scholarly journals Shifting Feeding Habits During Settlement Among Small Yellow Croakers (Larimichthys polyactis)

2022 ◽  
Vol 8 ◽  
Author(s):  
Yuange Chen ◽  
Weilong Wang ◽  
Wei Zhou ◽  
Fen Hu ◽  
Meiqin Wu
Keyword(s):  
Species Richness ◽  
Body Length ◽  
Environmental Changes ◽  
Feeding Habits ◽  
River Estuary ◽  
The Body ◽  
The Yellow Sea ◽  
Yangtze River Estuary ◽  
Larimichthys Polyactis ◽  
Dietary Breadth

The small yellow croaker, Larimichthys polyactis, is a keystone species in the Yellow Sea and the East China Sea, with significant impacts on the regional ecosystem, but has experienced decades of population decline as a result of environmental changes and overfishing. The settlement of post-larval L. polyactis is a period of high mortality, with impacts on population recruitment and survival. This study examines the feeding habits of 49 post-larval and early juvenile L. polyactis in the Yangtze River estuary, in order to reveal diet composition before and after the settlement period. DNA barcoding methods (MiSeq and TA cloning) were used to examine gastrointestinal contents in detail. Both methods revealed that dietary breadth increased with increasing body length, while the dominance of copepods in the diet decreased as the body length increased. Post-larva (body length < 17 mm in this study) primarily fed on copepods. At the beginning of settlement (body length between 17 and 19 mm), L. polyactis began to ingest larger organisms, such as fishes and mysids, along with copepods. Larger early juveniles (body length > 20 mm) demonstrated a much wider dietary breadth, implying that successful settlement had occurred. Diet species richness in the MiSeq group was significantly greater than species richness in the TA cloning group, making the trend more pronounced within the MiSeq group. This indicates that the MiSeq method was more efficient than TA cloning in this study. We recommend that future research to investigate the feeding habits of fish larvae should combine MiSeq and visual examination methods.

Responses of summer phytoplankton community to drastic environmental changes in the Changjiang (Yangtze River) estuary during the past 50 years

2014 ◽  
Vol 54 ◽  
pp. 1-11 ◽  
Author(s):  
Zhibing Jiang ◽  
Jingjing Liu ◽  
Jianfang Chen ◽  
Quanzhen Chen ◽  
Xiaojun Yan ◽  
...  
Keyword(s):  
Yangtze River ◽  
Phytoplankton Community ◽  
Environmental Changes ◽  
River Estuary ◽  
Yangtze River Estuary ◽  
The Past

Prediction of fish species richness in the Yangtze River estuary using CART algorithm

2018 ◽  
Vol 25 (5) ◽  
pp. 1082
Author(s):  
Libin DAI ◽  
Jinhui CHEN ◽  
Siquan TIAN ◽  
Chunxia GAO ◽  
Jiaqi WANG ◽  
...  
Keyword(s):  
Species Richness ◽  
Fish Species ◽  
Yangtze River ◽  
River Estuary ◽  
Yangtze River Estuary ◽  
The Yangtze River ◽  
The Yangtze River Estuary ◽  
Cart Algorithm

scholarly journals Spatial Distributions of Picoplankton and Viruses in the Changjiang Estuary and Its Adjacent Sea Area during Summer

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Yun Li ◽  
Daoji Li
Keyword(s):  
Environmental Changes ◽  
Heterotrophic Bacteria ◽  
River Estuary ◽  
Yangtze River Estuary ◽  
Nutrient Concentrations ◽  
Viral Abundance ◽  
The Changjiang Estuary ◽  
The Individual ◽  
Sea Area

