What affects zooplankton abundance?
The content of suspended matter, including plankton, bacteria, organic debris and inorganic particles, was the main food source of zooplankton. Therefore, the abundance of zooplankton was positively correlated with it. The pH value of water also had an impact on zooplankton.
What is the most abundant group in zooplankton?
Among these are the copepods, which are small (1-2 mm long) aquatic crustaceans, and are generally the most abundant zooplankton species (Figure 1).
How is zooplankton abundance measured?
Therefore, in the present study, zooplankton biomass, which is expressed as mg/m3 was calculated according to the formula: B = W / V where B is the zooplankton biomass (mg) and W is the weight of the sampled and V is the filtered water volume (m3).
Where is plankton most abundant?
Phytoplankton are most abundant (yellow, high chlorophyll) in high latitudes and in upwelling zones along the equator and near coastlines. They are scarce in remote oceans (dark blue), where nutrient levels are low.
What are factors that can affect the abundance and distribution of plankton in aquatic ecosystem?
The abundance of phytoplankton in aquatic can fluctuate in type and amount due to differences in nutrient content. Predation by zooplankton or herbivorous fish and tidal occurrence of sea water. Tides can affect plankton abundance and distribution. In high tide conditions.
What affects phytoplankton abundance?
Finally, it is concluded that, increase of water temperature and nutrient in Spring are both essential factors, which cause increasing of phytoplankton abundance and diversity.
Is zooplankton evenly distributed throughout the ocean?
Just as any species can be limited within a geographical region, so are zooplankton. However, species of zooplankton are not dispersed uniformly or randomly within a region of the ocean. As with phytoplankton, ‘patches’ of zooplankton species exist throughout the ocean.
Where are zooplankton found?
Freshwater zooplankton are found in the water in wetland areas such as lakes, tarns, streams and swamps. They are most abundant nearer the surface as they eat phytoplankton (microscopic plants) which need light to photosynthesise. Many species move into shallower waters at night.
How is biomass of zooplankton measured?
For each layer you divide the total number of individuals and the total biomass (biovolume, wet mass, dry mass or carbon) by the volume of water (m3) filtered. If you have measured biovolume then divide Volume of zooplankton (ml) by volume of filtered water (m3).
What tool do scientists use to measure phytoplankton abundance on large spatial scales?
Flow cytometry was used as a reference approach to estimate the abundance of phytoplankton species based on their fluorescence emissions.
How is phytoplankton distributed?
The patterns of distribution of phytoplankton that we observe are related to both physical and biological processes. The most likely explanation is that the warmer the surface waters become, the less mixing there is between those waters and deeper, more nutrient-rich water.
Why is plankton abundance important?
Zooplankton can be used as an indicator of water pollution (table 3). Rotifera is commonly found in freshwater ecosystems and plays an important role in the food chain as a natural food of shrimp and fish larvae. This high abundance of Rotifera can be attributed to the high abundance of phytoplankton in the upstream.
What influences zooplankton species distribution and abundance in Harapan Lake?
Overall, zooplankton species distribution and abundance in the study sites are influenced by various environmental factors such as water transparency and chlorophyll-acontent. Keywords: Zooplankton, Harapan Lake, Aman Lake, Rotifera, Brachionus INTRODUCTION
What are the characteristics of zooplankton community structure?
In general, the characteristics of zooplankton community structure are characterised by the intrinsic factors including surface area, depth, trophic level, colour of water, and the biological community of the lake (Rahkola-Sorsa 2008). Thus, these creatures can be a useful tool for the determination of ecological status of a lake.
What are the most common types of zooplankton in freshwater?
In this context, the present study was devoted to identify the three most common types of freshwater zooplankton; cladocerans, copepods, and rotifers in the eutrophic man-made lakes. We also aim to establish the degree of association between physical environmental variables and the species abundance in the zooplankton assemblages.
What is the most abundant zooplankton in Lake Rotifera?
Rotifera was the highest abundance group represent 64% of the total species recorded followed by Copepoda (29%) and Cladocera (7%). Three dominant zooplankton that been recorded in both the lakes are Brachionus forficula, Brachionus nilsoni, and Trichocerca sp.