Mating behavior and parturition are important components in the life history of any species. The endangered Chinese crocodile lizard(Shinisaurus crocodilurus) is suffering dramatic population decreases in the wild. Su...Mating behavior and parturition are important components in the life history of any species. The endangered Chinese crocodile lizard(Shinisaurus crocodilurus) is suffering dramatic population decreases in the wild. Successful captive breeding can provide individuals to be reintroduced into their natural habitat and help to restore the wild populations. Studying the mating behavior and parturition of these lizards in captivity will enable us understand how is this ancient species reproduction and optimize artificial reproduction protocol. We studied the mating behavior and parturition of Chinese crocodile lizards in captivity using video recordings at the Daguishan National Nature Reserve, China, from 2015 to 2017. We analyzed pre-copulation and copulation, which occurred in mid-March to late May from all studied years. Pre-copulation and copulation lasted on average 7.51(n=11) and 27.45(n=11) minutes, respectively. We found that large-bodied male lizards have longer copulation periods, a pattern seen in other lizard species. In the mating event, males always initiated sex, while the females were passive. The duration of parturition lasted 153.8 ± 26.8(n=46) minutes, and larger females had heavier clutches. In addition, even though Chinese crocodile lizards represent an ancient lizard clade with primitive characteristics, they still abide by the reproduction patterns seen in most other lizard species.展开更多
We collected data on habitat use and locomotion of the François’langur(Trachypithecus francoisi)between August 2003 and July 2004 at Nonggang Nature Reserve,China.A total of 739 h of behavioral data were collect...We collected data on habitat use and locomotion of the François’langur(Trachypithecus francoisi)between August 2003 and July 2004 at Nonggang Nature Reserve,China.A total of 739 h of behavioral data were collected during this study.We tested 2 predictions:(1)that the langurs may have special patterns of habitat use and locomotion adaptive to the limestone habitat,and(2)the langurs may exhibit different patterns of habitat use and locomotion among different zones of limestone hill.Our results indicated that François’langurs spent more time in the low-risk,relatively food-poor cliff-hilltop areas.When young leaves and fruit were scarce in the dry season,the langurs increased their time in the high-risk,food-rich valley basin.François’langurs were semi-terrestrial,and leaping and climbing were their main locomotor modes.These behavioral patterns are considered to be related to characteristics of topography and vegetation in limestone habitat,such as large areas of cliff and discontinuous canopy.Our results also supported Prediction 2.The langurs confined locomotion to the main canopy and frequently adopted leaping while traveling in the hillside and valley basin.While traveling in cliff-hilltop areas,they tended to stay in the lower stratus(≤5 m)or move on the ground,and walking and climbing were their dominant traveling modes.展开更多
Ranging behavior is an important aspect of animal behavior that researchers use to investigate ecological influences on individual behavior.We collected data on the ranging behavior of one group of François’lang...Ranging behavior is an important aspect of animal behavior that researchers use to investigate ecological influences on individual behavior.We collected data on the ranging behavior of one group of François’langurs(Trachypithecus francoisi)between August 2003 and July 2004 in a limestone habitat within Nonggang Nature Reserve,China.We evaluated the influences of food availability,water resources and sleeping sites on ranging behavior.During the study period,the total home range size for the study group was 64.5 or(69.3 ha if the lacunae within the borders in which langurs were not observed were included),and the mean daily path length was 541 m.These are well within the range of variation reported in Trachypithecus species.The monthly range size was between 9.8 and 23.3 ha,and monthly range size correlated negatively with young leaf availability.The langurs tended to use a larger range size during young leaf-lean periods.The langurs did not use their home range uniformly,and 74%of their activities occurred within 35%of their home range.The most heavily used quadrats in the home range were located near the most frequently used sleeping sites,suggesting that sleeping sites have a significant influence on the ranging behavior of François’langurs in limestone habitats.展开更多
