Phytoplankton photoadaptation during the spring period in Lake Zürich

1995 ◽  
Vol 32 (4) ◽  
pp. 59-62 ◽  
Author(s):  
Ferdinand Schanz ◽  
Judith Burri
Keyword(s):  
Species Composition ◽  
Light Availability ◽  
Plankton Community ◽  
Short Term ◽  
Spring Period ◽  
Constant Structure ◽  
Phytoplankton Communities ◽  
Lake Zürich

Long- and short-term photoadaptations as a response to increased light availability in spring phytoplankton communities in Lake Zürich have been investigated. At various stages fundamental changes in species composition and species adaptation in a plankton community of approximately constant structure were apparent.

Effects of Calcite Treatment on Primary Producers in Acidified Adirondack Lakes. II. Short-Term Response by Phytoplankton Communities

1989 ◽  
Vol 46 (2) ◽  
pp. 352-359 ◽  
Author(s):  
Paul A. Bukaveckas
Keyword(s):  
Species Composition ◽  
Water Column ◽  
Biomass Productivity ◽  
Phytoplankton Production ◽  
Short Term ◽  
Phytoplankton Communities ◽  
Posttreatment Period ◽  
Adirondack Lakes ◽  
Treatment Changes ◽  
Term Response

The effects of calcite addition on two acidic Adirondack lakes were studied by investigators participating in the Lake Acidification Mitigation Project. Changes in phytoplankton biomass, productivity, and species composition were monitored during the ice-free period prior to and following lake treatment. Changes in water chemistry following limestone addition were largely restricted to the upper water column since calcite particles applied to the lake surface did not effectively penetrate the thermocline. Increased phytoplankton production and biomass were observed during the posttreatment period. Phytoplankton densities and rates of production were similar in both the neutralized (pH > 7.5) and acidic (pH < 5.5) portions of the water column; however, species composition was markedly different. The phytoplankton assemblage of the upper water column was largely comprised of chlorophytes and chrysophytes which had not been observed prior to treatment. In contrast, the deep-water assemblage comprised many of the same taxa that had been dominant during the pretreatment periodsss.

Environmental control of short-term variation in the plankton community of inner Tokyo Bay, Japan

2008 ◽  
Vol 78 (4) ◽  
pp. 796-810 ◽  
Author(s):  
Toru Nakane ◽  
Kisaburo Nakaka ◽  
Heather Bouman ◽  
Trevor Platt
Keyword(s):  
Environmental Control ◽  
Plankton Community ◽  
Tokyo Bay ◽  
Short Term ◽  
Term Variation

scholarly journals Quantifying phytoplankton communities using spectral fluorescence: the effects of species composition and physiological state

2014 ◽  
Vol 37 (1) ◽  
pp. 233-247 ◽  
Author(s):  
Nicolas Escoffier ◽  
Cecile Bernard ◽  
Sahima Hamlaoui ◽  
Alexis Groleau ◽  
Arnaud Catherine
Keyword(s):  
Species Composition ◽  
Physiological State ◽  
Phytoplankton Communities

THE LONG-TERM EFFECTS OF FERTILIZER APPLICATION AND THREE ROTATIONS ON WEED COMMUNITIES IN WHEAT (AFTER 21–22 YEARS AT INDIAN HEAD, SASKATCHEWAN)

1982 ◽  
Vol 62 (3) ◽  
pp. 741-750 ◽  
Author(s):  
LARRY HUME
Keyword(s):  
Species Composition ◽  
Fertilizer Application ◽  
Continuous Cropping ◽  
Long Term Effects ◽  
Canada Thistle ◽  
Short Term ◽  
Weed Communities ◽  
Green Foxtail ◽  
Lamb’S Quarters

The effect of fertilizer application and three rotations (continuous cropping, fallow-wheat, and fallow-wheat-wheat rotations) on the species composition of the weed community was examined using rotations that had been running for 21–22 yr at Indian Head, Saskatchewan. Before spring seeding, stinkweed and lamb’s-quarters were more abundant on wheat after fallow than they were on either wheat following wheat after fallow or on continuous cropping. After seeding, continuous cropping produced the largest weed densities of green foxtail, thyme-leaved spurge, and vetch. In most instances, Canada thistle was most abundant on continuously cropped and nonfertilized plots. After spring seeding, green foxtail was the only species with a larger density on fertilized plots. Interactions between fertilizer application and rotation, and among species, influenced species composition in the weed community. Fertilizer application tended to reduce community differences between continuous cropping and short-term wheat-fallow rotations. Allelopathic effects of Canada thistle may have reduced green foxtail and redroot pigweed densities. With the use of 2-or 3-yr wheat-fallow rotations and herbicide application, weed problems can be minimized in southeastern Saskatchewan.

scholarly journals BLACK ALDER DOMINATED FOREST VEGETATION IN THE WESTERN PART OF CENTRAL SLOVAKIA – SPECIES COMPOSITION AND ECOLOGY

