Trophic-based diversification in benthivorous charrs (Salvelinus) dwelling littoral zones of Northern lakes

Hydrobiologia ◽  
2021 ◽  
Author(s):  
Grigorii N. Markevich ◽  
Evgeny V. Esin ◽  
Dmitry A. Medvedev ◽  
Olesya Yu. Busarova ◽  
Aleksei V. Tiunov
Keyword(s):  
Littoral Zones ◽  
Charrs Salvelinus

Littoral zones as sources of biodegradable dissolved organic carbon in lakes

2008 ◽  
Vol 65 (11) ◽  
pp. 2454-2460 ◽  
Author(s):  
E. G. Stets ◽  
J. B. Cotner
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Aquatic Macrophytes ◽  
Trophic Status ◽  
Surface Sediments ◽  
Decay Curve ◽  
Lake Area ◽  
Lake Trophic Status ◽  
Littoral Zones ◽  
Biodegradable Dissolved Organic Carbon

A survey of 12 lakes in Minnesota, USA, was conducted to examine the factors controlling variability in biodegradable dissolved organic carbon (BDOC) concentration. The principal question addressed was whether BDOC concentration was more strongly related to lake trophic status or morphometric parameters. BDOC concentration was determined by incubating filtered lake water for a period of 15 months and fitting an exponential decay curve to measured DOC concentrations. BDOC concentrations varied from 73 to 427 µmol C·L–1 and composed 15%–63% of the total DOC pool. There were no significant correlations between BDOC and measures of lake trophic status. Instead, BDOC was most closely associated with the percentage of lake area covered by littoral zone, suggesting a significant source of BDOC from aquatic macrophytes and lake surface sediments.

scholarly journals Wave-induced release of methane: Littoral zones as source of methane in lakes

2010 ◽  
Vol 55 (5) ◽  
pp. 1990-2000 ◽  
Author(s):  
Hilmar Hofmann ◽  
Luisa Federwisch ◽  
Frank Peeters
Keyword(s):  
Littoral Zones ◽  
Wave Induced

scholarly journals Exploring Microbial Resource of Different Rhizocompartments of Dominant Plants Along the Salinity Gradient Around the Hypersaline Lake Ejinur

2021 ◽  
Vol 12 ◽  
Author(s):  
Junqing Luo ◽  
Zhechao Zhang ◽  
Yazhou Hou ◽  
Fengwei Diao ◽  
Baihui Hao ◽  
...  
Keyword(s):  
High Throughput Sequencing ◽  
Salt Lake ◽  
Salinity Gradient ◽  
Salt Lakes ◽  
Hypersaline Environment ◽  
Hypersaline Lake ◽  
Littoral Zones ◽  
Microbial Resources ◽  
Bacteria And Fungi

Lake littoral zones can also be regarded as another extremely hypersaline environment due to hypersaline properties of salt lakes. In this study, high-throughput sequencing technique was used to analyze bacteria and fungi from different rhizocompartments (rhizosphere and endosphere) of four dominant plants along the salinity gradient in the littoral zones of Ejinur Salt Lake. The study found that microbial α-diversity did not increase with the decrease of salinity, indicating that salinity was not the main factor on the effect of microbial diversity. Distance-based redundancy analysis and regression analysis were used to further reveal the relationship between microorganisms from different rhizocompartments and plant species and soil physicochemical properties. Bacteria and fungi in the rhizosphere and endosphere were the most significantly affected by SO42–, SOC, HCO3–, and SOC, respectively. Correlation network analysis revealed the potential role of microorganisms in different root compartments on the regulation of salt stress through synergistic and antagonistic interactions. LEfSe analysis further indicated that dominant microbial taxa in different rhizocompartments had a positive response to plants, such as Marinobacter, Palleronia, Arthrobacter, and Penicillium. This study was of great significance and practical value for understanding salt environments around salt lakes to excavate the potential microbial resources.