It is generally accepted that the high phenotypic diversity of mammals is a combined result of developmental constraint and ecological adaptation, although the influence of these endogenous and exogenous factors varie...It is generally accepted that the high phenotypic diversity of mammals is a combined result of developmental constraint and ecological adaptation, although the influence of these endogenous and exogenous factors varies in different mammal groups. The rodent family Sciuridae represents an ideal candidate for examining phenotypic diversity in relation to phylogeny and ecological adaptations. In the present study, we investigate the effects of phylogeny and lifestyle on the skull shape in different species of Sciuridae by applying geometric morphometric methods. In addition, we investigate the importance of allometry on sciurid skull shape, because results from geometric morphometrics sometimes dispute those of traditional morphometry. Here, we identify significant associations between patristic distances obtained from molecular phylogeny and shape distances in all 3 views of the cranium and the lateral view of the mandible. Multivariate regression demonstrates that shape differences among lifestyle categories are substantial, especially in the dorsal and ventral structures after the influence of phylogeny is taken into account. Allometry plays an important role in the shape variation, although its importance on different skull structures varies. Our results indicate that complex structures of this highly diverse mammal group, which occupies different niches, are affected by ecological factors and developmental constraint.展开更多
We collected fecal samples of white-headed langurs from 3 of the 4 remaining habitat fragments(Fa,Fb and CZ)located in southwestern Guangxi,China in Nov 2005,and used 5 microsatellite loci and the SRY gene to assess t...We collected fecal samples of white-headed langurs from 3 of the 4 remaining habitat fragments(Fa,Fb and CZ)located in southwestern Guangxi,China in Nov 2005,and used 5 microsatellite loci and the SRY gene to assess the relatedness between 46 langurs within and between groups.We observed 2 forms of group structure:one-male/multi-female groups(OMGs)and all-male groups(AMGs).One AMG in Fa was composed of 2 generations,included a father,2 sons and 1 unrelated male,and all OMGs in all 3 habitats included 1 resident male,several adult females and offspring.Of the 21 identified father-offspring cases,the resident male fathered 20(95%)and the non-resident male sired 1(5%),suggesting that adult males had overwhelming priority of access to females as the resident male in an OMG,while the non-resident male may also have the opportunity to adopt surreptitious mating strategies.展开更多
Numerical computation plays an important role in the study of differential equations with time-delay,because a simple and explicit analytic solution is usually un available.Time-stepping methods based on discretizing ...Numerical computation plays an important role in the study of differential equations with time-delay,because a simple and explicit analytic solution is usually un available.Time-stepping methods based on discretizing the temporal derivative with some step-size∆t are the main tools for this task.To get accurate numerical solutions,in many cases it is necessary to require∆t<τand this will be a rather unwelcome restriction whenτ,the quantity of time-delay,is small.In this paper,we propose a method for a class of time-delay problems,which is completely meshless.The idea lies in representing the solution by its Laplace inverse transform along a carefully de-signed contour in the complex plane and then approximating the contour integral by the Filon-Clenshaw-Curtis(FCC)quadrature in a few fast growing subintervals.The computations of the solution for all time points of interest are naturally parallelizable and for each time point the implementations of the FCC quadrature in all subintervals are also parallelizable.For each time point and each subinterval,the FCC quadrature can be implemented by fast Fourier transform.Numerical results are given to check the efficiency of the proposed method.展开更多
