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O. Hellgren · SciRah

Researcher profile · Semantic Scholar

O. Hellgren

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O. Hellgren — researcher profile on SciRah

h-index: 39
Works: 93
Citations: 6,567

Most-cited papers

A NEW PCR ASSAY FOR SIMULTANEOUS STUDIES OF LEUCOCYTOZOON, PLASMODIUM, AND HAEMOPROTEUS FROM AVIAN BLOOD
O. Hellgren, J. Waldenström, S. Bensch
2004Journal of Parasitology1,023 citations
Semantic Scholar
MalAvi: a public database of malaria parasites and related haemosporidians in avian hosts based on mitochondrial cytochrome b lineages
S. Bensch, O. Hellgren, J. Pérez-Tris
2009Molecular Ecology Resources1,010 citations
Semantic Scholar
LINKAGE BETWEEN NUCLEAR AND MITOCHONDRIAL DNA SEQUENCES IN AVIAN MALARIA PARASITES: MULTIPLE CASES OF CRYPTIC SPECIATION?
S. Bensch, J. Pérez-Tris, J. Waldenström, O. Hellgren
2004Evolution; international journal of organic evolution337 citations Open access
Semantic Scholar
Flight Speeds among Bird Species: Allometric and Phylogenetic Effects
T. Alerstam, M. Rosén, Johan Bäckman, P. Ericson +1 more
2007PLoS Biology313 citations Open access
Semantic Scholar
Diversity, Loss, and Gain of Malaria Parasites in a Globally Invasive Bird
A. Marzal, R. Ricklefs, G. Valkiūnas, T. Albayrak +23 more
2011PLoS ONE295 citations Open access
Semantic Scholar
What are malaria parasites?
J. Pérez-Tris, D. Hasselquist, O. Hellgren, Asta Križanauskienė +2 more
2005Trends in Parasitology270 citations
Semantic Scholar
Nested Cytochrome B Polymerase Chain Reaction Diagnostics Underestimate Mixed Infections of Avian Blood Haemosporidian Parasites: Microscopy is Still Essential
G. Valkiūnas, S. Bensch, T. Iezhova, Asta Križanauskienė +2 more
2006Journal of Parasitology244 citations
Semantic Scholar
Detecting shifts of transmission areas in avian blood parasites — a phylogenetic approach
O. Hellgren, J. Waldenström, J. Pérez-Tris, Eszter Szöll +5 more
2007Molecular Ecology214 citations
Semantic Scholar
A jack-of-all-trades and still a master of some: prevalence and host range in avian malaria and related blood parasites.
O. Hellgren, J. Pérez-Tris, S. Bensch
2009Ecology209 citations
Semantic Scholar
DIVERSITY AND PHYLOGENY OF MITOCHONDRIAL CYTOCHROME B LINEAGES FROM SIX MORPHOSPECIES OF AVIAN HAEMOPROTEUS (HAEMOSPORIDA: HAEMOPROTEIDAE)
O. Hellgren, Asta Križanauskienė, G. Valkiūnas, S. Bensch
2007Journal of Parasitology166 citations
Semantic Scholar
VARIATION IN HOST SPECIFICITY BETWEEN SPECIES OF AVIAN HEMOSPORIDIAN PARASITES: EVIDENCE FROM PARASITE MORPHOLOGY AND CYTOCHROME B GENE SEQUENCES
Asta Križanauskienė, O. Hellgren, V. Kosarev, L. Sokolov +2 more
2006Journal of Parasitology136 citations
Semantic Scholar
Bird hosts, blood parasites and their vectors — associations uncovered by molecular analyses of blackfly blood meals
O. Hellgren, Staffan Bensch, B. Malmqvist
2008Molecular Ecology133 citations
Semantic Scholar
Within-Host Speciation of Malaria Parasites
J. Pérez-Tris, O. Hellgren, Asta Križanauskienė, J. Waldenström +5 more
2007PLoS ONE122 citations Open access
Semantic Scholar
Vertebrate host specificity of wild–caught blackflies revealed by mitochondrial DNA in blood
B. Malmqvist, Darius Straševičius, O. Hellgren, P. Adler +1 more
2004Proceedings of the Royal Society of London. Series B: Biological Sciences116 citations Open access
Semantic Scholar
Global phylogeography of the avian malaria pathogenPlasmodium relictumbased on MSP1 allelic diversity
O. Hellgren, C. Atkinson, S. Bensch, T. Albayrak +11 more
201593 citations
Semantic Scholar
Avian migration and the distribution of malaria parasites in New World passerine birds
Robert E. Ricklefs, Matthew C. I. Medeiros, Vincenzo A. Ellis, M. Svensson-Coelho +10 more
201788 citations Open access
Semantic Scholar
