Profundal zone
View article: Climate and productivity shape fish and invertebrate community structure in subarctic lakes
Climate and productivity shape fish and invertebrate community structure in subarctic lakes Open
Summary Climate change and land‐use intensification are increasing productivity in subarctic lakes. Simultaneously, fish and invertebrate species adapted to temperate conditions are expanding their range northwards into subarctic habitats.…
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Morphological divergence between three Arctic charr morphs – the significance of the deep‐water environment Open
Morphological divergence was evident among three sympatric morphs of Arctic charr ( Salvelinus alpinus (L.)) that are ecologically diverged along the shallow‐, deep‐water resource axis in a subarctic postglacial lake (Norway). The two deep…
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The benthic community of the Laurentian Great Lakes: Analysis of spatial gradients and temporal trends from 1998 to 2014 Open
We used the results of seventeen years of Great Lakes benthic monitoring conducted by the U.S. EPA's Great Lakes National Program Office to describe the spatial and temporal patterns of benthic communities, assess their status, trends, and…
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Ecological opportunity shapes a large Arctic charr species radiation Open
Ecological opportunity is considered a crucial factor for adaptive radiation. Here, we combine genetic, morphological and ecological data to assess species and ecomorphological diversity of Artic charr in six lakes of a catchment in southe…
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Spatial distribution of environmental indicators in surface sediments of Lake Bolshoe Toko, Yakutia, Russia Open
Rapidly changing climate in the Northern Hemisphere and associated socio-economic impacts require reliable understanding of lake systems as important freshwater resources and sensitive sentinels of environmental change. To better understan…
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Morphological, ecological and behavioural differentiation of sympatric profundal and pelagic Arctic charr (Salvelinus alpinus) in Loch Dughaill Scotland Open
Phenotypic variation in populations of fishes that inhabit postglacial lakes is often associated with trophic specialisations. A common sympatric foraging divergence seen in Arctic charr is into either plankton or littoral-zoobenthos feedi…
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Seven Millennia of human impact as reflected in a high resolution pollen profile from the profundal sediments of Litzelsee, Lake Constance region, Germany Open
A profundal core from Litzelsee, a small cirque lake in the western Lake Constance region, was investigated by pollen analysis and dated radiometrically. The upper part of the core, chronologically between 5000 cal bc and 1850 ad, was samp…
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Organic carbon mass accumulation rate regulates the flux of reduced substances from the sediments of deep lakes Open
The flux of reduced substances, such as methane and ammonium, from the sediment to the bottom water (Fred) is one of the major factors contributing to the consumption of oxygen in the hypolimnia of lakes and thus crucial for lake oxygen ma…
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“ <i>And</i> <i>if you gaze long into an abyss, the abyss gazes also into thee</i> ”: four morphs of Arctic charr adapting to a depth gradient in Lake Tinnsjøen Open
The origin of species is a central topic in biology. Ecological speciation might be a driver in adaptive radiation, providing a framework for understanding mechanisms, level, and rate of diversification. The Arctic charr Salvelinus alpinus…
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Effect of interannual variation in winter vertical mixing on CH<sub>4</sub> dynamics in a subtropical reservoir Open
Although freshwaters are considered to be substantial natural sources of atmospheric methane (CH 4 ), in situ processes of CH 4 production and consumption in freshwater ecosystems are poorly understood, especially in subtropical areas, lea…
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Food depletion regulates the demography of invasive dreissenid mussels in a stratified lake Open
Lake stratification produces sharp gradients in temperature and pelagic resources which have cascading effects on the traits of aquatic populations, including invasive species and their ecosystem impacts. We study the consequences of such …
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Allometric trajectories of body and head morphology in three sympatric Arctic charr (<i>Salvelinus alpinus</i> (L.)) morphs Open
A study of body and head development in three sympatric reproductively isolated Arctic charr ( Salvelinus alpinus (L.)) morphs from a subarctic lake (Skogsfjordvatn, northern Norway) revealed allometric trajectories that resulted in morpho…
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The trade‐off between fecundity and egg size in a polymorphic population of Arctic charr (<i>Salvelinus alpinus</i> (L.)) in Skogsfjordvatn, subarctic Norway Open
Reproductive traits differ between intralacustrine Arctic charr morphs. Here, we examine three sympatric lacustrine Arctic charr morphs with respect to fecundity, egg size and spawning time/site to assess reproductive investments and trade…
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The influence of restoration measures on phosphorus internal loading from the sediments of a hypereutrophic lake Open
Uzarzewskie Lake was a hypereutrophic, dimictic lake characterized by low water transparency, high chlorophyll-a concentration and intense phytoplankton blooms; thus, restoration treatment was started. A chemical treatment, based on phosph…
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Methane in Lakes: Variability in Stable Carbon Isotopic Composition and the Potential Importance of Groundwater Input Open
Methane (CH 4 ) is an important component of the carbon (C) cycling in lakes. CH 4 production enables carbon in sediments to be either reintroduced to the food web via CH 4 oxidation or emitted as a greenhouse gas making lakes one of the l…
