The Spot-billed Pelican(Pelecanus philippensis),a near threatened bird and one of eight pelican species in the world,can be found only in South and Southeast Asia over an area between 129000 and 181000 km 2 with stron...The Spot-billed Pelican(Pelecanus philippensis),a near threatened bird and one of eight pelican species in the world,can be found only in South and Southeast Asia over an area between 129000 and 181000 km 2 with strongholds in India,Sri Lanka,southern Cambodia and coastal areas of Sumatra.In India,it is presently distributed in southern and northeastern India with concentrations in Andhra Pradesh,Tamil Nadu,Karnataka and Assam states.An ethogram of the Spot-billed Pelican was presented and as many as 25 individual behaviors grouped under nine different categories were described:resting,alert,comfort/maintenance,locomotion,foraging,antagonistic,sexual,chick care and foraging,and vocalizations.Descriptions of behaviors of the Spot-billed Pelican in this paper would be immensely useful while preparing conservation and management plan for the species present both in the captive and wild condition.展开更多
The breeding biology of the Spot-billed Pelican(Pelecanus philippensis)was investigated from September 2007 to September 2010 in Karaivetti Lake,Tamil Nadu,India.The Spot-billed Pelican breeds between November and Apr...The breeding biology of the Spot-billed Pelican(Pelecanus philippensis)was investigated from September 2007 to September 2010 in Karaivetti Lake,Tamil Nadu,India.The Spot-billed Pelican breeds between November and April at the Karaivetti Lake.It also breeds roughly during the same period at other breeding sites in Tamil Nadu,except for the Vedanthangal and Karikili bird sanctuaries,where pelicans arrives much earlier and their breeding activities start and end to some extent ahead of the other sites,i.e.,from September to March.In essence,the breeding season starts after the onset of the northeast monsoon in Tamil Nadu.A few days after their arrival,pelicans perform courtship display,form pairs,start nest construction and lay eggs.Courtship display is not as attractive and impressive as in other waterbirds.The clutch size varies from two to three eggs and the incubation period from 25 to 36 days.The fledging period varies from a minimum of 90 to a maximum of 102 days.The nest success rate of the Spot-billed Pelican at Karaivetti was 90.28% during the study period.展开更多
Literature on spot-billed pelican has not been reviewed lately which could provide a critique of the emerging data. We have now chosen it as a key species through which we suggest a conservation action plan which will...Literature on spot-billed pelican has not been reviewed lately which could provide a critique of the emerging data. We have now chosen it as a key species through which we suggest a conservation action plan which will benefit several waterbird species. The information provided here is scholastic in nature and is meant to focus on aspects that require attention and help plan future work for applied conservation. All known information on this species is brought together in this review which will also provide an update of its biology. Notes on the breeding biology of the species first published in the Journal of the Bombay Natural History Society. So far, 380 works have appeared on the species; of these, 36 contain material reported in earlier works or appeared as papers subsequently. Most appeared as articles in journals, both national and regional, a few international journals, newsletters/bulletins (48.2%), 4 dissertations, 76 reports and 6 popular science articles in magazines. This review on the species will provide an insight into different factors that can be weighed and combined while making a decision in investing resources in species conservation, i.e. importance of the species, level of threat and the time frame over which results are to be achieved.展开更多
《新塘鹅英国文学指南》(The New Peli-can Guide to English Literature)是在1954年初次出版的《塘鹅英国文学指南》(The Peli-can Guide to English Literature)的基础上,经过十五次重印,于1982年大事增订修改后出版的一套新书。目前...《新塘鹅英国文学指南》(The New Peli-can Guide to English Literature)是在1954年初次出版的《塘鹅英国文学指南》(The Peli-can Guide to English Literature)的基础上,经过十五次重印,于1982年大事增订修改后出版的一套新书。目前,这套丛书在英国销路很畅。展开更多
Rock bursts represent a formidable challenge in underground engineering,posing substantial risks to both infrastructure and human safety.These sudden and violent failures of rock masses are characterized by the rapid ...Rock bursts represent a formidable challenge in underground engineering,posing substantial risks to both infrastructure and human safety.These sudden and violent failures of rock masses are characterized by the rapid release of accumulated stress within the rock,leading to severe seismic events and structural damage.Therefore,the development of reliable prediction models for rock bursts is paramount to mitigating these hazards.This study aims to propose a tree-based model—a Light Gradient Boosting Machine(LightGBM)—to predict the intensity of rock bursts in underground engineering.322 actual rock burst cases are collected to constitute an exhaustive rock burst dataset,which serves to train the LightGBMmodel.Two population-basedmetaheuristic algorithms are used to optimize the hyperparameters of the LightGBM model.Finally,the sensitivity analysis is used to identify the predominant factors that may incur the occurrence of rock bursts.The results show that the population-based metaheuristic algorithms have a good ability to search out the optimal hyperparameters of the LightGBM model.The developed LightGBM model yields promising performance in predicting the intensity of rock bursts,with which accuracy on training and testing sets are 0.972 and 0.944,respectively.The sensitivity analysis discloses that the risk of occurring rock burst is significantly sensitive to three factors:uniaxial compressive strength(σc),stress concentration factor(SCF),and elastic strain energy index(Wet).Moreover,this study clarifies the particular impact of these three factors on the intensity of rock bursts through the partial dependence plot.展开更多
基金Trichy-1 for academic support throughout the studythe Department of Science and Technology (SERCFasttrack Young scientist Scheme),India for fundingthe Tamil Nadu Forest Department for granting me the required permission.
