{"id":{"repo_id":"holar","oai_identifier":"oai:skemman.is:1946/53443"},"canonical_url":"https://search.dev.ndltd.org/etd/holar/oai:skemman.is:1946/53443","repository":{"repo_id":"holar","name":"Hólar University College","base_url":"https://skemman.is/oai/request"},"display":{"title":"Asynchrony in the dynamics of chironomids across six locations in northeastern Iceland","abstract":"Simultaneously studying population dynamics at multiple locations can provide insights into the ecological processes shaping changes in the abundances of species. Here, I examine 18-year time series of abundances of non-biting midges (Diptera: Chironomidae) from window trap samples at five lakes in northeastern Iceland: Miklavatn, Sílalækjarvatn, Skjálftavatn, Víkingavatn, and Mývatn. The largest lake, Mývatn, consists of two distinct basins which I treat as separate locations. Fluctuations in aggregate midge abundance show little correlation among locations, with even neighboring locations exhibiting asynchronous patterns. Such spatial asynchrony suggests that regional environmental forcing and inter-lake movement are insufficient to synchronize midge dynamics across sites. Instead, the observed patterns are consistent with the importance of lake-specific ecological processes, which may include differences in habitat structure, resource dynamics, species interactions, or local consumer-resource dynamics. The results have implications for conservation management of species such as insectivorous birds that can migrate between locations and take advantage of episodic, localized peaks in midge abundance.","abstract_html":"Simultaneously studying population dynamics at multiple locations can provide insights into the ecological processes shaping changes in the abundances of species. Here, I examine 18-year time series of abundances of non-biting midges (Diptera: Chironomidae) from window trap samples at five lakes in northeastern Iceland: Miklavatn, Sílalækjarvatn, Skjálftavatn, Víkingavatn, and Mývatn. The largest lake, Mývatn, consists of two distinct basins which I treat as separate locations. Fluctuations in aggregate midge abundance show little correlation among locations, with even neighboring locations exhibiting asynchronous patterns. Such spatial asynchrony suggests that regional environmental forcing and inter-lake movement are insufficient to synchronize midge dynamics across sites. Instead, the observed patterns are consistent with the importance of lake-specific ecological processes, which may include differences in habitat structure, resource dynamics, species interactions, or local consumer-resource dynamics. The results have implications for conservation management of species such as insectivorous birds that can migrate between locations and take advantage of episodic, localized peaks in midge abundance.","abstract_has_math":false,"creators":["Viktor Freyr Aðalsteinsson 1999-"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Háskólinn á Hólum"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2026,"date_issued":"2026-06-02T10:29:42Z","date_published":"2026-06-02T10:29:42Z","updated_at":"2026-07-27T19:56:59Z","subjects":["Sjávar- og vatnalíffræði"],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/1946/53443","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Háskólinn á Hólum"]},{"key":"dc:creator","label":"Author","values":["Viktor Freyr Aðalsteinsson 1999-"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2026-06-02T10:29:37Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2026-06-02T10:29:37Z"]},{"key":"dc:date.issued","label":"Date","values":["2026-06-02T10:29:42Z"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Sjávar- og vatnalíffræði"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/1946/53443"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Simultaneously studying population dynamics at multiple locations can provide insights into the ecological processes shaping changes in the abundances of species. Here, I examine 18-year time series of abundances of non-biting midges (Diptera: Chironomidae) from window trap samples at five lakes in northeastern Iceland: Miklavatn, Sílalækjarvatn, Skjálftavatn, Víkingavatn, and Mývatn. The largest lake, Mývatn, consists of two distinct basins which I treat as separate locations. Fluctuations in aggregate midge abundance show little correlation among locations, with even neighboring locations exhibiting asynchronous patterns. Such spatial asynchrony suggests that regional environmental forcing and inter-lake movement are insufficient to synchronize midge dynamics across sites. Instead, the observed patterns are consistent with the importance of lake-specific