Data from: Lake size and fish diversity determine resource use and trophic position of a top predator in high-latitude lakes

Prey preference of top predators and energy flow across habitat boundaries are of fundamental importance for structure and function of aquatic and terrestrial ecosystems, as they may have strong effects on production, species diversity, and food-web stability. In lakes, littoral and pelagic food-web...

Full description

Bibliographic Details
Main Authors: Eloranta, Antti P., Kahilainen, Kimmo K., Amundsen, Per-Arne, Knudsen, Rune, Harrod, Chris, Jones, Roger I.
Format: Dataset
Language:unknown
Published: Dryad 2021
Subjects:
geo
Online Access:https://doi.org/10.5061/dryad.sc59f
id fttriple:oai:gotriple.eu:50|dedup_wf_001::9d967995ac07a5ea6f9ea527ecc4d1ee
record_format openpolar
spelling fttriple:oai:gotriple.eu:50|dedup_wf_001::9d967995ac07a5ea6f9ea527ecc4d1ee 2023-05-15T14:30:01+02:00 Data from: Lake size and fish diversity determine resource use and trophic position of a top predator in high-latitude lakes Eloranta, Antti P. Kahilainen, Kimmo K. Amundsen, Per-Arne Knudsen, Rune Harrod, Chris Jones, Roger I. 2021-07-05 https://doi.org/10.5061/dryad.sc59f undefined unknown Dryad https://dx.doi.org/10.5061/dryad.sc59f http://dx.doi.org/10.5061/dryad.sc59f lic_creative-commons 10.5061/dryad.sc59f oai:easy.dans.knaw.nl:easy-dataset:88701 oai:services.nod.dans.knaw.nl:Products/dans:oai:easy.dans.knaw.nl:easy-dataset:88701 10|openaire____::9e3be59865b2c1c335d32dae2fe7b254 re3data_____::r3d100000044 10|re3data_____::84e123776089ce3c7a33db98d9cd15a8 10|eurocrisdris::fe4903425d9040f680d8610d9079ea14 10|re3data_____::94816e6421eeb072e7742ce6a9decc5f 10|openaire____::081b82f96300b6a6e3d282bad31cb6e2 10|opendoar____::8b6dd7db9af49e67306feb59a8bdc52c stable isotope analysis resource competition benthic trophic niche energy mobilization Salvelinus alpinus Northern Europe Life sciences medicine and health care envir geo Dataset https://vocabularies.coar-repositories.org/resource_types/c_ddb1/ 2021 fttriple https://doi.org/10.5061/dryad.sc59f 2023-01-22T16:51:33Z Prey preference of top predators and energy flow across habitat boundaries are of fundamental importance for structure and function of aquatic and terrestrial ecosystems, as they may have strong effects on production, species diversity, and food-web stability. In lakes, littoral and pelagic food-web compartments are typically coupled and controlled by generalist fish top predators. However, the extent and determinants of such coupling remains a topical area of ecological research and is largely unknown in oligotrophic high-latitude lakes. We analyzed food-web structure and resource use by a generalist top predator, the Arctic charr Salvelinus alpinus (L.), in 17 oligotrophic subarctic lakes covering a marked gradient in size (0.5–1084 km2) and fish species richness (2–13 species). We expected top predators to shift from littoral to pelagic energy sources with increasing lake size, as the availability of pelagic prey resources and the competition for littoral prey are both likely to be higher in large lakes with multispecies fish communities. We also expected top predators to occupy a higher trophic position in lakes with greater fish species richness due to potential substitution of intermediate consumers (prey fish) and increased piscivory by top predators. Based on stable carbon and nitrogen isotope analyses, the mean reliance of Arctic charr on littoral energy sources showed a significant negative relationship with lake surface area, whereas the mean trophic position of Arctic charr, reflecting the lake food-chain length, increased with fish species richness. These results were supported by stomach contents data demonstrating a shift of Arctic charr from an invertebrate-dominated diet to piscivory on pelagic fish. Our study highlights that, because they determine the main energy source (littoral vs. pelagic) and the trophic position of generalist top predators, ecosystem size and fish diversity are particularly important factors influencing function and structure of food webs in high-latitude lakes. Lake ... Dataset Arctic charr Arctic Salvelinus alpinus Subarctic Unknown Arctic
institution Open Polar
collection Unknown
op_collection_id fttriple
language unknown
topic stable isotope analysis
resource competition
benthic
trophic niche
energy mobilization
Salvelinus alpinus
Northern Europe
Life sciences
medicine and health care
envir
geo
spellingShingle stable isotope analysis
resource competition
benthic
trophic niche