Phylogeny of Echiura updated, with a revised taxonomy to reflect their placement in Annelida as sister group to Capitellidae

2020 ◽  
Vol 34 (1) ◽  
pp. 101 ◽  
Author(s):  
Ryutaro Goto ◽  
James Monnington ◽  
Marija Sciberras ◽  
Isao Hirabayashi ◽  
Greg W. Rouse
Keyword(s):  
Molecular Phylogeny ◽  
Deep Sea ◽  
Sister Group ◽  
Molecular Data ◽  
Monterey Bay ◽  
Phylogenetic Studies ◽  
Littoral Zones ◽  
Family Level ◽  
Relationship Of ◽  
The Relationship

Echiura (commonly called spoon worms) are derived annelids that have an unsegmented sausage-shaped body with a highly extensible anterior end (i.e. a proboscis). Echiura currently contains two superfamilies: Echiurioidea (with Echiuridae, Urechidae and Thalassematidae) and Bonellioidea (with Bonelliidae, and Ikedidae). Ikedidae contains only Ikeda, which is distinctive in having a huge trunk, a highly elongate proboscis with stripes or dots, and numerous gonoducts. A recent molecular phylogeny of Echiura recovered Ikedidae as the sister group to Bonelliidae. However, due to relatively low support values for the monophyly of Bonelliidae, this relationship remains problematic. In this study, we reinvestigated the relationship of Bonelliidae and Ikedidae using an expanded dataset with more taxa and genes. In contrast to the previous results, our analyses strongly support that Ikeda is nested within Bonelliidae due to the placement of Maxmuelleria. On the basis of this result, we synonymise Ikedidae with Bonelliidae and transfer Ikeda to the latter, the diagnosis of which is amended. In addition, we synonymise Urechidae with its sister group Echiuridae because they share the synapomorphy of having anal chaetae rings. Furthermore, considering that recent phylogenetic studies have consistently recovered Echiura as the sister group to Capitelliidae within Annelida, we drop the rank of the echiuran clade to family-level and propose a revised classification: Thalassematidae with two subfamilies, Thalassematinae (with two tribes Echiurini and Thalassematini) and Bonelliinae. In addition, we identified a sample collected from the deep sea (~1820 m) of Monterey Bay, California, based on its molecular data. This terminal unexpectedly formed the sister group to the eight genera of Thalassematini, most members of which are inhabitants of littoral zones.

Seasonal variations in the water quality, diversity and population ecology of intertidal macrofauna at an industrially influenced coast

2010 ◽  
Vol 61 (6) ◽  
pp. 1505-1514 ◽  
Author(s):  
A. Vaghela ◽  
P. Bhadja ◽  
J. Ramoliya ◽  
N. Patel ◽  
R. Kundu
Keyword(s):  
Water Quality ◽  
Seasonal Variations ◽  
Anthropogenic Activities ◽  
Habitat Destruction ◽  
Anthropogenic Pressure ◽  
The North ◽  
Physico Chemical ◽  
Littoral Zones ◽  
Reported Data ◽  
Physical And Chemical

Present communication reports the physico-chemical and biological quality of seawater and status of benthos of a highly industrialized shore of the north-western coastline of India. The coastal area considered for the present study, encircled by a variety of industries, was divided into two sampling sites and monitored for two consecutive years. Results of the water quality suggest that the obtained values of the physical and chemical parameters of seawater were comparable with data reported earlier. However, data obtained in the biological parameters of the seawater showed a declining trend. Results of the intertidal macrofaunal diversity studies revealed that the muddy upper littoral zones were represented by few species of coelenterata, porifera, arthropoda and mollusca. In the rocky—muddy middle littoral zones, gastropods, stars fishes, corallites, crabs, polychetes and tubeworms were present, whereas, predominantly rocky lower littoral zones were comparatively rich in macrofaunal diversity with small patches of coral colonies. However, when the results obtained in the present study was compared with that of earlier reported data, it was clear that the macrofaunal diversity indeed declined considerably over the years. This may be due to habitat destruction and habitat alteration in the coastline caused by increased anthropogenic activities in the area. Seasonal variations in the population density and abundance were observed in most of the faunal groups except in sessile corals and sponges. This may be due to local migration of the faunal groups towards deeper regions of the Gulf, as supported by the analysis of similarity, to avoid influx of freshwater during monsoon, and high temperature during summer and post monsoon seasons. The overall assessment of different parameters of this study revealed that though the physico- chemical characteristics of the seawater did not varied much from the earlier reported status, the biological characteristics of the seawater and intertidal zone was affected possibly by a high degree of anthropogenic pressure.

