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Competitiveness of alga Microcystis aeruginosa co-cultivated with cyanobacterium Raphidiopsis raciborskii confirms its dominating position

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Journal of Oceanology and Limnology 2022年第5期40卷 1804-1818页

作者： Zengling MA Xiaoqiao ZHANG Renhui LI Min WANG Wenli QIN He ZHANG Gang LI Henguo YU Chuanjun DAI Min ZHAO zhejiang Provincial key laboratory for subtropical water environment and marine biological resources protection Wenzhou UniversityWenzhou 325035China National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban water Pollution Wenzhou UniversityWenzhou 325035China key laboratory of Tropical marine Bio-resources and Ecology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China

Microcystis aeruginosa has always been regarded as the main culprit of cyanobacterial blooms in ***,in recent years,Raphidiopsis raciborskii has gradually replaced *** as the culprit of cyanobacterial blooms in some tropical and subtropical shallow *** reveal which one plays a more dominant role,interactions between cylindrospermospin(CYN)-producing *** and microcystins(MCs)-producing or non-MCs-producing *** strains were studied using bialgal cultures at different initial ratios of biomasses of the two species at 25℃.During the co-cultivation,the *** strains inhibited the growth and heterocyst formation of *** filaments,and thus occupied a dominant position during the co-cultivation regardless of the initial biomass ratios in the *** addition,the MCs-producing M aeruginosa strain contributed to a higher portion of the total biomass and exerted a stronger inhibitory effect on *** compared with the non-MCs-producing ***,the growth of both MCs-producing and non-MCs-producing *** strains was stimulated by *** in the co-cultures compared with *** monoculture,indicating that *** could outcompete *** if given enough time,enabling it to develop into the dominant species even in very low initial *** our best knowledge,this is the first report on the loss of heterocyst formation by a species of cyanobacteria that resulted from interactions between two different species of *** findings indicate that it is difficult for *** to replace the dominant position of *** under the experimental environmental condition,and the allelopathic effects of *** on *** could significantly contribute to the success of ***.

关键词： competition growth heterocyst Microcystis aeruginosa morphology Raphidiopsis raciborskii

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Harmful algal bloom-forming dinofl agellate Prorocentrum donghaiense inhibits the growth and photosynthesis of seaweed Sargassum fusiformis embryos

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Journal of Oceanology and Limnology 2021年第6期39卷 2237-2251页

作者： Caixia WANG Min WANG Binbin CHEN Wenli QIN Lidong LIN Chuanjun DAI Hengguo YU Renhui LI Min ZHAO Zengling MA zhejiang Provincial key laboratory for subtropical water environment and marine biological resources protection Wenzhou UniversityWenzhou 325035China National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban water Pollution Wenzhou UniversityWenzhou 325035China Dongtou Fisheries Science and Technology Research Institute Wenzhou 325700China

Harmful algal bloom(HAB)is an ecological disaster to local *** present,its impact on macrophytes has not been well *** this study,we cultivated sexually propagated embryos of S argassum fusiformis-an edible seaweed-in Prorocentrum donghaiense suspensions at different cell densities(0,0.50×10^(5),0.75×10^(5),1.00×10^(5),and 1.50×10^(5) cells/mL)for 10 days,during which growth and photosynthetic activities of the embryos were determined,and a monocultivation was set up for *** show that the relative growth rate and photosynthetic activities of the embryos co-cultivated with *** were inhibited mostly and significantly in the cell densities of 0.75×10^(5),1.00×10^(5),and 1.50×10^(5) cells/mL,and the inhibitory effects increased in overall with increased cell *** maximum relative electron transport rates(rETR max)and apparent photosynthetic efficiency(a)of co-cultivated embryos were all significantly lower than monocultivation ones on the 10 th ***,the photosynthetic activity detected by chlorophyll-a fluorescence transient(i.e.,OJIP),the electron transport among electron transfer accepters of PSII(photosystem II)and that from PSII to PSI(photosystem I)was restricted,which is probably responsible for the decreases of rETR max andain the co-cultivated *** addition,parts of the photosynthetic reaction centers of PSII in the co-cultivated embryos were ***,*** bloom could restrain the development and photosynthetic activities of *** embryos,reduce the seedlings stock,and eventually hinder the development of *** production industry.