energy mobilization
Salvelinus alpinus
Northern Europe
Life sciences
medicine and health care
envir
geo
Eloranta, Antti P.
Kahilainen, Kimmo K.
Amundsen, Per-Arne
Knudsen, Rune
Harrod, Chris
Jones, Roger I.
Data from: Lake size and fish diversity determine resource use and trophic position of a top predator in high-latitude lakes
topic_facet stable isotope analysis
resource competition
benthic
trophic niche
energy mobilization
Salvelinus alpinus
Northern Europe
Life sciences
medicine and health care
envir
geo
description Prey preference of top predators and energy flow across habitat boundaries are of fundamental importance for structure and function of aquatic and terrestrial ecosystems, as they may have strong effects on production, species diversity, and food-web stability. In lakes, littoral and pelagic food-web compartments are typically coupled and controlled by generalist fish top predators. However, the extent and determinants of such coupling remains a topical area of ecological research and is largely unknown in oligotrophic high-latitude lakes. We analyzed food-web structure and resource use by a generalist top predator, the Arctic charr Salvelinus alpinus (L.), in 17 oligotrophic subarctic lakes covering a marked gradient in size (0.5–1084 km2) and fish species richness (2–13 species). We expected top predators to shift from littoral to pelagic energy sources with increasing lake size, as the availability of pelagic prey resources and the competition for littoral prey are both likely to be higher in large lakes with multispecies fish communities. We also expected top predators to occupy a higher trophic position in lakes with greater fish species richness due to potential substitution of intermediate consumers (prey fish) and increased piscivory by top predators. Based on stable carbon and nitrogen isotope analyses, the mean reliance of Arctic charr on littoral energy sources showed a significant negative relationship with lake surface area, whereas the mean trophic position of Arctic charr, reflecting the lake food-chain length, increased with fish species richness. These results were supported by stomach contents data demonstrating a shift of Arctic charr from an invertebrate-dominated diet to piscivory on pelagic fish. Our study highlights that, because they determine the main energy source (littoral vs. pelagic) and the trophic position of generalist top predators, ecosystem size and fish diversity are particularly important factors influencing function and structure of food webs in high-latitude lakes. Lake ...
format Dataset
author Eloranta, Antti P.
Kahilainen, Kimmo K.
Amundsen, Per-Arne
Knudsen, Rune
Harrod, Chris
Jones, Roger I.
author_facet Eloranta, Antti P.
Kahilainen, Kimmo K.
Amundsen, Per-Arne
Knudsen, Rune
Harrod, Chris
Jones, Roger I.
author_sort Eloranta, Antti P.
title Data from: Lake size and fish diversity determine resource use and trophic position of a top predator in high-latitude lakes
title_short Data from: Lake size and fish diversity determine resource use and trophic position of a top predator in high-latitude lakes
title_full Data from: Lake size and fish diversity determine resource use and trophic position of a top predator in high-latitude lakes
title_fullStr Data from: Lake size and fish diversity determine resource use and trophic position of a top predator in high-latitude lakes
title_full_unstemmed Data from: Lake size and fish diversity determine resource use and trophic position of a top predator in high-latitude lakes
title_sort data from: lake size and fish diversity determine resource use and trophic position of a top predator in high-latitude lakes
publisher Dryad
publishDate 2021
url https://doi.org/10.5061/dryad.sc59f
geographic Arctic
geographic_facet Arctic
genre Arctic charr
Arctic
Salvelinus alpinus
Subarctic
genre_facet Arctic charr
Arctic
Salvelinus alpinus
Subarctic
op_source 10.5061/dryad.sc59f
oai:easy.dans.knaw.nl:easy-dataset:88701
oai:services.nod.dans.knaw.nl:Products/dans:oai:easy.dans.knaw.nl:easy-dataset:88701
10|openaire____::9e3be59865b2c1c335d32dae2fe7b254
re3data_____::r3d100000044
10|re3data_____::84e123776089ce3c7a33db98d9cd15a8
10|eurocrisdris::fe4903425d9040f680d8610d9079ea14
10|re3data_____::94816e6421eeb072e7742ce6a9decc5f
10|openaire____::081b82f96300b6a6e3d282bad31cb6e2
10|opendoar____::8b6dd7db9af49e67306feb59a8bdc52c
op_relation https://dx.doi.org/10.5061/dryad.sc59f
http://dx.doi.org/10.5061/dryad.sc59f
op_rights lic_creative-commons
op_doi https://doi.org/10.5061/dryad.sc59f
_version_ 1766303954690375680