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| Vonk, R.; Nijman, V.. |
| Small populations of several species of the groundwater dwelling amphipod genus Ingolfiella are found in caves, wells, seabottoms, beaches and riverbed interstitial habitats. To gain insight in the socio-ecology of these elusive species, we used data from collected specimens to explore the relationships between sexratios, display of secondary sexual characters and other morphological features, and habitat use. We extracted data on the sex ratios and the presence-absence of secondary sexual characters of 13 species from the literature and through examination of museum material. We found a clearly skewed sex ratio with a preponderance of females, both in the individual species as in the genus as a whole. However, sex ratio and the display of secondary sexual... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Arthropod sex ratio; Socio-ecology; Groundwater amphipods; 42.74. |
| Ano: 2006 |
URL: http://www.repository.naturalis.nl/record/214565 |
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| Nijman, V.; Vonk, R.. |
| Global biogeography and phylogeography have gained importance as research topics in zoology, as attested by the steady increase in the number of journals devoted to this topic and the number of papers published. Yet, in a globalising world, with species reintroductions, invasions of alien species, and large-scale extinctions, unravelling the true biogeographic relationships between areas and species may become increasingly difficult. We present an introduction to the symposium ‘Biogeography: explaining and predicting species distributions in space and time’ held in Amsterdam in 2007, and the resulting papers as published in this special issue, including papers on crustaceans, birds and mammals. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Extinction; Globalization; Invasions; Reintroductions; Zoogeography; 42.65. |
| Ano: 2008 |
URL: http://www.repository.naturalis.nl/record/280455 |
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| Aliabadian, M.; Nijman, V.; Mahmoudi, A.; Naderi, M.; Vonk, R.; Vences, M.. |
| In the context of DNA Barcoding, sequences of standard marker genes for thousands and potentially millions of individuals and species are becoming available, requiring ever more efficient bioinformatic environments and software algorithms for analysis. We here present ExcaliBAR (Extraction, Calculation, Barcoding), a user-friendly software utility to facilitate one important initial step in DNA barcoding analyses, namely the determination of the barcoding gap between pairwise genetic distances among and within species, based on original distance matrices computed by MEGA software. In addition, the software is able to rename sequences downloaded via the standard user interfaces of public databases such as GenBank, without the need of developing and applying... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Bioinformatics DNA Barcoding pairwise genetic distance sequence renaming 35.73 42; 20 54.50. |
| Ano: 2014 |
URL: http://www.repository.naturalis.nl/record/474212 |
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| Stock, J.H.; Mirzajani, A.R.; Vonk, R.; Naderi, S.; Kiabi, B.H.. |
| Records of 185 amphipod samples taken in Iran, both in the brackish Caspian Sea and in fresh waters belonging to the Caspian drainage system and the Central Basin. Twenty-nine species are represented (25 Gammaridae, 1 Pontoporeiidae, 1 Gammaracanthidae, 2 Corophiidae), of which 1 species of Obesogammarus, and 6 species of Gammarus (all from inland waters), 1 species of the new genus Scytaelina, and 1 species of Derzhavinella (both from the brackish Caspian Sea) are new to science, Obesogammarus turcarum, Gammarus imberbus, and G. syriacus are new to Iranian continental waters, whereas Gammarus aequicauda and Pontogammarus borceae are new to the Caspian Sea. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Iran; Amphipoda; New species; Obesogammarus; Gammarus; Derzhavinella; Scytaelina n. gen. |
| Ano: 1998 |
URL: http://www.repository.naturalis.nl/record/504949 |
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| Vonk, R.; Nijman, V.. |
| We provide a brief overview of the history of the journal Contributions to Zoology and analyse the papers published in the last 27 years by topic. Founded in 1848 as ‘Bijdragen tot de Dierkunde’, 160 years and 76 volumes later it is one of the oldest zoological journals that is still regularly printed. Over the last decades most papers dealt with invertebrates (60%), followed by vertebrates (23%), insects (10%) and non-taxonomic papers. Contributions to Zoology has seen a change from a largely alpha taxonomic journal to one that is truly general in scope. Systematic Biology and Comparative Morphology of both extant and extinct taxa nowadays make up about half of the papers published. Ethology as a research subject has been gradually phased out, and judged... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Bibliographic analysis; Biological research trends; 42.01. |
| Ano: 2007 |
URL: http://www.repository.naturalis.nl/record/262650 |
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