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  • 1
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    Psammogammarus stocki n. sp. (Crustacea, Amphipoda, Melitidae) from beach interstitia on Tenerife. Stygofauna of the Canary Islands, 21 (1990)
    In:  Bijdragen tot de dierkunde vol. 60 no. 3/4, pp. 271-276
    Details
    Publication Date: 2024-01-12
    Description: A description is given of Psammogammarus stocki n. sp. from the interstitial of loose sediments in heavily exposed rockpools in the mediolittoral zone of Tenerife, Canary Islands. The species apparently represents the ultimate apomorphous condition within the genus and co-occurs with Psammogammarus initialis Stock & S\xc3\xa1nchez, 1987, a species that exhibits more primitive features.
    Keywords: Amphipoda ; Melitidae ; marine stygobiont ; Tenerife ; Psammogammarus ; taxonomy
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 2
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    Sex ratio and sexual selection in wormshrimps (Crustacea, Amphipoda, Ingolfiellidea) (2006)
    In:  Contributions to Zoology vol. 75, 3/4, pp. 189-194
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    Publication Date: 2024-01-12
    Description: 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 characters were not correlated, nor did these characters correlate with the amount of sexual dimorphism. It remains unknown why so many ingolfiellids have evolved these costly features.
    Keywords: arthropod sex ratio ; socio-ecology ; groundwater amphipods
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 3
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    Biological groundwater studies in Ascension Island (South Atlantic), October \xe2\x80\x94 November 1989 (1989)
    In:  Verslagen en Technische Gegevens vol. 56 no. 1, pp. 1-10
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    Publication Date: 2024-01-12
    Description: Ascension Island (08\xc2\xb0 S 14\xc2\xb025\xe2\x80\x99 W) occupies a very peculiar place in our current research project on the biological properties of ground waters of the the Mid-Atlantic islands: -- The island lies closer to the equator than any of the other Mid-Atlantic islands. -- The island lies almost on the Mid-Atlantic Ridge, and far remote from any other insular or continental region. -- The island\xe2\x80\x99s subaerial part consists of very young volcanic outcrops (dated radiometrically at 1-2 My).\nThrough these properties, the comparison of Ascension with the intensively studied Canary Islands (see the series of publications of our team under the collective title \xe2\x80\x9cStygofauna of the Canary Islands\xe2\x80\x9d, parts 1 to 19) is of great importance for a better understanding of dispersal and/or vicariant processes in the evolution of insular groundwater organisms (or stygobionts as these are called scientifically).
    Repository Name: National Museum of Natural History, Netherlands
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  • 4
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    Limnic and brackish water Amphipoda (Crustacea) from Iran (1998)
    In:  Beaufortia vol. 48 no. 9, pp. 173-234
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    Publication Date: 2024-01-12
    Description: 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.
    Keywords: Iran ; Amphipoda ; new species ; Obesogammarus ; Gammarus ; Derzhavinella ; Scytaelina n. gen
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 5
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    Microcerberus insularis n.sp. (Crustacea, Isopoda, Aselloidea), a marine interstitial species from Tenerife Stygofauna of the Canary Islands, 24 (1992)
    In:  Bulletin Zoologisch Museum vol. 13 no. 9, pp. 85-88
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    Publication Date: 2024-01-12
    Description: Microcerberus insularis n. sp., a marine stygobiont of beaches on Tenerife, Canary Islands, is described. It belongs to the remanei-group and resembles in many aspects M. renaudi from the Bahamas.
    Keywords: Isopoda ; Microcerberidae ; marine stygobiont ; Tenerife
    Repository Name: National Museum of Natural History, Netherlands
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  • 6
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    ExcaliBAR: a simple and fast software utility to calculate intra- and interspecific distances from DNA barcodes (2014)
    In:  Contributions to Zoology vol. 83 no. 1, pp. 79-83
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    Publication Date: 2024-01-12
    Description: 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 specific scripts for this purpose.
    Keywords: bioinformatics ; DNA Barcoding ; pairwise genetic distance ; sequence renaming
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 7
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    Marine interstitial Amphipoda and Isopoda (Crustacea) from Santiago, Cape Verde Islands (1992)
    In:  Bijdragen tot de dierkunde vol. 62 no. 1, pp. 21-36
    Details
    Publication Date: 2024-01-12
    Description: Three species of Amphipoda are recorded from interstices of a marine beach on the island of Santiago, Cape Verde Archipelago: Cabogidiella littoralis n. gen., n. sp. (Bogidiellidae), Psammogammarus spinosus n. sp. (Melitidae), and Idunella sketi Karaman, 1980 (Liljeborgiidae). The latter, widely distributed species (West Indies, Canary Islands), is new to the Cape Verde Islands. Furthermore, an isopod is described from the same locality, Caecostenetroides mixtum n. sp. (Gnathostenetroididae).
