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Field body temperature and thermal preference of the big-headed turtle Platysternon megacephalum

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Current Zoology 2013年第5期59卷 626-632页

作者： jianwei shen Fanwei MENG Yongpu ZHANG Weiguo DU Key Laboratory of Animal Ecology and Conservation Biology Institute of Zoology Chinese Academy of Sciences Beijing 100101 China Department of Environmental Sciences School of Life Sciences Hangzhou Normal University Hangzhou 310036 China College of Life and Environmental Sciences Wenzhou University Wenzhou 325027 Zhejiang China

The big-headed turtle Platysternon megacephalum is a stream-dwelling species whose ecology is poorly known. We carried out field and laboratory investigations to determine field body temperatures and thermal preference of this species. In the field, the body temperatures of the turtles conformed to the water temperature, with little diel variation in either summer or au- tumn. Over the diel cycle, the mean body temperatures ranged from 20.8℃ to 22.2℃ in summer and from 19.3℃ to 21.2℃ in autumn; the highest body temperatures ranged from 22.1℃ to 25.0℃ in summer and from 20.6℃ to 23.8℃ in autumn. In the laboratory, the preferred body temperature （Tp） was 25.3℃ Food intake was maximized at 24.0℃, whereas locomotor perfor- mance peaked at 30.0℃. Consequently, Tp was closer to the thermal optimum for food intake than for locomotion. Therefore, this freshwater turtle has relative low field body temperatures corresponding to its thermal environment. In addition, the turtle prefers low temperatures and has a low optimal temperature for food intake [Current Zoology 59 （5）： 626-632, 20＇13].

关键词： Food intake Locomotion Preferred body temperature Thermoregulation Thermal sensitivity

Pattern dynamics of network-organized system with cross-diffusion

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Chinese Physics B 2017年第2期26卷 80-85页

作者： Qianqian Zheng Zhijie Wang jianwei shen College of Information Science and Technology Donghua University Shanghai 201620 China Institute of Applied Mathematics Xuchang University Xuchang 461000 China

Cross-diffusion is a ubiquitous phenomenon in complex networks, but it is often neglected in the study of reaction–diffusion networks. In fact, network connections are often random. In this paper, we investigate pattern dynamics of random networks with cross-diffusion by using the method of network analysis and obtain a condition under which the network loses stability and Turing bifurcation occurs. In addition, we also derive the amplitude equation for the network and prove the stability of the amplitude equation which is also an effective tool to investigate pattern dynamics of the random network with cross diffusion. In the meantime, the pattern formation consistently matches the stability of the system and the amplitude equation is verified by simulations. A novel approach to the investigation of specific real systems was presented in this paper. Finally, the example and simulation used in this paper validate our theoretical results.

关键词： cross diffusion random network Turing instability amplitude equation

Black band disease as a possible factor of the coral decline at the northern reef-flat of Yongxing Island,South China Sea

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Science China Earth Sciences 2014年第4期57卷 569-578页

作者： YANG HongQiang shen jianwei FU FeiXue WANG Yue ZHAO Na CAS Key Laboratory of Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of Sciences University of Chinese Academy of Sciences Department of Biological Sciences University of Southern California3616 Trousdale Parkway

Black band disease （BBD）, characterized by the Cyanobacterial dominated pathogenic consortium, is thought to play a key role in the global decline of the coral reef ecosystems. The present paper originally documents a case of BBD from Yongxing Island （Xisha Islands, South China Sea）, and further probes the reasons of this abnormal phenomenon. Prior to 2007, corals at northern reef-flat of Yongxing Isand were in healthy growth. Catastrophic coral mortality occurred between 2007 and 2008. The 16S rRNA gene sequencing and PCR amplification, with universally conserved primers, were applied to detect the conta- gious bacterial community of the microbial mat. The results demonstrated that six bacterial divisions constituted the clone libraries derived from the BBD mat, and that Cyanobacteria are the most diversely represented group that inhabit BBD bacteri- al mats, despite the fact that species in five others divisions （a-Proteobacteria, y-Proteobacteria, Bacteroidetes, Verrucomi- crobia and Actinobacteria） are also consistently diverse within the BBD mats of diseased coral. Other factors such as coral bleaching, typhoons, ocean acidification and crown-of-thorns starfish outbreaks, are not primarily responsible for the coral mortality within such a short time interval. The disaster expansion of BBD associated with Cyanobacterial blooms is a more likely mechanism impacting these coral reefs. Excessive human activity enhances the eutrophication of the marine water of the reefal region and may result in occurrence of the BBD.

关键词： Black Band Disease (BBD) Cyanobacteria coral deterioration Yongxing Island Xisha Islands

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Coral community dynamics and shallow-water carbonate deposition of the reef-flat around Yongxing Island, the Xisha Islands

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Science China Earth Sciences 2013年第3期56卷 1471-1486页

作者： shen jianwei YANG HongQiang WANG Yue FU FeiXue ZHAO Na CAS Key Laboratory of Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of Sciences University of Chinese Academy of Sciences Department of Biological Sciences University of Southern California

