نتایج جستجو برای: phytoplankton indices
تعداد نتایج: 95102 فیلتر نتایج به سال:
In an effort to better portray changing health conditions in Chesapeake Bay and support restoration efforts, a Bay Health Index (BHI) was developed to assess the ecological effects of nutrient and sediment loading on 15 regions of the estuary. Three water quality and three biological measures were combined to formulate the BHI. Water quality measures of chlorophyll-a, dissolved oxygen, and Secc...
The impact of physico-chemical factors on percent coral cover and coral health was examined on a spatial basis for two dominant Acropora species, A. digitifera and A. spicifera, at Ningaloo Reef (north-western Australia) in the southeast Indian Ocean. Coral health was investigated by measuring metabolic indices (RNA/DNA ratio and protein concentration), energy levels (lipid ratio) and autotroph...
In this paper the dynamical behaviour of toxin producing phytoplankton and zooplankton system is investigated. The toxin producing phytoplankton are divided into two groups: susceptible phytoplankton and infected phytoplankton. Conditions of local stability of various equilibrium points are derived. Further it is observed that the range of toxin liberation parameter increases for the coexistenc...
Ebria tripartita (Schumann) Lemmermann, 1899, a non-photosynthetic flagellate was identified from the southern coast of the Caspian Sea in December 2012. Water temperature at the sampling time was 10 ºC. The abundance of total phytoplankton cells was 3 × 106 Cells.l-1, while E. tripartita with 2 × 10 3 Cells. l-1 included 0.75% of phytoplankton community. Water quality parameters were recorded...
In order to determine the water quality of Mert Stream, algal indicators and some biological indices (TDI, IDG, PTI, Palmer, DAIpo) based on phytoplankton species were used. Phytoplankton samples performed monthly from six different sites at a depth 0.5 meter using one-litre sampler between July 2011 June 2012. After placed in 250-mL dark bottles fixed with Lugol’s solution until processed labo...
Estuaries are one of the most productive aquatic ecosystems that both ecologically and economically are important. The study purposed to investigate the distribution and abundance of phytoplankton from Helleh river estuary (Boushehr- Persian Gulf). Samples were taken in mid-season from summer 2011 to spring 2012 for one year period. Results showed that the dissolved oxygen, temperature, salinit...
Many reports have demonstrated that the removal of aquaculture purse seine is conducive to restoration aquatic vegetation and improvement in water quality, but less attention has been paid effects on phytoplankton. This paper addressed response phytoplankton community structure after Caizi Lakes. The results showed average dissolved oxygen (from 7.43 ± 0.25 mg/L 9.12 0.49 mg/L) Secchi depth 28....
Recent theoretical and laboratory studies have suggested that unpalatable prey modify the degree to which trophic levels are regulated by bottom-up or top-down forces such that primarily edible communities are regulated by predation and primarily unpalatable communities are regulated by resource supply. Despite the hypothesised importance of prey edibility, experiments have only rarely examined...
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