Species richness of microcrustacea in subterranean freshwater habitats. Comparative analysis and approximate evaluation

1997 ◽  
Vol 82 (2) ◽  
pp. 121-145 ◽  
Author(s):  
Raymond Rouch ◽  
Dan L. Danielopol
Keyword(s):  
Species Richness ◽  
Comparative Analysis ◽  
Approximate Evaluation ◽  
Freshwater Habitats

scholarly journals Ichthyofauna sampled with tadpoles in northeastern Maranhão state, Brazil

Check List ◽  
2015 ◽  
Vol 11 (1) ◽  
pp. 1550 ◽  
Author(s):  
Rodrigo Matavelli ◽  
Aldenise Martins Campos ◽  
João do Vale ◽  
Nivaldo Magalhães Piorski ◽  
Paulo Dos Santos Pompeu
Keyword(s):  
Species Richness ◽  
Atlantic Forest ◽  
River Basins ◽  
Fish Diversity ◽  
Estuarine Ecosystems ◽  
Lotic Habitats ◽  
Freshwater Habitats ◽  
High Fish ◽  
Study Species

The Neotropic region has high fish diversity associated with freshwater habitats. However, for Maranhão state, most publications on the ichthyofauna concentrate on coastal or estuarine ecosystems. In this study, species of fish were sampled in lentic and lotic habitats in Cerrado areas (Cerradão phytophysiognomy) and in restinga areas (Atlantic Forest phytophysiognomy) in northeastern Maranhão state between January and July 2010. Thirteen species from 10 families and 6 orders were captured. Species richness was highest for the orders Characiformes and Gymnotiformes. Our results are the first records of the ichthyofauna of coastal drainage areas of northeastern Maranhão state, contributing to the understanding of the biodiversity of the Munim and Parnaíba River basins, and suggest the existence of a community that shares elements with those of the Amazon and Caatinga biomes.

Advances in Understanding Landscape Influences on Freshwater Habitats and Biological Assemblages

2019 ◽  
Keyword(s):  
Species Richness ◽  
Site Selection ◽  
Catchment Area ◽  
Sampling Design ◽  
Environmental Gradients ◽  
Large Sample Size ◽  
Sample Sizes ◽  
Assemblage Composition ◽  
Landscape Gradients ◽  
Freshwater Habitats

<i>Abstract.</i>—Linking landscape features, both natural and human-altered, to aquatic ecosystem structure and function is a fundamental objective in landscape ecology and freshwater science, but this process is data- and resource-intensive. Quantifying how landscape stressors influence aquatic communities requires balancing logistic and financial constraints with effectively sampling the landscape to capture gradients of interest. There are a variety of ways to balance these constraints, such as using existing data, handpicked site selection, or a statistical site-selection scheme. Poor sampling design reduces statistical power; however, we do not know how differences in site-selection designs influence our ability to measure ecological responses to landscape gradients. We quantified how the distribution of sample sites across landscape gradients affected the measured responses of stream fish assemblages to these gradients at different sample sizes. Specifically, we used randomization tests to compare the variability in the responses of fish assemblage structure (species richness and composition) to catchment area and land use (agricultural land) with manipulated distributions (random, highly skewed, and uniform) of sites across these landscape gradients. Assemblage composition was more sensitive than species richness to sampling design, and we observed less variability in the detected response of assemblage composition when samples were distributed uniformly across landscape gradients, especially when sample sizes were small. Although strong responses to environmental gradients, such as species richness to catchment area, are robust to sampling distributions, large sample size and a uniform distribution of samples might help elucidate more subtle responses to environmental gradients.

scholarly journals Species richness and functional structure of fish assemblages in three freshwater habitats: effects of environmental factors and management

2019 ◽  
Vol 95 (4) ◽  
pp. 1125-1136 ◽  
Author(s):  
Jamile Queiroz‐Sousa ◽  
Sally A. Keith ◽  
Gianmarco S. David ◽  
Heleno Brandão ◽  
André B. Nobile ◽  
...  
Keyword(s):  
Species Richness ◽  
Environmental Factors ◽  
Fish Assemblages ◽  
Functional Structure ◽  
Freshwater Habitats

Comparative analysis of algal biodiversity in the rivers of Israel

2011 ◽  
Vol 6 (2) ◽  
pp. 246-259 ◽  
Author(s):  
Sophia Barinova ◽  
Alexey Petrov ◽  
Eviatar Nevo
Keyword(s):  
Species Richness ◽  
Comparative Analysis ◽  
Hierarchical Cluster ◽  
Organic Pollution ◽  
Taxonomic Resolution ◽  
Anthropogenic Factors ◽  
Taxonomic Distinctness ◽  
Arid Environments ◽  
Climatic Impact ◽  
Climatic Impacts