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Resource Partitioning in Food, Space and Time between Arctic Charr (Salvelinus alpinus), Brown Trout (Salmo trutta) and European Whitefish (Coregonus lavaretus) at the Southern Edge of Their Continuous Coexistence Open
Arctic charr and European whitefish are considered to be strong competitors in lakes, with the latter usually being the superior species. However, high niche plasticity and lake morphometry may suggestively facilitate resource partitioning…
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Methane release from sediment seeps to the atmosphere is counteracted by highly active Methylococcaceae in the water column of deep oligotrophic Lake Constance Open
Methane emissions from freshwater environments contribute substantially to global warming but are under strong control of aerobic methane-oxidizing bacteria. Recently discovered methane seeps (pockmarks) in freshwater lake sediments have t…
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A laboratory microcosm for simultaneous gas and nutrient flux measurements in sediments Open
We developed a laboratory microcosm to study simultaneously the dynamics of gases and nutrients in sediments. With the microcosm, intact sediment cores were incubated under continuous water flow. The incubation system was constructed so th…
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High Inter‐ and Intra‐Lake Variation in Sediment Phosphorus Pools in Shallow Lakes Open
Phosphorus (P) release from lakebed sediments may fuel phytoplankton blooms, especially in shallow waterbodies. A primary mechanism that controls internal P loading is the size and chemical composition of the sediment P pool. However, vari…
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High‐frequency cycles of brachiopod shell beds on subaqueous delta‐scale clinoforms (early Pliocene, south‐east Spain) Open
During the early Pliocene, subaqueous delta‐scale clinoforms developed in the Águilas Basin, in a mixed temperate carbonate–siliciclastic system. The facies distribution is consistent with the infralittoral prograding wedge model. Stacking…
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How to Assess the Ecological Status of Highly Humic Lakes? Development of a New Method Based on Benthic Invertebrates Open
Highly humic lakes are typical for the boreal zone. These unique ecosystems are characterised as relatively undisturbed habitats with brown water, high acidity, low nutrient content and lack of macrophytes. Current lake assessment methods …
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Iron Reduction in Profundal Sediments of Ultraoligotrophic Lake Tahoe under Oxygen-Limited Conditions Open
Increased periods of bottom water anoxia in deep temperate lakes due to decreasing frequency and depth of water column mixing in a warming climate may result in the reductive dissolution of iron minerals and increased flux of nutrients fro…
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Ecological singularity of temperate mesopredatory myliobatoid rays (Chondrichthyes: Myliobatiformes) Open
Many myliobatoid rays are important mesopredators, having significant effects on coastal benthic communities. In tropical and subtropical high-diversity oligotrophic ecosystems, they partition their trophic resources, which results in high…
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A brain and a head for a different habitat: Size variation in four morphs of Arctic charr (<i>Salvelinus alpinus</i>(L.)) in a deep oligotrophic lake Open
Adaptive radiation is the diversification of species to different ecological niches and has repeatedly occurred in different salmonid fish of postglacial lakes. In Lake Tinnsjøen, one of the largest and deepest lakes in Norway, the salmoni…
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Coexisting invasive gobies reveal no evidence for temporal and trophic niche differentiation in the sublittoral habitat of Lake Erhai, China Open
Niche differentiation facilitates the coexistence of species within a community through avoidance of competition via mechanisms involving spatial, temporal and/or trophic dimensions. Where invasive species coexist in their non‐native range…
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Internal Loading of Phosphorus from Bottom Sediments of Two Meso-eutrophic Lakes Open
The aim of the study was to determine the seasonal and spatial variability of phosphorus release from bottom sediments of two lakes in Poland (Wielkopolska Region): Lusowskie Lake and Prawe Lake. The comparison of results from these two la…
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Multiparameter assessment of select metal distribution in lacustrine sediments Open
Purpose The main objective of the study was the determination of the Cd, Cr, Cu, Pb, and Zn distribution in Wigry Lake sediments, as well as the contamination and ecotoxicological risk assessment on the basis of a large data set. Materials…
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Phosphorus in lake sediments of Poland – Results of monitoring research Open
In 2010-2013, 528 samples of surface sediments were collected from the profundal zone of lakes to determine concentrations of phosphorus, Al, Ca, Fe, K, Mn, Na and S, as well as trace elements (As, Ba, Cd, Co, Cr, Cu, Mo, Ni, Pb, Sn, Sr, T…
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Sediment phosphorus composition controls hot spots and hot moments of internal loading in a temperate reservoir Open
Phosphorus (P) flux across the sediment–water interface in lakes and reservoirs responds to external perturbations within the context of sediment characteristics. Lentic ecosystems experience profound spatiotemporal heterogeneity in the me…
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Carbon and nutrients transfer from primary producers to lake sediments – A stoichiometric approach Open
We aimed to demonstrate different input of organic and inorganic carbon, nitrogen and phosphorus from three main groups of primary producers (phytoplankton, charophytes and vascular submerged macrophytes) to respective lake sediments. Stud…