In this paper,we study a new numerical technique for a class of 2D nonlinear fractional diffusion-wave equations with the Caputo-type temporal derivative and Riesz-type spatial derivative.Galerkin finite element schem...In this paper,we study a new numerical technique for a class of 2D nonlinear fractional diffusion-wave equations with the Caputo-type temporal derivative and Riesz-type spatial derivative.Galerkin finite element scheme is used for the discretization in the spatial direction,and the temporal component is discretized by a new alternating direction implicit(ADI)method.Next,we strictly prove that the numerical method is stable and convergent.Finally,to confirm our theoretical analysis,some numerical examples in 2D space are presented.展开更多
The parareal algorithm,proposed firstly by Lions et al.[J.L.Lions,Y.Maday,and G.Turinici,A”parareal”in time discretization of PDE’s,C.R.Acad.Sci.Paris Ser.I Math.,332(2001),pp.661-668],is an effective algorithm to ...The parareal algorithm,proposed firstly by Lions et al.[J.L.Lions,Y.Maday,and G.Turinici,A”parareal”in time discretization of PDE’s,C.R.Acad.Sci.Paris Ser.I Math.,332(2001),pp.661-668],is an effective algorithm to solve the timedependent problems parallel in time.This algorithm has received much interest from many researchers in the past years.We present in this paper a new variant of the parareal algorithm,which is derived by combining the original parareal algorithm and the Richardson extrapolation,for the numerical solution of the nonlinear ODEs and PDEs.Several nonlinear problems are tested to show the advantage of the new algorithm.The accuracy of the obtained numerical solution is compared with that of its original version(i.e.,the parareal algorithm based on the same numerical method).展开更多
基金financially support by the National Key Research & Development Program of China (2016YFC0503200)the Natural Science Foundation of China (31760623)the Financial Project of State Forestry Administration (V2130211)
文摘Mating behavior and parturition are important components in the life history of any species. The endangered Chinese crocodile lizard(Shinisaurus crocodilurus) is suffering dramatic population decreases in the wild. Successful captive breeding can provide individuals to be reintroduced into their natural habitat and help to restore the wild populations. Studying the mating behavior and parturition of these lizards in captivity will enable us understand how is this ancient species reproduction and optimize artificial reproduction protocol. We studied the mating behavior and parturition of Chinese crocodile lizards in captivity using video recordings at the Daguishan National Nature Reserve, China, from 2015 to 2017. We analyzed pre-copulation and copulation, which occurred in mid-March to late May from all studied years. Pre-copulation and copulation lasted on average 7.51(n=11) and 27.45(n=11) minutes, respectively. We found that large-bodied male lizards have longer copulation periods, a pattern seen in other lizard species. In the mating event, males always initiated sex, while the females were passive. The duration of parturition lasted 153.8 ± 26.8(n=46) minutes, and larger females had heavier clutches. In addition, even though Chinese crocodile lizards represent an ancient lizard clade with primitive characteristics, they still abide by the reproduction patterns seen in most other lizard species.
基金Acknowledgements This study was supported by the National Nature Science Foundation of China (No 30860050), Guangxi Science Foundation (0991095), Monitoring and Conservation of Assamese macaques Project of National Forestry Administration of China, Guangxi Beibu Gulf Serious Specialization of Guangxi Natural Sciences Foundation (2010GXNSFE013004), and Project of Creative Team from Colleges and Universities in Guangxi. We thank the Guangxi Forestry Bureau and Nonggang National Nature Reserve. We also acknowledge the critical comments of two anonymous reviewers.
基金supported by Research Funds of the National Nature Science Foundation of China (No, 30860050), Guangxi Science Foundation (0991095), Foundation of Key Laboratory of Southwest China Wildlife Resources Conservation (Ministry of Education), China West Normal University, Protection and Assessment, Monitoring and Conservation of Langur Project of National Forestry Administration of China, and Guangxi Beibu Gulf Serious Specialisation of Guangxi Natural Sciences Foundation (No. 2010GXNSFE013004). We thank the Guangxi Forestry Bureau, and Fusui Rare Animal Nature Reserve. We thank Dr. Ali Krzton for her assistance with language editing. We also ac- knowledge the critical comments of four anonymous reviewers.
基金financially supported by the National Nature Science Foundation of China(No.30560023,30860050,31172122)the Guangxi Nature Science Foundation(2012GXNSFAA053039)the Monitoring and Conservation of Langur Project of the National Forestry Administration of China.
