نتایج جستجو برای: phytoplankton indices

تعداد نتایج: 95102  

2015
Lixia Niu

There is an increasing concern about the interactions between phytoplankton and coastal ecosystems, especially on the negative effects from coastal eutrophication and phyto-plankton blooms. As the key indicator of the coastal ecosystem, phytoplankton plays an important role in the whole impact-effect chain. Primary production by phytoplankton forms the basic link in the food-chain. A lot of eff...

Journal: :Aquatic sciences and engineering 2021

The littoral and limnetic phytoplankton of ‘soft de-mineralized water’ in the Nongmahir reservoir Meghalaya state northeast India (NEI) reveal a fairly diverse assemblage total 52 species, depict higher richness Chlorophyta desmids, record speciose constellation 51 species per sample. Phytoplankton form dominant quantitative component net plankton indicate differential spatial dominance importa...

ژورنال: بوم شناسی آبزیان 2023

In this study, the trophic status of the Bustan dam reservoir was investigated using Palmer and Carlson indices. Biological parameters including phytoplankton and environmental factors such as phosphate, nitrate and chlorophyll were sampled at the depth of 0.5 meter in five stations in three replicates seasonally in 2019, repetitions and Then the Palmer and Carlson indices were determined. The ...

2017
Małgorzata Loga Anna Wierzchołowska-Dziedzic

Measurement uncertainties are inherent to assessment of biological indices of water bodies. The effect of these uncertainties on the probability of misclassification of ecological status is the subject of this paper. Four Monte-Carlo (M-C) models were applied to simulate the occurrence of random errors in the measurements of metrics corresponding to four biological elements of surface waters: m...

2008
Lisa V. Lucas Janet K. Thompson Larry R. Brown

Transport time scales such as flushing time and residence time are often used to explain variability in phytoplankton biomass. In many cases, empirical data are consistent with a positive phytoplankton–transport time relationship (i.e., phytoplankton biomass increases as transport time increases). However, negative relationships, varying relationships, or no significant relationship may also be...

A Makhlough A. G Leroy .Suzanne F Eslami H Nasrollahzadeh Saravi,

Phytoplankton study has become more significant in the Caspian Sea due to the occurrence of ecological events such as algal blooms and the introduction of the invader species(Ctenophore, Mnemiopsis leidyi). A seasonal study was conducted to investigate the features of phytoplankton community one decade after this invasion in the Iranian coast of Caspian Sea during 2009-2010. According to the re...

ژورنال: بوم شناسی آبزیان 2023
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The aim of this study was to investigate the changes in the structure of the plankton community in the southwestern Caspian Sea and its relationship with the reduction of Rutilus frisii and Chelon auratus catches. The current study was conducted seasonally in the coasts of Guilan provience from 2020 to 2021. A total number of 48 genera and species of phytoplanktons were identified. Tthe finding...

F. Mohsenizadeh, Kh. Aein Jamshid , S. Omidi,

The aim of this work was to be informed and aware of the red tide conditions before the entering of algal blooms in seawater supply canals of the shrimp farm and hatchery complexes in Bushehr Province. Field investigations and monthly samplings have been carried out to determine environmental parameters, nutrients, chlorophyll–a and phytoplankton in the southern part of the input water ch...

ژورنال: زیست شناسی دریا 2020
Ganjian Khenari, Ali , Oskoein, Roghayeh , Zakerimehr, Mohammad Reza ,

Phytoplankton plays an important role in the material cycle and energy flow of the ecosystem, Therefore in this study, the distribution, frequency, and biodiversity of phytoplankton in Elimalat Lake were investigated. Sampling was performed in Elimalat Lake sessonally, located in Nur City, Mazandaran province, in 2019. In this study, 70 species of phytoplankton were classified into 5 phylum ...

2013
Hideyuki Doi Kwang-Hyeon Chang Yuichiro Nishibe Hiroyuki Imai Shin-ichi Nakano

The importance of analyzing the determinants of biodiversity and community composition by using multiple trophic levels is well recognized; however, relevant data are lacking. In the present study, we investigated variations in species diversity indices and community structures of the plankton taxonomic groups-zooplankton, rotifers, ciliates, and phytoplankton-under a range of local environment...

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