关键词： embryo JIP-test photosynthesis Prorocentrum donghaiense Sargassum fusiformis harmful algal bloom

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Tidal water exchanges can shape the phytoplankton community structure and reduce the risk of harmful cyanobacterial blooms in a semi-closed lake

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Journal of Oceanology and Limnology 2022年第5期40卷 1868-1880页

作者： Wenxu ZHENG Renhui LI Wenli QIN Binbin CHEN Min WANG Wanchun GUAN Xiaoling ZHANG Qiao YANG Min ZHAO Zengling MA zhejiang Provincial key laboratory for subtropical water environment and marine biological resources protection Wenzhou UniversityWenzhou 325035China National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban water Pollution Wenzhou UniversityWenzhou 325035China Department of marine Biotechnology School of Laboratory Medicine and Life ScienceWenzhou Medical UniversityWenzhou 325035China marine Science and Technology College Zhejiang Ocean UniversityZhoushan 316022China School of Petrochemical Engineering and environment Zhejiang Ocean UniversityZhoushan 316022China

For estuaries,inland lakes play a vital role in the ecological balance under the impact of tide *** effect of tides-induced water exchange on phytoplankton community in a semi-closed lake was studied and compared with that of an adjacent closed lake in the Oujiang River mouth in zhejiang,East China Sea,from June 29,2020 to June 14,*** show that the dominant species,abundance,dominance,and diversity of the phytoplankton species between the two lakes were significantly *** the closed lake,cyanobacteria were the dominant species during the study *** the semi-closed lake,the diversification of the dominant species was greater,and some species of diatoms and green algae became *** average phytoplankton abundance in the closed lake was 6 times of that in the semi-closed *** average dominance of cyanobacteria in the closed lake was 0.96,and those in the semi-closed lake and the Oujiang River were 0.51 and 0.22,*** blooms occurred throughout the study time in the closed lake but not in the semi-closed ***,the species diversity richness of the phytoplankton in the semi-closed lake was higher than that of the closed one,and the phytoplankton community between the closed lake and semi-closed lake could be divided into distinctly different groups based on non-metic multidimensional scaling analysis(NMDS)and analysis of similarities(ANOSIM)*** salinity of the water was significantly greater and the transparency significantly smaller in the semi-closed lake than those in the closed ***,water exchange driven by local tidal movement increased salinity and decreased transparency of water,which consequently shaped the community structures of different phytoplankton and reduced the risk of a cyanobacterial bloom outbreak in the semi-closed lake.

关键词： estuary harmful cyanobacterial blooms phytoplankton community water exchange tidal movement environmental parameters

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Food restriction decreases BMR,body and organ mass,and cellular energetics,in the Chinese Bulbul(Pycnonotus sinensis)

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Avian Research 2018年第4期9卷 370-380页

作者： Yiying Zhang Ke Yang Peipei Yang Yingshi Su Weihong Zheng Jinsong Liu School of Life and environmental Sciences Wenzhou UniversityWenzhou’s Chashan University TownWenzhou 325035China zhejiang Provincial key Lab for water environment and marine biological resources protection Wenzhou 325035China

Background: Food is an important environmental factor that affects animals' energy metabolism and food shortage has significant effects on animals' behavior, physiology and biochemistry. However, to date few studies have focused on the thermogenesis and its effects on the body condition of birds. In this study, we examined the effects of food restriction on the body mass, basal metabolic rate(BMR) and body composition, and several physiological, biochemical and molecular markers potentially related to thermogenesis, in the Chinese Bulbul(Pycnonotus sinensis).Methods: Birds in the control group were provided with food ad libitum whereas those in the food restriction group were provided with one-half of the usual quantity of food for 12 days. Oxygen consumption was measured using an open-circuit respirometry system. Mitochondrial state 4 respiration and cytochrome c oxidase(COX) activity in the liver and pectoral muscle were measured with a Clark electrode. Avian uncoupling protein(avUCP) mRNA expression was determined in pectorals muscle with quantitative Real-time ***:Chinese Bulbuls in food restriction group decreased in body mass,BMR and internal organ(heart,kidneys,small intestine and total digestive tract)mass compared with the control group over the 12-day period of food *** in the food restriction group also had lower levels of state-4 respiration,COX activity in the liver and muscle,and mitochondrial avUCP gene expression in muscle compared to the control *** was positively correlated with body mass,state 4 respiration in the liver and COX activity in the ***:Our data indicate that Chinese Bulbuls not only sustain food shortage through simple passive mechanisms,such as reducing body and organ mass and energy expenditure,but also by reducing energetic metabolism in the liver and muscle.