文摘We collected data on habitat use and locomotion of the François’langur(Trachypithecus francoisi)between August 2003 and July 2004 at Nonggang Nature Reserve,China.A total of 739 h of behavioral data were collected during this study.We tested 2 predictions:(1)that the langurs may have special patterns of habitat use and locomotion adaptive to the limestone habitat,and(2)the langurs may exhibit different patterns of habitat use and locomotion among different zones of limestone hill.Our results indicated that François’langurs spent more time in the low-risk,relatively food-poor cliff-hilltop areas.When young leaves and fruit were scarce in the dry season,the langurs increased their time in the high-risk,food-rich valley basin.François’langurs were semi-terrestrial,and leaping and climbing were their main locomotor modes.These behavioral patterns are considered to be related to characteristics of topography and vegetation in limestone habitat,such as large areas of cliff and discontinuous canopy.Our results also supported Prediction 2.The langurs confined locomotion to the main canopy and frequently adopted leaping while traveling in the hillside and valley basin.While traveling in cliff-hilltop areas,they tended to stay in the lower stratus(≤5 m)or move on the ground,and walking and climbing were their dominant traveling modes.
基金This study is sponsored by the National Nature Science Foundation of China(No.39960015,30560023,30860050)the Chinese Academy of Sciences 100 Talent Program,the Monitoring and Conservation of Langur Project of the National Forestry Administration of China,the Guangxi Science Foundation(0991095)and the Project of the Creative Team from Colleges and Universities in Guangxi.We thank the Guangxi Forestry Bureau and the Nonggang Nature Reserve Administration Bureau.
文摘Ranging behavior is an important aspect of animal behavior that researchers use to investigate ecological influences on individual behavior.We collected data on the ranging behavior of one group of François’langurs(Trachypithecus francoisi)between August 2003 and July 2004 in a limestone habitat within Nonggang Nature Reserve,China.We evaluated the influences of food availability,water resources and sleeping sites on ranging behavior.During the study period,the total home range size for the study group was 64.5 or(69.3 ha if the lacunae within the borders in which langurs were not observed were included),and the mean daily path length was 541 m.These are well within the range of variation reported in Trachypithecus species.The monthly range size was between 9.8 and 23.3 ha,and monthly range size correlated negatively with young leaf availability.The langurs tended to use a larger range size during young leaf-lean periods.The langurs did not use their home range uniformly,and 74%of their activities occurred within 35%of their home range.The most heavily used quadrats in the home range were located near the most frequently used sleeping sites,suggesting that sleeping sites have a significant influence on the ranging behavior of François’langurs in limestone habitats.
基金We would like to thank the undergradu- ate students from Guangxi Normal University, Yueni Huang, Chun Lan, and Caigui Nong, for their assistance in our experiment. This study was financially supported by Guangxi Science Foundation (2011GXNSFE018005), Guangxi Key Laboratory of Environmental Engineering, Protection, and Assessment Kadoorie Farm & Botanic Garden Corporation, Hong Kong and the Creative Team Project of the universities of Guangxi province, China.
基金Our research is sponsored by grants from the Natural Science Foundation of China(No:31272289,31172065,31101629,J1210002)a grant(Y229YX5105)from the Key Laboratory of Zoological Systematics and Evolution of the Chinese Academy of Sciences.
文摘It is generally accepted that the high phenotypic diversity of mammals is a combined result of developmental constraint and ecological adaptation, although the influence of these endogenous and exogenous factors varies in different mammal groups. The rodent family Sciuridae represents an ideal candidate for examining phenotypic diversity in relation to phylogeny and ecological adaptations. In the present study, we investigate the effects of phylogeny and lifestyle on the skull shape in different species of Sciuridae by applying geometric morphometric methods. In addition, we investigate the importance of allometry on sciurid skull shape, because results from geometric morphometrics sometimes dispute those of traditional morphometry. Here, we identify significant associations between patristic distances obtained from molecular phylogeny and shape distances in all 3 views of the cranium and the lateral view of the mandible. Multivariate regression demonstrates that shape differences among lifestyle categories are substantial, especially in the dorsal and ventral structures after the influence of phylogeny is taken into account. Allometry plays an important role in the shape variation, although its importance on different skull structures varies. Our results indicate that complex structures of this highly diverse mammal group, which occupies different niches, are affected by ecological factors and developmental constraint.
