Browsing NTNU Open by Author "Ekrem, Torbjørn"
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A multi-marker metabarcoding approach to study tardigrade diversity in forest ecosystems.
Topstad, Lasse (Master thesis, 2019)Som annen mikroskopisk fauna blir bjørnedyr ofte oversett i økologiske undersøkelser. Med sin kosmopolitiske utbredelse i alt fra sedimenter på havets dyp til høyalpine fjellområder, spiller bjørnedyr viktige roller i mange ... -
A new surface gliding species of Chironomidae: An independent invasion of marine environments and its evolutionary implications
Qi, Xin; Lin, Xiaolong; Ekrem, Torbjørn; Beutel, Rolf Georg; Song, Chao; Orlov, Igor; Chen, Chun-Tang; Wang, Xin-hua (Journal article; Peer reviewed, 2018)Insects have invaded marine habitats only rarely and secondarily. Recently, we discovered a flightless dipteran species skating rapidly on the surface of seawater ponds at the Pacific coast of eastern China. Morphological ... -
A review of Norwegian Gymnometriocnemus (Diptera, Chironomidae) including the description of two new species and a new name for Gymnometriocnemus volitans (Goetghebuer) sensu Brundin
Stur, Elisabeth; Ekrem, Torbjørn (Journal article; Peer reviewed, 2015)Abstract Examination of the syntypes of Metriocnemus volitans Goetghebuer, 1940 revealed that these specimens belong to the genus Chaetocladius and are not con-specific with Gymnometriocnemus volitans (Goetghebuer, 1940) ... -
Ancient origin and maternal inheritance of blue cuckoo eggs
Røskaft, Eivin; Møller, Anders P.; Liang, Wei; Sorenson, Michael D; Yang, Canchao; Takasu, Fugo; Stokke, Bård Gunnar; Fossøy, Frode; Moksnes, Arne; Ekrem, Torbjørn; Rutila, Jarkko (Journal article; Peer reviewed, 2016)Maternal inheritance via the female-specific W chromosome was long ago proposed as a potential solution to the evolutionary enigma of co-existing host-specific races (or ‘gentes’) in avian brood parasites. Here we report ... -
Back from the Past: DNA Barcodes and Morphology Support Ablabesmyia americana Fittkau as a Valid Species (Diptera: Chironomidae)
Stur, Elisabeth; da Silva, Fabio Laurindo; Ekrem, Torbjørn (Journal article; Peer reviewed, 2019)Abstract: Short, standardized gene fragments for species identification (DNA barcodes) have proven effective in delineating closely-related insect species, and can be critical characters to include in taxonomic studies. ... -
The Chironomidae (Diptera) of Svalbard and Jan Mayen
Stur, Elisabeth; Ekrem, Torbjørn (Peer reviewed; Journal article, 2020)Non-biting midges of the fly family Chironomidae are extremely abundant and diverse in Arctic regions and are essential components of Arctic ecosystems. Modern identification tools based on documented records of Arctic ... -
Choice of DNA extraction method affects DNA metabarcoding of unsorted invertebrate bulk samples
Majaneva, Markus; Diserud, Ola Håvard; Hajibabaei, Mehrdad; Eagle, Shannon; Ekrem, Torbjørn (Journal article; Peer reviewed, 2018)Characterisation of freshwater benthic biodiversity using DNA metabarcoding may allow more cost-effective environmental assessments than the current morphological-based assessment methods. DNA metabarcoding methods where ... -
DNA barcode data reveal biogeographic trends in Arctic non-biting midges
Ekrem, Torbjørn; Stur, Elisabeth; Orton, Matthew J.; Adamowicz, Sarah J. (Journal article; Peer reviewed, 2018)Chironomid flies (non-biting midges) are among the most abundant and diverse animals in Arctic regions, but detailed analyses of species distributions and biogeographical patterns are hampered by challenging taxonomy and ... -
DNA barcode reference libraries for the monitoring of aquatic biota in Europe: Gap-analysis and recommendations for future work
Weigand, Hannah; Beermann, Arne J.; Čiampor, Fedor; Costa, Filipe O.; Csabai, Zoltán; Duarte, Sofia; Geiger, Matthias F.; Grabowski, Michał; Rimet, Frédéric; Rulik, Björn; Strand, Malin; Szucsich, Nicholaus; Weigand, Alexander M.; Willassen, Endre; Wyler, Sofia A.; Bouchez, Agnès; Borja, Ángel; Čiamporová-Zaťovičová, Zuzana; Ferreira, Sónia; Dijkstra, Klaas-Douwe B.; Eisendle, Ursula; Freyhof, Jörg; Gadawski, Piotr; Graf, Wolfram; Haegerbaeumer, Arne; van der Hoorn, Berry B.; Japoshvili, Bella; Keresztes, Lujza; Keskin, Emre; Leese, Florian; Macher, Jan N.; Mamos, Tomasz; Paz, Guy; Pešić, Vladimir; Pfannkuchen, Daniela Maric; Pfannkuchen, Martin Andreas; Price, Benjamin W.; Rinkevich, Buki; Teixeira, Marcos A.L.; Várbíró, Gábor; Ekrem, Torbjørn (Journal article; Peer reviewed, 2019)Effective identification of species using short DNA fragments (DNA barcoding and DNA metabarcoding) requires reliable sequence reference libraries of known taxa. Both taxonomically comprehensive coverage and content quality ... -
DNA barcodes and morphology reveal unrecognized species in Chironomidae (Diptera)
