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Registros recuperados: 22
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A note on the immigration of Corophium curvispinum Sars, 1895 (Crustacea: Amphipoda) into the Netherlands via the River Rhine Naturalis
Brink, F.W.B. van den; Velde, G. van der; Vaate, A. bij de.
Corophium curvispinum Sars, new to the Netherlands, has been recorded recently from two localities in the River Rhine, close to the Dutch-German border.
Tipo: Article / Letter to the editor
Ano: 1989 URL: http://www.repository.naturalis.nl/record/505554
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Acoelomorpha Naturalis
Velde, G. van der.
Tipo: Article in monograph or in proceedings Palavras-chave: Biodiversiteit; Nederland; Acoelomorpha; 42.76.
Ano: 2010 URL: http://www.repository.naturalis.nl/record/391857
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Anatomical evidence for the occurrence of Lymnaea (Galba) palustris (O.F. Müller, 1774) and L. (Galba) corvus (Gmelin, 1778) (Gastropoda: Lymnaeidae) in the Netherlands Naturalis
Velde, G. van der; Kessel, C.M. van.
A study was made on the Lymnaea (Galba) palustris complex in The Netherlands. Investigations on the genitalia proved that in The Netherlands two species are present, viz. L. palustris (O. F. Müller, 1774) and L. corvus (Gmelin, 1778), which can not in all cases be distinguished by shell characters. Genitalia were prepared, drawn and several measurements were carried out to investigate the variation within the two species. It appeared that most characters show a partial or total overlap. Some characters appeared to separate the two species absolutely. One of these is very useful for a quick distinction of both species, viz. the situation of the truncus receptaculi with respect to the oviductus, which character is already visible after a general dissection...
Tipo: Article / Letter to the editor Palavras-chave: Mollusca; Gastropoda; Lymnaeidae; Lymnaea (Galba) palustris; L. (Galba) corvus; Anatomy; The Netherlands; 42.73.
Ano: 1984 URL: http://www.repository.naturalis.nl/record/318120
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Brederveldia bidentata gen. n., sp. n., a new species of the family Trigonostomidae (Turbellaria, Neorhabdocoela) from the Netherlands Naturalis
Velde, G. van der; Winkel, J.L.M.W. van de.
A new species is described belonging to a new genus within the subfamily Trigonostominae. It was found in a salt-marsh in the island of Texel, The Netherlands.
Tipo: Article / Letter to the editor
Ano: 1975 URL: http://www.repository.naturalis.nl/record/505274
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BRONPLATWORM CRENOBIA ALPINA (DANA, 1766) Naturalis
Kalkman, V.J.; Velde, G. van der.
Tipo: Part of book or chapter of book Palavras-chave: Factsheet; Leefgebieden; Beleid; Platwormen.
Ano: 2008 URL: http://www.repository.naturalis.nl/record/266419
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Catenulida & Rhabditophora (‘Turbellaria’) - trilhaarwormen Naturalis
Velde, G. van der; Land, J. van der.
Tipo: Article in monograph or in proceedings Palavras-chave: Biodiversiteit; Nederland; Trilhaarwormen; 42.76.
Ano: 2010 URL: http://www.repository.naturalis.nl/record/391865
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Current status of the freshwater Mysidae in The Netherlands, with records of Limnomysis benedeni Czerniavsky, 1882, a Pontocaspian species in Dutch Rhine branches Naturalis
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
Ano: 1999 URL: http://www.repository.naturalis.nl/record/505416
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De Kleine Koornaarvis, Atherina mochon Valenciennes, 1835, in Nederland (Pisces, Atherinidae) Naturalis
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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De verspreiding van Nymphaea candida Presl en Nymphaea alba L. in Nederland Naturalis
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
Ano: 1978 URL: http://www.repository.naturalis.nl/record/527532
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De waarde van de Kagerplassen, vastgesteld aan de hand van de macrofauna, in het bijzonder die van de oevers Naturalis
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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Een hydrobiologische inventarisatie van sloten in het Oude Land van Strijen en de St. Anthonie-polder (Hoekse Waard) Naturalis
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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Identification, invasion and population development of the ponto-caspian isopod Jaera istri Veuille (Janiridae) in the lower Rhine, the Netherlands Naturalis
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
Ano: 2000 URL: http://www.repository.naturalis.nl/record/504688
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Immigration of Echinogammarus (Stebbing, 1899) (Crustacea: Amphipoda) into The Netherlands via the lower Rhine Naturalis
Brink, F.W.B. van den; Paffen, B.G.P.; Oosterbroek, F.M.J.; Velde, G. van der.
Echinogammarus ischnus (Stebbing), new to the Netherlands, has recently been recorded from two localities in the Lower Rhine, close to the Dutch-German border.
Tipo: Article / Letter to the editor
Ano: 1993 URL: http://www.repository.naturalis.nl/record/505357
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Korte mededelingen Naturalis
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
Ano: 1974 URL: http://www.repository.naturalis.nl/record/527320
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Morphology, anatomy and histology of Doto uva Marcus, 1955 (Opisthobranchia: Nudibranchia) from the Chilean coast Naturalis
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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New records of Marine Turbellaria from Norway Naturalis
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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On the identity of broad-shelled mussels (Mollusca, Bivalvia, Mytilus) from the Dutch delta region Naturalis
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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Platwormen Naturalis
Kalkman, V.J.; Velde, G. van der.
Factsheets van de platwormen van het leefgebiedenbeleid.
Tipo: Part of book or chapter of book Palavras-chave: Platwormen; Natuurbescherming; Leefgebieden; Beleid; 42.71.
Ano: 2008 URL: http://www.repository.naturalis.nl/record/264586
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Platyhelminthes - platwormen Naturalis
Cremers, H.J.W.M.; Velde, G. van der; Land, J. van der.
Tipo: Article in monograph or in proceedings Palavras-chave: Biodiversiteit; Nederland; Platwormen; 42.76.
Ano: 2010 URL: http://www.repository.naturalis.nl/record/391863
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Risks and management of non-native Impatiens species in the Netherlands Naturalis
Matthews, J.; Beringen, R.; Boer, E.; Duistermaat, H.; Odé, B.; Valkenburg, J.L.C.H. van; Velde, G. van der; Leuven, R.S.E.W..
Tipo: Report Palavras-chave: Dispersion; Ecological effects; Invasive species; Management options; Public health; Socio-economic impacts; 42.54; 42.44.
Ano: 2015 URL: http://www.repository.naturalis.nl/record/579645
Registros recuperados: 22
Primeira ... 12 ... Última
 

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