关键词： Avian uncoupling protein Basal metabolic rate Cytochrome c oxidase Food restriction Pycnonotus sinensis State-4 respiration

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Lineage Diversification and Niche Evolution in the Chinese Cobra Naja atra (Elapidae)

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Asian Herpetological Research 2022年第4期13卷 242-250页

作者： Xiaming ZHU Guanyan ZHU Shengnan ZHANG Yu DU Yanfu QU Longhui LIN Xiang JI Hangzhou key laboratory for Ecosystem protection and Restoration College of Life and Environmental SciencesHangzhou Normal UniversityHangzhou311121ZhejiangChina zhejiang Provincial key laboratory for water environment and marine biological resources protection College of Life and Environmental SciencesWenzhou UniversityWenzhou 325035ZhejiangChina Hainan key laboratory for Herpetological Research College of Fisheries and Life ScienceHainan Tropical Ocean UniversitySanya 572022HainanChina College of Life Sciences Nanjing Normal UniversityNanjing 210023JiangsuChina

Theroleof nicheevolution(niche conservatism or niche divergence)in lineage diversification is a poorly studied *** Chinese cobra Naja atra(Elapidae)has diverged into three lineages:Lineage E in eastern China,Lineage S in southern China and Vietnam,and Lineage W in western ***,whether the ecological niche is conserved or divergent among these three lineages is *** the present study,we used ecological niche models in geographical space to study the ecological differences among *** compared the niche overlap in environmental space to test niche conservatism and niche *** results showed that the three lineages of *** shared an ecological niche space between Lineages E and S/W,with the climatic niches of Lineages S and W representing a specialized fraction of the climatic niche of Lineage *** speculated that the niche divergence between Lineages S and W was a consequence of geographical barriers *** evidence for lineage diversification associated with both geographical isolation and climatic niche evolution,suggesting that early niche divergence between Lineages S and W,followed by niche conservatism,causes niche divergence among lineages.

关键词： climatic niche Elapidae Naja atra niche conservatism niche divergence

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Effect of food restriction on the energy metabolism of the Chinese bulbul（Pycnonotus sinensis）

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Zoological Research 2015年第2期36卷 79-87页

作者： Qing-Jian LIANG Lei ZHAO Jia-Qi WANG Qian CHEN Wei-Hong ZHENG Jin-Song LIU School of Life and environmental Sciences Wenzhou University Wenzhou 325035 China zhejiang Provincial key Lab for subtropical water environment and marine biological resources protection Wenzhou 325035 China Institute of applied ecology Wenzhou University Wenzhou 325035 China

Food resources play an important role in the regulation of animals’ physiology and behavior. We investigated the effect of short-term food restriction on metabolic thermogenesis of Chinese bulbuls（Pycnonotus sinensis） by measuring changes in body mass, body fat, basic metabolic rate（BMR）, and organ mass of wild-caught Chinese bulbuls from Wenzhou, China. Short-term food restriction induced a significant decrease in body mass and body fat but body mass returned to normal levels soon after food was no longer restricted. Food restriction caused a significant reduction in BMR after 7 days（P〈0.05）, which returned to normal levels after food restriction ceased. Log total BMR was positively correlated with log body mass（r2=0.126, P〈0.05）. The dry masses of livers and the digestive tract were higher in birds that had been subject to temporary food restriction than in control birds and those subject to continual food restriction（P〈0.001 and P〈0.05, respectively）. There was also significant differences in the dry mass of the lungs（P〈0.05）, heart（P〈0.01）, and spleen（P〈0.05） in birds subject to short-term food restriction compared to control birds and those subject to continual food restriction. BMR was positively correlated with body and organ（heart, kidney and stomach） mass. These results suggest that the Chinese bulbul adjusts to restricted food availability by utilizing its energy reserves, lowering its BMR and changing the weight of various internal organs so as to balance total energy requirements. These may all be survival strategies that allow birds to cope with unpredictable variation in food abundance.

