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73 results for “river macroinvertebrates”
Data from: Developing and applying a macroinvertebrate‐based multimetric index for urban rivers in the Niger Delta, Nigeria
<p class="MsoCommentText">Urban pollution of riverine ecosystem is a serious concern in the Niger Delta region of Nigeria. No biomonitoring tool exists for the routine monitoring of effects of urban pollution on riverine systems within the region. Therefore, the aim of this study was to develop and apply a macroinvertebrate-based multimetric index for assessing water quality condition of impacted urban river systems in the Niger Delta area of Nigeria. Macroinvertebrate and physico-chemical samples were collected from 11 stations in eight river systems. Based on the physico-chemical variables, the stations were categorised into three impact categories namely; least impacted stations (LIS), moderately impacted stations (MIS) and heavily impacted stations (HIS). Seventy seven (77) candidate metrics were tested and only five: Hemiptera abundance, %Coleoptera+Hemiptera, %Chironomidae+Oligochaeta, Evenness index and Logarithm of relative abundance of very large body size (>40-80 mm) were retained and integrated into the final Niger Delta urban multimetric index (MINDU). The validation data set showed a correspondence of 83.3% between the index result and the physico-chemically-based classification for the LIS and a 75% correspondence for the MIS. A performance of 22.2% was recorded for the HIS. The newly developed MINDU proved useful as a biomonitoring tool in the Niger Delta region of Nigeria, and can thus be used by environmental managers and government officials for routine monitoring of rivers and streams subjected to urban pollution.</p>
Abundance trends for river macroinvertebrates vary across taxa, trophic group and river typology
<p>There is mounting evidence that terrestrial arthropods are declining rapidly in many areas of the world. It is unclear whether freshwater invertebrates, which are key providers of ecosystem services, are also declining. We addressed this question by analysing a long-term dataset of macroinvertebrate abundance collected from 2002 to 2019 across 5,009 sampling sites in English rivers. Patterns varied markedly across taxonomic groups. Within trophic groups, we detected increases in the abundance of carnivores by 19% and herbivores by 14.8%, whilst we estimated decomposers have declined by 21.7% in abundance since 2002. We also found heterogeneity in trends across rivers belonging to different typologies based on geological dominance and catchment altitude, with organic lowland rivers having generally higher rates of increase in abundance across taxa and trophic groups, with siliceous lowland rivers having the most declines. Our results reveal a complex picture of change in freshwater macroinvertebrate abundance between taxonomic groups, trophic levels and river typologies. Our analysis helps with identifying priority regions for action on potential environmental stressors where we discover macroinvertebrate abundance declines.</p>
Fig. 3 in To Registrations Of Bottom Macroinvertebrates, Fish, Amphibians And Reptiles Of The Upper Tskhenistskali River Basin (Georgia, Lower Svanetia)
Fig. 3. Caught specimens of the brown trout (S. trutta).
Fig. 4 in To Registrations Of Bottom Macroinvertebrates, Fish, Amphibians And Reptiles Of The Upper Tskhenistskali River Basin (Georgia, Lower Svanetia)
Fig. 4. Caught specimens of the Colchic barbel (B. escerichia). Amphibia
Fig. 1 in To Registrations Of Bottom Macroinvertebrates, Fish, Amphibians And Reptiles Of The Upper Tskhenistskali River Basin (Georgia, Lower Svanetia)
Fig. 1. Study area and sampling station.
Figure 4 in New insight into the macroinvertebrates of the Rawka River Nature Reserve (central Poland)
Figure 4. Cumulative species estimation.
Figure 3 in New insight into the macroinvertebrates of the Rawka River Nature Reserve (central Poland)
Figure 3. Results of the hierarchical cluster analysis.
Figure 2 in New insight into the macroinvertebrates of the Rawka River Nature Reserve (central Poland)
Figure 2. Study sites: I Doleck, II Suliszew, III Ziemiary, IV Bolimowska Wieś.
Figure 1 in New insight into the macroinvertebrates of the Rawka River Nature Reserve (central Poland)
Figure 1. Map of the study area.