ecological processes, which may include differences in habitat structure, resource dynamics, species interactions, or local consumer-resource dynamics. The results have implications for conservation management of species such as insectivorous birds that can migrate between locations and take advantage of episodic, localized peaks in midge abundance.","Með því að rannsaka stofnsveiflur á mörgum stöðum samtímis má öðlast mikilvæga innsýn um þá vistfræðilegu ferla sem móta breytingar á stofnstærð tegunda. Í þessari rannsókn greindi ég 18 ára tímaröð gagna um stofnþéttleika rykmýs (Diptera: Chironomidae) byggða á gluggagildrusýnum úr fimm vötnum á Norðausturlandi: Miklavatni, Sílalækjarvatni, Skjálftavatni, Víkingavatni og Mývatni. Stærsta vatnið, Mývatn, skiptist í tvo flóa sem hér eru meðhöndlaðir sem aðskilin rannsóknarsvæði. Sveiflur í heildarstofnstærð rykmýs sýna litla fylgni milli staða, jafnvel milli nálægra vatna, og eru ósamhverf mynstur þar áberandi. Slík staðbundin ósamhverfa bendir til þess að svæðisbundin umhverfisáhrif og flutningur milli vatna séu ekki nægjanleg til að samræma stofnsveiflur rykmýs milli staða. Þess í stað styðja niðurstöðurnar þá ályktun að staðbundin vistfræðileg ferli skipti mestu máli, þar á meðal mögulegur munur á búsvæðagerð, breytileika í magni og dreifingu auðlinda, samskiptum tegunda og staðbundnum neytenda–auðlindakerfum. Niðurstöðurnar hafa jafnframt þýðingu fyrir vöktun og verndun tegunda á borð við fugla sem éta skordýr, sem geta flust milli staða og nýtt sér tíma- og staðbundna toppa í mýflugnastofnum."]},{"key":"dc:title","label":"Title","values":["Asynchrony in the dynamics of chironomids across six locations in northeastern Iceland"]}]}],"canonical_facts":{"dc:contributor":["Háskólinn á Hólum"],"dc:creator":["Viktor Freyr Aðalsteinsson 1999-"],"dc:date.accessioned":["2026-06-02T10:29:37Z"],"dc:date.available":["2026-06-02T10:29:37Z"],"dc:date.issued":["2026-06-02T10:29:42Z"],"dc:description.abstract":["Simultaneously studying population dynamics at multiple locations can provide insights into the ecological processes shaping changes in the abundances of species. Here, I examine 18-year time series of abundances of non-biting midges (Diptera: Chironomidae) from window trap samples at five lakes in northeastern Iceland: Miklavatn, Sílalækjarvatn, Skjálftavatn, Víkingavatn, and Mývatn. The largest lake, Mývatn, consists of two distinct basins which I treat as separate locations. Fluctuations in aggregate midge abundance show little correlation among locations, with even neighboring locations exhibiting asynchronous patterns. Such spatial asynchrony suggests that regional environmental forcing and inter-lake movement are insufficient to synchronize midge dynamics across sites. Instead, the observed patterns are consistent with the importance of lake-specific ecological processes, which may include differences in habitat structure, resource dynamics, species interactions, or local consumer-resource dynamics. The results have implications for conservation management of species such as insectivorous birds that can migrate between locations and take advantage of episodic, localized peaks in midge abundance.","Með því að rannsaka stofnsveiflur á mörgum stöðum samtímis má öðlast mikilvæga innsýn um þá vistfræðilegu ferla sem móta breytingar á stofnstærð tegunda. Í þessari rannsókn greindi ég 18 ára tímaröð gagna um stofnþéttleika rykmýs (Diptera: Chironomidae) byggða á gluggagildrusýnum úr fimm vötnum á Norðausturlandi: Miklavatni, Sílalækjarvatni, Skjálftavatni, Víkingavatni og Mývatni. Stærsta vatnið, Mývatn, skiptist í tvo flóa sem hér eru meðhöndlaðir sem aðskilin rannsóknarsvæði. Sveiflur í heildarstofnstærð rykmýs sýna litla fylgni milli staða, jafnvel milli nálægra vatna, og eru ósamhverf mynstur þar áberandi. Slík staðbundin ósamhverfa bendir til þess að svæðisbundin umhverfisáhrif og flutningur milli vatna séu ekki nægjanleg til að samræma stofnsveiflur rykmýs milli staða. Þess í stað styðja niðurstöðurnar þá ályktun að staðbundin vistfræðileg ferli skipti mestu máli, þar á meðal mögulegur munur á búsvæðagerð, breytileika í magni og dreifingu auðlinda, samskiptum tegunda og staðbundnum neytenda–auðlindakerfum. Niðurstöðurnar hafa jafnframt þýðingu fyrir vöktun og verndun tegunda á borð við fugla sem éta skordýr, sem geta flust milli staða og nýtt sér tíma- og staðbundna toppa í mýflugnastofnum."],"dc:identifier.uri":["https://hdl.handle.net/1946/53443"],"dc:language.iso":["en"],"dc:subject":["Sjávar- og vatnalíffræði"],"dc:title":["Asynchrony in the dynamics of chironomids across six locations in northeastern Iceland"],"dc:type":["Thesis"]},"updated_at":"2026-07-27T19:56:59Z"}