AbstractComparative analysis of algal communities in the rivers of Israel was completed to highlight the influence of environmental variables on biodiversity. The study revealed that 671 species of algae and cyanobacteria belonging to nine taxonomic divisions were present during 2002–2009 in the Yarqon, Alexander, Hadera, Qishon, Oren, Lower and Upper Jordan, and Zin rivers. The species richness of each river was evaluated by taxonomic structural comparison, geobotanical, hierarchical cluster analysis, and the degree of relatedness for different levels of taxonomic resolution. The analysis revealed close similarity of the Upper Jordan and Oren rivers. The average taxonomic distinctness index showed that the Yarqon, Oren, Upper Jordan, and Qishon communities were partly degraded due to permanent environmental disturbances. The variation in taxonomic distinctness index showed that the Alexander, Yarqon and Hadera communities were formed not only due to anthropogenic factors but also through long-term climatic impact. The most abundant indicator species inhabit low streaming and standing alkaline waters of medium salinity and low to medium organic pollution. The statistical approaches allowed discrimination between climatic and anthropogenic factors that impact upon the riverine biodiversity in semi-arid environments. Analysis shows the influence of anthropogenic factors was strongly modulated by climatic impacts causing a marked decease of species richness from north to south.

scholarly journals The genus Eunotia Ehrenb. (Bacillariophyta) in the Cheremsky Nature Reserve, Ukrainian Polissya, and refined terminology relevant to the raphe system morphology

PhytoKeys ◽  
2019 ◽  
Vol 128 ◽  
pp. 1-31
Author(s):  
Lyudmila N. Bukhtiyarova
Keyword(s):  
Species Richness ◽  
Nature Reserve ◽  
Indirect Evidence ◽  
Diatom Frustule ◽  
New Findings ◽  
The World ◽  
Different Types ◽  
Freshwater Habitats ◽  
High Species Richness ◽  
First Time

Numerous species of Eunotia Ehrenb., widely distributed in the world flora, prefer acidic, dystrophic or oligotrophic freshwater habitats with low conductivity and usually occur in epiphytic or epilithic hydrotopes. In Ukraine, only 32 species and eight varieties of Eunotia were known until this study. For the first time, 9 more species have been recorded mainly from the Cheremsky Nature Reserve, located in Ukrainian Polissya. New findings include 2 species widely distributed in the world flora on most continents and 7 rare species known from several locations, among them E.genuflexa, E.jarensis and E.ruzickae, which are probably European endemics as they have not been reported from other continents. For the present time in the Cheremsky Nature Reserve, the 20 species recorded here, the highest species richness of Eunotia in Ukraine, bring the total number of Eunotia in Ukraine to 41 species, which comprises only 7% of Eunotia species in the world flora. This is indirect evidence of insufficient investigation of the wetlands in Ukraine where Eunotia usually is represented with high species richness. Several definitions are suggested to describe morphological features that are peculiar to the diatom frustule particular to the Eunotia species. The genus Eunotia possesses a mirror-symmetric, mantle-offset, brevisslit raphe system, which may or may not have terminal raphe fissures. Morphological analysis provided in this study revealed the absence of terminal raphe fissures for many species of Eunotia. Instead, the distal ends of the raphe slits finish on the outer valve surface by funnel holes, sometimes pore-like ones, connected with the helictoglossae. However, in the literature those distal ends of the raphe slits were described erroneously as terminal raphe fissures. For the first time different types of raphe system are grounded. Two species Eunotiaimplicata Nörpel-Schempp et al. in Alles et al. and Eunotiaincisa W. Smith ex Gregory were lectotypified.

scholarly journals If you build it, they will come: rapid colonization by dragonflies in a new effluent-dependent river reach

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e9856
Author(s):  
Michael T. Bogan ◽  
Drew Eppehimer ◽  
Hamdhani Hamdhani ◽  
Kelsey Hollien
Keyword(s):  
Species Richness ◽  
Urban Development ◽  
Natural Habitat ◽  
Treated Wastewater ◽  
Santa Cruz ◽  
Assemblage Composition ◽  
Santa Cruz River ◽  
Freshwater Habitats ◽  
River Reach ◽  
Study Sites

Background Aquatic ecosystems are greatly altered by urban development, including the complete loss of natural habitat due to water diversions or channel burial. However, novel freshwater habitats also are created in cities, such as effluent-dependent streams that rely on treated wastewater for flow. It is unclear how diverse these novel ecosystems are, or how quickly aquatic species are able to colonize them. In this study, we (1) quantify odonate (Insecta, Odonata) colonization of a novel effluent-dependent river reach, (2) examine how drying events affect odonates in these novel habitats, and (3) explore whether effluent-dependent streams can support diverse odonate assemblages. Methods We conducted monthly odonate surveys at three sites along the Santa Cruz River (Tucson, AZ, USA) between June 2019 and May 2020. One site was in a long-established effluent-dependent reach (flowing since the 1970s) that served as a reference site and two sites were in a newly-established reach that began flowing on June 24, 2019 (it was previously dry). We compared odonate species richness, assemblage composition, and colonization patterns across these reaches, and examined how these factors responded to flow cessation events in the new reach. Results Seven odonate species were observed at the study sites in the new reach within hours of flow initiation, and species rapidly continued to arrive thereafter. Within 3 months, species richness and assemblage composition of adult odonates were indistinguishable in the new and reference reaches. However, drying events resulted in short-term and chronic reductions in species richness at one of the sites. Across all three sites, we found over 50 odonate species, which represent nearly 40% of species known from the state of Arizona. Discussion Odonates were surprisingly diverse in the effluent-dependent Santa Cruz River and rapidly colonized a newly established reach. Richness levels remained high at study sites that did not experience drying events. These results suggest that consistent discharge of high-quality effluent into dry streambeds can be an important tool for promoting urban biodiversity. However, it remains to be seen how quickly and effectively less vagile taxa (e.g., mayflies, caddisflies) can colonize novel reaches. Effluent-dependent urban streams will always be highly managed systems, but collaboration between ecologists and urban planners could help to maximize aquatic biodiversity while still achieving goals of public safety and urban development.

