Physiography of Lake Linnévatn, Western Spitsbergen

Bøyum, Anders; Kjensmo, Johannes

doi:10.1080/03680770.1977.11896573

Cited by 9 publications

(18 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…High genetic differentiation based on neutral markers has also been previously reported for six landlocked populations of Arctic charr across Fennoscandia (Shikano et al, ), and 12 landlocked populations in Maine (Bernatchez et al, ). Like Linne'vatn and Ellasjøen (Bøyum & Kjensmo, ; Klemetsen et al, ), these lakes are of postglacial origin (<12,000 years old) but it is uncertain if any have been geographically isolated for a similar length of evolutionary time as Ellasjøen (Bernatchez et al, ; Shikano et al, ). Our findings suggest that the allopatric morphs in Linne'vatn and Ellasjøen are locally adapted, and thus, responses to climate change will be variable between the lakes.…”

Section: Discussionmentioning

confidence: 99%

Characterizing neutral and adaptive genomic differentiation in a changing climate: The most northerly freshwater fish as a model

O’Malley

Vaux

Black

2019

Ecology and Evolution

View full text Add to dashboard Cite

Arctic freshwater ecosystems have been profoundly affected by climate change. Given that the Arctic charr ( Salvelinus alpinus ) is often the only fish species inhabiting these ecosystems, it represents a valuable model for studying the impacts of climate change on species life‐history diversity and adaptability. Using a genotyping‐by‐sequencing approach, we identified 5,976 neutral single nucleotide polymorphisms and found evidence for reduced gene flow between allopatric morphs from two high Arctic lakes, Linne'vatn ( Anadromous, Normal , and Dwarf ) and Ellasjøen ( Littoral and Pelagic ). Within each lake, the degree of genetic differentiation ranged from low ( Pelagic vs. Littoral ) to moderate ( Anadromous and Normal vs. Dwarf ). We identified 17 highly diagnostic, putatively adaptive SNPs that differentiated the allopatric morphs. Although we found no evidence for adaptive differences between morphs within Ellasjøen, we found evidence for moderate ( Anadromous vs. Normal ) to high genetic differentiation ( Anadromous and Normal vs. Dwarf ) among morphs within Linne'vatn based on two adaptive loci. As these freshwater ecosystems become more productive, the frequency of sympatric morphs in Ellasjøen will likely shift based on foraging opportunities, whereas the propensity to migrate may decrease in Linne'vatn, increasing the frequency of the Normal morph. The Dwarf charr was the most genetically distinct group. Identifying the biological basis for small body size should elucidate the potential for increased growth and subsequent interbreeding with sympatric morphs. Overall, neutral and adaptive genomic differentiation between allopatric and some sympatric morphs suggests that the response of Arctic charr to climate change will be variable across freshwater ecosystems.

show abstract

Section: Discussionmentioning

confidence: 99%

Characterizing neutral and adaptive genomic differentiation in a changing climate: The most northerly freshwater fish as a model

O’Malley

Vaux

Black

2019

Ecology and Evolution

View full text Add to dashboard Cite

show abstract

“…Linnévatn is 4.6 km 2 and connected to the sea by a 2 km stream. It is the second largest lake on Svalbard, with a maximum depth of 37 m (Bøyum & Kjensmo, 1978). Due to runoff from the glaciers in the 55 km 2 catchment, transparency during the summer is low, with Secchi disc readings varying between 0.3 and 3 m in August, depending on air temperature and glacier melting (Svenning et al, 2007).…”

Section: Methodsmentioning

confidence: 99%

“…The ice-free period may be less than 10 weeks, and extends from the end of July to early October (Bøyum & Kjensmo, 1978;Svenning et al, 2007). Linnévatn is a cold monomictic lake.…”

