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  • 1
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    Drastic changes in the amphipod fauna (Crustacea) of Dutch inland waters during the last 25 years (1992)
    In:  Bijdragen tot de dierkunde vol. 61 no. 4, pp. 193-204
    Details
    Publication Date: 2024-01-12
    Description: After the introduction of Gammarus tigrinus in The Netherlands some 25 years ago and of other recently invading amphipods (Crangonyx pseudogracilis and Corophium curvispinum) the native species decreased, the invaders increased. The success of these invaders and its impact on the local amphipod fauna is discussed. Electrophoretic tests give evidence that a second invasion of Gammarus tigrinus, this time from Germany, is taking place. Some predictions about future developments are made.
    Keywords: Netherlands ; amphipods ; changing distributions ; allozyme electrophoresis ; introduced species ; environmental changes
    Repository Name: National Museum of Natural History, Netherlands
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  • 2
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    Amsterdam Expeditions to the West Indian Islands, Report 20. The genus Heterocypris (Crustacea, Ostracoda) in the West Indies. Part I. Taxonomic characters (1982)
    In:  Bijdragen tot de dierkunde vol. 52 no. 2, pp. 207-227
    Details
    Publication Date: 2024-01-12
    Description: A redescription is provided of Heterocypris margaritae Margalef, 1961 (= H. similis Klie, 1933). H. antillensis n. sp., a species closely related to H. margaritae, is described. Taxonomic remarks are made on H. punctata Keyser, 1975, a species from Florida, which also inhabits part of the Caribbean islands and is related to both other species.\nDescriptions of chaetotaxy were made according to the system of Broodbakker & Danielopol (1982) and form an example of the use of this system.\nCarapace length seems to be a very variable character in this genus and must be used as a taxonomic character with great caution. The structure of the hemipenis seems to be a very valuable taxonomic character, as are the furca and maxillular palp and to a lesser degree the male maxilla. The form of the carapace seems to be quite characteristic of each species, but is more difficult to define and compare when material for comparison is not at hand and other characters are not provided.
    Repository Name: National Museum of Natural History, Netherlands
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  • 3
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    Amsterdam Expeditions to the West Indian Islands, Report 25. The genus Hemicypris (Crustacea, Ostracoda) in the West Indies (1983)
    In:  Bijdragen tot de dierkunde vol. 53 no. 1, pp. 135-157
    Details
    Publication Date: 2024-01-12
    Description: A worldwide list of species that have to be assigned to the genus Hemicypris is given. H. exigua n. sp. and H. barbadensis n. sp. are described. A redescription is given of H. reticulata (Klie, 1930), a species from Paraguay, which was also encountered in the Antillean islands. Descriptions of chaetotaxy are made according to the system of Broodbakker & Danielopol (1982). The morphology of the limbs of the three species is similar to that of the species of the genus Heterocypris encountered in the West Indies.\nLike in the genus Heterocypris, a considerable amount of variation in mean carapace length is found. The relative length of some setae seems to be fairly constant within, and characteristic of, each species.\nSome remarks are made on the ecology and the zoogeography of the three species.
    Repository Name: National Museum of Natural History, Netherlands
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  • 4
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    The chaetotaxy of Cypridacea (Crustacea, Ostrocoda) limbs: proposals for a descriptive model (1982)
    In:  Bijdragen tot de dierkunde vol. 52 no. 2, pp. 103-120
    Details
    Publication Date: 2024-01-12
    Description: The need for better and more systematic descriptions of the chaetotaxy (especially data concerning the shape, structure and pattern of distribution of the setae) is emphasized. The historical developments of studies in chaetotaxy are reviewed.\nTwo basic types of cuticular processes can be recognized: setae and pseudochaetae. The former have sensorial and mechanical functions, the latter only a mechanical function. A special type of seta is the aesthetasc or the chemosensorial receptor. Using the shape and structure of the setae, most of them can be classified in the following categories: simple, plumed, serrate and chelate.\nThe importance of developmental studies for the establishment of homologies in chaetotaxy is stressed.\nExamples of functional morphology of setae are discussed. It is emphasized that the functional morphology of most of the setae can be better understood when the whole organ is studied of which the setae are only a component. Not all the setae have an adaptive significance.\nA descriptive model of the chaetotaxy of cypridacean ostracods is presented. The different characteristics of the setae as well as their position on the limbs are coded by letters and numerals using simple formulae.
