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diel vertical migration of mesozooplankton in the northern Yellow Sea

Journal of Oceanology and Limnology 2021年第4期39卷 1373-1386页

作者： Ruping GE Hongju CHEN Guangxing LIU Yanzhong ZHU Qiang JIANG Key Laboratory of Marine Environment and Ecology Ministry of EducationOcean University of ChinaQingdao 266100China Marine Ecology and Environmental Science Laboratory Pilot National Laboratory for Marine Science and TechnologyQingdao 266200China National Joint Research Center for Yangtze River Conservation Chinese Research Academy of Environmental SciencesBeijing 100012China

The Yellow Sea Cold Water Mass(YSCWM),one of the most vital hydrological features of the Yellow Sea,causes a seasonal thermocline from spring to *** diel vertical migration(DVM)of zooplankton is crucial to structural pelagic communities and food webs,and its patterns can be aff ected by thermocline depth and ***,we investigated zooplankton community succession and seasonal changes in zooplankton DVM at a fixed station in the *** zooplankton community succession was aff ected by the forming and fading of the YSCWM.A total of 37 mesozooplankton taxa were *** highest and lowest species numbers in autumn and spring were *** highest and lowest total densities were observed in autumn(14464.1 inds./m^(3))and winter(3115.4 inds./m^(3)),*** DVM of the dominant species showed obvious seasonal *** the YSCWM was weak in spring and autumn,most species(*** parvus,Oithona similis,and Acartia bifilosa)stayed above the thermocline and vertically migrated into the upper *** sinicus and Aidanosagitta crassa crossed the thermocline and vertically *** species migrated through the stratification in summer,and all of the species were limited above(*** and ***)or below(*** and Centropages abdominalis)the *** YSCWM disappeared in winter,and zooplankton species were found throughout the water ***,the existence of thermocline influenced the migration patterns of *** analyses showed that the existence of YSCWM resulted in significant differences between zooplankton communities above and below the thermocline.

关键词： mesozooplankton diel vertical migration Yellow Sea Cold Water Mass North Yellow Sea thermocline

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diel vertical migration of dominant planktonic crustaceans in the south branch of Yangtze Estuary,China

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Aquaculture and Fisheries 2021年第4期6卷 414-423页

作者： Tianli Li Tonglin Liu Ruhan Liu Lijing Chen National Demonstration Center for Experimental Fisheries Science Education Shanghai Ocean UniversityShanghai201306China Key Laboratory of Freshwater Aquatic Genetic Resources Ministry of AgricultureShanghai Ocean UniversityShanghai201306China Shanghai Collaborative Innovation for Aquatic Animal Genetics and Breeding Shanghai Ocean UniversityShanghai201306China

Zooplanktons are important food organisms of fishes,and their spatial and temporal distribution pattern has an important influence on the growth and reproduction of fishes in local *** Yangtze River Estuary of China is rich in fishery resources,but the knowledge on the distribution pattern of zooplankton in this area is still very *** diel vertical migration(DVM)patterns and seasonal variations of the crustacean community,and their relationship with environmental factors were investigated in the south branch of the Yangtze Estuary,from June 2017 to May *** results showed that the dispersion patterns of dominant crustacean taxa in the Yangtze Estuary were mostly *** amplitudes of crustacean were greater in spring and summer than in autumn and winter,and different migratory patterns occurred in different *** dorrii,Schmackeria inopinus,Mesmackeria leuckarti,Bosmina longirostris,and ***,unlike ***,showed a significant *** DVM patterns of crustaceans was possibly influenced by light dentisy,temperature,and total dissolved solids in the water column,and the fish predation effect;whereas,the nutrient concentration and pH were not supposed to be key factors.

关键词： Yangtze estuary Planktonic crustacean Dispersion pattern diel vertical migration

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Zooplankton diel vertical migration and influence of upwelling on the biomass in the Chukchi Sea during summer

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Acta Oceanologica Sinica 2015年第5期34卷 68-74页

作者： WANG Huiwu CHEN Hongxia XUE Liang LIU Na LIU Yanliang College of Physical and Enviromental Oceanography Ocean University of China First Institute of Oceanography State Oceanic Administration

