting *** rodents have increased in abundance because of increased vegetation *** ground squirrels have disappeared from the forest because of increased predator hunting efficiency associated with shrub *** have occurred for 2 reasons:human reintroductions of large ungulates and natural recolonization of mammals and birds extending their geographic *** deliberate rewilding of wood bison(Bison bison)and elk(Cervus canadensis)has changed the trophic structure of this boreal ecosystem very *** natural range expansion of mountain lions(Puma concolor),mule deer(Odocoileus hemionus)and American marten(Martes americana)should have few ecosystem *** potential changes will require long-term monitoring studies and experiments on a scale we rarely deem *** affected by climate change,species reintroductions and human alteration of habitats cannot remain stable and changes will be critically dependent on food web interactions.

关键词： community stability introduced species population cycles trophic dynamics

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作者： Chiappini rudy.

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Origin of raptorial feeding in juvenile euarthropods revealed by a Cambrian radiodontan

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National Science Review 2018年第6期5卷 863-869页

作者： jianni Liu rudy Lerosey-Aubril Michael Steiner jason A. Dunlop Degan Shu john R. Paterson Shaanxi Key Laboratory of Early Life and Environment The Key Laboratory of Continental DynamicsDepartment of Geology Northwest University Palaeoscience Research Centre School of Environmental and Rural ScienceUniversity of New England Institut für Geologische Wissenschaften 4. Museum für Naturkunde Leibniz Institute for Evolution and Biodiversity Science

The rapid rise of arthropods during the Cambrian quickly established some clades, such as the euarthropod stem-group called Radiodonta, as the dominant and most diverse predators in marine ecosystems. Recent discoveries have shown that the size and dietary ecology of radiodontans are far more diverse than previously thought, but little is known about the feeding habits of juveniles. Here, we document a very small(～18-mm-long), near-complete specimen of the radiodontan Lyrarapax unguispinus from the early Cambrian Chengjiang Biota of China. This specimen is the smallest radiodontan individual known,representing a juvenile instar. Its adult-like morphology—especially the fully developed spinose frontal appendages and tetraradial oral cone—indicates that L. unguispinus was a well-equipped predator at an early developmental stage, similar to modern raptorial euarthropods, such as mantises, mantis shrimps and arachnids. This evidence, coupled with the basal phylogenetic position of radiodontans, confirms that raptorial feeding habits in juvenile euarthropods appeared early in the evolutionary history of the group.

关键词： Lyrarapax Radiodonta Arthropoda Cambrian predation feeding ecology

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Construction of Dry Cover System for Prevention of Acid Mine Drainage at Mine Waste Dump in Open Cast Coal Mines, Indonesia

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journal of Environmental Protection 2016年第2期7卷 160-169页

作者： Shinji Matsumoto Hideki Shimada Takashi Sasaoka Ginting j. Kusuma rudy S. Gautama Department of Earth Resources Engineering Kyushu University Fukuoka Japan Department of Mining Engineering Institute Technology Bandung Bandung Indonesia

Acid Mine Drainage (AMD) which occurs when sulfide minerals are exposed to water and oxygen with an excavation is one of the serious environmental problems in the world. A dry cover system is generally constructed in waste dump for the prevention of AMD in Indonesia by virtue of low cost and availability of waste rocks for a cover layer. However, the failure of the system caused by the lack of information related to the construction of cover system in mines, which leads to AMD, has been reported recently in Indonesia. In this study, the field investigation was conducted in pit and waste dump in open cast coal mine in Indonesia with the aim of obtaining the information on the construction of a cover layer and backfilling conditions of waste rocks in the waste dump. The rock samples taken in two areas of the mine were analyzed by geochemical analysis and sequential extraction with acids. The results indicated that Net Acid Producing Potential (NAPP) of the rocks in the waste dump down to 100 cm depth in both areas was from 10 to 30 kg H2SO4/ton, suggesting that Potentially Acid Forming (PAF) was backfilled in a cover layer. The backfill of PAF was contrary to the concept of cover system, which caused the failure of constructing a cover layer. The cause of the failure was likely attributed to the shortage of cover rocks which are classified as Non Acid Forming (NAF) or the failure of proper placement of them by an operational problem in the areas. Moreover, the results of the extraction with acids suggested that the form of iron and sulfur has to be taken into account to discuss the occurrence of AMD.

关键词： Acid Mine Drainage (AMD) Dry Cover System Open Cast Coal Mine Indonesia

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Capillary electrophoresis tandem mass spectrometry in the analysis of 10 opiates in 10 nanoliters of sample

Capillary electrophoresis tandem mass spectrometry in the an...

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30th International Symposium on Capillary Chromatography、4th GC×GC Symposium、16th National Symposium and Exhibition on Chromatography,i.e. 1st Dalian International Symposium and Exhibition on Chromatography

作者： Uboh,CE. Soma,LR. rudy,j. PA Equine Toxicology & Research Center 220 East Rosedale Ave West ChesterPA 19382 and University of Pennsylvania School of Veterinary Medicine.New Bolton Center Campus382 West Street RoadKennett SquarePA 19348

Opiates are widely used in the management of pain and thus,can be abused leading to drug *** use in the management of pain has also lead to abuse in an attempt to allow the athlete,whether human or horse, to compete despite unsuitable physical conditions.A horse competing under these conditions is especially dangerous for the equine athlete and the jockey or driver.A horse tumbling to the ground while running in excess of 35 mph can be devastating to both the horse and human *** most troubling part is that these agents have been illegally administered to horses to alter their *** deter such illegal use of opiates in racehorses,sensitive methods for screening and confirmation of these agents are essential.A method to address this need is the use of capillary electrophoresis(CE)coupled with tandem mass spectrometry(MS). The advantages of this method are accuracy,high efficiency,sensitivity,selectivity,small sample size and high resolution ***(MOR),codeine(COD),dihydrocodeine(DHC),norcodeine(NCOD),normorphine (NMOR),dihydromorphine(DMOR),diacetylmorphine(DHM),ethylmorphine(EMOR),6-monoacetylmor- phine(6-MAM)and hordenine(HOR)were selected as the target *** were recovered from plasma by liquid-liquid extraction(LLE).To 1.0 mL sample,equal volume of 0.1M borate buffer(pH 10)and 5.0 mL dichloromethane(DCM)were added and mixed for 3 min before centrifugation at 3000 rpm for 15min. The organic layer was transferred into a glass tube,added 2 drops of 2 M acetic acid in ethyl acetate and evaporated to dryness at 45℃ under *** residue was reconstituted in 50 L 20 mM ammonium acetate and 20 mM acetic *** was performed on a PACE/MDQ integrated with a Finnigan LCQDuo tandem mass spectrometer using a Polymicron bare fused-silica capillary(80 cm×50 m,i.d.)of which 15-20 mm portion of the polyimide coating was removed from the outlet end of the capillary to help maintain a stable *** buf

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