Macroinvertebrate diversity, community structure, and dispersal in a regulated river are affected by tributary identity and confluence conditions
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Data from: Developing and applying a macroinvertebrate‐based multimetric index for urban rivers in the Niger Delta, Nigeria
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Data from: As time goes by: 20 years of changes in the aquatic macroinvertebrate metacommunity of Mediterranean river networks
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Abundance trends for river macroinvertebrates vary across taxa, trophic group and river typology
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Data from: Macroinvertebrate community responses to disturbance in a fragmented river with contrasting legacies of alteration
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Data from: Environmental filtering of macroinvertebrate traits influences ecosystem functioning in a large river floodplain
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Dataset_Biodiversity_River_Po_Macroinvertebrates_2020
<p>The data set consists of 41 columns per 130,727 records. The first column reports the ID Code of each record. The successive six columns are a rank-based taxonomical classification including the categories of Kingdom, Phylum, Class, Subclass, Order, Family, when known and available. Then, one column reports the taxon name and one column the unique identifier for the occurrence of Global Biodiversity Information Facility database (GBIF, 2020). The following eight columns refer to: Frequency (expressed as absolute abundance and referred to the sampled area), Sampled Area, Sample code, Site code, Sampling date (as dd/mm/yyyy) and Sampled mesohabitat (Riffle, Pool or Generic). The next seventeen columns report the sampled microhabitat expressed as percentage, classified in nine mineral substrate classes and eight biological substrates as included in the national standardised method (ISPRA, 2014). The remaining seven columns refer to: Human impacts in the site (present or absent), Administrative Region, River Name, geodetic Datum, Longitude East and Latitude North and Altitude (as m a.s.l.).</p>
Data from: Comparison of the abiotic preferences of macroinvertebrates in tropical river basins
We assessed and compared abiotic preferences of aquatic macroinvertebrates in three river basins located in Ecuador, Ethiopia and Vietnam. Upon using logistic regression models we analyzed the relationship between the probability of occurrence of five macroinvertebrate families, ranging from pollution tolerant to pollution sensitive, (Chironomidae, Baetidae, Hydroptilidae, Libellulidae and Leptophlebiidae) and physical-chemical water quality conditions. Within the investigated physical-chemical ranges, nine out of twenty-five interaction effects were significant. Our analyses suggested river basin dependent associations between the macroinvertebrate families and the corresponding physical-chemical conditions. It was found that pollution tolerant families showed no clear abiotic preference and occurred at most sampling locations, i.e. Chironomidae were present in 91%, 84% and 93% of the samples taken in Ecuador, Ethiopia and Vietnam. Pollution sensitive families were strongly associated with dissolved oxygen and stream velocity, e.g. Leptophlebiidae were only present in 48%, 2% and 18% of the samples in Ecuador, Ethiopia and Vietnam. Despite some limitations in the study design, we concluded that associations between macroinvertebrates and abiotic conditions can be river basin-specific and hence are not automatically transferable across river basins in the tropics.
List of benthic macroinvertebrate taxa from the upper Paraná River floodplain: summarizing information from a literature search
<p>We created a checklist of benthic macroinvertebrates taxa found in the environments of the upper Parana River floodplain according to the information found in published articles. The checklist data presents the taxa list, the substrate type, the environment type, and the year that each taxon was initially recorded for the region. We searched for data on aquatic macroinvertebrates recorded in the upper Paraná River floodplain by reviewing published articles and reports (grey literature). We took data from an extensive literature search at the ISI Web of Knowledge, SciELO, and Scopus websites, using the keyword combination “upper Paraná River” or “Paraná River” and “floodplain” or “wetland” and “macroinvertebrate*” for the search. We selected articles published between 1990 and 2020. We selected the articles following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) model (Liberati et al., 2009) and considered the selection in four steps: (1) the country of the study, (2) the title, (3) the abstract, and (4) the full text. The selection of papers followed some eligible parameters such as type of organisms, study area, and the presence of taxa data. During the selection, we excluded macroinvertebrates recorded as parasites or those found in studies of vertebrate feeding habits. Articles that contained these two criteria were excluded from the analyses. The articles that remained were analysed regarding the type of substrate where the macroinvertebrates were recorded (i.e., sediment, macrophytes, or artificial substrates), type of environment where each taxon was found (i.e., lentic or lotic environment), and the year in which each taxon was recorded for the first time in the upper Paraná River floodplain.</p>
On the study of fauna (macroinvertebrates, fish, amphibians, reptiles, birds and mammals) of the lower course of Shokhdara river valley in Pamir, Mountain Bodakhshan, Tajikistan.Appendices. Lists of terrestrial vertebrates recorded in the field survey at the Shokhdara and Panj Rivers
<p><strong><span>Appendix</span><span> 1. A list of records of batracho- and herpetofauna in the field survey.<br><span>Appendix 2.</span> List of avifauna of the surveyed region.<br><span>Appendix 3<span> A</span><span> list of mammals recorded in the field survey.</span></span></span></strong></p>
Figure 2 in Macroinvertebrate and vertebrate fauna of temporary pools, Hudson River Valley, New York, USA
Figure 2. Ternary diagram of the major cation composition of pool water expressed as the percentage of the total cations (in milliequivalents per litre). Calcium is the dominant cation type for most of the pools, reflecting local geology. Sodium is the dominant cation in Pools 15 and 20, both bordering public roads.
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International Brain Laboratory public data
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OpenNeuro
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