The Avian Transcriptome Response to Malaria Infection
Elin Videvall, C. Cornwallis, V. Palinauskas, G. Valkiūnas +1 more
2015Molecular biology and evolution88 citations Open access
Semantic Scholar
Explaining prevalence, diversity and host specificity in a community of avian haemosporidian parasites
Vincenzo A. Ellis, Xi Huang, H. Westerdahl, Jane Jönsson +7 more
202084 citations Open access
Semantic Scholar
Major shifts in gut microbiota during development and its relationship to growth in ostriches
Elin Videvall, Se-Jin Song, H. Bensch, M. Strandh +7 more
2019Molecular Ecology81 citations Open access
Semantic Scholar
Linkage between mitochondrial cytochrome b lineages and morphospecies of two avian malaria parasites, with a description of Plasmodium (Novyella) ashfordi sp. nov
G. Valkiūnas, Pavel Zehtindjiev, O. Hellgren, M. Ilieva +2 more
2007Parasitology Research80 citations
Semantic Scholar
MIGRATORY BEHAVIOR OF BIRDS AFFECTS THEIR COEVOLUTIONARY RELATIONSHIP WITH BLOOD PARASITES
T. Jenkins, G. Thomas, O. Hellgren, I. Owens
2012Evolution; international journal of organic evolution78 citations
Semantic Scholar
Multiple cryptic species of sympatric generalists within the avian blood parasite Haemoproteus majoris
E. Nilsson, H. Taubert, O. Hellgren, Xi Huang +4 more
2016Journal of Evolutionary Biology76 citations Open access
Semantic Scholar
Global drivers of avian haemosporidian infections vary across zoogeographical regions
A. Fecchio, N. Clark, J. Bell, Heather R. Skeen +38 more
2021Global Ecology and Biogeography75 citations Open access
Semantic Scholar
The Genome of Haemoproteus tartakovskyi and Its Relationship to Human Malaria Parasites
S. Bensch, B. Canbäck, J. DeBarry, T. Johansson +5 more
2016Genome Biology and Evolution69 citations Open access
Semantic Scholar
Evolution of a cluster of innate immune genes (β-defensins) along the ancestral lines of chicken and zebra finch
O. Hellgren, R. Ekblom
2010Immunome Research65 citations Open access
Semantic Scholar
Molecular phylogenetic and morphological analysis of haemosporidian parasites (Haemosporida) in a naturally infected European songbird, the blackcap Sylvia atricapilla, with description of Haemoproteus pallidulus sp. nov.
Asta Križanauskienė, J. Pérez-Tris, V. Palinauskas, O. Hellgren +2 more
2009Parasitology57 citations
Semantic Scholar
The transcriptome of the avian malaria parasite Plasmodium ashfordi displays host-specific gene expression
Elin Videvall, C. Cornwallis, D. Ahrén, V. Palinauskas +2 more
2016bioRxiv56 citations Open access
Semantic Scholar
The occurrence of haemosporidian parasites in the Fennoscandian bluethroat (Luscinia svecica) population
O. Hellgren
2004Journal of Ornithology54 citations
Semantic Scholar
Parallelism and historical contingency during rapid ecotype divergence in an isopod
F. Eroukhmanoff, Anders Hargeby, N. N. Arnberg, O. Hellgren +2 more
2009Journal of Evolutionary Biology52 citations
Semantic Scholar
Early-life gut dysbiosis linked to juvenile mortality in ostriches
Elin Videvall, Se-Jin Song, H. Bensch, M. Strandh +7 more
2020Microbiome51 citations Open access
Semantic Scholar
LOW HAEMOSPORIDIAN DIVERSITY AND ONE KEY-HOST SPECIES IN A BIRD MALARIA COMMUNITY ON A MID-ATLANTIC ISLAND (SÃO MIGUEL, AZORES)
O. Hellgren, Asta Križanauskienė, D. Hasselquist, S. Bensch
2011Journal of Wildlife Diseases51 citations Open access
Semantic Scholar
MOLECULAR PHYLOGENETIC ANALYSIS OF CIRCUMNUCLEAR HEMOPROTEIDS (HAEMOSPORIDA: HAEMOPROTEIDAE) OF SYLVIID BIRDS, WITH A DESCRIPTION OF HAEMOPROTEUS PARABELOPOLSKYI SP. NOV
G. Valkiūnas, Asta Križanauskienė, T. Iezhova, O. Hellgren +1 more
2007Journal of Parasitology51 citations
Semantic Scholar
Circannual variation in blood parasitism in a sub‐Saharan migrant passerine bird, the garden warbler
O. Hellgren, M. Wood, J. Waldenström, D. Hasselquist +3 more