    Repository Name: National Museum of Natural History, Netherlands
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  • 5
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    Collection of Groundwater and Freshwater Fauna on the Islands of the South Pacific. Operation Raleigh -- Pacific Crossing (1988)
    In:  Verslagen en Technische Gegevens vol. 54 no. 1, pp. 1-31
    Details
    Publication Date: 2024-01-12
    Description: During this project about 150 groundwater habitats were sampled on a number of islands in the South Pacific. The main habitats sampled were: wells, springs, caves, beaches and streams.\nGroundwater fauna was only found on two islands. On Easter Island we found a new species belonging to the Isopoda (Crustacea), living in marine groundwater interstitia. On Tongatapu a new species of groundwater Amphipoda (Crustacea) was found in Anahulu Cave. Fragments which possibly belong to the same species were found in some wells on the island.\nMany samples have not yet been sorted out. Therefore it is possible that more groundwater species will be found, particularly in the beach samples from the Cook Islands, and in the spring, cave, well, and beach samples of the Samoa\xe2\x80\x99s.\nThe absence of groundwater fauna on most volcanic islands was expected, but the lack of groundwater fauna on the uplifted coral islands, such as the outer Cooks, was surprising. Tongatapu and the other Tongan islands seem to be more promising as far as groundwater fauna is concerned.\nAs a side-study many freshwater shrimps have been collected on the Cook Islands and the Samoa\xe2\x80\x99s.\nOn Robinson Crusoe Island, Henderson, Pitcairn, Atiu, and \xe2\x80\x99Eua, terrestrial Amphipoda belonging to the family Talitridae (sandhoppers or beach fleas) have been found.
    Repository Name: National Museum of Natural History, Netherlands
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  • 6
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    Ecology and Distribution of Groundwater Crustacea and Freshwater Ostracoda in SW Honshu and the Nansei Islands, Japan. I Groundwater Crustacea & List of Stations (1988)
    In:  Verslagen en Technische Gegevens vol. 53 no. 1, pp. 1-21
    Details
    Publication Date: 2024-01-12
    Description: This project was originally planned to take place in the summer of 1985. Due to unforeseen circumstances it could not in fact be carried out until the autumn of 1986. This meant that some aspects of the project had to be changed because of seasonal influences.\nOne major drawback was the absence of any flooded rice fields, because the fieldwork was done after the growing and harvesting of the rice. It was therefore impossible to collect any ostracods from ricefields in south west Honshu. Since the rice fields are one of the major ostracod habitats in Japan, this meant a dramatic decrease of the number of possible collecting sites.
    Repository Name: National Museum of Natural History, Netherlands
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  • 7
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    Onderzoek naar de macrofauna van de \xe2\x80\x9cVereenigde Harger en Pettemerpolder\xe2\x80\x9d (een brakwatergebied in Noord-Holland) (1980)
    In:  Verslagen en Technische Gegevens vol. 26 no. 1, pp. 1-45
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    Publication Date: 2024-01-12
    Description: 11. Samenvatting In de \xe2\x80\x9cVereenigde Harger en Pettemerpolder\xe2\x80\x9d, een brakwatergebied achter de Hondsbossche Zeewering in Noord-Holland, werd een macrofauna-inventarisatie op 20 punten verricht. Dit mede om de representativiteit van de 5 monsterpunten van Provinciale Waterstaat Noord-Holland in dit gebied te kunnen toetsen. Door middel van cluster-analyse konden de monsterpunten worden opgesplitst in vier groepen, met specifieke macrofauna-combinaties. Belangrijke grenzen werden gevonden bij 0,25 g Cl/l gem., ergens tussen de 0,7 en de 1,0 g Cl-/l gem., en bij 2,5 g Cl-/l gem.. De specifieke hierbij behorende soortencombinaties zijn weergegeven in bijlage V De clustering bleek in hoge mate gecorreleerd te zijn aan het zoutgehalte. De saprobiegraad voor de zoetere punten, berekend volgens Pantle & Buck met indicatorwaarden van Sladecek, ligt voor de meeste punten in het bovenste gedeelte van het \xce\xb2 \xe2\x80\x93 mesosaprobe gebied. Fysisch-chemisch gezien is het water polytroof, mede door de voedselrijke zoute kwel.\nVoor de meest voorkomende soorten werd de zoutgehalte-range bepaald, en de seizoensinvloeden bekeken.\nDe monsterpunten van Provinciale Waterstaat Noord-Holland geven bekeken vanuit de gestelde doelstelling een redelijk beeld van de variaties in dit gebied. Voor een gedetailleerd beeld van de macrofaunagemeenschappen is het aantal monsterpunten van Provinciale Waterstaat ta klein, hiervoor zou dan ook in de herfst gemonsterd moeten worden. Over het algemeen werden minder soorten en kleinere aantallen gevonden.