Hacquetia ◽  
2013 ◽  
Vol 12 (2) ◽  
pp. 23-37
Author(s):  
Richard Hrivnák ◽  
Jaroslav Košťál ◽  
Michal Slezák ◽  
Anna Petrášová ◽  
Melánia Feszterová
Keyword(s):  
Species Composition ◽  
Expert Knowledge ◽  
Light Availability ◽  
Principal Component ◽  
Environmental Parameters ◽  
Soil Surface ◽  
Open Water ◽  
Forest Vegetation ◽  
Data Set ◽  
Black Alder

Abstract In some regions of Slovakia, black alder forest vegetation has not been documented appropriately yet. This paper is the first vegetation study presenting the phytosociological data and measured environmental parameters from the western part of central Slovakia. The data set was classified by using a modified TWINSPAN algorithm, which allowed us to discern floristically and ecologically distinctive plant communities. They correspond to the associations Stellario nemorum-Alnetum glutinosae Lohmeyer 1957 (riparian alder vegetation on mesic to humid sites along small brooks) and Carici acutiformis-Alnetum glutinosae Scamoni 1935 (eutrophic black alder carr forests in the colline zone) with the variants of Ligustrum vulgare and Galium palustre. The community Carici elongatae-Alnetum glutinosae Schwickerath 1933 (mesotrophic to eutrophic alder carr vegetation growing on permanently waterlogged soils), documented only with two phytosociological relevés, was distinguished following expert knowledge. A floristic and ecological pattern of these associations is presented. The major compositional gradients were interpreted based on Ellenberg’s indicator values and the values of environmental variables recorded during the field sampling in the growing season 2011. The principal component analysis revealed the importance of soil moisture, light availability, portion of open water and soil surface for species composition variability at the association level, whereas the variants of Carici acutiformis-Alnetum glutinosae were sorted along the acidity gradient.

Phytoplankton species turnover controlled by physical forcing at different time scales

2008 ◽  
Vol 65 (1) ◽  
pp. 47-60 ◽  
Author(s):  
Alexandrine Pannard ◽  
Myriam Bormans ◽  
Yvan Lagadeuc
Keyword(s):  
Species Composition ◽  
Time Scale ◽  
Phytoplankton Community ◽  
Diversity Index ◽  
Species Turnover ◽  
Rate Of Change ◽  
Original Structure ◽  
Short Term ◽  
Physical Forcing ◽  
Physical And Chemical

Changes in the physical and chemical environment induced by forcing events such as wind and rain can control the short-term dynamics of the phytoplankton community of inland waters. In two temperate reservoirs, species composition, diversity index, and species dynamics were characterized over periods of 3 weeks during different seasons, in parallel with changes in the physical and chemical structure of the water column. Dominant species and diversity index were shown to be controlled by environmental factors fluctuating on a seasonal and weekly time scale, whereas some rarer species responded to wind events and were indicators of a very short-term environmental change. As a consequence of the response of indicator species, the rate of change in species composition increased following meteorological events. Shifts in species composition were observed during each sampling period, except during the strongest stratification period. The shifts were associated with a modification of resource availability or intensity of stratification. We found that the resistance of the phytoplankton community to short-term physical forcing by wind increased with intensity of stratification. After the forcing event, the community did not return to its original structure because of modifications of the physical and chemical conditions induced by meteorological forcing on a weekly time scale.

scholarly journals Short-term effects of canopy and surface fire on centipede (Chilopoda) communities in a semi natural Mediterranean forest

2009 ◽  
Vol 20 (3) ◽  
Author(s):  
Emiliano Trucchi ◽  
Monica Pitzalis ◽  
Marzio Zapparoli ◽  
Marco Bologna
Keyword(s):  
Species Composition ◽  
Mediterranean Coast ◽  
Tree Canopy ◽  
Pitfall Trapping ◽  
Short Term ◽  
Surface Fire ◽  
Composition And Structure ◽  
Dominance Structure ◽  
Composition Structure ◽  
Species Composition And Structure

Species composition and structure of centipede (Chilopoda) communities were studied in a sub-urban burnt forest on the Mediterranean coast near Roma, Italy. The study was carried out in two sites affected by canopy fire (complete vegetation destruction), one affected by surface fire (persistence of tree canopy), and three unburnt sites. Monthly, quantitative/qualitative samplings were performed in each site from April 2001 to April 2002 by pitfall trapping and one hour active search. Analyses of species composition, dominance structure, diversity and colonization progress were performed. Centipede communities of the sites affected by canopy fire were simply structured, poor in both species richness and diversity; conversely, species composition, structure and diversity of the community affected by surface fire were scarcely modified.

Seasonal Response and Recovery of Eelgrass (Zostera marina) to Short-Term Reductions in Light Availability

2019 ◽  
Vol 43 (1) ◽  
pp. 120-134 ◽  
Author(s):  
Melisa C. Wong ◽  
Gwendolyn Griffiths ◽  
Benedikte Vercaemer
Keyword(s):  
Zostera Marina ◽  
Light Availability ◽  
Short Term ◽  
Response And Recovery
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