    Keywords: Amphipoda ; Isopoda ; interstitial ; Cape Verde Islands
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 8
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    Editorial Jan Hendrik Stock 22 February 1931 \xe2\x80\x93 17 February 1997 (1997)
    In:  Contributions to Zoology vol. 67 no. 1, pp. 3-7
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    Publication Date: 2024-01-12
    Description: Jan Stock was born in western Amsterdam 22 February 1931, the only child of Jan Hendrik Stock, a bank clerk, and Elisabeth Stock-Knevel. He exhibited an early interest as a child in living things, raising plants on a back balcony of his parents apartment and collecting animals during family excursions to the beaches at Zandvoort. However, it was in his early teens in the Hoogere Burgerschool that his interest in biology blossomed where he achieved perfect scores in natural history on his final examinations. He entered the University of Amsterdam in 1948 to pursue his studies of biology and worked under such figures as Profs. L.F. de Beaufort and H. Engel \xe2\x80\x93 his predecessors in the chair of Special Zoology \xe2\x80\x93 as well as Profs. J.E.W. Ihle and E.J. Slijper. It was Ihle in fact who first encouraged Stock to take up the study of pycnogonids, the sea spiders, a group in which he made some of his initial scientific contributions.\nHis first scientific articles date from the student years and appeared in Het Zeepaard, the journal of the beach research groups of the Dutch Youth-Union for Nature Studies and the Dutch Natural History Society. These attracted him to the attention of De Beaufort who gave him a job as a curatorial assistant in the Zoological Museum of Amsterdam in 1950 with duties in the then poorly organized collections of marine invertebrates. He set up a card catalogue of the collections, tracked loans of museum materials to other researchers, and identified specimens for members of the public. It was through this last activity, when he received from the National Fisheries Institute (then at Bergen-op-Zoom in the Dutch province of Noord-Brabant) some parasitic copepods afflicting mollusks, that Stock developed another of his research interests, the taxonomy of copepods. His first real scientific papers date from that year.
    Repository Name: National Museum of Natural History, Netherlands
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  • 9
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    Effect of introduced species and habitat alteration on the occurrence and distribution of euryhaline fishes in fresh- and brackish-water habitats on Aruba, Bonaire and Cura\xc3\xa7ao (South Caribbean) (2008)
    In:  Contributions to Zoology vol. 77 no. 1, pp. 45-52
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    Publication Date: 2024-01-12
    Description: We conducted an ichthyological survey during the dry season of 2006 on the semi-arid islands of Aruba, Bonaire and Cura\xc3\xa7ao to provide information on species composition, richness and distribution in natural and non-natural aquatic habitats. The dry season species assemblages (N = 9 species) comprised less species than the wet seasons, and these data refine our knowledge of the indigenous fish fauna and its refuge localities during phases of drought and ensuing high salinity. A hierarchical cluster analysis reveals that the three islands have different species compositions with Cura\xc3\xa7ao being the most diverse, probably due to its having the most habitats and freshwaters present throughout the year. Species richness was unrelated to salinity and species diversity was highest in canalised streams. In the dry season fewer amphidromous species are present than in the wet season. We found no significant effect of human-induced changes on the presence or absence of fish species in the Netherlands Antilles. The presence of exotic species (including Xiphophorus helleri on Aruba, a first record for this island, and Oreochromis mossambicus and Poecilia reticulata occurring on all three islands) did not have a clear effect on the presence of indigenous species, nor did human alteration of the habitats have an influence on the occurrence of fish species.
    Keywords: fish assemblages ; semi-arid islands ; intermittent rivers ; aquatic refugia ; ecological integrity
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 10
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    Blurring the picture: introductions, invasions, extinctions \xe2\x80\x93 biogeography in a global world (2008)
    In:  Contributions to Zoology vol. 77 no. 2, pp. 67-70
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    Publication Date: 2024-01-12
    Description: 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 \xe2\x80\x98Biogeography: explaining and predicting species distributions in space and time\xe2\x80\x99 held in Amsterdam in 2007, and the resulting papers as published in this special issue, including papers on crustaceans, birds and mammals.
    Keywords: extinction ; globalization ; invasions ; reintroductions ; zoogeography
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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