Benthic invertebrates were sampled at four stations along the Little Bear River continuum: Station 2 in the mountainous headwaters, at Station 4 in the transition area to the lowland valley, at ...Station 7 below Hyrum Reservoir, and at Station 11 in the low-gradient agricultural area near where the river flows into Cutler Reservoir wetland. At each station samples were collected with sweep nets in each of the habitats, with an effort made to sample each type of habitat in proportion to its abundance. Ethanol-preserved samples were counted utilizing 30X compound microscopes, with 2 or more students providing counts and taxa identifications for the invertebrates from each Station. The invertebrates identified from each station are shown in Table 1. A ratio of the combined counts of clean-water taxa (Ephemeioptera, Plecoptera and Tricoptera) and all other taxa was calculated for each station. This ratio can provide insight on water quality, but with the level of taxonomy used in the class exercise, should be interpreted cautiously. PUBLICATION ABSTRACT
We evaluated qualitatively and quantitatively the community structure of aquatic insects (Ephemeroptera, Plecoptera, and Trichoptera) in 19 streams in areas of Cerrado in the Paraguay, Parana, and ...Sao Francisco river basins. The number of genera and taxonomic composition were compared at spatial (at the hydrographie basins level) and conservation levels (more preserved and less preserved areas). The influence of spatial and environmental factors in richness and abundance was also evaluated. The geographical distribution of Grumicha, Cotyphoms, and Austrotinodes was expanded. The highest Trichoptera richness was found in the Sao Francisco river basin (F = 5,602, p = 0,004 ) and a higher number ofEphemeroptera genera occurred in the relatively less preserved sites (F = 6,835, p = 0,009). The pattern of genera distribution was different among basins (R = 0,0336, p = 0,001), but it was similar among relatively less and more preserved areas (R = -0,039, p = 0,737). These findings can be explained by the low impact level in these streams and also by the taxonomic resolution used in this study. Latitude and instream diversity were the most important factors to explain the variation in genera richness and abundance (p = 0.004 and p = 0.026, respectively). Hence, the regional differences can be attributed to spatial influences, quantity or quality of habitats and the original distribution of taxa within each basin.
The study represents the data on metal content in the body of stoneflies
Perla pallida
Guerin-Meneville, 1838 (Plecoptera, Perlidae) and in muscles of the fish family Cyprinidae from the small ...tributaries of the Belaya River (Republic of Adygea, Northwest Caucasus) with ore mineralization of various metals including mercury. It was found that mercury (Hg) concentrations in stoneflies are corresponds to from the water basins without local Hg sources. Mercury content in stoneflies depends on season and is more intensive in early ontogenesis in winter than in the warm season. Mercury concentration in 0.01–0.72 mg/kg dry weight can cause the pathomorphological changes in the structure of organs and decrease the adaptive potential in competitive population of stoneflies, in general. The Hg concentration reached 0.09–0.69 mg/kg in the studied fish species (bleak, gudgeons, and barbels) and was similar to concentrations in stonefly larvae. This can be related with low size-weight parameters of fishes in samples as wells as with similar feeding patterns of hydrobionts.
Capnia lacustra Jewett 1965, a wingless stonefly found in the deep benthic environment of Lake Tahoe, has declined in density and distribution since the 1960s. We investigated its life-history ...characteristics, including its pattern of voltinism. We also compared C. lacustra’s current density and distribution in plant beds to that in the 1960s. Size-frequency analysis showed the development of 2 asynchronous reproductive cohorts, each with a life-cycle duration of ̃1 y. The presence of eggs within mature females in May and November confirmed that spring and autumn cohorts develop simultaneously. We found eggs throughout the abdomen, thorax, and head of C. lacustra females. Females from the autumn cohort were viviparous, whereas the spring cohort was oviparous. This is the first time facultative viviparity has been described for Plecoptera. Capnia lacustra’s unique life history probably is driven by relatively stable temperatures and food availability in Chara beds in the lake. Capnia lacustra currently is known to occur only in 3 areas of Lake Tahoe, whereas it was widespread in the 1960s. It has maintained high densities at 1 of the sites, Camp Richardson, which has an extensive and dense bed of the macroalga Chara. Capnia lacustra’s dependence on Chara, which is declining in geographic and depth distribution in the lake, may have led to the observed declines in density and distribution of this remarkable stonefly.
Large-scale diversity patterns in relationship to environmental factors at multiple spatial scales have been well-studied for many taxonomic groups; however, freshwater ecosystems remain ...understudied. Biodiversity is now widely recognized to encompass many more factors than just species numbers, particularly the inclusion of functional attributes. In this study, we examined richness patterns of stream invertebrate genera and their biological traits (“functional” richness) across 364 sites in the contiguous USA. In particular, we focused on the relationship between taxonomy- and trait-based richness to test for functional redundancy in stream communities. Further, we obtained environmental data to model the relative importance of local and watershed-scale environmental factors and residual spatial (latitude, longitude) influences on taxonomy- and trait-based richness. Trait richness increased linearly with genus richness (slope ≪ 1), although this appears to be an artifact of the restricted range of genus richness in our study (32 genera maximum). Furthermore, trait richness was significantly lower than expected under random community assembly. In contrast, the Ephemeroptera, Plecoptera, and Trichoptera (EPT) genera exhibited a saturating pattern between trait and genus richness and trait richness was no different from random. Our study indicates that there is functional redundancy among stream invertebrate genera, likely as a result of harsh habitat filters limiting trait diversity. Environmental factors (including spatially structured environmental factors) were always more important than spatial factors (latitude, longitude) in structuring richness despite strong longitudinal patterns of all richness measures (these differences were only significant for EPT genera). Finally, we found no significant difference in the relative importance of local and watershed scale environmental factors for taxonomy- and trait-based richness.