关键词： Basic metabolic rate Energy metabolism Food restriction Pycnonotus sinensis

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The functional significance of residual yolk in lizards

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Current Zoology 2023年第2期69卷 192-199页

作者： Kun Guo Cai-Feng Wang Yu Du Yan-Fu Qu Florentino Brana Xiang Ji zhejiang Provincial key laboratory for water environment and marine biological resources protection College of Life and Environmental SciencesWenzhou UniversityWenzhou 325035ZhejiangChina Hainan key laboratory of Herpetological Research College of Fisheries and Life ScienceHainan Tropical Ocean UniversitySanya 572022HainanChina College of Life Sciences Nanjing Normal UniversityNanjing 210023China Departamento de Biologia de Orgar smos v Sistemas.Universidad de 0viedo Oviedo 33071Spain

Residual yolk is assumed to be an important source of energy and nutrients during early life in nonmammalian *** data show that the mean size of residual yolk is far smaller in lizards than in turtles,snakes,crocodiles,and birds,raising a question of whether residual yolk is of functional significance in ***,we compared data from 26 lizard species with those from other nonmammalian amniotes to test the hypothesis that residual yolk is functionally less significant in species producing more fully developed *** our sample,species mean offspring water contents ranged from 73%to 84%of body wet mass;species mean proportions of carcass dry mass,fat-body dry mass,and residual yolk dry mass to offspring dry mass ranged from 84%to 99%,0%to 5.0%,and 0%to 14.4%,*** are,on average,more fully developed at hatching or birth than snakes,as revealed by the fact that the mean proportion of carcass dry mass to body dry mass and offspring water contents were both higher in lizards than in *** conclude that the functional significance of residual yolk during early life is generally less evident in *** in the lizards where residual yolk is of potential functional significance,this portion of yolk contributes little,if any,to postembryonic *** work could usefully collect data across a wider spectrum of reptile taxa to establish a precocial-altricial continuum and test the hypothesis that species with a smaller amount of residual yolk are closer to the precocial end of the continuum.

关键词： carcass fatbody lizards offspring postembryonicgrowth residual yolk

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Seasonal phenotypic flexibility of body mass,organ masses,and tissue oxidative capacity and their relationship to BMR in Chinese bulbuls

Seasonal phenotypic flexibility of body mass,organ masses,an...

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浙江省动物学会第十二届会员代表大会暨学术讨论会

作者： Zheng Weihong Liu Jinsong School of Life and environmental Sciences Wenzhou University zhejiang Provincial key Lab for subtropical water environment and marine biological resources protection

Survival of small birds in fluctuating environments is facilitated by seasonal metabolic and morphological *** bulbuls Pycnonotus sinensis show winter increases in basal metabolic rate(BMR),nutritional organ masses,and liver and muscle cellular aerobic capacity relative to *** this study,we build on these previous studies by measuring seasonal adjustments in body mass(Mb),BMR,nutritional organ masses and several physiological, biochemical and hormonal markers over the entire annual cycle in wild-trapped Chinese bulbuls from Wenzhou,and we analyzed the relationships between variation in organ masses and cellular aerobic capacity and variation in BMR in individual birds.M and BMR were higher in spring (March to May) and winter(December to February) than in summer(June to August).The dry masses of several nutritional organs and mitochondrial protein content,state-4 respiration and cytochrome c oxidase(COX) activity in liver and muscle were all heightened in winter relative to other *** addition,heart and pectoral muscle,but not nutritional organ,dry masses and biochemical markers of cellular aerobic capacity in liver and muscle were positively correlated with *** triiodothyronine(T) concentration was higher in winter and spring than summer and autumn,and was positively correlated with BMR,mitochondrial protein content, state-4 respiration and COX activity in liver and *** results suggest that Chinese bulbuls rely on seasonal changes in nutritional organ masses as well as liver and muscle cellular aerobic capacity more than changes in skeletal muscle mass to promote seasonal metabolic flexibility.T appears to promote these seasonal thermoregulatory adjustments.

