Search results for "OOBE"
showing 10 items of 28 documents
The chronic effects of fullereneC 60 -associated sediments in the midge Chironomus riparius – Responses in the first and the second generation
2017
Abstract The life cycle parameters of the benthic invertebrate Chironomus riparius make it a relevant organism for use in multi-generation chronic ecotoxicology tests. Since studies on chronic exposures with fullerene carbon nanoparticles have revealed adverse effects at lower concentration ranges, it is crucial to gain understanding of the consequences in following generations. The aims of this study were to investigate whether sediment-associated fullereneC 60 impacts on C. riparius emergence and breeding, thus affecting the growth of the second generation. Larvae were exposed to fullerene-spiked sediment at concentrations of 0.5, 10 and 40 mg/kg sediment dw. Total emergence and breeding …
Do the ecological drivers of lake littoral communities match and lead to congruence between organism groups?
2020
AbstractLake littoral environments are heterogeneous, and different organisms typically show specific responses to this environmental variation. We examined local environmental and spatial factors affecting lake littoral biodiversity and the structuring of assemblages of phytoplankton, zooplankton and macroinvertebrates within and among three basins of a large lake system. We explored congruence of species composition and species richness among the studied organism groups to evaluate their general indicator potential to represent spatial variation in other groups. We expected that effects of water chemistry on plankton assemblages were stronger than effects of habitat characteristics. In co…
Vertical sediment migrations of dominant midge species in subtropical lakes with implications for bioassessment
2018
Abstract Propsilocerus akamusi (Diptera: Chironomidae) is a dominant species in numerous eutrophic lakes and they could burrow into deep sediments (>30 cm) during summer months. However, common-used grab samplers are efficient in collecting surface-dwelling species (
Spatial variability of macrozoobenthic community and trophic structure of a subtropical lagoon on southeastern Brazil's Atlantic coast
2013
The objective of this study was to investigate the macrobenthic community of two compartments of the Maricá-Guarapina lagoon system, along the coast of Rio de Janeiro, Brazil, in relation to its abiotic sediment factors. An additional discrimination between sites was made, wherever the macrophyte Typha domingensis was found. This vegetation supposedly represents a potentially important food source for consumers. Furthermore, the trophic pathways were analyzed functionally by means of stable isotope analysis to assess the role of organic matter sources for consumers in the study area. In conclusion, the results showed differences between abiotic features in the compartments of the lagoon sys…
Latvijas ūdeņu vides pētījumi un aizsardzība: rakstu krājums (Rīga, 2017. gada 2. februāris)
2017
Characterization of Intertidal Macrofaunal Communities of Two Sandy Beaches under Different Anthropogenic Pressures
2022
The macrofauna in the intertidal zone of sandy beaches provides the trophic connectivity between land and sea, by linking microbiome, meiofauna, and megafauna, representing a food source for several terrestrial animals, including shorebirds and mammals. However, the macrozoobenthos in urbanised beaches is subjected to intense disturbances, such as breakwater barriers and tourism, which limit or impede the energy transfer from the marine to the terrestrial habitats. Because the information about diversity and abundance of the macrozoobenthos of the intertidal zone on the Mediterranean sandy coasts is scant, the main objective of this study is to increase the knowledge on the macrofauna livin…
Latvijas ūdeņu vides pētījumi un aizsardzība: referātu tēžu krājums (Rīga, 2015. gada 4. februāris)
2015
Litorāles mikrobiotopu ietekme uz Pierīgas brūnūdens ezeru makrozoobentosa sabiedrībām
2019
Maģistra darba “Litorāles mikrobiotopu ietekme uz Pierīgas brūnūdens ezeru makrozoobentosa sabiedrībām” izstrāde un materiālu ievākšana notika (no 17.07.17. līdz 25.05.18.) četros Garkalnes novada ezeros – Līņezerā, Piekūnītī, Maku ezerā un Lielajā Jūgezerā. Analizējot iegūtos rezultātus var secināt, ka zoobentosa organismi visvairāk piesaistīti mikrobiotopiem ar ūdensaugiem un dūņainu grunti. Pārējos mikrobiotopos zoobentosa indivīdu un sugu skaits ir ievērojami mazāks apstiprinot izvirzīto hipotēzi. Ezeru paraugos tika konstatēti 14 dažādi makrozoobentosa taksoni. Visbiežāk pārstāvētās kārtas - vaboles un blaktis. Visi pētāmie ezeri pieskaitāmi brūnūdens ezeru tipam, augu sugu, grunts vei…