Introduction to the Freshwater Algae

Freshwater algae are ubiquitous on a global scale, with dozens, even hundreds of thousands of species.

For simplicity, the algae of this book is treated the same as the text of the latest algae (eg Graham et al.

2008; Li, 2008); that is, they are considered to have all or most of the loose (multilinear) biota.

The following features: aquatic organisms, photosynthesis (containing chlorophyll a), simple trophic structure, no blood vessel -

Single cell: A species that develops as an isolated cell, it can be immobile or mobile, the latter one or

Form Dunaliella (flagellar green algae) is a single cell with two identical flagella. F. Ochromonas sp. Golden unicellular algae

4. Filament: a cell chain or a series of cells in which cells are connected end to end and adjacent cells share a common cell.

From a stream with a fast stream. H. Zygnema sp. (Conjugated green algae), unbranched filament not containing a gelatinous matrix. I. Limnoraphis sp. Filamentous

Cyanobacteria (cyanobacteria) are widely seen in freshwater environments, from single cell types such as Synechococcus (almost invisible in light microscopy - Figures 16 and 31) to large colony algae such as Microcystis (Figure 1). 34) and Anabena (Figure 24a). The latter large colonies are easy to see with the naked eye and show simple spherical or filiform morphology with large amounts of mucus. The balance of photosynthetic pigment present in blue-green algae (Table 3) varies with spectrum and intensity, producing various colors ranging from brown to bluish green (Figure 24a). Phycobiliprotein dyes are particularly striking, and phycocyanins tend to be superior to phycoerythrin at low light levels, making the cells blue - the typical green of these algae. Therefore it is advantageous to observe the material from shadows and good illumination conditions as much as possible.

Algae reproduction or algal propagation is a rapid increase or accumulation of algal population in a freshwater or seawater system and is identified by discoloration of water in the pigment. Previously, since cyanobacteria were mistaken for algae, cyanobacteria flowers were sometimes called algae. Flowers that may harm animals and ecosystems are called "harmful algae mass breeding" (HAB) and lead to death of fish, cities cutting water for residents, or countries where fisheries must be closed There is a possibility.

Algae are an important part of the aquatic ecosystem and are the foundation of the lake's food chain. There are many kinds of algae commonly found in freshwater in New York. The most common type of HAB consists of numerous cyanobacteria (also known as blue-green algae). Individual algae cells can not be seen with the naked eye, but under certain conditions they may agglomerate to form large visible colonies called flowers.