The use of DNA barcoding allows unprecedented advances in biodiversity assessments and monitoring schemes of freshwater ecosystems; nevertheless, it requires the construction of comprehensive ...reference collections of DNA sequences that represent the existing biodiversity. Plecoptera are considered particularly good ecological indicators and one of the most endangered groups of insects, but very limited information on their DNA barcodes is available in public databases. Currently, less than 50% of the Iberian species are represented in BOLD.
The InBIO Barcoding Initiative Database: contribution to the knowledge on DNA barcodes of Iberian Plecoptera dataset contains records of 71 specimens of Plecoptera. All specimens have been morphologically identified to species level and belong to 29 species in total. This dataset contributes to the knowledge on the DNA barcodes and distribution of Plecoptera from the Iberian Peninsula and it is one of the IBI database public releases that makes available genetic and distribution data for a series of taxa.The species represented in this dataset correspond to an addition to public databases of 17 species and 21 BINs. Fifty-eight specimens were collected in Portugal and 18 in Spain during the period of 2004 to 2018. All specimens are deposited in the IBI collection at CIBIO, Research Center in Biodiversity and Genetic Resources and their DNA barcodes are publicly available in the Barcode of Life Data System (BOLD) online database. The distribution dataset can be freely accessed through the Global Biodiversity Information Facility (GBIF).
Taxonomic composition of zoobenthos, density, biomass, species diversity, and composition of the dominant complex of southern tundra water bodies in the lower reaches of the Indigirka River are ...discussed in the article. In this research, we considered 51 reservoirs: 8 lakes, 2 grass-Hypnum bogs, and 41 small tundra reservoirs. The composition of zoobenthos includes 17 invertebrate taxa of 3 types and 7 classes. The types of Mollusca and Arthropoda represent the majority regards zoobenthos diversity. Communities of Amphipoda, Mollusca, Arachnida, Trichoptera, Plecoptera, Diptera arevdominated by density and biomass. The community of Lake Dukarskoe had the highest value of Shannon index. Macrozoobenthos of the studied reservoirs has high faunistic similarity due to the periodic exchange of species. This mechanism contributes to the mutual enrichment of benthic waters in reservoirs and the maintenance of their diversity in the subarctic tundra.
Recent changes in Brazilian legislation reduced the width of riparian forest buffer needed to be preserved in private properties from 30 to 15 m or less. The consequences of these modifications can ...be dramatic, mainly because riparian buffer width is an important parameter for riparian forest structure and functioning. Our study assessed whether (1) macroinvertebrate family richness and Ephemeroptera, Plecoptera, and Trichoptera (EPT) family richness decrease with reduced riparian buffer width; (2) taxonomic composition and functional feeding group (FFG) composition of macroinvertebrates vary with a reduced riparian buffer width; and (3) reduced riparian buffer width similarly influence the macroinvertebrate community in different stream substrates. We selected three fragments with different riparian buffer widths (>40, <30, and <15 m) in three streams (fourth and fifth orders) in the Sinos River watershed, southern Brazil. Our results show that on all substrate types, reducing the width of the riparian buffer altered neither the macroinvertebrate richness nor EPT richness. However, EPT richness was greater in the substrates stone and gravel than leaf litter, independent of riparian buffer width. There was a significant difference in macroinvertebrate composition among riparian buffer widths. The macroinvertebrate composition and FFG differed among substrates, independent of riparian buffer width. This study showed that riparian buffer widths <15 m altered the macroinvertebrate community. A width greater than 15 m is necessary to maintain the composition and trophic conditions of macroinvertebrate families similar to those found in reference states of conservation.
Nymphs of three species of the genus Anacroneuria Klapálek, 1909, A. marlieri Froehlich, 2001; A. minuta Klapálek, 1922, and A. manauensis Ribeiro-Ferreira, 2001 are described. The associations of ...nymphs with adults were made by rearing. The known geographical distribution in Brazil of these three species was expanded.
The perlid genus Anacroneuria is the most widely distributed stonefly occurring in the Neotropics. Regional studies of this genus were made early in the last century, whereas local taxonomic and ...distributional studies have recently increased. In this study, we provide new Central American records for four species of Anacroneuria. Anacroneuria choco Stark & Bersosa 2006, A. costana (Navás 1924), A. hacha Stark 1998, and A. laru Gutiérrez-Fonseca 2015 are newly reported including new range extensions.
PDF