Microbes and microbial carbonates in reef-flat and coral community dynamics and submarine geomorphologic features in reef crest and fore reef of Yongxing Island,the Xisha Islands,South China Sea,were studied by means of scuba diving,underwater investigation,and line intercept transect *** indicate a very high coral mortality with few living corals in the reef flat of Yongxing ***,macro algae,sea grass and cyanobacteria are common in reef *** and microbially induced carbonates occur in reef *** corals grow mainly in the reef crest and fore reef,but are also declined *** coast to off shore,the southeast reef flat of Yongxing Island can be divided into beach,inner reef flat,outer reef flat,reef flat front(reef crest and fore reef),and fore-reef slope *** facies include coast,reef flat,reef crest and fore reef,and fore-reef *** carbonate sediments are composed of coral skeletons and framework,coral fragments,bioclasts,and lime *** the deterioration of environment and water quality,the coral communities tend to be distributed in the reef crest and fore reef with clean sea water,well circulation and moderate water *** flat is occupied mainly by the macro algae and Heliopora coerulea *** coverage statistics on the reef crest demonstrate that the coverage of Acropora cytherea is more than 28% and represents a dominant species with wave-resistant ecological *** characteristics and geomorphologic features are different between the southeast and northwest reef-flat fronts(reef crest and fore reef) of Yongxing *** former shows discontinuously tidal channels in outer reef flat and different dimensional and deep reef ponds in reef crest and fore reef,and the latter presents a typical spur-and-groove ***(cyanobacteria Lyngbya sp.) occur generally in the inner reef flat and reef ponds of reef crest with restricted water *** algae g

关键词： Coral community dynamics and shallow-water carbonate deposition of the reef-flat around Yongxing Island the Xisha Islands

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Dynamic Analysis of Fractional-Order Fuzzy BAM Neural Networks with Delays in the Leakage Terms

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Applied Mathematics 2017年第12期8卷 1808-1819页

作者： Pan Wang jianwei shen Applied Mathematics Xuchang University Xuchang China

In this paper, based on the theory of fractional-order calculus, we obtain some sufficient conditions for the uniform stability of fractional-order fuzzy BAM neural networks with delays in the leakage terms. Moreover, the existence, uniqueness and stability of its equilibrium point are also proved. A numerical example is presented to demonstrate the validity and feasibility of the proposed results.

关键词： Fractional-Order Fuzzy BAM Neural Networks Uniform Stability Delay Leakage Terms

Serpulids and their paleoecology of the Paleogene Kalatar Formation in southwest Tarim Basin of China

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Science China Earth Sciences 2012年第11期55卷 1087-1100页

作者： YANG HaiJun shen jianwei ZHANG LiJuan LI Meng HUANG ZhiBin WANG Yue Key Laboratory of Marginal Sea Geology of CAS South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Exploration and Development Research Institute Tarim Oilfield CompanyPetroleum Company LimitedKorla 841000China

Polychaete serpulids are globally distributed tubeworms mostly in marine environments from Late Triassic to modem time. These calcareous tubeworms could be rock-forming, reef-building, or a principal fouling organism in harbor and bays. Car- bonates of the Paleogene Kalatar Formation in southwest Tarim Basin yield abundant serpulid fossils, which, together with oyster fossils, constitute the characteristic fossil assemblage of the Kalatar Formation. Other common fossils include bivalves, gastropods, ostracods, echinoderms, and bryozoans. Lithologies that yielded serpulid fossils are characterized by micritic bio- clastic limestone, sandy limestone, and shelly limestone, indicating a semi-restricted to open shallow marine environment with medium to low water energy. The research data about serpulids and their fossil materials from China are relatively rare. Based on the studies of tbssils taxonomy, community palaeoecology, and fossil taphonomy, this paper analyzed and studied the types, occurrence, distribution, and morphological characteristics of serpulids and their palaeoecological features in the Kalatar For- mation. Two serpulid community compositions were recognized in the Kalatar Formation, including a rock-forming Ditrupa community and a cluster-growth Propomatoceros community. The Ditrupa community was distributed in coastal environment of the west Kunlun piedmont, lived on sandy hard substrates with little mud, and rarely occurred in lagoon and tidal settings. The Propomatoceros community occurred in offshore middle carbonate ramp in the piedmont of the south Tianshan Moun- tains and in offshore shelf in the piedmont of the west Kunlun Mountains. According to the analysis on the host-rock litholo- gies, preservation and symbionts, it is inferred that serpulids in the Kalatar Formation grew on the oyster shell or other hard substrate, and they did not form reefs or bioherms.

关键词： serpulids palaeoecology Kalatar Formation Paleogene southwest Tarim Basin

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Pattern formation with control theory

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Pattern formation with control theory

Coherence resonance in a noise-driven gene network regulated by small RNA

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作者： jianwei shen Institute of Applied Mathematics Xuchang University

Pattern dynamics behavior of reaction-diffusion equation play an important role in biology chemistry and morphology etc, but it is often investigated by controlling parameter in the *** fact,there are always a lot of variables fixed in a complex *** this paper, we investigate pattern dynamics of a immunity system with control theory by using the method of matrix analysis and obtain a optimal condition under which the system loses stability, Turing pattern occurs. The method above presented is a novel approach to the investigation of specific reaction diffusion systems based on the model developed in this paper, especially to investigate the type of pattern formation with modern control theory. And the simulation used in this paper validate our theoretical results.

关键词： Turing instability Immunity system Control theory pattern formation

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Theoretical & Applied Mechanics Letters 2014年第1期4卷 58-62页

作者： Yanan Zhu jianwei shen Yong Xu Departments of Applied Mathematics Northwestern Polytechnical University Institute of Applied Mathematics Xuchang University

Small RNA has recently drawn more and more attention. In this paper, we concentrate on the influence of noises on gene network regulated by small RNA using chemical Langevin equation. It shows that the noise can cause oscillation when the oscillate does not occur in the corresponding deterministic system. The coherence of the noise induced oscillation reaches a maximum for an optimal intensity of noise, and the coherence resonance appears accordingly. The findings imply probably omnipresent importance of noise in the functioning process of living organism.

关键词： small RNA additive noise coherence resonance

Turing Instability of The Modified Reaction-diffusion Holling-Tanner Model in Random Network

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Turing Instability of The Modified Reaction-diffusion Hollin...