文摘The Spot-billed Pelican(Pelecanus philippensis),a near threatened bird and one of eight pelican species in the world,can be found only in South and Southeast Asia over an area between 129000 and 181000 km 2 with strongholds in India,Sri Lanka,southern Cambodia and coastal areas of Sumatra.In India,it is presently distributed in southern and northeastern India with concentrations in Andhra Pradesh,Tamil Nadu,Karnataka and Assam states.An ethogram of the Spot-billed Pelican was presented and as many as 25 individual behaviors grouped under nine different categories were described:resting,alert,comfort/maintenance,locomotion,foraging,antagonistic,sexual,chick care and foraging,and vocalizations.Descriptions of behaviors of the Spot-billed Pelican in this paper would be immensely useful while preparing conservation and management plan for the species present both in the captive and wild condition.
基金India for funding the studythe Tamil Nadu Forest Department for granting me the required permission
文摘The breeding biology of the Spot-billed Pelican(Pelecanus philippensis)was investigated from September 2007 to September 2010 in Karaivetti Lake,Tamil Nadu,India.The Spot-billed Pelican breeds between November and April at the Karaivetti Lake.It also breeds roughly during the same period at other breeding sites in Tamil Nadu,except for the Vedanthangal and Karikili bird sanctuaries,where pelicans arrives much earlier and their breeding activities start and end to some extent ahead of the other sites,i.e.,from September to March.In essence,the breeding season starts after the onset of the northeast monsoon in Tamil Nadu.A few days after their arrival,pelicans perform courtship display,form pairs,start nest construction and lay eggs.Courtship display is not as attractive and impressive as in other waterbirds.The clutch size varies from two to three eggs and the incubation period from 25 to 36 days.The fledging period varies from a minimum of 90 to a maximum of 102 days.The nest success rate of the Spot-billed Pelican at Karaivetti was 90.28% during the study period.
文摘Literature on spot-billed pelican has not been reviewed lately which could provide a critique of the emerging data. We have now chosen it as a key species through which we suggest a conservation action plan which will benefit several waterbird species. The information provided here is scholastic in nature and is meant to focus on aspects that require attention and help plan future work for applied conservation. All known information on this species is brought together in this review which will also provide an update of its biology. Notes on the breeding biology of the species first published in the Journal of the Bombay Natural History Society. So far, 380 works have appeared on the species; of these, 36 contain material reported in earlier works or appeared as papers subsequently. Most appeared as articles in journals, both national and regional, a few international journals, newsletters/bulletins (48.2%), 4 dissertations, 76 reports and 6 popular science articles in magazines. This review on the species will provide an insight into different factors that can be weighed and combined while making a decision in investing resources in species conservation, i.e. importance of the species, level of threat and the time frame over which results are to be achieved.
文摘《新塘鹅英国文学指南》(The New Peli-can Guide to English Literature)是在1954年初次出版的《塘鹅英国文学指南》(The Peli-can Guide to English Literature)的基础上,经过十五次重印,于1982年大事增订修改后出版的一套新书。目前,这套丛书在英国销路很畅。
文摘Rock bursts represent a formidable challenge in underground engineering,posing substantial risks to both infrastructure and human safety.These sudden and violent failures of rock masses are characterized by the rapid release of accumulated stress within the rock,leading to severe seismic events and structural damage.Therefore,the development of reliable prediction models for rock bursts is paramount to mitigating these hazards.This study aims to propose a tree-based model—a Light Gradient Boosting Machine(LightGBM)—to predict the intensity of rock bursts in underground engineering.322 actual rock burst cases are collected to constitute an exhaustive rock burst dataset,which serves to train the LightGBMmodel.Two population-basedmetaheuristic algorithms are used to optimize the hyperparameters of the LightGBM model.Finally,the sensitivity analysis is used to identify the predominant factors that may incur the occurrence of rock bursts.The results show that the population-based metaheuristic algorithms have a good ability to search out the optimal hyperparameters of the LightGBM model.The developed LightGBM model yields promising performance in predicting the intensity of rock bursts,with which accuracy on training and testing sets are 0.972 and 0.944,respectively.The sensitivity analysis discloses that the risk of occurring rock burst is significantly sensitive to three factors:uniaxial compressive strength(σc),stress concentration factor(SCF),and elastic strain energy index(Wet).Moreover,this study clarifies the particular impact of these three factors on the intensity of rock bursts through the partial dependence plot.