Between-year variations in the development of crustacean zooplankton in the Norwegian subalpine lake, Øvre Heimdalsvatn

Larsson, Petter; Hansen, Heidi; Helland, Linda Kristin Bjørnstad

doi:10.1007/s10750-010-0159-1

Cited by 7 publications

(6 citation statements)

References 28 publications

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“…The low abundance of copepods in the summer and autumn diet of S. trutta in Øvre Heimdalsvatn in 2013 does not support a substantial change in copepod consumption from 1969–1972 (Lien, ). Since Cyclops scutifer , a common first intermediate host of D. ditremum , is the only zooplankton species that overwinters in an active phase in Øvre Heimdalsvatn (Larsson et al, ), copepods recorded in the winter diet of S. trutta (Lien, ) must have been this species. Densities of C. scutifer in the lake have varied little from 1969 to 1999 (Larsson et al, ) and the increase in infection from around 1970 until the present is therefore most likely a result of an increased number of final hosts (mergansers and black‐throated loon) foraging in the lake, giving more droppings of Diphyllobothrium eggs.…”

Section: Discussionmentioning

confidence: 99%

Plerocercoids of the cestode Diphyllobothrium ditremum in brown trout Salmo trutta: substantial increase in infection after establishment of European minnow Phoxinus phoxinus

Borgstrøm

Trømborg

Haugen

et al. 2017

Journal of Fish Biology

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This study focuses on plerocercoids of the cestode Diphyllobothrium ditremum in brown trout Salmo trutta from the subalpine lake Øvre Heimdalsvatn in south-central Norway. Salmo trutta was the only fish species in this lake until European minnow Phoxinus phoxinus was registered in 1969. The P. phoxinus population increased substantially in the following years. In contrast with the 1969-1972 period, when plerocercoids of D. ditremum were practically absent in S. trutta, there was a high prevalence and intensity of infection in the 2013 S. trutta samples. Because the life cycle of D. ditremum involves two larval stages, in copepods and salmonids and mature worms in piscivorous birds, such as mergansers and loons, a change in feeding ecology of S. trutta or changes in population densities of copepods, fish or birds might have influenced the infection pattern. No relationships between D. ditremum infection and muscle-tissue δ N signature or Hg concentration were found, indicating that infection is not a result of piscivory or cannibalism. Furthermore, consumption of copepods by S. trutta during summer and autumn was low. On the other hand, the number of piscivorous birds has increased, probably due to the presence of P. phoxinus as a new and numerous prey. An increased number of final D. ditremum hosts may have produced a higher output of cestode eggs, resulting in more infected copepods that in turn are consumed by S. trutta. Indirectly, P. phoxinus may therefore have caused the observed increased infection in S. trutta and thereby imposed further negative effects on S. trutta in high mountain areas.

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Section: Discussionmentioning

confidence: 99%

Plerocercoids of the cestode Diphyllobothrium ditremum in brown trout Salmo trutta: substantial increase in infection after establishment of European minnow Phoxinus phoxinus

Borgstrøm

Trømborg

Haugen

et al. 2017

Journal of Fish Biology

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“…The snow cover algorithm is evaluated for application in a global climate monitoring system for snow variables. The early warning of the start of snowmelt and the extent of snow cover have the potential to be useful tools in detecting the timing of major hydrological processes in remote areas, such as ice break and the spring flood (Kvambekk & Melvold, 2010), which again are crucial to the seasonal development of lake biological production and food chains (Larsson et al, 1978(Larsson et al, , 2010Borgstrøm et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