Human shoreline development and the nutrient stoichiometry of aquatic plant communities in Canadian Shield lakes

2012 ◽  
Vol 69 (10) ◽  
pp. 1642-1650 ◽  
Author(s):  
Paul C. Frost ◽  
Andrea L. Hicks
Keyword(s):  
Elemental Composition ◽  
Plant Communities ◽  
Aquatic Plant ◽  
Taxonomic Composition ◽  
Individual Plant ◽  
Nutrient Stoichiometry ◽  
Shoreline Development ◽  
Ecological Processes ◽  
South Central ◽  
Littoral Zones

Human activities associated with residential development potentially alter ecological processes in lake littoral zones. We determined how the nutrient stoichiometry of aquatic plant communities relates to residential density around lakes of south-central Ontario. We calculated the elemental composition of entire plant communities from multiple sites in 12 lakes using measurements of individual plant C:N:P ratios and their areal biomass. We found considerable variability in the C:N:P ratios of whole aquatic plant communities among sites and lakes, which was not accounted for by intraspecific variability in the elemental composition of aquatic plants. Instead, differences in community-level C:N:P ratios primarily resulted from high interspecific variability in the elemental composition among dominant plant taxa and variable taxonomic composition of sampled plant communities. Plant community composition differed among lakes with and without shoreline residences, and we found lower C:N and C:P ratios in communities from littoral zones in human-developed lakes. Our results thus demonstrate a link between the elemental and taxonomic composition of aquatic plant communities, which may mediate biogeochemical responses of littoral zones to development of lake shorelines.

Limited effects of stocked trout on littoral invertebrates in boreal foothills lakes

2012 ◽  
Vol 69 (1) ◽  
pp. 178-190 ◽  
Author(s):  
Leslie E. Nasmith ◽  
William M. Tonn ◽  
Cynthia A. Paszkowski ◽  
Garry J. Scrimgeour
Keyword(s):  
Community Composition ◽  
Size Structure ◽  
Invertebrate Community ◽  
Negative Effects ◽  
High Productivity ◽  
Recreational Angling ◽  
Key Characteristics ◽  
Littoral Zones ◽  
Littoral Invertebrates ◽  
The Impact

Stocking lakes with trout for the purposes of recreational angling is a management strategy that introduces a new predator into these systems and thus deserves careful scrutiny. To assess the impact of non-native trout on littoral invertebrates in naturally fish-bearing lakes in the boreal foothills of Alberta, Canada, we compared their community composition, abundance, and size structure in stocked (n = 5) and unstocked (n = 6) lakes over a 2-year period. We detected no clear negative effects of introduced trout on invertebrate community composition and only few taxa-specific examples of decreased or increased invertebrate abundance. Furthermore, predation by trout had inconsistent direct effects on the size structure of invertebrate populations. Indirect effects were suggested by increased abundances and sizes of some invertebrate taxa in stocked lakes and might also contribute to the limited overall differences that we observed. We propose that net effects of stocked trout on littoral invertebrates are influenced by key characteristics of receiving ecosystems. In our boreal foothills lakes, dense macrophyte cover in warm littoral zones, high productivity, abundant forage fish, and limited densities of trout all likely combine to allow littoral invertebrate communities to withstand the impact of introduced trout with minimal effects.

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