Simultaneous determination of picoplankton (i.e.,Synechococcusspp.,Prochlorococcusspp., picoeukaryotes, and heterotrophic bacteria) and viruses in the Changjiang (Yangtze) River estuary and its adjacent sea area was made using flow cytometry during a cruise in June 2006. The results show thatProchlorococcusin all samples was below detectable level. The abundances ofSynechococcus, picoeukaryotes, heterotrophic bacteria, and viruses ranged from0.00to1.22×108cell L−1,0.01×106to1.42×107cells L−1,8.40×107to4.29×109cells L−1, and1.20×107to1.06×1010particles L−1, respectively. The determined picoplankton groups and viruses distinctly increased with the distance off the estuary and where the maximum abundance that occurred in these groups was different somewhat due to the individual sensitivity to environmental changes. Viral abundance showed a positive correlation with salinity and negative correlations with turbidity and inorganic nutrient concentrations. Positive linear relations were found betweenSynechococcus, heterotrophic bacteria, and viruses.

scholarly journals Ocean Dynamics Observed by the VIIRS Day-Night Band Measurements

2017 ◽  
Author(s):  
Wei Shi ◽  
Menghua Wang
Keyword(s):  
Infrared Imaging ◽  
Environmental Changes ◽  
River Estuary ◽  
Ocean Dynamics ◽  
Yangtze River Estuary ◽  
Hangzhou Bay ◽  
Algae Bloom ◽  
Coastal Dynamic ◽  
And Migration ◽  
Ocean Environment

Three cases of Day-Night Band (DNB) observations of the Visible Infrared Imaging Radiometer Suite (VIIRS) onboard the Suomi National Polar-orbiting Partnership (SNPP) are explored for applications to assess the ocean environment and monitor ocean dynamics. An approach to use the DNB radiance ratio was developed in order to better continuously assess the ocean diurnal and short-term environmental changes with VIIRS DNB observations. In the La Plata River Estuary, the sediment fronts showed 20–25 km diurnal inshore-offshore movements on March 13, 2017. In the waters off the Argentina coast in the South Atlantic, VIIRS DNB measurements provided continuous observations and monitoring of the algae bloom development and migration between 24–26 March 2016. This algae bloom generally kept the same spatial patterns, but moved nearly 20 km eastward in the three-day period. In the Yangtze River Estuary and Hangzhou Bay region in China’s east coast, VIIRS DNB observations also revealed the complicated coastal dynamic changes between 12–14 April 2017. Even though there are still some challenges and limitations for monitoring the ocean environment with VIIRS DNB observations, this study shows that satellite DNB observations can provide additional data sources for ocean observations, especially observations during the nighttime.

scholarly journals Biology of the marine tucuxi dolphin (Sotalia fluviatilis) in south-eastern Brazil

2004 ◽  
Vol 84 (6) ◽  
pp. 1245-1250 ◽  
Author(s):  
Ana Paula Madeira Di Beneditto ◽  
Renata Maria Arruda Ramos
Keyword(s):  
Body Length ◽  
Feeding Habits ◽  
Postnatal Growth ◽  
The Body ◽  
Body Dimension ◽  
Eastern Brazil ◽  
Trichiurus Lepturus ◽  
Xenobalanus Globicipitis ◽  
Back Calculation ◽  
The Relationship

Age, growth and reproductive parameters related to the marine tucuxi are presented, as well as feeding habits and parasitism. The specimens' age ranged from zero (newborn) to 21 years for males and 0·5 to 30 years for females. In relation to the body dimension, length distributions were bell-shaped for both sexes with male marine tucuxi ranging from 86·0 to 200·0 cm in length and females from 117·5 to 198·0 cm. The body length of new-born and calves varied between 86·0 to 117·5 cm and the postnatal growth curve an asymptotic reached length of 191·0 cm. According to the relationship between age, body length and reproductive characteristics, male and female specimens were considered sexually mature when [ges ]6 years and body length [ges ]180·0 cm and [ges ]6 years and body length [ges ]160·0 cm, respectively. Males and females up to six years old represented around 80% of the captures, indicating a bias towards juveniles and individuals that have yet to reach sexual maturity. The youngest specimen with solid contents in the stomach was 119·0 cm in length and seven months old. The marine tucuxi feeds on neritic prey, preferentially on the teleost fishes Trichiurus lepturus and Porichthys porossisimus, and on the cephalopods Loligo sanpaulensis and L. plei. Back calculation of prey lengths indicated that fish ranged from 1·2 to 106·9 cm and cephalopods from 3·4 to 22·2 cm. The barnacle Xenobalanus globicipitis was recorded attaching to the caudal fin and the helminths Braunina cordiformis, Anisakis typica, Halocercus brasiliensis and Nasitrema sp. were found in the internal organs.

