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| Registros recuperados: 22 | |
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| Kelleher, B.; Velde, G. van der; Wittmann, K.J.; Faasse, M.A.; Vaate, A. bij de. |
| The freshwater Mysidacea of The Netherlands are presently composed of three species. The indigenous mysid, Neomysis integer (Leach, 1814) has recently been joined by two Pontocaspian species, Limnomysis benedeni Czerniavsky, 1882 and Hemimysis anomala G.O. Sars, 1907. All three species now coexist in the Dutch Rhine. The present paper deals with the first records of L. benedeni in The Netherlands with ecological notes on the three species. |
| Tipo: Article / Letter to the editor |
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| Ano: 1999 |
URL: http://www.repository.naturalis.nl/record/505416 |
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| Velde, G. van der; Polderman, P.J.G.. |
| Reeds enkele auteurs (Schrieken & Swennen, 1969; Vaas, 1970) hebben het voorkomen van Atherina mochon in Nederland geconstateerd. Zij vermeldden de soort uit het Veerse Meer, waar deze al in 1964 werd gevangen. Geen van deze auteurs gaat echter in op de vraag, hoe deze soort waarvan de verspreiding in hoofdzaak Mediterraan is, in het Veerse Meer gekomen is. Tijdens bezoeken aan de binnenhaven van Vlissingen, waar de electriciteitscentrale (PZEM) zijn brakke koelwater loost, bleken grote scholen van Atherina mochon aanwezig te zijn naast scholen van de gewone koornaarvis, Atherina presbyter Valenciennes, 1835. Het volgende materiaal dat in de binnenhaven verzameld werd, kon onderzocht worden: A. presbyter, 1 ex., standaardlengte 54 mm (13 december... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.81. |
| Ano: 1972 |
URL: http://www.repository.naturalis.nl/record/317205 |
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| Giesen, Th.G.; Velde, G. van der. |
| An investigation has been made on the distribution of Nymphaea alba and N. Candida in the Netherlands. During 1977 7 new localities of N. Candida were discovered, while from three other localities material was present in the Rijksherbarium Leiden, so that now 11 localities of the species are known. The distribution in the Netherlands seems to be discontinuous and is restricted to a part of the Fluviatile district and the borders of the Drenthian district, in the northern part of the country (fig. 1). The discovery of the species by TÜXEN (1955) in Niedersachsen may indicate, that the species can be expected to occur in more localities in northwestern Germany, connecting the northern localities in the Netherlands with those of the main area in eastern... |
| Tipo: Article / Letter to the editor |
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| Ano: 1978 |
URL: http://www.repository.naturalis.nl/record/527532 |
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| Berge - Henegouwen, A.L. van; Velde, G. van der. |
| INLEIDING De Kagerplassen, gelegen bij Warmond ten noorden van Leiden, bestaan uit een aantal met elkaar verbonden plassen, doorvaarten en boezemwateren (fig. 1). Deze plassen zijn een restant van de Haarlemmermeer, welke in 1852 werd drooggelegd. Zij dienen als boezemwateren voor het Rijnland. De wateraanvoer gaat via de inlaat van de Hollandse IJssel bij Gouda door de Rijpweteringse vaart, de Zijp en de Zijl en in mindere mate via de Haarlemmermeerringvaart ten oosten van het gemaal Leeghwater. De afvoer van dit water met een tamelijk laag chloridegehalte, maar met een hoog gehalte aan organisch materiaal, gaat via de uitlaat bij Katwijk en voor een klein deel via het gemaal bij Spaarndam, dus voornamelijk via Spriet en Laeck — Warmonder Leede en soms... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.65. |
| Ano: 1975 |
URL: http://www.repository.naturalis.nl/record/317244 |
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| Nieukerken, E.J. van; Velde, G. van der. |
| A hydrobiological description of eight ditches in the Dutch inland polders "Oude Land van Strijen" and "St.-Anthoniepolder" (province of South-Holland) is given. The flora and macrofauna (table 2 and 3) have been studied in July and October 1971. A few chemical data (chloride-content and conductivity) of the water are presented. In the northern part of the area the percolating water is fresh due to the influence of the "Binnenbedijkte Maas", one of the few real freshwater lakes of the Deltaic region. In the southern part it is brackish due to the influence of the „Hollands Diep". The bottomprofile of the polders shows heavy river-clay poor in chalk (upper 40-100 cm) on peat. The examined ditches are hardly polluted and the water is clear. On the bottom of... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Inventarisatie; Oude Land van Strijen; St. Anthoniepolder; Sloten; Flora en fauna; 42.92. |
| Ano: 1973 |
URL: http://www.repository.naturalis.nl/record/303571 |
