Distribution and abundance of periphyton and phytoplankton species in two subarctic Canadian rivers

1982 ◽  
Vol 60 (3) ◽  
pp. 224-236 ◽  
Author(s):  
G. L. Ennis ◽  
L. J. Albright
Keyword(s):  
Green Algae ◽  
Abundant Species ◽  
Red Alga ◽  
High Flow ◽  
Phytoplankton Species ◽  
Periphytic Diatoms ◽  
Fragilaria Crotonensis ◽  
Unidentified Species ◽  
Abundant Phytoplankton ◽  
Achnanthes Minutissima

Periphytic and planktonic algal populations were sampled over a yearly cycle in the Ogilvie and Swift rivers located in the northern and southern Yukon, respectively. Diatoms and green algae dominated periphytic assemblages during spring, summer, and fall, whereas the bulk of the overwintering cells was diatoms. The 96 species of periphytic diatoms were dominated by Achnanthes minutissima Kütz., an unidentified species of Achnanthes, Cocconeis placentula Ehr., Diatoma hiemale var. mesodon (Ehr.) Grun., Diatoma tenue var. elongatum Lyngb., Anomoeoneis vitrea (Grun.) Ross, and Fragilaria crotonensis Kitton. Most diatoms encountered are also generally abundant in more temperate locations. Periphytic green algae were dominated by Mougeotia sp., Oedogonium sp., Ulothrix sp., and Stigeoclonium sp. In high flow regions of the Ogilvie River the red alga Lemanea fucina Bory was extremely abundant. Phytoplankton was sparse and generally represented by the same species as found in periphytic habitats. Results indicate that the phytoplankton cells were probably derived from sloughed periphytic cells. Achnanthes minutissima, Diatoma tenue var. elongatum, Fragilaria construens var. binodis (Ehr.) Grun., Fragilaria vaucheriae (Kütz.) Peters, and Synedra ulna (Nitz.) Ehr. were the most abundant species in the plankton.

scholarly journals Epipelic Algae in Hemren Reservoir , Iraq

2007 ◽  
Vol 4 (2) ◽  
pp. 208-214
Author(s):  
Baghdad Science Journal
Keyword(s):  
Seasonal Variation ◽  
Cell Density ◽  
Green Algae ◽  
Blue Green Algae ◽  
Nitzschia Palea ◽  
Two Peaks ◽  
Achnanthes Minutissima

The study includes the epipelic algae in Hemren reservoir, for the period between Januarys to October 2000 .The samples were collected from three selected sites at north, middle and south of reservoir. A total of 96 taxa of epipelic algae were identified. The diatoms were the dominated by 82 taxa represented 85.4% of the total identified species, followed by blue-green algae (cyanophyta) of 6.3 taxa (6%), and then green algae (chlorophyta) of 5.2 taxa (5%). One species was recorded for each crysophyta, euglenophyta and pyrrophyta. The seasonal variation for the cell density showed two peaks during spring and autumn seasons. Few species were dominated during the most studied period such as Achnanthes minutissima, Navicula cryptocephala, N. cryptocephala var . veneta and Nitzschia palea .

scholarly journals Cyclonerane Derivatives from the Algicolous Endophytic Fungus Trichoderma asperellum A-YMD-9-2

Marine Drugs ◽  
2019 ◽  
Vol 17 (5) ◽  
pp. 252 ◽  
Author(s):  
Yin-Ping Song ◽  
Feng-Ping Miao ◽  
Xiang-Hong Liu ◽  
Xiu-Li Yin ◽  
Nai-Yun Ji
Keyword(s):  
Endophytic Fungus ◽  
Structural Diversity ◽  
2D Nmr ◽  
Red Alga ◽  
Gracilaria Verrucosa ◽  
Marine Phytoplankton ◽  
Spectroscopic Techniques ◽  
Phytoplankton Species ◽  
Trichoderma Asperellum ◽  
Potent Inhibition