2013Journal of Evolutionary Biology48 citations Open access
Semantic Scholar
The Evolution of Innate Immune Genes: Purifying and Balancing Selection on β-Defensins in Waterfowl.
J. Chapman, O. Hellgren, Anu S. Helin, R. Kraus +2 more
2016Molecular biology and evolution46 citations Open access
Semantic Scholar
How can we determine the molecular clock of malaria parasites?
S. Bensch, O. Hellgren, Asta Križanauskienė, V. Palinauskas +3 more
2013Trends in Parasitology46 citations
Semantic Scholar
Locus‐specific protocol for nine different innate immune genes (antimicrobial peptides: β‐defensins) across passerine bird species reveals within‐species coding variation and a case of trans‐species polymorphisms
O. Hellgren, B. Sheldon
2011Molecular Ecology Resources46 citations
Semantic Scholar
The genetic structure of Borrelia afzelii varies with geographic but not ecological sampling scale
O. Hellgren, M. Andersson, L. Råberg
2011Journal of Evolutionary Biology46 citations
Semantic Scholar
In vitro tests of natural allelic variation of innate immune genes (avian β‐defensins) reveal functional differences in microbial inhibition
O. Hellgren, Bc C. Sheldon, A. Buckling
2010Journal of Evolutionary Biology42 citations Open access
Semantic Scholar
Identification and characterization of the merozoite surface protein 1 (msp1) gene in a host-generalist avian malaria parasite, Plasmodium relictum (lineages SGS1 and GRW4) with the use of blood transcriptome
O. Hellgren, M. Kutzer, S. Bensch, G. Valkiūnas +1 more
2013Malaria Journal39 citations Open access
Semantic Scholar
Host Transcriptional Responses to High- and Low-Virulent Avian Malaria Parasites
Elin Videvall, V. Palinauskas, G. Valkiūnas, O. Hellgren
2020American Naturalist34 citations Open access
Semantic Scholar
A Cautionary Note on the Use of Nested PCR for Parasite Screening—An Example From Avian Blood Parasites
E. Szöllősi, O. Hellgren, D. Hasselquist
2008Journal of Parasitology31 citations
Semantic Scholar
A comparison between methods used to control nutrient supply
O. Hellgren, T. Ingestad
199630 citations
Semantic Scholar
The epidemiology underlying age-related avian malaria infection in a long-lived host: the mute swan Cygnus olor
M. Wood, D. Childs, A. Davies, O. Hellgren +3 more
201324 citations Open access
Semantic Scholar
Feather Mites and Internal Parasites in Small Ground Finches (Geospiza fuliginosa, Emberizidae) From the Galapagos Islands (Equador)
Karin M. Lindström, O. Dolnik, M. Yabsley, O. Hellgren +3 more
2009Journal of Parasitology21 citations
Semantic Scholar
The success of sequence capture in relation to phylogenetic distance from a reference genome: a case study of avian haemosporidian parasites.
Xi Huang, R. Hansson, V. Palinauskas, G. Valkiūnas +2 more
2018International Journal of Parasitology20 citations
Semantic Scholar
The Use of Molecular Methods in Studies of Avian Haemosporidians
S. Bensch, O. Hellgren
202019 citations
Semantic Scholar
Seasonal variations of intensity of avian malaria infection in the Thousand Island Lake System, China
Yuxiao Han, O. Hellgren, Qiang Wu, Juan Liu +3 more
2023Parasites & Vectors17 citations Open access
Semantic Scholar
Molecular identification of the chitinase genes in Plasmodium relictum
L. Garcia-Longoria, O. Hellgren, S. Bensch
2014Malaria Journal16 citations Open access
Semantic Scholar
Allelic variation at innate immune genes (avian beta-defensins), within a natural population of great tits
O. Hellgren
201515 citations
Semantic Scholar
Population genetic structure, differentiation, and diversity in Tetrix subulata pygmy grasshoppers: roles of population size and immigration
Jon Tinnert, O. Hellgren, Jenny Lindberg, Per Koch‐Schmidt +1 more
2016Ecology and Evolution14 citations Open access
Semantic Scholar

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