scholarly journals Ecology of testate amoebae (Protists) inSphagnumpeatlands of eastern Poland: Vertical micro-distribution and species assemblages in relation to environmental parameters

2009 ◽  
Vol 45 (1) ◽  
pp. 41-49 ◽  
Author(s):  
Tomasz Mieczan
Keyword(s):  
Environmental Parameters ◽  
Testate Amoebae ◽  
Species Assemblages

Relationship between testate amoebae (Protozoa: Rhizopoda) and microenvironmental parameters on a forested peatland in northeastern Ontario

1992 ◽  
Vol 70 (12) ◽  
pp. 2474-2482 ◽  
Author(s):  
D. J. Charman ◽  
B. G. Warner
Keyword(s):  
Transfer Functions ◽  
Vegetation Type ◽  
Environmental Parameters ◽  
Testate Amoebae ◽  
Species Assemblages ◽  
Individual Species ◽  
Moss Species ◽  
Wide Range ◽  
Moisture Conditions ◽  
Forested Peatland

The relative abundance of species of testate amoebae (Testacea; Rhizopoda) was established from 107 surface moss samples from a forested peatland in northeastern Ontario. These were related by multivariate analysis to a number of microenvironmental conditions including soil moisture content, water table, bulk density, humification, dominant peat component, pH, peat depth, depth of living moss, dominant surface moss species, vegetation type, microtopographical position, and artificial drainage. Moisture conditions play a key role in determining the species assemblages, pH being a secondary factor. Other environmental parameters related to species assemblages do not necessarily indicate a direct ecological link but are also associated with moisture and nutrient conditions. Individual species are ranked in terms of their preferred moisture conditions and compared with data from Finland. Certain species are restricted to either dry or wet conditions while others tolerate a wide range of moisture. Calculating weighted averages of substrate moisture contents for a greater range of species sampled from a larger number of sites will allow the development of transfer functions for constructing palaeomoisture curves from peatlands.

Spatial patterns of meiofauna and diversity of nematode species assemblages in the Uvea lagoon (Loyalty Islands, South Pacific)

2008 ◽  
Vol 88 (5) ◽  
pp. 931-940 ◽  
Author(s):  
Y. Guo ◽  
M.-N. Helleouet ◽  
G. Boucher
Keyword(s):  
Species Richness ◽  
Spatial Patterns ◽  
Environmental Parameters ◽  
Nematode Species ◽  
Abundant Species ◽  
Diversity Indices ◽  
Species Assemblages ◽  
Leeward Side ◽  
Local Composition ◽  
Total Species Richness

Meiofauna assemblages were investigated at 15 stations on triplicated samples in the Uvea Atoll (Loyalty Islands) in relation to 9 selected environmental parameters. Spatial patterns and variability of meiofauna density were quantified according to location, macrofauna and nematode species assemblages. Meiofauna was dominated by ciliates and nematodes. Densities of total meiofauna and of most of the meiofauna taxa were significantly higher in the back reef North Pléiades stations than the leeward side of the Island. The highest correlation between biotic patterns and environmental parameters that best explains the pattern was with sediment thickness and to a lesser extent organic matter, C/N ratio and depth. One hundred and thirty-four nematode species were identified with four dominant species Chromadora macrolaimoides, an undescribed species of Bolbonema, Daptonema svalbardense and Prochromadorella septempapillata. Three significantly different nematode species assemblages were detected in two of the previously described macrofauna assemblages by cluster analysis and multidimensional scaling methods suggesting that nematodes are more sensible ecological indicators than macrofauna. Diversity indices based on dominance were not significantly different among the three nematode species assemblages but indices based on species richness and rarefaction were significantly higher leeward of Uvea Island. Estimates of total species richness showed no sign of stabilizing with sample size. However, rare species stabilized very quickly, whereas abundant species were added with increasing sampling coverage, indicating a high spatial variability of the local composition of nematodes.