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| Kelleher, B.; Vaate, A. bij de; Swarte, M.; Klink, A.G.; Velde, G. van der. |
| The Ponto-Caspian isopod, Jaera istri Veuille, 1979, an endemic species of the river Danube, invaded the lower river Rhine in 1997. This paper provides notes on its identification and first records in the lower Rhine, and documents its subsequent population development. |
| Tipo: Article / Letter to the editor |
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| Ano: 2000 |
URL: http://www.repository.naturalis.nl/record/504688 |
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| Zonneveld, I.S.; Velde, G. van der; Klooster, W.Ph. ten. |
| Nieuwe soorten in het zoetwatergetijdengebied na de afsluiting van het Haringvliet. Op 29 sept. 1973 vond ik even ten westen van de brug tussen Gorkum en Sleeuwijk aan de zuidelijke oever van de Merwede een voor mij aldaar nieuwe plant: Aster tripolium. De groeiplaats is een voorheen onbegroeid slik, dat echter sinds 1970 weinig meer wordt overspoeld en nu vrijwel is dichtgegroeid. De zeeaster – met lintbloemen en grotendeels in vrucht – komt er verspreid voor tussen vooral Chenopodium rubrum en domineert op één plaats zelfs over een tiental m². Ook C. rubrum (dominant over honderden m²) is aldaar nieuw, evenals Senecio congestus, die in het echte getijdengebied uiterst zeldzaam voorkomt, maar nu door mij in 1972 en 1973 werd waargenomen. Dat S. congestus... |
| Tipo: Article / Letter to the editor |
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| Ano: 1974 |
URL: http://www.repository.naturalis.nl/record/527320 |
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| Fischer, M.A.; Velde, G. van der; Roubos, E.W.. |
| Doto uva Marcus, 1955 is a nudibranch species recorded from the Brazilian and Chilean coast. In spite of its wide distribution, D. uva has been described only superficially, mainly as to the pattern of its coloration, external morphology, radular teeth and reproductive system. Here we substantially extend this description, paying special attention to the morphology, anatomy and histology of the digestive and reproductive system. Furthermore, new data on the morphology of the central nervous system and its cell types are given, and finally, the egg mass is described. On the basis of these data, we consider the Doto specimens described from Chile conspecific with those from Brazil. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Opisthobranchia; Nudibranchia; Doto; Histology; Morphology; Chilean coast; 42.73. |
| Ano: 2006 |
URL: http://www.repository.naturalis.nl/record/214538 |
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| Velde, G. van der. |
| INTRODUCTION During an excursion to Norway organized by the Department of Systematic Zoology of the Rijksuniversiteit of Leiden in August 1973, I had the opportunity to make some observations on Turbellarians of salt-marshes and rocky shores of the Trondheimsfjord (63o 37' N 9° 43' Ε) and the Stjörnfjord (63o 47' Ν 10° 7' Ε), a fjord connected with the Trondheimsfjord. MATERIAL AND METHODS The greater triclad flatworms were mainly collected by turning stones on the salt-marshes and rocky shores. On the salt-marshes soil samples were taken. Each sample covered an area of 25 cm2 and was 3 cm thick. For obtaining the animals the soil samples were put in a jar filled with sea water. Lack of oxygen, due to decay of the vegetable matter, and the light of a lamp... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.76. |
| Ano: 1976 |
URL: http://www.repository.naturalis.nl/record/318579 |
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| Groenenberg, D.S.J.; Wesselingh, F.P.; Rajagopal, S.; Jansen, J.M.; Bos, M.M.; Velde, G. van der; Gittenberger, E.; Hoeksema, B.W.; Raad, H.; Hummel, H.. |
| Late Quaternary (Eemian) deposits of the Netherlands contain shells that resemble those of living Mytilus galloprovincialis. Similar broad-shelled mytilids also occur in estuaries of the southwestern Netherlands together with slender individuals typical of M. edulis. We sampled living mussels along a depth gradient in the Oosterschelde to a) investigate whether a relation exists between shell shape and depth, b) test if the broadshelled specimens might represent M. galloprovincialis (or a hybrid with M. edulis) and c) assess by inference if the Quaternary specimens might be attributed to M. galloprovincialis as well. In order to do so, we compared genetic (length polymorphism of Me 15/16, COIII sequences and AFLPs) and shellmorphological characteristics... |
| Tipo: Article / Letter to the editor |
Palavras-chave: AFLP; COIII; Me 15/16; Mytilus; Shell morphology; The Netherlands; 42.73. |
| Ano: 2011 |
URL: http://www.repository.naturalis.nl/record/376595 |
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| Registros recuperados: 22 | |
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