Annual variability of ichthyoplankton in the Yangtze River estuary of China from August 2002 to 2009

2013 ◽  
Vol 42 (1) ◽  
Author(s):  
Mei Jiang ◽  
Xin-Qiang Shen ◽  
Lei Li ◽  
Wei-Min Quan
Keyword(s):  
Yangtze River ◽  
River Estuary ◽  
The Yellow Sea ◽  
Yangtze River Estuary ◽  
The Yangtze River ◽  
Annual Variability ◽  
The Pacific ◽  
Coilia Mystus ◽  
The Yangtze River Estuary ◽  
Species Richness And Abundance

AbstractThe annual variability of ichthyoplankton in the Yangtze River estuary, located at the junction of the East China Sea and the Yellow Sea, on the continental shelf at the western rim of the Pacific Ocean, was studied using vertical tows at twenty stations from August 2002 to August 2009. Basic oceanographic parameters such as temperature and salinity were also measured to evaluate their relationship to the abundance of ichthyoplankton. The eggs or larvae of a total of 34 fish species were present in the samples. Only 8 species were found to occur during every year. Engraulis japonicus and Stolephorus commersonii eggs, as well as Coilia mystus and Stolephorus commersonii larvae, were highly abundant during this period. Additionally, water storage in the Three Gorges Reservoir, which began in June 2003, had significant effects on the abundance of estuarine species, as well as on the composition and diversity of ichthyoplankton; this became evident when these values were compared to the findings from 2002. The number of species (species richness) and abundance of each species varied among the stations relative to the salinity in the estuary during the study period.

scholarly journals Historical records of eutrophication in Changjiang (Yangtze) River estuary and its adjacent East China Sea

2012 ◽  
Vol 9 (6) ◽  
pp. 6261-6291 ◽  
Author(s):  
F. Cheng ◽  
X. Song ◽  
Z. Yu ◽  
D. Liu
Keyword(s):  
East China Sea ◽  
Yangtze River ◽  
Environmental Changes ◽  
River Estuary ◽  
East China ◽  
Yangtze River Estuary ◽  
Red Tides ◽  
Changjiang River ◽  
Diatom Assemblages ◽  
China Sea

Abstract. Two sediment cores from the Changjiang (Yangtze) River estuary and its adjacent East China Sea were collected and studied for eutrophication history using paleoecological records of environmental changes over the last century. A multiproxy approach by using biological and geochemical analyses revealed changes in diatom assemblages, total organic carbon (TOC), total nitrogen (TN) and biogenic silica (BSi) and give an indication of nutrient in status and trends in Changjiang River estuary and its adjacent East China Sea. The diatom assemblages in the two cores generally increased gradually from the 1970s, and accelerated from the 1990s until now, reflecting the increased eutrophication and causing large algae blooms/red tides. The TOC, TN and BSi showing the similar trends, supported the interpretation of the eutrophication process indicated by diatom analyses. The two cores were located in different sea areas of the East China Sea, and we discuss their relative changes based on their environment characteristics. We also discuss the potential effect of anthropogenic influences and ongoing projects on eutrophication in the Changjiang River and its adjacent East China Sea.

Feeding habits ofLateolabrax maculatusin Yangtze River estuary

2012 ◽  
Vol 32 (13) ◽  
pp. 4181-4190 ◽  
Author(s):  
洪巧巧 HONG Qiaoqiao ◽  
庄平 ZHUANG Ping ◽  
杨刚 YANG Gang ◽  
张涛 ZHANG Tao ◽  
侯俊利 HOU Junli ◽  
...  
Keyword(s):  
Yangtze River ◽  
Feeding Habits ◽  
River Estuary ◽  
Yangtze River Estuary
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