The biodiversity of testate amoebae within the Mediteranean region of Israel

2015 ◽  
Vol 61 (1) ◽  
pp. 13-20
Author(s):  
Xin Dai ◽  
Lian-Yu Jiang ◽  
Ai-Qin Wang ◽  
Wan-Hong Wei ◽  
Sheng-Mei Yang
Keyword(s):  
New Species ◽  
Sea Level ◽  
Diversity Index ◽  
Testate Amoebae ◽  
Species Assemblages ◽  
Tel Aviv ◽  
Α Diversity ◽  
The Mediterranean ◽  
Taxonomic Studies ◽  
First Time

The species composition of testate amoebae was studied for the first time in the northern and central parts of Israel. One hundred and eight species and infra-species taxa of Testacea belonging to 18 genera and 10 families were identified in 68 samples. The materials were collected along a transect in the Mediterranean phyto-geographical region of Israel, from Mt. Hermon 2100 m above sea level (part of the Anti-Lebanon Mt. Ridge), to the Sea of Galilee 200 m below sea level to the Mediterranean sea shore near Tel Aviv. All the species identified are Holarctic, most of them cosmopolitan. Some of the sampled testaceans require additional taxonomic studies and are possibly new species endemic to the country. A low α-diversity index was demonstrated for the specimens collected in the humid and swampy habitats, while the majority of the species assemblages, mainly eury-bionts, were similar among habitats.

Summer mesozooplankton distribution in coastal waters of central Greece (eastern Mediterranean). II. Species assemblages

2005 ◽  
Vol 85 (4) ◽  
pp. 765-774 ◽  
Author(s):  
Alexis Ramfos ◽  
Stylianos Somarakis ◽  
Constantin Koutsikopoulos ◽  
Nina Fragopoulu
Keyword(s):  
Eastern Mediterranean ◽  
Zooplankton Community ◽  
Environmental Parameters ◽  
Common Species ◽  
Taxonomic Composition ◽  
Coastal Areas ◽  
Species Assemblages ◽  
Species List ◽  
Central Greece ◽  
Zooplankton Communities

Mesozooplankton distribution was investigated over an intensive grid of 124 stations in coastal and pelagic waters of central Greece (eastern Mediterranean) during July 1998. The complex topography of the area consisted of various semi-enclosed gulfs as well as open-sea areas and provided excellent fieldwork for determining species assemblages, their relationships to environmental parameters and the distribution and abundance patterns of the copepod species.Three coastal and one pelagic group of stations were revealed by cluster analysis. Inverse analysis of species affinities defined distinct ‘coastal’ and ‘pelagic’ species assemblages. All coastal areas were dominated by a small number of species (e.g. Penilia avirostris, Podon spp., Ctenocalanus vanus, Paracalanus parvus and Centropages typicus) all belonging to the ‘coastal’ assemblage. Differences among these coastal areas were mainly due to small changes in relative abundance of a common-species list. On the contrary, pelagic stations were characterized by higher species diversity, low dominance and the presence of characteristic epipelagic and mesopelagic species of the Mediterranean Sea (e.g. Calocalanus spp., Haloptilus longicornis, Lucicutia flavicornis, Mecynocera clausi, Farranula rostrata, Mesocalanus tenuicornis and Oncaea mediterranea).The observed differences in taxonomic composition and abundance of zooplankton were related to the marked differences in salinity values observed between the eastern and western part of the surveyed area. Bathymetry, temperature and fluorescence were also related with the inshore–offshore gradient of the zooplankton community observed in the pelagic areas as well as with the discrimination of the zooplankton communities of the various semi-enclosed gulfs of the region.

scholarly journals Ecology of testate amoebae (Protists) in a Sphagnum-dominated peat bog and the relationship between species assemblages and environmental parameters

2016 ◽  
Vol 45 (3) ◽  
Author(s):  
Michał Niedźwiecki ◽  
Tomasz Mieczan ◽  
Małgorzata Adamczuk
Keyword(s):  
Seasonal Changes ◽  
Environmental Parameters ◽  
Testate Amoebae ◽  
Horizontal Distribution ◽  
Peat Bogs ◽  
Peat Bog ◽  
Factors Affecting ◽  
Structure Of Communities ◽  
Ecological Importance ◽  
The Relationship

AbstractDespite its ecological importance, little information is available regarding spatial and seasonal changes in the testate amoebae community in peat bogs. The objectives of this study were to examine the structure of communities and horizontal distribution of testate amoebae fauna, to improve the understanding of factors affecting the distribution of moss testate amoebae communities and to analyze the seasonal changes in testate amoebae communities in a Sphagnum-dominated peat bog (eastern Poland). A total of 45 testate amoebae species were identified in the samples. The highest species richness occurred in hollows dominated by

scholarly journals The distribution of ciliates on Ecology Glacier (King George Island, Antarctica): relationships between species assemblages and environmental parameters

