نتایج جستجو برای: phytoplankton indices

تعداد نتایج: 95102  

2015
Anna Kozak Ryszard Gołdyn Renata Dondajewska

In this paper we present the effects of environmental factors and zooplankton food pressure on phytoplankton in the restored man-made Maltański Reservoir (MR). Two methods of restoration: biomanipulation and phosphorus inactivation have been applied in the reservoir. Nine taxonomical groups of phytoplankton represented in total by 183 taxa were stated there. The richest groups in respect of tax...

2009

To improve our mechanistic understanding and predictive capacities with respect to climate change effects on the spring phytoplankton bloom in temperate marine systems, we used a process-driven dynamical model to disentangle the impact of potentially relevant factors which are often correlated in the field. The model was based on comprehensive indoor mesocosm experiments run at four temperature...

2016
Sirpa Lehtinen Sanna Suikkanen Heidi Hällfors Pirkko Kauppila Maiju Lehtiniemi Jarno Tuimala Laura Uusitalo Harri Kuosa

Combining the existing knowledge on links between functional characteristics of phytoplankton taxa and food web functioning with the methods from long-term data analysis, we present an approach for using phytoplankton monitoring data to draw conclusions on potential effects of phytoplankton taxonomic composition on the next trophic level. This information can be used as a part of marine food we...

Journal: :Revista de biologia tropical 2014
Gerardo Umaña-Villalobos

Phytoplankton species show a variety in morphology which is the result of adaptations to pelagic life including responses to fluctuations in water column dynamics driven by weather conditions. This has been reported in the oceans and in Northern temperate lakes. In order to observe whether tropical freshwater phytoplankton responds to seasonal variation in weather, the weekly variation in tempe...

A. Makhlough, A.R. Keyhansani, F. Eslami, H. Nasrollahzadeh Saravi,

Nutrient enrichment in water and sediments due to excessive anthropogenic activities in recent years has caused excessive algal growth in the Caspian Sea. The current study was conducted to determine the abundance of phytoplankton community, the dominant species and chlorophyll-a [Chl-a] concentration during algal blooms in the Iranian coastal waters of Caspian Sea through four seasons from 201...

ژورنال: بوم شناسی آبزیان 2016

Golbolagh Reservoir is located the east of Kurdistan province with 8.1 Million cubic meters' capacity. This study was conducted for one year to investigate the population structure, diversity and seasonal change of phytoplankton of Golbolagh Lake. Some physicochemical parameters of this water body at each sampling site were studied. In this study, 6 phylum, 22 families and 23 genus of phytoplan...

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...

Journal: Pollution 2019

The experiment was performed to evaluate effect of heavy metals on total phytoplankton load (TPL) using water of Turag River adjacent to Ashulia locating on the north-eastern side of Dhaka city, Bangladesh. Total phytoplankton load comprises of Euglena sp., Borodinella sp., Pediastrum biradiatum, Pinnularia sp., Fragillaria sp., Fragillaria crotonensis, Gloeocapsa sp., Navicula sp., Cynedra sp....

2007
Julie M. Rose David A. Caron

Literature review and synthesis of growth rates of aquatic protists focused on the role of temperature in the formation of massive annual algal blooms in high-latitude ecosystems. Maximal growth rates of herbivorous protists equaled or exceeded maximal growth rates of phototrophic protists at temperatures above 15uC. Maximal growth rates of herbivorous protists declined more rapidly with decrea...

ژورنال: بوم شناسی آبزیان 2016
Gharaei, َAhmad, Karami, Roghaye, Keikha, Mehdi, Khandan Barani, Hashem, Miradr Harijani, Javad, Rahdari, Abdolali,

This study investigated seasonal changes in density and diversity of phytoplankton, chlorophyll a content, and some environmental characteristics in the Sistan region during 2014. Totally, we detected 28 genera that belonged to five groups of Chlorophyta (12 genera), Bacilloriophyta (7 genera), Cyanophyta (5 genera), Dinophyta (3 genera), and Euglenophyta (1 genus). We observed that Chlorophyta...

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