Seven previously unreported cyclonerane derivatives, namely, 3,7,11-trihydroxycycloneran-10-one, cycloneran-3,7,10,11-tetraol, cycloneran-3,7,11-triol, 11,12,15-trinorcycloneran-3,7,10-triol, 7,10S-epoxycycloneran-3,15-diol, 7,10R-epoxycycloneran-3,15-diol, and (10Z)-15-acetoxy-10-cycloneren-3,7-diol, were isolated in addition to the known (10Z)-cyclonerotriol, (10E)-cyclonerotriol, catenioblin C, and chokol E from the culture of Trichoderma asperellum A-YMD-9-2, an endophytic fungus obtained from the marine red alga Gracilaria verrucosa. The structures of previously unreported compounds were established by spectroscopic techniques, including 1D/2D NMR, MS, and IR. The isolation of these new cyclonerane derivatives greatly adds to the structural diversity of unusual cyclonerane sesquiterpenes, and several isolates exhibit potent inhibition against some marine phytoplankton species.

scholarly journals Marine algae of St. Martin's Island, Bangladesh. XII. New records of red and green algae

1970 ◽  
Vol 40 (1) ◽  
pp. 41-45
Author(s):  
Abdul Aziz ◽  
Md Towhidur Rahman
Keyword(s):  
Key Words ◽  
Green Algae ◽  
Marine Algae ◽  
New Records ◽  
Red Alga ◽  
First Time

Ceramium tenerrimum (G. Martens) Okamura fa, Caulerpa sertularioides fa corymbosa Taylor and Cladophora vagabunda (L.) Hoek from St. Martin’s Island, Bangladesh have been recorded, and described and illustrated for the first time with descriptions and illustrations. Key words: Ceramium; Caulerpa; Cladophora; Red alga; Green algae; Bangladesh DOI: http://dx.doi.org/10.3329/bjb.v40i1.7996 Bangladesh J. Bot. 40(1): 41-45, 2011 (June)

Demographic responses of selected rotifers (Rotifera) and cladocerans (Cladocera) fed toxic Microcystis aeruginosa (Cyanobacteria)

2020 ◽  
Vol 193 (3) ◽  
pp. 261-274
Author(s):  
Alfredo Pérez-Morales ◽  
S.S.S. Sarma ◽  
S. Nandini ◽  
Cristian Alberto Espinosa-Rodríguez ◽  
Ligia Rivera-De la Parra
Keyword(s):  
Population Growth ◽  
Life Table ◽  
Microcystis Aeruginosa ◽  
Green Algae ◽  
Somatic Growth ◽  
Phytoplankton Species ◽  
Scenedesmus Acutus ◽  
Cladoceran Species ◽  
Toxic Cyanobacteria ◽  
Demographic Responses

Tropical waterbodies contain several species of toxic cyanobacteria including Microcystis, which adversely affect the somatic growth, survival and fecundity of zooplankton. Scenedesmus, one of the most common green algae, is even found in Microcystis -dominated waterbodies. It is, therefore possible that in natural ponds, rotifers and cladocerans feed on mixed phytoplankton species containing algae and cyanobacteria. In this work, we quantified demographic responses of three rotifer species (Brachionus calyciflorus, B. rubens, and Plationus patulus), and three cladoceran species (Simocephalus mixtus, Daphnia cf. mendotae and Moina macrocopa) fed toxic Microcystis aeruginosa only or mixed with Scenedesmus acutus. The highest population growth for both rotifer and cladoceran species was observed when Scenedesmus was offered alone or at 75 % of the diet. Daphnia cf. mendotae and B. rubens were less affected by Microcystis while M. macrocopa and B. calyciflorus were more adversely influenced, which was also corroborated by life table demography. In competition bioassays, D. cf. mendotae was more efficient, alone or in competition, when fed with 50 or 25 % of Microcystis. This work explains the dynamics of the zooplanktonic community against gradual changes in phytoplankton due to the presence of cyanobacteria.

scholarly journals Complete Sequence of the Mitochondrial DNA of the Red Alga Porphyra purpurea: Cyanobacterial Introns and Shared Ancestry of Red and Green Algae

1999 ◽  
Vol 11 (9) ◽  
pp. 1675-1694 ◽  
Author(s):  
Gertraud Burger ◽  
Diane Saint-Louis ◽  
Michael W. Gray ◽  
B. Franz Lang
Keyword(s):  
Mitochondrial Dna ◽  
Green Algae ◽  
Red Alga ◽  
Complete Sequence ◽  
Shared Ancestry ◽  
Porphyra Purpurea

scholarly journals Algal community composition within territories of the damselfish Stegastes nigricans (Pomacentridae, Labroidei) in Fiji and the Cook Islands