Lin, Xiaolong; Stur, Elisabeth; Ekrem, Torbjørn (Journal article; Peer reviewed, 2017)For over a decade, DNA barcoding has proven an effective modern tool in taxonomy, evolutionary biology and biodiversity research. Many new species have been discovered and described with DNA barcodes as part of their ... -
DNA barcoding for species identification of insect skins: A test on Chironomidae (Diptera) pupal exuviae
Kranzfelder, Petra; Ekrem, Torbjørn; Stur, Elisabeth (Journal article; Peer reviewed, 2017)Chironomidae (Diptera) pupal exuviae samples are commonly used for biological monitoring of aquatic habitats. DNA barcoding has proved useful for species identification of chironomid life stages containing cellular tissue, ... -
DNA metabarcoding adds valuable information for management of biodiversity in roadside stormwater ponds
Sun, Zhenhua; Majaneva, Markus; Sokolova, Ekaterina; Rauch, Sébastien; Meland, Sondre; Ekrem, Torbjørn (Journal article; Peer reviewed, 2019)Stormwater ponds are used to compensate for the adverse effects that road runoff might have on the natural environment. Depending on their design and placement, stormwater ponds can act as both refugia and traps for local ... -
DNA-metastrekkoding til undersøkelser av invertebrater i ferskvann
Ekrem, Torbjørn; Majaneva, Markus (NTNU Vitenskapsmuseet naturhistorisk notat;, Research report, 2019)DNA-metastrekkoding (metabarcoding) er en teknikk der en ved hjelp av korte DNA-sekvenser kan identifisere artene i en miljø- eller bulkprøve (usortert samleprøve). Metoden har potensiale til å revolusjonere miljøovervåkning ... -
DNAqua-Net: Developing new genetic tools for bioassessment and monitoring of aquatic ecosystems in Europe
Leese, Florian; Altermatt, F; Bouchez, A; Ekrem, Torbjørn; Hering, D; Meissner, K; Mergen, P; Pawlowski, J; Piggott, JJ; Rimet, F; Steinke, D; Taberlet, P; Weigand, AM; Abarankov, K; Beja, P; Bervoets, L; Björnsdóttir, S; Boets, P; Boggero, A; Bones, Atle M.; Vrålstad, Trude (Journal article; Peer reviewed, 2016)The protection, preservation and restoration of aquatic ecosystems and their functions are of global importance. For European states it became legally binding mainly through the EU-Water Framework Directive (WFD). In order ... -
Environmental DNA filtration techniques affect recovered biodiversity
Majaneva, Markus; Diserud, Ola Håvard; Eagle, Shannon; Boström, Erik; Hajibabaei, Mehrdad; Ekrem, Torbjørn (Journal article; Peer reviewed, 2018)Freshwater metazoan biodiversity assessment using environmental DNA (eDNA) captured on filters offers new opportunities for water quality management. Filtering of water in the field is a logistical advantage compared to ... -
Exploring Genetic Divergence in a Species-Rich Insect Genus Using 2790 DNA Barcodes
Lin, Xiaolong; Stur, Elisabeth; Ekrem, Torbjørn (Journal article; Peer reviewed, 2015-09-25)DNA barcoding using a fragment of the mitochondrial cytochrome c oxidase subunit 1 gene (COI) has proven to be successful for species-level identification in many animal groups. However, most studies have been focused on ... -
Exploring species boundaries with multiple genetic loci using empirical data from non-biting midges
Lin, Xiaolong; Stur, Elisabeth; Ekrem, Torbjørn (Journal article; Peer reviewed, 2018)Over the past decade, molecular approaches to species delimitation have seen rapid development. However, species delimitation based on a single locus, for example, DNA barcodes, can lead to inaccurate results in cases of ... -
Investigating suburban micromoth diversity using DNA barcoding of malaise trap samples
Aagaard, Kaare; Berggren, Kai; McClenaghan, Beverly; Sones, Jayme; Hebert, Paul D. N.; Ekrem, Torbjørn (Journal article; Peer reviewed, 2016)Micromoths can be challenging to identify based on morphology and are frequently omitted in assessments of moth diversity. However, their species richness and biology make them important components of terrestrial ecosystems. ... -
Kartlegging av marin bløtbunnsfauna - Metodeutvikling i hydrolittoralsonen
Haugen, Grethe Sundet (Master thesis, 2016)Det er gjort få kvalitative undersøkelser på bløtbunnssamfunnet i hydrolittoralen i Norge. I denne studien ble artssammensetningen i littoralsonen fra tre forskjellige bløtbunnsstrender i Sør-Trøndelag undersøkt ved en ... -
Molecular phylogeny and temporal diversification of Tanytarsus van der Wulp (Diptera: Chironomidae) support generic synonymies, a new classification and centre of origin
Lin, Xiaolong; Stur, Elisabeth; Ekrem, Torbjørn (Journal article; Peer reviewed, 2018)Tanytarsus van der Wulp, with 355 currently known valid species, is a comparatively large genus of nonbiting midges (Diptera: Chironomidae). Relationships among Tanytarsus and associated genera and among species in the ...