Epiphytic Algae Composition and Biodiversity in Auda Marsh / Southern of Iraq

The present work included qualitative study of epiphytic algae on dead and living stems, leaves of the aquatic plant Phragmitesaustralis Trin ex Stand, in Tigris River in AL- Jadria Site in Baghdad during Autumn 2014, Winter 2015, Spring 2015, and Summer 2015. The physical and chemical parameters of River’s water were studied (water temperature, pH, electric conductivity, Salinity, TSS, TDS, turbidity, light intensity, dissolve oxygen, BOD5, alkalinity, total hardness, calcium, magnesium and plant nutrient). A total of 142 isolates of epiphytic algae were identified. Diatoms were dominant by 117 isolates followed by Cyanobacteria (13isolates), Chlorophyta (11 isolates) and Rhodophyta (1 isolate), Variations in the isolates number were recorded on different parts of macrophyte host as well as, indifferent seasons. Eight new algal isolates (Achnanthesexigue var. heterovalvata Krasske, Navicula exilissima Grunow, Navicula falaisiensis var lanceola Grunow, Navicula microcephalo Grunow, Pleurosigma obscurum W. Smith, Stauroneis amphioxys var. amphioxys Gregory, Stenopterobia intermedia Lewis and Audouinella hermannii Roth).were identified as new records.

Download Full-text

Snail communities improve submerged macrophytes growth by graze epiphytic algae and phytoplankton in a mesocosm experiment

10.22541/au.162035852.26305238/v1 ◽

2021 ◽

Author(s):

Tian Lv ◽

Xin Guan ◽

Shufeng Fan ◽

Chunhua Liu

Keyword(s):

Native Plants ◽

Submerged Macrophytes ◽

Mesocosm Experiment ◽

Snail Species ◽

Complex Relationship ◽

Elodea Nuttallii ◽

Submerged Plant ◽

Epiphytic Algae ◽

Complex Architecture ◽

The Relationship

The relationship between producers (e.g., macrophyte, phytoplankton and epiphytic algae) and snails plays an important role in maintaining the function and stability of the shallow ecosystems. A complex relationship exists among macrophytes, epiphytic algae, phytoplankton and snails. An outdoor mesocosm experiment with two-way factorials was carried out, three species submerged macrophytes (Hydrilla verticillate, Vallisneria natans or one exotic submerged plant Elodea nuttallii) and two grazing treatments (4 snail species present or absent) to elucidate those relationships. The results showed that the snail communities reducing the biomass of phytoplankton and epiphytic algae indirect then enhanced the growth of the submerged macrophytes. The macrophyte with complex architecture supported more snail and epiphytic algae, and snails preferred to feed on native plants. Competition drove snails change the grazing preferences to achieve coexistence, so that led to the assembling of snail communities towards the direction of highest resource utilization.

Download Full-text

Species Composition of Algal Epiphyton of Pink Lotus (Nymphaea pubescens Willd) Found in Laguna de Bay (Philippines)

Walailak Journal of Science and Technology (WJST) ◽

10.48048/wjst.2020.5015 ◽

2019 ◽

Vol 17 (3) ◽

pp. 237-256

Author(s):

Eldrin De Los Reyes ARGUELLES

Keyword(s):

Species Composition ◽

The Philippines ◽

Freshwater Ecosystems ◽

Taxonomic Study ◽

Habitat Distribution ◽

Epiphytic Algae ◽

Freshwater Habitats ◽

Laguna De Bay ◽

Root Tissues ◽

First Time

In spite of the fact that epiphytic algae are considered an important component of freshwater ecosystems, our knowledge of their diversity and distribution is still rather poor. Taxonomic study on the composition of epiphytic algae living on submerged leaf and root tissues of macrophyte Nymphaea pubescens Willd, found at Laguna de Bay (Philippines), was conducted. In total, 21 algal taxa were identified: 10 Cyanophyceae, 6 Trebouxiophyceae, and 5 Bacillariophyceae. The taxa described in this study represent 13 orders, 16 families, 18 genera, and 21 species based on the recent combined taxonomical approach. Of these taxa, the occurrence of a rare cyanobacteria, Chroococcus schizodermaticus West, is reported for the first time in the Philippines. One species is also reported here for the first time in the Philippines, based on current taxonomic nomenclature, and this is Cyanothece aeruginosa (Nägeli) Komárek, which is based on the former name of Synechococcus aeruginosus Nägeli. These taxonomic records are considered important basal information in enriching the knowledge about the diversity and habitat distribution of cyanobacteria and microalgae in macrophytes found in freshwater habitats in the Philippines.

