Species composition and distribution of free-living nematodes in lakes and streams.

2021 ◽  
pp. 58-108
Author(s):  
Walter Traunspurger ◽  
Nabil Majdi
Keyword(s):  
Species Composition ◽  
Vertical Distribution ◽  
Water Chemistry ◽  
Flow Rate ◽  
Water Depth ◽  
Heterotrophic Microbes ◽  
Rivers And Streams ◽  
Distributional Patterns ◽  
Species Composition And Distribution ◽  
Temperature Water

Abstract This chapter provides an overview of the distributional patterns of nematodes in lakes, rivers, and streams worldwide and of the factors that affect the structuring of nematode communities in the field. Drivers of variability in species composition such as habitat texture, flow rate, temperature, water chemistry, oxygen, vertical distribution of nematodes in the sediment, water depth in lakes, microphytobenthos, macrophytes, heterotrophic microbes, interspecific competition, and predation, are discussed.

scholarly journals Environmental factors that influence species diversity of floodplain plant communities in different flooding phases in the Okavango Delta, Botswana

Bothalia ◽  
2020 ◽  
Vol 50 (Volume 50 No. 1) ◽  
Author(s):  
Gaolathe Tsheboeng ◽  
Mphaphi Bonyongo ◽  
Mike Murray-Hudson
Keyword(s):  
Environmental Factors ◽  
Species Composition ◽  
Plant Communities ◽  
Water Depth ◽  
Environmental Variables ◽  
Okavango Delta ◽  
Before And After ◽  
Okavango River ◽  
Flooding Duration ◽  
Species Composition And Distribution

Background and objectives: Species composition and distribution in seasonal floodplain plant communities are influenced by variation in flooding. However, the influence of intra-flooding variation phases on the diversity of seasonal floodplain plant communities has not been studied in the Okavango Delta. The objective of this study was to investigate environmental factors that influence species composition and distribution of seasonal floodplain communities before and after flooding. It was hypothesised that environmental factors that influence the species composition and distribution in seasonal floodplain communities will vary with intra-flooding seasons. Methods: Flooding depth was measured in May (before flooding) and September (flood recession/after flooding) in forty 25 m2 plots. Flooding duration was recorded as the number of weeks in which the plots were inundated. The soil was sampled before and after floods and analysed for pH, extractable P, K, Mg, Ca and Na. Plant identification and estimation of percentage cover were done in the 25 m2 plots in which environmental variables were sampled. The relationship between environmental variables and seasonal floodplain plant community composition and distribution was sought using Non-metric Multi-dimensional Scaling. Paired Student’s t test was used to compare the means of environmental variables before and after flooding. Results: Factors that influenced the distribution of species before flooding were Na, K, water depth and flooding duration. After flooding, the factors that influenced species composition and distribution were K, Na, Mg, pH, water depth and flooding duration. Conclusion: These results suggest that during flooding K and Mg are deposited in the floodplains due to lateral water flow. Our results also suggest that any water abstraction from the Okavango River Basin should take into consideration the importance of flooding duration and depth in sustaining species composition and distribution of seasonal floodplain plant communities so that such developments do not disturb the ecological functioning of the Delta.

scholarly journals Observations on aerophytic cyanobacteria and algae from ten caves in the Ojców National Park

2013 ◽  
Vol 66 (1) ◽  
pp. 39-52 ◽  
Author(s):  
Joanna Czerwik-Marcinkowska
Keyword(s):  
Species Composition ◽  
Vertical Distribution ◽  
Chlorella Vulgaris ◽  
National Park ◽  
Nostoc Commune ◽  
Algal Communities ◽  
Microclimatic Conditions ◽  
Species Composition And Distribution ◽  
Cyanobacteria And Algae ◽  
Klebsormidium Flaccidum