基金sponsored by the National Nature Science Foundation of China(Nos.31172122 and 30970376)the Guangxi Nature Science Foundation(2012GXNSFAA053039)+1 种基金the PhD Degree Construction Fund of Guangxi(XKY2006ZD01)the White-headed Langur Monitoring Project of the National Forestry Administration of China and the Project of the Creative Team from Colleges and Universities in Guangxi.
文摘We collected fecal samples of white-headed langurs from 3 of the 4 remaining habitat fragments(Fa,Fb and CZ)located in southwestern Guangxi,China in Nov 2005,and used 5 microsatellite loci and the SRY gene to assess the relatedness between 46 langurs within and between groups.We observed 2 forms of group structure:one-male/multi-female groups(OMGs)and all-male groups(AMGs).One AMG in Fa was composed of 2 generations,included a father,2 sons and 1 unrelated male,and all OMGs in all 3 habitats included 1 resident male,several adult females and offspring.Of the 21 identified father-offspring cases,the resident male fathered 20(95%)and the non-resident male sired 1(5%),suggesting that adult males had overwhelming priority of access to females as the resident male in an OMG,while the non-resident male may also have the opportunity to adopt surreptitious mating strategies.
基金The first author was supported by NSFC(No.11771313,No.61573010)the Project of China Postdoctoral Science Foundation(No.2015M580777,No.2016T90841)The second author was supported by NSFC(No.11771163).
文摘Numerical computation plays an important role in the study of differential equations with time-delay,because a simple and explicit analytic solution is usually un available.Time-stepping methods based on discretizing the temporal derivative with some step-size∆t are the main tools for this task.To get accurate numerical solutions,in many cases it is necessary to require∆t<τand this will be a rather unwelcome restriction whenτ,the quantity of time-delay,is small.In this paper,we propose a method for a class of time-delay problems,which is completely meshless.The idea lies in representing the solution by its Laplace inverse transform along a carefully de-signed contour in the complex plane and then approximating the contour integral by the Filon-Clenshaw-Curtis(FCC)quadrature in a few fast growing subintervals.The computations of the solution for all time points of interest are naturally parallelizable and for each time point the implementations of the FCC quadrature in all subintervals are also parallelizable.For each time point and each subinterval,the FCC quadrature can be implemented by fast Fourier transform.Numerical results are given to check the efficiency of the proposed method.
基金NSF of China[grant number:11371157]Natural Science Foundation of Anhui Higher Education Institutions of China[grant number:KJ2016A492]Natural Science Foundation of Bozhou College[grant number:BSKY201426,BSKY201535].
文摘In this paper,we study a new numerical technique for a class of 2D nonlinear fractional diffusion-wave equations with the Caputo-type temporal derivative and Riesz-type spatial derivative.Galerkin finite element scheme is used for the discretization in the spatial direction,and the temporal component is discretized by a new alternating direction implicit(ADI)method.Next,we strictly prove that the numerical method is stable and convergent.Finally,to confirm our theoretical analysis,some numerical examples in 2D space are presented.
基金This work was supported by NSF of China(Nos.10671078,60773195)and by Program for NCETthe State Education Ministry of China.
文摘The parareal algorithm,proposed firstly by Lions et al.[J.L.Lions,Y.Maday,and G.Turinici,A”parareal”in time discretization of PDE’s,C.R.Acad.Sci.Paris Ser.I Math.,332(2001),pp.661-668],is an effective algorithm to solve the timedependent problems parallel in time.This algorithm has received much interest from many researchers in the past years.We present in this paper a new variant of the parareal algorithm,which is derived by combining the original parareal algorithm and the Richardson extrapolation,for the numerical solution of the nonlinear ODEs and PDEs.Several nonlinear problems are tested to show the advantage of the new algorithm.The accuracy of the obtained numerical solution is compared with that of its original version(i.e.,the parareal algorithm based on the same numerical method).