Section: Methodsmentioning

confidence: 99%

High lacustrine gillnet catchability of anadromous Arctic charr

2010

View full text Add to dashboard Cite

Arctic charr is the only freshwater fish in most of the High Arctic, with both resident, anadromous, and landlocked populations present. The anadromous Arctic charr is particularly highly sought-after, and has been an important food source for people living in Arctic regions. A recent decline in harvest in many areas has been related to overexploitation by extensive gillnetting. Very few studies, if any, have estimated the gillnet efficiency for harvesting anadromous Arctic charr. In this study, all anadromous Arctic charr ascending the lake, Linnévatn, in western Spitsbergen, Svalbard, were marked over a period of 5 weeks, in July-August 2008. Recaptures in the lake were obtained by gillnetting with three mesh sizes (39, 45, and 52 mm measured knot-to-knot) during three periods. The total number of anadromous charr in the lake was estimated by both Schnabel and Petersen mark-recapture methods. The catchability increased significantly with fish size. Anadromous charr in the length-class 40.0-56.9 cm captured by the legal mesh size in Svalbard lakes (52 mm) had a mean catchability of 0.0023 per gillnet per 2 h fishing effort, and the catch quota which is set at 40 charr for Linnévatn by the Governor of Svalbard, would have been filled by less than five gillnets, each used for 6 h. Although this short fishing time may give an overestimation of catchability due to the avoidance of gear saturation, the high catchability values still indicate that anadromous Arctic charr populations may be extremely vulnerable to gillnetting. Hence, in addition to catch quotas set for each population, a restriction on the number of gillnets allowed per harvester should also be considered.

show abstract

“…The 4.6 km 2 lake (4.7 km long, 1.3 km wide) has a main central-distal basin with a maximum water depth of 36 m and smaller lake sub-basins proximal to the Linnéelva inflow at the south end of the lake (Figure 1). The lake has been categorized as cold monomictic (Bøyum and Kjensmo, 1978), although recent warming has led to weakly stratified conditions for a few weeks in the summer. Lake ice cover typically persists from October to late June or early July.…”

Section: Study Areamentioning

confidence: 99%

Fluvial suspended sediment yields over hours to millennia in the High Arctic at proglacial Lake Linnévatnet, Svalbard

Schiefer

Kaufman

McKay

et al. 2017

Earth Surf Processes Landf

View full text Add to dashboard Cite

Sediment yield can be a sensitive indicator of catchment dynamics and environmental change. For a glacierized catchment in the High Arctic, we compiled and analyzed diverse sediment transfer data, spanning a wide range of temporal scales, to quantify catchment yields and explore landscape response to past and ongoing hydroclimatic variability. The dataset integrates rates of lake sedimentation from correlated varve records and repeated annual and seasonal sediment traps, augmented by multi‐year lake and fluvial monitoring. Consistent spatial patterns of deposition enabled reconstruction of catchment yields from varve‐ and trap‐based fluxes. We used hydroclimatic data and multivariate modeling to examine annual controls of sediment delivery over almost a century, and to examine shorter‐term controls of sediment transfer during peak glacier melt. Particle‐size analyses, especially for annual sediment traps, were used to further infer sediment transfer mechanisms and timing. Through the Medieval Warm Period and Little Ice Age, there were no apparent multi‐century trends in lake sedimentation rates, which were over three times greater than those during the mid‐Holocene when glaciers were diminished. Twentieth‐century sedimentation rates were greater than those of previous millennia, with a mid‐century step increase in mean yield from 240 to 425 Mg km−2 yr−1. Annual yields through the twentieth century showed significant positive relations with spring/summer temperature, rainfall, and peak discharge conditions. This finding is significant for the future of sediment transfer at Linnévatnet, and perhaps more broadly in the Arctic, where continued increases in temperature and rainfall are projected. For 2004–2010, annual yields ranged from 294 to 1330 Mg km−2 yr−1. Sediment trap volumes and particle‐size variations indicate that recent annual yields were largely dominated by spring to early summer transfer of relatively coarse‐grained sediment. Fluvial monitoring showed daily to hourly sediment transfer to be related to current and prior discharge, diurnal hysteresis, air temperature, and precipitation. Copyright © 2017 John Wiley & Sons, Ltd.

show abstract

Physiography of Lake Linnévatn, Western Spitsbergen

Cited by 9 publications

References 3 publications

Characterizing neutral and adaptive genomic differentiation in a changing climate: The most northerly freshwater fish as a model

Characterizing neutral and adaptive genomic differentiation in a changing climate: The most northerly freshwater fish as a model

High lacustrine gillnet catchability of anadromous Arctic charr

Fluvial suspended sediment yields over hours to millennia in the High Arctic at proglacial Lake Linnévatnet, Svalbard

Contact Info

Product

Resources

About