Polar Biology ◽  
2012 ◽  
Vol 36 (2) ◽  
pp. 249-258 ◽  
Author(s):  
Tomasz Mieczan ◽  
Dorota Górniak ◽  
Aleksander Świątecki ◽  
Marek Zdanowski ◽  
Monika Tarkowska-Kukuryk
Keyword(s):  
Environmental Parameters ◽  
Species Assemblages ◽  
King George Island

HUBUNGAN KEPADATAN BIVALVIA DENGAN PARAMETER LINGKUNGAN DI PESISIR TANJUNG PURA KABUPATEN BANGKA TENGAH

2020 ◽  
Vol 13 (2) ◽  
pp. 112-121
Author(s):  
Sudiyar . ◽  
Okto Supratman ◽  
Indra Ambalika Syari
Keyword(s):  
Negative Impact ◽  
Principal Component ◽  
Environmental Parameters ◽  
Data Retrieval ◽  
Distribution Patterns ◽  
Random System ◽  
System Method ◽  
Relationship Of ◽  
The Relationship ◽  
Anadara Granosa

The destructive fishing feared will give a negative impact on the survival of this organism. This study aims to analyze the density of bivalves, distribution patterns, and to analyze the relationship of bivalves with environmental parameters in Tanjung Pura village. This research was conducted in March 2019. The systematic random system method was used for collecting data of bivalves. The collecting Data retrieval divided into five research stasions. The results obtained 6 types of bivalves from 3 families and the total is 115 individuals. The highest bivalve density is 4.56 ind / m², and the lowest bivalves are located at station 2,1.56 ind / m²,  The pattern of bivalve distribution in the Coastal of Tanjung Pura Village is grouping. The results of principal component analysis (PCA) showed that Anadara granosa species was positively correlated with TSS r = 0.890, Dosinia contusa, Anomalocardia squamosa, Mererix meretrix, Placamen isabellina, and Tellinella spengleri were positively correlated with currents r = 0.933.

Recirculation versus flow-through rainbow trout laboratory Flavobacterium columnare challenge

2020 ◽  
Vol 139 ◽  
pp. 213-221
Author(s):  
C Birkett ◽  
R Lipscomb ◽  
T Moreland ◽  
T Leeds ◽  
JP Evenhuis
Keyword(s):  
Rainbow Trout ◽  
Environmental Parameters ◽  
Cumulative Effects ◽  
Flavobacterium Columnare ◽  
Replacement Rate ◽  
Bacterial Concentration ◽  
Water Replacement ◽  
Dose Concentration ◽  
Flow Through ◽  
And Control

Flavobacterium columnare immersion challenges are affected by water-related environmental parameters and thus are difficult to reproduce. Whereas these challenges are typically conducted using flow-through systems, use of a recirculating challenge system to control environmental parameters may improve reproducibility. We compared mortality, bacterial concentration, and environmental parameters between flow-through and recirculating immersion challenge systems under laboratory conditions using 20 rainbow trout families. Despite identical dose concentration (1:75 dilution), duration of challenge, lot of fish, and temperature, average mortality in the recirculating system (42%) was lower (p < 0.01) compared to the flow-through system (77%), and there was low correlation (r = 0.24) of family mortality. Mean days to death (3.25 vs. 2.99 d) and aquaria-to-aquaria variation (9.6 vs. 10.4%) in the recirculating and flow-through systems, respectively, did not differ (p ≥ 0.30). Despite 10-fold lower water replacement rate in the recirculating (0.4 exchanges h-1) compared to flow-through system (4 exchanges h-1), differences in bacterial concentration between the 2 systems were modest (≤0.6 orders of magnitude) and inconsistent throughout the 21 d challenge. Compared to the flow-through system, dissolved oxygen during the 1 h exposure and pH were greater (p ≤ 0.02), and calcium and hardness were lower (p ≤ 0.03), in the recirculating system. Although this study was not designed to test effects of specific environmental parameters on mortality, it demonstrates that the cumulative effects of these parameters result in poor reproducibility. A recirculating immersion challenge model may be warranted to empirically identify and control environmental parameters affecting mortality and thus may serve as a more repeatable laboratory challenge model.

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