Fluctuations of phytoplankton biomass and its composition in a subarctic lake during summer

1975 ◽  
Vol 53 (19) ◽  
pp. 2240-2246 ◽  
Author(s):  
Robert G. Sheath ◽  
Mohiuddin Munawar ◽  
Johan A. Hellebust
Keyword(s):  
Species Composition ◽  
Phytoplankton Biomass ◽  
Benthic Algae ◽  
Early Summer ◽  
Mixed Population ◽  
High Biomass ◽  
Major Species ◽  
Algal Groups ◽  
Subarctic Lake ◽  
Plankton Species

Phytoplankton biomass was determined for a shallow subarctic lake from June to August, 1973, with one peak being observed at the beginning of July (300 mg m−3). Phytoplankton then declined until the end of August when a relatively high value of 240 mg m−3 was observed. The Chlorophyta and Diatomeae were the dominant taxa during periods of high biomass, whereas other algal groups had relative increases only during the minima. The early summer population was almost entirely composed of diatoms, followed by a mixed population of diatoms and cryptomonads, and then by the Chlorophyta, which dominated during midsummer. Subsequently, there were successive increases of chrysomonads, dinoflagellates, and then diatoms. Fluctuations of major species were examined in relation to changes in biomass of the algal groups. Net plankton species were dominant throughout most of the summer but nanoplankters were abundant for short periods in mid-June and July. Based on a few comparisons done in July, it was found that the species composition of phytoplankton was not similar to that of the benthic algae since only 15% of the species were common to both habitats and these species contributed to 21% of the phytoplankton biomass estimated.

Benthic algae in littoral and profundal areas of a deep subarctic lake

1981 ◽  
Vol 59 (6) ◽  
pp. 1026-1033 ◽  
Author(s):  
James W. Moore
Keyword(s):  
Species Composition ◽  
Relative Abundance ◽  
Deep Water ◽  
Benthic Algae ◽  
Common Species ◽  
Low Light ◽  
Nitzschia Palea ◽  
Light Levels ◽  
Subarctic Lake ◽  
Achnanthes Minutissima

Collections of benthic algae were made in an isolated subarctic lake during July and August 1975. Samples were taken from 30 stations situated at depths of 0.1 to 35 m. The number of species associated with sediments declined with depth from 66 to 22 m. Achnanthes minutissima, Navicula pupula, Cymbella spp., and Nostoc pruniforme reached greatest relative abundance in shallow water whereas Nitzschia palea and Nitzschia dissipata were relatively common below 20 m. Amphora ovalis, Gyrosigma spenceri, and Tabellaria flocculosa did not exhibit a consistent distribution pattern. Standing crops of the epipelon ranged from3 × 106 cells cm−2 (8.5 × 10 μm3 cm−2) at a depth of 0.1–5 m to8 × 103 cells cm−2 (7 × 106 μm3 cm−2) below 20 m. Low light levels, and to a lesser degree, temperature were the most important factors influencing the diversity, species composition, and density of the epipelon in deep water.The epipsammic community consisted of 10 species at all depths. Although Achnanthes pinnata was rare in deep water, the relative abundance of other common species (Amphora ovalis var. pediculus, Fragilaria construens var. venter, and Achnanthes minutissima) was constant at all stations. Standing crops varied from 3.5 × 104 cells cm−2 (39 × 106 μm3 cm−2) at 0.1–5 m to0.3 × 104 cells cm−2 (0.3 × 106 μm3 cm−2) below 20 m. Although low light levels probably controlled densities in deep water, physical characteristics of the substrate determined the diversity and species composition of the community.

