Species delimitation in northern European water scavenger beetles of the genus Hydrobius (Coleoptera, Hydrophilidae)
The chiefly Holarctic Hydrobius species complex (Coleoptera, Hydrophilidae) currently consists of H. arcticus Kuwert, 1890, and three morphological variants of H. fuscipes (Linnaeus, 1758): var. fuscipes, var. rottenbergii and var. subrotundus in northern Europe. Here molecular and morphological dat...
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ftpensoft:10.3897/zookeys.564.6558 2023-05-15T16:12:18+02:00 Species delimitation in northern European water scavenger beetles of the genus Hydrobius (Coleoptera, Hydrophilidae) Fossen,Erlend Ekrem,Torbjørn Nilsson,Anders Bergsten,Johannes 2016 text/html https://doi.org/10.3897/zookeys.564.6558 https://zookeys.pensoft.net/article/6558/ en eng Pensoft Publishers info:eu-repo/semantics/altIdentifier/eissn/1313-2970 info:eu-repo/semantics/altIdentifier/pissn/1313-2989 info:eu-repo/semantics/openAccess ZooKeys 564: 71-120 GMYC species complex BPP guide tree Fennoscandia morphometrics Bayesian genitalia molecular phylogeny species boundaries morphology cryptic species integrative taxonomy DNA barcoding identification key taxonomy checklist Monograph 2016 ftpensoft https://doi.org/10.3897/zookeys.564.6558 2022-03-01T12:32:08Z The chiefly Holarctic Hydrobius species complex (Coleoptera, Hydrophilidae) currently consists of H. arcticus Kuwert, 1890, and three morphological variants of H. fuscipes (Linnaeus, 1758): var. fuscipes, var. rottenbergii and var. subrotundus in northern Europe. Here molecular and morphological data are used to test the species boundaries in this species complex. Three gene segments (COI, H3 and ITS2) were sequenced and analyzed with Bayesian methods to infer phylogenetic relationships. The Generalized Mixed Yule Coalescent (GMYC) model and two versions of the Bayesian species delimitation method BPP, with or without an a priori defined guide tree (v2.2 & v3.0), were used to evaluate species limits. External and male genital characters of primarily Fennoscandian specimens were measured and statistically analyzed to test for significant differences in quantitative morphological characters. The four morphotypes formed separate genetic clusters on gene trees and were delimited as separate species by GMYC and by both versions of BPP, despite specimens of H. f. var. fuscipes and H. f. var. subrotundus being sympatric. H. arcticus and H. f. var. rottenbergii could only be separated genetically with ITS2, and were delimited statistically with GMYC on ITS2 and with BPP on the combined data. In addition, six or seven potentially cryptic species of the H. fuscipes complex from regions outside northern Europe were delimited genetically. Although some overlap was found, the mean values of six male genital characters were significantly different between the morphotypes (p < 0.001). Morphological characters previously presumed to be diagnostic were less reliable to separate H. f. var. fuscipes from H. f. var. subrotundus, but characters in the literature for H. arcticus and H. f. var. rottenbergii were diagnostic. Overall, morphological and molecular evidence strongly suggest that H. arcticus and the three morphological variants of H. fuscipes are separate species and Hydrobius rottenbergii Gerhardt, 1872, stat. n. and Hydrobius subrotundus Stephens, 1829, stat. n. are elevated to valid species. An identification key to northern European species of Hydrobius is provided. Book Fennoscandia Fennoscandian Pensoft Publishers ZooKeys 564 71 120 |
institution |
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collection |
Pensoft Publishers |
op_collection_id |
ftpensoft |
language |
English |
topic |
GMYC species complex BPP guide tree Fennoscandia morphometrics Bayesian genitalia molecular phylogeny species boundaries morphology cryptic species integrative taxonomy DNA barcoding identification key taxonomy checklist |
spellingShingle |
GMYC species complex BPP guide tree Fennoscandia morphometrics Bayesian genitalia molecular phylogeny species boundaries morphology cryptic species integrative taxonomy DNA barcoding identification key taxonomy checklist Fossen,Erlend Ekrem,Torbjørn Nilsson,Anders Bergsten,Johannes Species delimitation in northern European water scavenger beetles of the genus Hydrobius (Coleoptera, Hydrophilidae) |
