Bio: Kaizhi Li is an academic researcher from Chinese Academy of Sciences. The author has contributed to research in topics: Zooplankton & Bay. The author has an hindex of 9, co-authored 24 publications receiving 222 citations.
TL;DR: In this article, the distribution and abundance of thaliaceans were studied in relation to physical and biological variables during summer and winter in the northwest continental shelf of South China Sea.
15 Sep 2011
TL;DR: In this article, the authors studied the effect of monsoon, coastal current and temperature on the distribution and seasonal variations of Calanus sinicus abundance and found that the abundance of C sinicus varied seasonally and regionally.
Abstract: The effect of monsoon, coastal current and temperature on the distribution and seasonal variations of Calanus sinicus abundance were studied. The samples from the northwest continental shelf of South China Sea were collected with 505 mu m planktonic nets from July 2006 to October 2007. The abundance of C sinicus made up 34.28% and 12.34% of all copepods in spring and summer, respectively. The distribution of C. sinicus varied seasonally and regionally. The distribution of C. sinicus ranged between east inshore and offshore waters from the Leizhou Peninsula to Hainan Island, with a mean of 23.00 (+/- 77.78) ind. m(-3) in spring. In summer it had a mean of 13.74 (+/- 45.10) ind. m(-3) occurring only in the east inshore waters from Leizhou Peninsula to Hainan Island. C. sinicus was not abundant during autumn and winter seasons. The surveyed area was divided into three sub-regions based on topographical analysis and water mass, region I (included the east inshore waters of Leizhou Peninsula), region II (included the east inshore waters of Hainan Island) and region III (included the offshore waters from Leizhou Peninsula to Hainan Island). The average abundance of C. sinicus within region I was determined to be 115.63 (+/- 145.93) and 68.12 (+/- 84.00) ind. m(-3) in spring and summer, respectively, values higher than those of regions II and III. Our findings suggested that C. sinicus was transported from the East China Sea to the northwest continental shelf of South China Sea by the Guangdong Coastal Current, which was driven by the northeast monsoon in spring. The presence of a cold eddy, in addition to coastal upwelling driven by the southwest monsoon, provided suitable survival conditions for C. sinicus in summer. This species disappeared in autumn due to high temperatures (> 27 degrees C) and did not begin to enter into the northwest continental shelf of South China Sea from the East China Sea during the period of investigation in winter. The frequency of C sinicus was low in region III during the year as a result of the South China Sea Warm Current and pelagic waters with high temperature during the spring and summer months. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.
TL;DR: Investigation of early summer phytoplankton biomass, species composition and size-fractioned productivity in surface water from the Java Sea to the South China Sea from 18 May to 27 May 2010 found that Chl a concentration and productivity were significantly correlated with microplankton cell abundance, as well as nutrient concentrations, which appeared to exert a strong influence over latitudinal variation in primary production.
Abstract: In order to study the effects of latitudinal change in physical and chemical environments on phytoplankton cells, we investigated the early summer phytoplankton biomass, species composition and size-fractioned productivity in surface water from the Java Sea to the South China Sea (from 6 degrees S to 20 degrees N) from 18 May to 27 May 2010. Chlorophyll a (Chl a) concentration decreased latitudinally from 0.18 (similar to 6 degrees S) to 0.05 mu g l(-1) (similar to 10 degrees N). The dominant species, the cyanobacteria Trichodesmium erythraeum, dinoflagellates (e. g. Gyrodinium dominans, Amphidinium carterae and Gonyaulax spp.) and diatoms (e. g. Thalassionema nitzschioides, Rhizosolenia spp. and Chaetoceros spp.) changed to only the dinoflagellate species. Also, the Chl a biomass increased to 0.14 mu g l(-1) towards the end of the survey (similar to 20 degrees N) with the dinoflagellates as the most abundant group. Productivity of phytoplankton assemblages coincided with Chl a concentration, and decreased accordingly from 9.24 +/- 0.71 to 2.87 +/- 0.41 mg C l(-1) day(-1), then increased to 5.45 +/- 1.1 mu g C l(-1) day(-1). Chl a concentration and productivity were significantly correlated (P < 0.05) with microplankton cell abundance, as well as nutrient concentrations, which appeared to exert a strong influence over latitudinal variation in primary production.
TL;DR: Overall, species diversity and evenness indices showed downward trends during the study period and the bloom frequency of Scrippsiella trochoidea (associated with red tides) has increased rapidly since the 2000s in the inner bay.
TL;DR: In this paper, the authors focused on the short-term variability of a zooplankton community and compared its differences at the outflow of a nuclear power plant (ONPP), in a marine cage-culture area (MCCA) and in unpolluted waters (UW) from 28 April to 1 June 2001.
01 Jan 1984
TL;DR: What Is Plankton?
Abstract: What Is Plankton? Sampling Fixation and Preservation of Samples Observation and Identification Processing and Measurements Rearing and Culture Feeding Respiration and Excretion Productivity Distribution and Community Structure References Appendix Index
TL;DR: Despite their low energy density, the contribution of jellyfish to the energy budgets of predators may be much greater than assumed because of rapid digestion, low capture costs, availability, and selective feeding on the more energy-rich components.
Abstract: The past 30 years have seen several paradigm shifts in our understanding of how ocean ecosystems function Now recent technological advances add to an overwhelming body of evidence for another paradigm shift in terms of the role of gelatinous plankton (jellyfish) in marine food webs Traditionally viewed as trophic dead ends, stable isotope analysis of predator tissues, animal-borne cameras, and DNA analysis of fecal and gut samples (metabarcoding) are all indicating that many taxa routinely consume jellyfish Despite their low energy density, the contribution of jellyfish to the energy budgets of predators may be much greater than assumed because of rapid digestion, low capture costs, availability, and selective feeding on the more energy-rich components Feeding on jellyfish may make marine predators susceptible to ingestion of plastics
TL;DR: It was revealed that socio-economic development was associated with the PFAS contamination in coastal regions of South China, and significant correlations between concentration of total PFASs with gross domestic product (GDP) per capita and population density were found in the areas, suggesting that the influence of intense human activities in these areas may have resulted in higherPFAS contamination to the adjacent environment.
TL;DR: The results suggest that today, microplastic ingestion by salps has minimal impact on the biological pump, however, under futuremicroplastic concentrations (or in areas such as convergent zones), microplastics may have the potential to lower the efficiency of the Biological pump.
Abstract: The impacts of microplastics on some individual organisms have been well studied but what is less clear is what impacts microplastics have on wider ecosystem processes. Using salps as model organisms, we studied the effect of microplastic ingestion on the downward flux of high-density particulate organic matter in the form of salp faecal pellets. While to date most microplastic studies used virgin microplastics at unrealistic environmental concentrations here we exposed Salpa fusiformis to fractured and UV exposed polyethylene and polystyrene microplastics possessing a biofilm. It was found that when exposed to environmentally relevant concentrations, reported for the Mediterranean and the South Pacific Gyre, only few faecal pellets had microplastics incorporated within them. Under potential future scenarios, however, up to 46% of faecal pellets contained microplastics. Incorporated microplastics significantly altered the size, density and sinking rates of salp faecal pellets ( p-value < 0.05 in each instance). Sinking rates decreased by 1.35-fold (95% CI = 1.18, 1.56) for faecal pellets with polyethylene microplastics and 1.47-fold (95% CI = 1.34, 1.61) for polystyrene. These results suggest that today, microplastic ingestion by salps has minimal impact on the biological pump. However, under future microplastic concentrations (or in areas such as convergent zones), microplastics may have the potential to lower the efficiency of the biological pump.