Species composition and dispersal of nuisance flies breeding on egg farms in southern Australia

2017 ◽  
Vol 57 (1) ◽  
pp. 170 ◽  
Author(s):  
P. J. James ◽  
C. Krawec ◽  
N. A. Schellhorn ◽  
P. C. Glatz ◽  
P. M. Pepper
Keyword(s):  
Species Composition ◽  
Early Summer ◽  
Main Peak ◽  
House Flies ◽  
Stable Flies ◽  
Major Species ◽  
Dispersal Distances ◽  
Food Safety Risk ◽  
Trap Catches ◽  
Fannia Canicularis

The vectorial and dispersal capacities of flies make them a biosecurity and food safety risk on egg farms. The design of optimal control and biosecurity programs requires knowledge of species composition and patterns of abundance of the fly populations present. Although there have been many studies of flies breeding on egg farms in other countries there is little information available in Australia. We monitored numbers and species of flies breeding on cage egg farms in southern Australia and used mass marking with fluorescent resin dye to assess the dispersal of the major species from one of the farms. The main peak in fly numbers occurred in spring and early summer and was comprised predominantly of little house flies (Fannia canicularis). Significant numbers of false stable flies (Muscina stabulans) were trapped near accumulated manure, but relatively low numbers were present in bird housing areas. House flies (Musca domestica) were found in only low numbers or were absent at most times of the year. In the dispersal studies, 85% of marked F. canicularis and 67% of marked M. stabulans were trapped within 255 m of the layer sheds. The greatest distance from the farm at which marked F. canicularis flies were captured was 739 m for traps and 1.25 km for tapes whereas M. stabulans flies were trapped at all distances including in the most distant trap nearly 2 km from the farm. Modelling of trap catches by distance predicted maximum dispersal distances of 1.6 km for F. canicularis and 2.4 km for M. stabulans.

A Lakewide Comparison Study of Phytoplankton Biomass and its Species Composition in Lake Huron, 1971 to 1985

1991 ◽  
Vol 17 (4) ◽  
pp. 553-564 ◽  
Author(s):  
Joseph C. Makarewicz ◽  
Paul Bertram
Keyword(s):  
Species Composition ◽  
Phytoplankton Biomass ◽  
Lake Huron ◽  
Comparison Study

Impacts of golf course construction and operation on headwater streams: bioassessment using benthic algae

2003 ◽  
Vol 81 (8) ◽  
pp. 848-858 ◽  
Author(s):  
Jennifer G Winter ◽  
Peter J Dillon ◽  
Carolyn Paterson ◽  
Ron A Reid ◽  
Keith M Somers
Keyword(s):  
Nutrient Enrichment ◽  
Headwater Streams ◽  
Benthic Algae ◽  
Golf Course ◽  
Golf Courses ◽  
Algal Communities ◽  
Precambrian Shield ◽  
Filamentous Green Algae ◽  
Algal Groups ◽  
Under Construction

The influence of golf course operation and construction on benthic algal communities in headwater streams on the Precambrian Shield was investigated using a reference condition approach. Streams were sampled for water chemistry and epilithic benthic algae on operational golf courses, on courses under construction, and from nearby minimally impacted reference locations. Epilithic diatom community structure was different in reference streams than in operational golf course streams, the latter indicating nutrient enrichment, higher pH, and disturbance. Full counts of diatoms and soft algae revealed that there was a lower proportion of diatoms relative to other algal groups, cyanobacteria in particular, in operational golf course streams compared with samples from reference locations. Dominance by a single taxon was also significantly higher in operational golf course streams. Although differences relative to the reference streams were less marked for the streams on courses under construction, full counts of diatoms and soft algae provided evidence of disturbance and nutrient enrichment. In particular, high proportions of filamentous green algae were recorded. Overall, our results indicate that golf course land management on the Shield is associated with significant differences in the abundance of certain benthic algal taxa in headwater streams.Key words: diatoms, periphyton, biomonitoring, golf courses, canonical correspondence analysis (CCA), Precambrian Shield.

Effect of Water Body Morphology on Phytoplankton Biomass and Species Composition

2013 ◽  
Vol 777 ◽  
pp. 375-379
Author(s):  
Yue Hong Zhang ◽  
Fei Peng Li ◽  
Hu Hu Zhao ◽  
Hai Ping Zhang
Keyword(s):  
Species Composition ◽  
Water Body ◽  
Environmental Variables ◽  
Phytoplankton Biomass ◽  
Population Variation ◽  
Nutrient Concentrations ◽  
Body Morphology ◽  
Key Factor ◽  
Lake Type ◽  
River Type