“…This applies to the several aspects of the lake ecosystem, including the supply of allochthonous plant material to the lake from the terrestrial environment (Larsson & Tangen, 1975;Brittain & Bjørnstad, 2010), zooplankton dynamics (Larsson et al, 2010) and the inflow of Chernobyl radionuclides from contaminated catchment snows Salbu et al, 1992). Snow depth, snowmelt progression and snow conditions also affect the timing of ice breakup in Øvre Heimdalsvatn (Kvambekk & Melvold, 2010), another structuring factor for the lake ecosystem (Larsson et al, 1978).…”

mentioning

confidence: 99%

The development of new algorithms for remote sensing of snow conditions based on data from the catchment of Øvre Heimdalsvatn and the vicinity

et al. 2010

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The catchment of Øvre Heimdalsvatn and the surrounding area was established as a site for snow remote sensing algorithm development, calibration and validation in 1997. Information on snow cover and snowmelt are important for understanding the timing and scale of many lake ecosystem processes. Field campaigns combined with data from airborne sensors and spaceborne high-resolution sensors have been used as reference data in experiments over many years. Several satellite sensors have been utilised in the development of new algorithms, including Terra MODIS and Envisat ASAR. The experiments have been motivated by operational prospects for snow hydrology, meteorology and climate monitoring by satellite-based remote sensing techniques. This has resulted in new time-series multi-sensor approaches for monitoring of snow cover area (SCA) and snow surface wetness (SSW). The idea was to analyse, on a daily basis, a time series of optical and radar satellite data in multi-sensor models. The SCA algorithm analyses each optical and synthetic aperture radar (SAR) image individually and combines them into a day product based on a set of confidence functions. The SSW algorithm combines information about the development of the snow surface temperature and the snow grain size (SGS) in a time-series analysis. The snow cover algorithm is being evaluated for application in a global climate monitoring system for snow variables. The successful development of these algorithms has led to operational applications of snow monitoring in Norway and Sweden, as well as enabling the prediction of the spring snowmelt flood and thus the initiation of many lake production processes.

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“…The species composition of the zooplankton has, however, not changed between 1969 and 1999, and any direct impact of the minnows on the zooplankton community could not be detected (Larsson et al, 2010). Variations in species' density were more likely to be caused by prey-predator relationships within the zooplankton, while growth rates were strongly affected by lake water temperatures during June (Larsson et al, 2010).…”

Section: Research Historymentioning

confidence: 98%

“…Variations in species' density were more likely to be caused by prey-predator relationships within the zooplankton, while growth rates were strongly affected by lake water temperatures during June (Larsson et al, 2010).…”

Section: Research Historymentioning

confidence: 99%

The Norwegian reference lake ecosystem, Øvre Heimdalsvatn

Brittain

Borgstrøm

2010

Hydrobiologia

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The subalpine lake, Øvre Heimdalsvatn and its catchment, situated in the mountains of southern Norway, has been the subject of extensive ecosystem studies over the last 50 years covering a wide range of disciplines. The lake is located at 1,088 m a.s.l., has an area of 0.78 km 2 , a maximum depth of 13 m, and a catchment area of 23.6 km 2 . It lies more or less on the limit of the birch forest, while the catchment extends up over 1,800 m a.s.l. and into the high alpine zone. The valley is little influenced by human activity and there is no permanent habitation, although the area is used for grazing of domestic livestock during summer. Otherwise the lake and its catchment have always been important for fish and game. The catchment also received major radionuclide fallout from the Chernobyl accident in 1986. The studies include Quaternary history, the development of algorithms for remote sensing of snow conditions, long-term changes in lake ice cover and temperature, the zooplankton and benthic communities, as well as the uptake of Chernobyl radionuclides and mercury by the biota. The consequences of the introduction of the European minnow (Phoxinus phoxinus) on the benthos, zooplankton and the brown trout (Salmo trutta) have also been investigated. The lake and its catchment are widely used in university teaching and thesis work. On account of the substantial knowledge base, Øvre Heimdalsvatn is well suited to long-term monitoring.

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Between-year variations in the development of crustacean zooplankton in the Norwegian subalpine lake, Øvre Heimdalsvatn

Cited by 7 publications

References 28 publications

Plerocercoids of the cestode Diphyllobothrium ditremum in brown trout Salmo trutta: substantial increase in infection after establishment of European minnow Phoxinus phoxinus

Plerocercoids of the cestode Diphyllobothrium ditremum in brown trout Salmo trutta: substantial increase in infection after establishment of European minnow Phoxinus phoxinus

The development of new algorithms for remote sensing of snow conditions based on data from the catchment of Øvre Heimdalsvatn and the vicinity

The Norwegian reference lake ecosystem, Øvre Heimdalsvatn

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