2005 ◽  
Vol 23 (1) ◽  
pp. 43 ◽  
Author(s):  
L W Zemke-White ◽  
E L Beatson
Keyword(s):  
Species Composition ◽  
Community Composition ◽  
Algal Species ◽  
Abundant Species ◽  
Red Alga ◽  
Algal Community ◽  
Filamentous Algae ◽  
Cook Islands ◽  
Algal Assemblages

The species composition of algal assemblages inside territories of the damselfish Stegastes nigricans was examined from Nananu-i-ra Island, Fiji and Rarotonga, Cook Islands. A total of 32 algal species were identified, the majority of them Rhodophytes (24 species). Seven species were unique to Rarotonga, six were unique to Fiji, with the remaining 19 species recorded at both locations. The biodiversity of territories was similar at both locations. The red alga, Herposiphonia secunda, was the most abundant species found, comprising 40.33% � 3.51SE and 33.94% � 3.58SE from Rarotonga and Fiji respectively. Gelidiopsis intricata, Polysiphonia sp., Aglaothamnion cordatum, and various Cyanophytes were also abundant at both locations. As a group, filamentous algae accounted for 70.35% of the algae found within the territories at all sites. We suggest that if S. nigricans are actively weeding their territories, they are selecting filamentous algae, and particularly Herposiphonia sp. and Polysiphonia sp.

scholarly journals Periphytic Diatoms in the Polluted Linggi (sensu stricto) and Kundor Rivers, Negeri Sembilan, Malaysia

2017 ◽  
Vol 32 (1) ◽  
pp. 60 ◽  
Author(s):  
I.S.A. NATHER KHAN
Keyword(s):  
Species Composition ◽  
Environmental Conditions ◽  
Abundant Species ◽  
Sensu Stricto ◽  
Diatom Assemblage ◽  
Artificial Substrates ◽  
Nitzschia Palea ◽  
Periphytic Diatoms ◽  
Species Composition And Distribution ◽  
Periphytic Diatom

The investigation in this paper aimed to describe periphytic diatom assemblage, species composition and distribution in tropical polluted Linggi (sensu stricto or s.s.) and Kundor rivers in  Negeri Sembilan, Malaysia.  Regardless of ecological and environmental conditions, diatoms were the numerically dominant flora among periphytic  algae  collected monthly over a period of 13 months at nine stations in the Linggi (s.s.) and Kundor rivers.  The freshwater periphytic diatom samples were collected mainly using artificial substrates and supplemented with natural substrates.  The periphytic diatoms thus collected from both natural and artificial substrates comprised 86 taxa (82 pennate and 4 centric forms) belonging to 21 genera. Of the 86 species, 71 species were found colonized in artificial substrates while the remaining 15 species were recorded exclusively on natural substrates. On the whole, the most common diatoms in both rivers combined were Eunotia vanheurckii, Gomphonema parvulum, Nitzschia palea, Pinnularia braunii, Navicula cryptocephala, Achnanthes saxonica, Achnanthes minutissima and Pinnularia microstauron.  The most abundant species were E. vanheurckii, N. palea, A. saxonica, G. parvulum and A. minutissima.

Extracellular phosphatase activity of freshwater phytoplankton exposed to different in situ phosphorus concentrations

2005 ◽  
Vol 56 (4) ◽  
pp. 417 ◽  
Author(s):  
A. Ŝtrojsová ◽  
J. Vrba ◽  
J. Nedoma ◽  
K. Ŝimek
Keyword(s):  
Enzyme Activity ◽  
Phosphatase Activity ◽  
Microcystis Aeruginosa ◽  
Image Cytometry ◽  
Phosphorus Concentration ◽  
Phytoplankton Species ◽  
Freshwater Phytoplankton ◽  
Fragilaria Crotonensis ◽  
Species Specific