Download Full-text

Epiphyton of oligotrophic lakes of Leningrad region

Issues of modern algology (Вопросы современной альгологии) ◽

10.33624/2311-0147-2021-1(25)-71-79 ◽

2021 ◽

pp. 71-79

Author(s):

Elena V. Stanislavskaya

Keyword(s):

Community Structure ◽

Dominant Species ◽

Taxonomic Composition ◽

Species Level ◽

Taxonomic Structure ◽

Leningrad Region ◽

Oligotrophic Lakes ◽

Epiphytic Algae ◽

Lake Ecosystems ◽

Epiphytic Communities

Here are results of investigation of taxonomic composition, community structure and dominant species of epiphytic algae in 12 oligotrophic lakes located in different geomorphic regions of Leningrad region. In summer epiphytic communities there were 385 algal taxa, they belonged to 6 taxonomic divisions: Cyanophyta (Cyanoprokaryota) – 50 (13%), Bacillaryophyta – 175 (45%), Chlorophyta – 37 (10%), Charophyta – 118 (30%), Xanthophyta – 4 (1,55%), Rhodophyta – 1 (0,45%). The taxonomic structure of each lake was predominant diatoms and desmids, but the biomass was dominated by zygnems and green algae. In total, the taxonomic composition of the epiphyton in the studied lakes is similar, the differences are revealed at the species level. The structure of dominanting epiphyton complex was rather constant and composed by a small number of species. The greatest contribution to the epiphyton was made by Tabellaria flocculosa and species of the genus Bulbochaete. The structure of the epiphyton reflects the undisturbed nature of lake ecosystems, as well as their northern location.

Download Full-text

The extent of grazing release from epiphytism forSargassum muticum(Phaeophyceae) within the invaded range

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315408003226 ◽

2009 ◽

Vol 89 (2) ◽

pp. 303-314 ◽

Cited By ~ 17

Author(s):

James A. Strong ◽

Christine A. Maggs ◽

Mark P. Johnson

Keyword(s):

Northern Ireland ◽

Native Species ◽

Sargassum Muticum ◽

Saccharina Latissima ◽

Native Range ◽

Epiphytic Algae ◽

Macroalgal Species ◽

Strangford Lough ◽

Fucus Serratus ◽

Japan And China

The overall biotic pressure on a newly introduced species may be less than that experienced within its native range, facilitating invasion. The brown algaSargassum muticum(Yendo) Fensholt is a conspicuous and successful invasive species originally from Japan and China. We comparedS. muticumand native macroalgae with respect to the biotic pressures of mesoherbivore grazing and ectocarpoid fouling. In Strangford Lough, Northern Ireland,S. muticumthalli were as heavily overgrown with seasonal blooms of epiphytic algae as native macroalgal species were. The herbivorous amphipodDexamine spinosawas much more abundant onS. muticumthan on any native macroalga. When cultured with this amphipod,S. muticumlost more tissue than three native macroalgae,Saccharina latissima(Linnaeus) Laneet al.,Halidrys siliquosa(Linnaeus) Lyngbye andFucus serratusLinnaeus.Sargassum muticumcultured with both ectocarpoid fouling and amphipods showed a severe impact, consistent with our previous findings of large declines in the density ofS. muticumobserved in the field during the peak of fouling. Despite being a recent introduction into the macroalgal community in Strangford Lough,S. muticumappears to be under biotic pressure at least equal to that on native species, suggesting that release from grazing and epiphytism does not contribute to the invasiveness of this species in Strangford Lough.

Download Full-text