topic_facet |
GMYC species complex BPP guide tree Fennoscandia morphometrics Bayesian genitalia molecular phylogeny species boundaries morphology cryptic species integrative taxonomy DNA barcoding identification key taxonomy checklist |
description |
The chiefly Holarctic Hydrobius species complex (Coleoptera, Hydrophilidae) currently consists of H. arcticus Kuwert, 1890, and three morphological variants of H. fuscipes (Linnaeus, 1758): var. fuscipes, var. rottenbergii and var. subrotundus in northern Europe. Here molecular and morphological data are used to test the species boundaries in this species complex. Three gene segments (COI, H3 and ITS2) were sequenced and analyzed with Bayesian methods to infer phylogenetic relationships. The Generalized Mixed Yule Coalescent (GMYC) model and two versions of the Bayesian species delimitation method BPP, with or without an a priori defined guide tree (v2.2 & v3.0), were used to evaluate species limits. External and male genital characters of primarily Fennoscandian specimens were measured and statistically analyzed to test for significant differences in quantitative morphological characters. The four morphotypes formed separate genetic clusters on gene trees and were delimited as separate species by GMYC and by both versions of BPP, despite specimens of H. f. var. fuscipes and H. f. var. subrotundus being sympatric. H. arcticus and H. f. var. rottenbergii could only be separated genetically with ITS2, and were delimited statistically with GMYC on ITS2 and with BPP on the combined data. In addition, six or seven potentially cryptic species of the H. fuscipes complex from regions outside northern Europe were delimited genetically. Although some overlap was found, the mean values of six male genital characters were significantly different between the morphotypes (p < 0.001). Morphological characters previously presumed to be diagnostic were less reliable to separate H. f. var. fuscipes from H. f. var. subrotundus, but characters in the literature for H. arcticus and H. f. var. rottenbergii were diagnostic. Overall, morphological and molecular evidence strongly suggest that H. arcticus and the three morphological variants of H. fuscipes are separate species and Hydrobius rottenbergii Gerhardt, 1872, stat. n. and Hydrobius subrotundus Stephens, 1829, stat. n. are elevated to valid species. An identification key to northern European species of Hydrobius is provided. |
format |
Book |
author |
Fossen,Erlend Ekrem,Torbjørn Nilsson,Anders Bergsten,Johannes |
author_facet |
Fossen,Erlend Ekrem,Torbjørn Nilsson,Anders Bergsten,Johannes |
author_sort |
Fossen,Erlend |
title |
Species delimitation in northern European water scavenger beetles of the genus Hydrobius (Coleoptera, Hydrophilidae) |
title_short |
Species delimitation in northern European water scavenger beetles of the genus Hydrobius (Coleoptera, Hydrophilidae) |
title_full |
Species delimitation in northern European water scavenger beetles of the genus Hydrobius (Coleoptera, Hydrophilidae) |
title_fullStr |
Species delimitation in northern European water scavenger beetles of the genus Hydrobius (Coleoptera, Hydrophilidae) |
title_full_unstemmed |
Species delimitation in northern European water scavenger beetles of the genus Hydrobius (Coleoptera, Hydrophilidae) |
title_sort |
species delimitation in northern european water scavenger beetles of the genus hydrobius (coleoptera, hydrophilidae) |
publisher |
Pensoft Publishers |
publishDate |
2016 |
url |
https://doi.org/10.3897/zookeys.564.6558 https://zookeys.pensoft.net/article/6558/ |
genre |
Fennoscandia Fennoscandian |
genre_facet |
Fennoscandia Fennoscandian |
op_source |
ZooKeys 564: 71-120 |
op_relation |
info:eu-repo/semantics/altIdentifier/eissn/1313-2970 info:eu-repo/semantics/altIdentifier/pissn/1313-2989 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3897/zookeys.564.6558 |
container_title |
ZooKeys |
container_volume |
564 |
container_start_page |
71 |
op_container_end_page |
120 |
_version_ |
1765997580365332480 |