Comparative analysis of macrofaunal species richness and composition in Posidonia oceanica, Cymodocea nodosa and leaf litter beds

2008 ◽  
Vol 153 (6) ◽  
pp. 1087-1101 ◽  
Author(s):  
S. Como ◽  
P. Magni ◽  
M. Baroli ◽  
D. Casu ◽  
G. De Falco ◽  
...  
Keyword(s):  
Species Richness ◽  
Comparative Analysis ◽  
Leaf Litter ◽  
Posidonia Oceanica ◽  
Cymodocea Nodosa ◽  
Macrofaunal Species

scholarly journals Comparative analysis of grassland habitats of Ukraine in terms of richness and diversity

2021 ◽  
pp. 191-196
Author(s):  
A. A. Kuzemko
Keyword(s):  
Species Richness ◽  
Comparative Analysis ◽  
Carbonate Rocks ◽  
Diversity Indices ◽  
Hay Meadows ◽  
Mountain Habitats ◽  
Wet Grasslands ◽  
Evenness Indices ◽  
Almost All ◽  
Grassland Habitats

Using the big dataset (17,687 vegetation plots), a comparative analysis of grassland habitats of Ukraine in terms of species richness, Shannon and Simpson diversity indices and Pielou and Smith-Wilson evenness indices was performed. Leading positions of thermophilous forest fringe and hay meadows, especially mountain ones, in almost all indices were revealed. Instead, halophytic habitats show the lowest rates in the vast majority of analyzes. In addition to these general patterns, the analysis revealed the following trends: in almost all analyzes (except for the values of the Smith- Wilson index) habitats formed on carbonate rocks had greater richness and diversity than those formed on rocks of silicates; in almost all cases (except the Pielou index) oligotrophic wet grasslands were characterized by higher values of richness and diversity than eutrophic ones; in all analyzes, mountain habitats were characterized by higher values of richness and diversity than similar lowland habitats.

Comparative Analysis of the Species Richness of Life Forms of Vascular Plants in the Middle Volga

2019 ◽  
Vol 12 (4) ◽  
pp. 310-320 ◽  
Author(s):  
P. A. Shary ◽  
L. S. Sharaya ◽  
A. V. Ivanova ◽  
N. V. Kostina ◽  
G. S. Rosenberg
Keyword(s):  
Species Richness ◽  
Comparative Analysis ◽  
Vascular Plants ◽  
Life Forms ◽  
Middle Volga

scholarly journals Comparative Analysis of Wheat Hay and Silage in Methane Production, Fermentation Characteristics and Microbiota Using In Vitro Rumen Cultures

2020 ◽  
Vol 10 (23) ◽  
pp. 8456
Author(s):  
Wenjing Niu ◽  
Haibo Wang ◽  
Yang He ◽  
Qinghua Qiu ◽  
Taoqi Shao ◽  
...  
Keyword(s):  
Species Richness ◽  
Comparative Analysis ◽  
Relative Abundance ◽  
Methane Production ◽  
High Throughput Sequencing ◽  
Neutral Detergent Fiber ◽  
Harvest Time ◽  
Fiber Degradation ◽  
Dough Stage

This study determined the effects of wheat stage, preservation treatment, and harvest time on the fermentation characteristics, methane production, and bacterial diversity. In this study, processing wheat into hay can reduce methane production. The MWS7 (wheat harvested at 7:00 in milk stage and preserved as silage) group had a significantly lower CO2 compared with the DWS15 (wheat harvested at 15:00 in dough stage and preserved as silage) group. Neutral detergent fiber degradation in the hay treatment harvesting at 7:00 was significantly higher than that in other treatments. The butyrate proportion in the DWH7 (wheat harvested at 7:00 in dough stage and preserved as hay) group was higher than that in the MWS7 group. Results from high-throughput sequencing showed that there were differences in the relative abundance of some minor rumen microbiota among the treatments. The MWS7 group had greater microbial diversity and the MWH7 group (wheat harvested at 7:00 in milk stage and preserved as hay) had higher species richness. In addition, the MWH7 group had a lower Methanobrevibacter abundance and methane production. Overall, the MWH7 group may have advantages of rumen fermentation and reduce methane production.

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