The diel vertical migration （DVM） of zooplankton and the influence of upwelling on zooplankton biomass were examined using water column data of current velocity and mean volume backscattering strength （MVBS） collected by moored acoustic Doppler current profilers （ADCPs） deployed in the southeastern Chukchi Sea during the 5th Chinese National Arctic Research Expedition （CHINARE） in summer 2012, combined with the satellite observational data such as sea surface temperature （SST）, wind, and chlorophyll a （Chl a）. Hourly acoustic data were continuously collected for 49-d in the mooring site. Spectral analysis indicated that there were different migrating patterns of zooplankton, even though precisely classifying the zooplankton taxa was not available. The prevailing 24-h cycle corresponded to the normal DVM with zooplankton swimming upwards at sunrise and returning to deep waters at sunset. There was a clear DVM in the upper 17 m of the water column during the period with distinct day-night cycles, and no active DVM throughout the water column when the sun above the horizon （polar day）, suggesting that light intensity was the trigger for DVM. Also there was a second migrating pattern with 12-h cycle. The upwelling event occurring in the northwest of Alaskan coastal area had important influence on zooplankton biomass at the mooring site. During the upwelling, the SST close to the mooring site dropped significantly from maximal 6.35℃to minimal 1.31℃ within five days. Simultaneously, there was a rapid increase in the MVBS and Chl a level, suggesting the aggregation of zooplankton related to upwelling.

关键词： Chukchi Sea diel vertical migration zooplankton biomass upwelling

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The diel vertical migration of the sound-scattering layer in the Yellow Sea Bottom Cold Water of the southeastern Yellow Sea: focus on its relationship with a temperature structure

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Acta Oceanologica Sinica 2013年第9期32卷 44-49页

作者： LEE Hyungbeen CHO Sungho KIM Woongseo KANG Donhyug Maritime Security Research Center Korea Institute of Ocean Science&Technology Deep-sea and Seabed Resources Research Division Korea Institute of Ocean Science&Technology

Using the hydroacoustic method with a 200 kHz scientific echo sounding system, the diel vertical migration （DVM） of the sound-scatteringlayer （SSL） in the Yellow Sea Bottom Cold Water （YSBCW） of the southeastern Yellow Sea was studied in April （spring） and August （summer） of 2010 and 2011. For each survey, 13-27 hours of acoustic data were continuously collected at a stationary station. The acoustic volume scattering strength （Sv） data were analyzed with temperature profile data. In the spring of both 2010 and 2011, the SSL clearly showed the vertical migration throughout the entire water column, moving from the surface layer at night to near the bottom during the day. Conductivity, temperature, and depth data indicated that the entire water column was well mixed with low temperature of about 8℃. However, the SSL showed different patterns in the summers of 2010 and 2011. In the summer of 2010 （≈28℃ at the surface）, the SSL migrated to near the bottom during the day, but there were two SSLs above and below the thermocline at depth of 10-30 m at night. In the summer of 2011 （≈20℃ at the surface）, the SSL extended throughout the entire water column at night, possibly owing to an abrupt change in sea weather conditions caused by the passage of a Typhoon Muifa over the study area. It was cancluded that the DVM patterns in summer in the YSBCW area may be greatly influenced by a strengthened or weakened thermocline.

关键词： diel vertical migration sound-scattering layer temperature structure typhoon Yellow Sea Bot- tom Cold Water

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Seasonal variation in abundance, diel vertical migration and body size of pelagic tunicate Salpa fusiformis in the Southern Yellow Sea

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Chinese Journal of Oceanology and Limnology 2012年第1期30卷 92-104页

作者： LIU Yongqin SUN Song ZHANG Guangtao Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Graduate University of Chinese Academy of Sciences Beijing 100049China

Mass occurrence of Salpafusiformis June 2007. In order to investigate its population was observed in the Southern Yellow Sea in May and recruitment and environmental adaptation, temporal variation of abundance, diel vertical migration （DVM） and length frequency distribution of both aggregate and solitary forms were studied with samples collected from eight months during September 2006 to August 2007. S. fusiformis presented in six months other than September and October 2006, and average abundance of aggregate and solitary forms peaked in June and May, respectively. In December, aggregate forms were absent in the bottom layer and performed irregular DVM from surface to 50 m depth, while solitary forms was too scarce to perform diel vertical distribution analysis. Both aggregate and solitary forms presented reverse DVM in May and June. They migrated upwards during daytime and concentrated in surface layer at sunset. The bimodal distribution of aggregate forms was found in April and the average size was largest in this month. In other months, the smaller aggregate forms （1-5 ram） dominated in populations except for May, when the modal size ranged from 2 to 8 mm. The average size of solitary forms was largest in December, followed by April. The skewed nomal distribution of solitary forms was found in May and June, with the modal size of 2-7 mm and 5-13 ram, respectively.