    Repository Name: National Museum of Natural History, Netherlands
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  • 8
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    Vergelijkend onderzoek naar de macrofauna van de Polder Schagen (N-H) (1981)
    In:  Verslagen en Technische Gegevens vol. 29 no. 1, pp. 1-23
    Details
    Publication Date: 2024-01-12
    Description: Het onderzoek werd uitgevoerd in de Polder Schagen, een polder in Noord-Holland, ten zuiden van de stad Schagen ( Topogr.krt 14 D; bijlage I A) . Doelstelling van het onderzoek was om door middel van een ""fijnmazige"" macrofaunabemonstering te toetsen of de globale bemonstering zoals die in het kader van de provinciale milieu\xc3\xafnventarisatie door de Provinciale Waterstaat van Noord-Holland in dit gebied werd uitgevoerd, voldoende representatief is. Uit de resultaten van een dergelijk onderzoek in de ""Vereenigde Harger & Pettemerpolder (Noord-Holland), bleek namelijk dat de globale monstername van Provinciale Waterstaat in dat gebied minder soorten en kleinere aantallen opleverde (Broodbakker & Coosen, 1981). Vanwege de gecompliceerde hydrologie van deze polder (zoutgehalte-gradi\xc3\xabnten) was dit verschil verklaarbaar. Om te toetsen of in een polder waarvan de hydrologie eenvoudiger is, de monstername van Provinciale Waterstaat meer representatief is, werd de ""Polder Schagen"" in onderling overleg als onderzoeksgebied gekozen. In deze polder werden door de sectie hydrobiologie van de Provinciale Waterstaat vijf punten op macrofauna bemonsterd. Ter vergelijking werden voor dit onderzzoek vijftien gevari\xc3\xaberde punten op macrofauna bemonsterd. Alle genoemde punten zijn aangegeven in bijlage 1.\nIn dit rapport zal getracht worden om het voorkomen van bepaalde macrofaunalevensgemeenschappen met behulp van clusteranalyse te registreren en met rangcorrelatietoetsen te relateren aan fysisch-chemische factoren. Tevens zullen de resultaten met de literatuur vergeleken worden.
    Repository Name: National Museum of Natural History, Netherlands
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  • 9
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    Amsterdam Expeditions to the West Indian Islands, Report 37. The genus Tanycypris (Crustacea, Ostracoda) in the West Indies (1984)
    In:  Bijdragen tot de dierkunde vol. 54 no. 1, pp. 15-24
    Details
    Publication Date: 2024-01-12
    Description: A list of species that are, or probably have to be, assigned to the genus Tanycypris is given. A redescription is given of T. meridana (Furtos, 1936), a species originally described as Herpetocypris, from Yucatan (Mexico). This species was also found in Puerto Rico, two of the Lesser Antilles and two islands off the Venezuelan coast. The species is compared with other species of Tanycypris, with species of the subgenus Acanthocypris of Strandesia s.l., as defined by Broodbakker (1983), and especially with Strandesia venezolana Broodbakker, 1983, which seems to be intermediate between Tanycypris and Acanthocypris. Furthermore, a supplementary diagnosis of the genus Tanycypris is given. Tanycypris appears to be a widespread tropical genus, represented by few species with an extensive distribution.
    Repository Name: National Museum of Natural History, Netherlands
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  • 10
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    Amsterdam Expeditions to the West Indian Islands, Report 36. The genus Strandesia and other Cypricercini (Crustacea, Ostracoda) in the West Indies. Part II. Carapace length, ecology, and distribution of two Strandesia species (1984)
    In:  Bijdragen tot de dierkunde vol. 54 no. 1, pp. 1-8
    Details
    Publication Date: 2024-01-12
    Description: The distribution and ecology of two species of Strandesia, s. longula Broodbakker, 1983, and S. stocki Broodbakker, 1983, are discussed. Both species are very common in Haiti, and S. longula is also common in the Bahamas. Both are found on some of the Lesser Antilles, and therefore they are assumed to have a much wider distribution.\nThe two species are mostly found in fresh water, but they can tolerate chlorinities up to 3500 mg/l. No preferences concerning other factors could be found. Both species live in wells, pools, and in the underflow of running waters.\nDifferences in carapace length of different populations could not be correlated with any environmental factor measured. These length differences do not appear to be determined genetically. It is most probable that differences in carapace length are caused by combined environmental factors, like food abundance, pollution, and factors of water chemistry other than chlorinity, as postulated for the genera Heterocypris and Hemicypris.
    Repository Name: National Museum of Natural History, Netherlands
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