Environmental variables, phytoplankton biomass and species composition in Nanhu Lake in Yingdong Village, Chongming Island were monitored from August 2010 to September 2011. The relationship between environmental variables and population variation of phytoplankton was discussed. The results showed that water body morphology was the key factor leading to the variation of phytoplankton community. In river-type waters the level of phytoplankton biomass was generally higher than that in lake-type waters, especially in summer. During the period of seasonal change, in river-type waters Cyanophyta dominated longer with the succession from Cyanophyta to Chlorophyta and Bacillariophyta occurred later than that in lake-type waters. Redundancy analysis (RDA) indicated that the morphology of enclosed waters had influence on phytoplankton biomass and species composition. One of the mechanisms may be that water body morphology could have impact on the growth and species dynamics of phytoplankton indirectly by affecting nutrient concentrations.

Horizontal transport and the distribution of nutrients in the Coastal Transition Zone off northern California: Effects on primary production, phytoplankton biomass and species composition

1991 ◽  
Vol 96 (C8) ◽  
pp. 14833 ◽  
Author(s):  
Francisco P. Chavez ◽  
Richard T. Barber ◽  
P. Michael Kosro ◽  
Adriana Huyer ◽  
Steven R. Ramp ◽  
...  
Keyword(s):  
Species Composition ◽  
Primary Production ◽  
Transition Zone ◽  
Phytoplankton Biomass ◽  
Northern California ◽  
Horizontal Transport

Seasonal Occurrence of Adult Carabid Beetles (Coleoptera: Carabidae) in West-Central Illinois

2020 ◽  
Vol 55 (3) ◽  
pp. 329-343
Author(s):  
Kenneth W. McCravy ◽  
Jason E. Willand
Keyword(s):  
Species Richness ◽  
Species Composition ◽  
Tallgrass Prairie ◽  
Activity Patterns ◽  
Species Abundance ◽  
Abundant Species ◽  
Early Summer ◽  
Carabid Beetles ◽  
West Central ◽  
Central Illinois

Abstract The Carabidae is a diverse family of beetles with many species of interest in conservation and biological control. Carabid beetle adult seasonal activity patterns were studied in a west-central Illinois forest/reconstructed tallgrass prairie matrix over a 2-yr period using pitfall traps. We found a threefold or greater difference in carabid abundance between years. Despite lower abundance, a second year of sampling yielded seven previously undetected species. Abundance and species richness were greatest in May–July and lower in August–October. Relative abundance and species richness were consistent among months between years. Shannon diversity and effective number of species were lowest in June and July. Cyclotrachelus sodalis (LeConte) and Chlaenius platyderus Chaudoir were the two most abundant species, comprising 54.3% of total captures. These species were most abundant in July and June, respectively. Most species showed greatest abundance in spring or early summer, and declined thereafter. Collections of several species were suggestive of bimodal seasonal patterns. Carabid species composition differed significantly among months, but not between years. Our results document seasonal variation in carabid abundance and species composition, and show that sampling throughout the growing season, and multiple sampling years, provide substantial benefits for assessments of carabid diversity in this region.

scholarly journals Limnological changes in Dom Helvécio Lake (South-East Brazil): natural and anthropogenic causes

2010 ◽  
Vol 70 (3 suppl) ◽  
pp. 795-802 ◽  
Author(s):  
PM. Maia-Barbosa ◽  
LG. Barbosa ◽  
SL. Brito ◽  
F. Garcia ◽  
CFA Barros ◽  
...  
Keyword(s):  
Species Composition ◽  
Fish Species ◽  
Environmental Data ◽  
Exotic Fish ◽  
Biological Features ◽  
Physical Chemical ◽  
Exotic Fish Species ◽  
Plankton Species

In order to verify changes in physical, chemical and biological features of Dom Helvécio Lake (South-East Brazil), this study compares previous and recent data obtained from limnological investigations over three decades. Plankton species composition and density together with environmental data from 1978, 1983, and during 1999 to 2006 showed changes driven by seasonal climatic forces or by anthropogenic causes. Changes in diversity are shown as a consequence of alternation of rainy and dry periods and introduction of exotic fish species. Finally, suggestions are made for improving conservation efforts in the area, through planned actions and monitoring programmes.

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