关键词： Pycnonotus sinensis seasonal acclimatization phenotypic flexibility basal metabolic rate(BMR) cytochrome c oxidase(COX) state-4 respiration thyroid hormone

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Seasonal variations of body mass,body temperature,thermogenesis and its adaptive significance in Hwamei,Garrulax canorus

Seasonal variations of body mass,body temperature,thermogene...

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浙江省动物学会第十二届会员代表大会暨学术讨论会

作者： Wu Meixiu Zhou Limeng Xia Susu Zhao Lidan Zhang Huiying Zheng Weihong Liu Jinsong School of Life and environmental Sciences Wenzhou University zhejiang Provincial key Lab for subtropical water environment and marine biological resources protection

Basal thermogenesis of birds is beginning to be viewed as a highly flexible physiological trait influenced by environmental fluctuations,and in particular changes in ambient temperatures(T).Many birds living in regions with seasonal fluctuations in T typically respond to cold by increasing insulation and adjusting metabolic *** understand modes of metabolic adaptations,body temperature(T),metabolic rate(MR),thermal neutral zone(TNZ),and thermal conductance were measured in Hwameis Garrulax canorus that were live-trapped in winter and summer at a temperature range from 5 to 40℃,*** a temperature range from 5 to 40℃,the mean T was 41.6±0.1℃in the winter and 42.3±0.1℃in the *** of the Hwamei was between 27.5 and 37.5℃in the winter and between 28.0 and 35.0℃in the summer. The mean basal metabolic rate(BMR) within TNZ was 203.32±11.81 ml O h in the winter and 168.99±6.45ml Ohin the *** thermal conductance was 0.18±0.00 ml O gh℃ in the winter and 0.16±0.00 ml O g h℃ in the *** ecological physiology properties for the Hwameis were higher T,MR,and wider TNZ in winter compared with summer. The increased BMRs in winter indicate improved ability to cope with cold and maintenance of a high *** results show that the metabolism of Hwameis are not constant,but exhibit a pronounced seasonal phenotypic flexibility with maintenance of a high T.

关键词： Garrulax canorus Body temperature Basal metabolic rate Thermal conductance Seasonal variation

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Seasonal variation in body mass and energy budget in Chinese bulbuls Pycnonotus sinensis

Seasonal variation in body mass and energy budget in Chinese...

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浙江省动物学会第十二届会员代表大会暨学术讨论会

作者： Xiao Yuchao Yang Fang Zhou Limeng Zheng Weihong Liu Jinsong School of Life and environmental Sciences Wenzhou University zhejiang Provincial key Lab for subtropical water environment and marine biological resources protection

Seasonal adjustments in body mass and energy budget are important for the survival of small birds in temperate *** changes in the body mass,body temperature,gross energy intake(GEI),digestible energy intake(DEI),body fat content,and length and mass of the digestive tract,were measured in wild-caught Chinese bulbuls Pycnonotus sinensis at Wenzhou, *** mass showed significant seasonal variation and was higher in spring and winter than in summer and *** fat was higher in winter than in other *** and DEI were significantly higher in *** length and mass of the digestive tract were greatest in winter and the magnitude of both these parameters was positively correlated with body mass,GEI and DEL Small passerines typically have higher daily energy expenditure in winter,necessitating increased food *** general observation is consistent with the observed winter increase in gut volume and body mass in Chinese *** results suggest that Chinese bulbuls adjust to Winter conditions by increasing their body mass,body fat,GEI,DEI and digestive tract size.

关键词： digestive tract energy budget morphology Pycnonotus sinensis seasonal variation

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