关键词： Salpafusiformis swarm diel vertical migration length frequency Southern Yellow Sea

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The diel vertical migration of sound scatterers observed by an acoustic Doppler current profiler in the Luzon Strait from July 2009 to April 2011

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Acta Oceanologica Sinica 2013年第11期32卷 1-9页

作者： YANG Chenghao LIAO Guanghong YUAN Yaochu CHEN Hong ZHU Xiaohua State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyState Oceanic Administration

Acoustic Doppler current profiler （ADCP） receives echoes from sound scatterers, then their speed is calcu- lated by the Doppler effect. In the open ocean, most of these backscatterers are from the plankton. The sound scatterers descend down to depth at around dawn, their mean speed is 2.9 cm/s, then they ascend up to the surface layer at around dusk with a mean speed of 2.1 cm/s, in the Luzon Strait. The descending speed is faster, which suggests that this zooplankton population may accelerate its downward migration under the action of the gravity. The vertical distribution of a mean volume backscattering strength （MVB- S） in the nighttime has two peaks, which locate near the upper and lower boundary layers of halocline, respectively. However, the backscatterers only aggregate near the surface layer in the daytime. The diel ver- tical migration （DVM） of sound scatterers has several characteristic patterns, it is stronger in summer, but weaker in winter, and the maximum peak occurs in September. The DVM occurrence is synchronous with the seawater temperature increasing at around dawn and dusk, it may affect the ocean mixing and water stratification,

关键词： diel vertical migration acoustic Doppler current profiler mean volume backscattering strength,Luzon Strait water stratification

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Spatial patterns and environmental associations of deep scattering layers in the northwestern subtropical Pacific Ocean

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Acta Oceanologica Sinica 2022年第7期41卷 139-152页

作者： Yuhang Song Juan Yang Chunsheng Wang Dong Sun Key Laboratory of Marine Ecosystem Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou310012China School of Marine Sciences China University of GeosciencesBeijing100083China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519080China

The mesopelagic communities are important for food web and carbon pump in ocean,but the large-scale studies of them are still limited until now because of the difficulties on sampling and analyzing of mesopelagic *** organisms,especially micronekton,can form acoustic deep scattering layers(DSLs)and DSLs are widely *** explore the spatial patterns of DSLs and their possible influencing factors,the DSLs during daytime(10:00–14:00)were investigated in the subtropical northwestern Pacific Ocean(13°–23.5°N,153°–163°E)using a shipboard acoustic Doppler current profiler at 38 *** study area was divided into three parts using k-means cluster analysis:the northern part(NP,22°–24°N),the central part(CP,17°–22°N),and the southern part(SP,12°–17°N).The characteristics of DSLs varied widely with latitudinal *** core DSLs(523.5 m±17.4 m),largest nautical area scattering coefficient(NASC)(130.8 m^(2)/n mile^(2)±41.0 m^(2)/n mile^(2)),and most concentrated DSLs(mesopelagic organisms gathering level,6.7%±0.7%)were observed in *** proportion of migration was also stronger in NP(39.7%)than those in other parts(18.6%in CP and 21.5%in SP)for mesopelagic *** latitudinal variation of DSLs was probably caused by changes in oxygen concentration and light intensity of mesopelagic zones.A positive relationship between NASC and primary productivity was identified.A four-months lag was seemed to *** study provides the first basin-scale baselines information of mesopelagic communities in the northwest Pacific with acoustic *** researches are suggested to gain understandings of seasonal and annual variations of DSLs in the region.

关键词： deep scattering layers mesopelagic community baseline diel vertical migration zooplankton micronekton

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EFFECT OF KAIROMONE ON PREDATOR-PREY DYNAMICS -- A DELAY MODEL

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International Journal of Biomathematics 2013年第5期6卷 149-188页

作者： SUDIP SAMANTA JOYDEV CHATTOPADHYA＊ Agricultural and Ecological Research Unit Indian Statistical Institute 203 B. T. Road Kolkata 700108 India

In most of the predator-prey systems, prey individuals make transitions between vulnerable and invulnerable states or locations. This transition is regulated by various inducible defense mechanisms. diel vertical migration （DVM） in zooplankton is the most effective and instantaneous defense observed in zooplankton population. Zooplankton shows downward vertical migration in the daytime in the presence of predators （or predator kairomones） to avoid predation （i.e. refuge use）, and it enters into the surface water again at night to graze phytoplankton. The dynamics of the planktonic ecosystem under DVM of zooplankton along with fish kairomone and the multiple delays due to migration for vulnerable and invulnerable prey and reproduction in the predator population is of considerable interest both in theoretical and experimental ecologists. By developing mathematical model, we analyze such a system. The conditions for which the system enters into Hopf-bifurcation are obtained. Moreover, the conditions for which the bifurcating branches are supercritical are also derived. Our results indicate that DVM along with the effect of kairomone and multiple delays with a certain range are responsible to enhance the stability of the system around the positive interior equilibrium point.

关键词： Kairomone diel vertical migration vulnerable and invulnerable prey timedelay stability analysis Hopf-bifurcation numerical simulations.

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