This study, carried out in 2010–11, focuses on species composition and distribution of cyanobacterial and algal communities colonizing ten caves (Biała, Ciemna, Koziarnia, Krakowska, Łokietka, Okopy Wielka Dolna, Sąspowska, Sypialnia, Zbójecka and Złodziejska Caves) in the Ojców National Park (South Poland). A total of 85 taxa were identified, 35 of them belonging to cyanobacteria, 30 chlorophytes, and 20 belonging to other groups of algae. Aerophytic cyanobacteria dominated in these calcareous habitats. Nine species, <em>Gloeocapsa alpina, Nostoc commune, Chlorella vulgaris, Dilabifilum arthopyreniae, Klebsormidium flaccidum, Muriella decolor, Neocystis subglobosa, </em>and <em>Orthoseira roseana</em>, were the most abundant taxa in all the caves. The investigated microhabitats offer relatively stable microclimatic conditions and are likely to be responsible for the observed vertical distribution of aerophytic cyanobacteria and algae.

Species composition and distribution of marine macro algae at Co To and Thanh Lan archipelago

2020 ◽  
Vol 20 (3) ◽  
pp. 267-276
Author(s):  
Dam Duc Tien ◽  
Nguyen Thi Mai Anh ◽  
Linh Manh Nguyen ◽  
Pham Thu Hue ◽  
Lawrence Liao
Keyword(s):  
Species Composition ◽  
Littoral Zone ◽  
Marine Algae ◽  
Similarity Coefficient ◽  
Algal Flora ◽  
Average Value ◽  
Site Number ◽  
Species Composition And Distribution ◽  
Total Species ◽  
Macro Algae

This paper exhibites species composition and distribution of marine seaweed at 10 sites of Co To and Thanh Lan islands in May 2019. The studies record 76 species of marine algae in the area, belonging to four divisions: Cyanophytes, Rhodophytes, Ochrophytes and Chlorophytes. Among them, five species are classified into Cyanophytes (comprising 6.6% of total species); thirty-four species into Rhodophytes (44.7%); twenty-one species into Ochrophytes/Phaeophytes (27.6%) and sixteen species into Chlorophytes (21.1%). The species composition of marine seaweeds in Co To and Thanh Lan shows significant differences as follows: 22 species (sites number 4 and 10) to 58 species (site number 2) and the average value is 38.7 species per site. Sørensen similarity coefficient fluctuates from 0.33 (sites number 5 and 10) to 0.84 (sites number 1 and 3) and the average value is 0.53. The current investigations show that four species of twenty-one species are collected in the littoral zone and forty-two species in the sub-littoral zone (in which there are thirteen species distributed in both littoral zone and sub-littoral zone). The algal flora in Co To and Thanh Lan is characterized by subtropics.

Changes in the species composition and distribution of butterflies (Rhopalocera) in Cracow (Poland) since the mid-19th century

2005 ◽  
Vol 48 (2) ◽  
pp. 181-215 ◽  
Author(s):  
Edward Palik ◽  
Łukasz Przybyłowicz ◽  
Andrzej Kosior ◽  
Wiesław Król ◽  
Wojciech Solarz ◽  
...  
Keyword(s):  
Species Composition ◽  
19Th Century ◽  
Species Composition And Distribution

SPECIES COMPOSITION AND DISTRIBUTION OF DIATOMS IN SURFACE SEDIMENTS OF THE BERING SEA

2013 ◽  
Vol 24 (4) ◽  
pp. 331-338
Author(s):  
Lixia Shao ◽  
Rongcheng Lin ◽  
Yahui Gao ◽  
Dingyong Huang
Keyword(s):  
Species Composition ◽  
Bering Sea ◽  
Surface Sediments ◽  
Species Composition And Distribution ◽  
The Bering Sea

Anuran Species Composition and Distribution Patterns in Brazilian Cerrado, a Neotropical Hotspot

2012 ◽  
Vol 7 (2) ◽  
pp. 63-78 ◽  
Author(s):  
Paula Hanna Valdujo ◽  
Débora Leite Silvano ◽  
Guarino Colli ◽  
Marcio Martins
Keyword(s):  
Species Composition ◽  
Distribution Patterns ◽  
Brazilian Cerrado ◽  
Anuran Species ◽  
Species Composition And Distribution
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