Extracellular phosphatase production and biomass change were investigated in phytoplankton species transplanted from the phosphorus-limited dam area of a eutrophic reservoir and exposed to the phosphorus-sufficient inflow part and vice versa. Extracellular phosphatase activity was studied using the enzyme-labelled fluorescence (ELF) technique, allowing for direct microscopic detection of enzyme activity and, moreover, its quantification using image cytometry. Several phytoplankton species (e.g. Anabaena planctonica, Microcystis aeruginosa, Fragilaria crotonensis, Ankyra ancora and Planktosphaeria gelatinosa) regulated phosphatase activity according to external phosphorus concentration. On the contrary, picocyanobacteria and several green algae (Coelastrum microporum, Crucigeniella sp., Pediastrum tetras, and Staurastrum planctonicum) did not produce extracellular phosphatases at all. The species-specific extracellular phosphatase activity of F. crotonensis, A. ancora, and P. gelatinosa ranged between 0.02 and 3.5 fmol μm−2 h−1.

Ecological effects of flow disturbance on phytobenthos communities in natural and regulated alpine streams

2021 ◽  
Author(s):  
Luca Bonacina ◽  
Riccardo Fornaroli ◽  
Valeria Mezzanotte ◽  
Francesca Marazzi
Keyword(s):  
Green Algae ◽  
Low Frequency ◽  
High Flow ◽  
Tree Canopy ◽  
Trophic Levels ◽  
Algae Biomass ◽  
Flow Disturbances ◽  
Sampling Campaign ◽  
Alpine Streams ◽  
Taxonomic Groups

<p>Phytobenthos is the dominant primary producer in streams and sustains, with the allochthonous organic matter inputs, the higher trophic levels. Among the different groups that constitute the phytobenthos community some, especially diatoms, have been studied deeply while others remain quite overlooked. Hence, a characterisation of the overall phytobenthos community is needed, considering all the main taxonomic groups (diatoms, green algae, cyanobacteria and red algae), as related to the environmental conditions characterizing different alpine streams. Moreover, despite the ecological role played by the phytobenthos the knowledge about the factors that control the variations of the community among streams and throughout the different seasons is still poor. Among the different drivers that regulate the phytobenthos component, a pivotal factor is the occurrence of high-flow events that, controlling the stability of riverbed substrates, influences both the phyto and the zoobenthos composition and distribution. Thus, the frequency and the magnitude of flow disturbances are determinant in regulating the phytobenthos density and the recolonization patterns. The aim of this work was to characterize and compare the phytobenthos communities in different streams highlighting the role of the flow regulation due to hydropower reservoirs accounting for the influence of the lithology and the seasonality. The presented phytobenthos data derive from a one-year sampling campaign in four alpine streams representative of different flow conditions (natural vs regulated flow discharge) and lithology (silicate vs carbonate). The riverbed coverage has been estimated monthly in each stream and the biomass has been quantified. In lab, phytobenthos samples have been analysed to measure the photosynthetic activity and define their composition. The main groups (cyanobacteria, green algae, diatoms and algae with phycoerythrin) have been determined both by phyto-PAM deconvolution and by the quantification of the photosynthetic pigments. In order to estimate the bed disturbance, painted stones of different size classes were located in regular arrays along three transversal transects and the distance travelled was measured during every sampling. The preliminary results indicate that regulated streams seem characterized by a greater algae biomass possibly due to a more stable environment. Concerning the community composition, the percentage of diatoms is significatively higher in silicate substrates. Despite the few hours of light, winter promotes phytobenthos colonisation especially for the low frequency of relevant high-flow events but also for the absence of the shadow due to tree canopy on the riverbed.</p>

A Fateful Meeting of Two Phytoplankton Species—Chemical vs. Cell-Cell-Interactions in Co-Cultures of the Green Algae Oocystis marsonii and the Cyanobacterium Microcystis aeruginosa

2017 ◽  
Vol 74 (1) ◽  
pp. 22-32 ◽  
Author(s):  
Susanne Dunker ◽  
Julia Althammer ◽  
Georg Pohnert ◽  
Christian Wilhelm
Keyword(s):  
Microcystis Aeruginosa ◽  
Green Algae ◽  
Cell Interactions ◽  
Phytoplankton Species ◽  
Cell Cell
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