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| Registros recuperados: 2.080 | |
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| Aa, F. van der; Stoffers, A.L.. |
| Perennial herbs, undershrubs or lianas, mostly with milky or watery juice. Leaves opposite or whorled, membranaceous, coriaceous or fleshy. Stipules wanting, very small or rudimentary. Flowers actinomorphic, usually 5-merous, rarely very large. Inflorescence consisting of extra-axillary or terminal panicles, racemes, umbels or cymes or flowers solitary. Calyx persistent, 5-lobed, the segments imbricate or separate in the bud, the tube short. Corolla sympetalous, shortly or deeply 5-fid, rotate, campanulate, infundibuliform, hypocrateriform or tubular; the segments commonly reflexed; aestivation imbricate, contorted or rarely valvate. Corona usually present, taking various forms and formed either wholly or partly by appendages to the corolla or the staminal... |
| Tipo: Article / Letter to the editor |
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| Ano: 1982 |
URL: http://www.repository.naturalis.nl/record/503245 |
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| Abarnou, Alain. |
| Une industrialisation et une urbanisation accrues du littoral ont pu entraîner une augmentation de divers rejets dans le milieu marin. Le problème des rejets chlorés se pose en raison des débits concernés et aussi de la diversité des composés à priori toxiques ainsi dispersés. La chloration a pour but l'élimination des micro-organismes des eaux traitées : germes pathogènes dans le cas de la désinfection des effluents de stations d'épuration des eaux usées, organismes susceptibles de se fixer et de se développer sur les parois des circuits dans le cas du traitement des eaux de refroidissement des usines implantées en bord de mer. Cette activité biocide doit se limiter aux seuls organismes visés et ne pas entraîner la présence dans les eaux d'oxydants... |
| Tipo: Text |
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| Ano: 1982 |
URL: http://archimer.ifremer.fr/doc/1982/publication-7023.pdf |
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| Adema, F.; Mennema, J.. |
| Op p. 27 van deze aflevering stelt E.J. Weeda onder meer, dat de voorjaarssoorten in de in 1980 afgesloten tweede inventarisatieronde vaak onvolledig zijn ‘gehokt’. Dit is voor ons aanleiding geweest om de gebruikelijke zaterdagexcursies, georganiseerd door het Rijksherbarium en de Commissie voor het Floristisch Onderzoek van Nederland van de Koninklijke Nederlandse Botanische Vereniging, dit jaar eerder te starten dan in voorgaande jaren en speciale aandacht te wijden aan de voorjaarsflora. De overige zaterdagexcursies zullen in 1982 vooral daar worden gehouden, waar aanvullende gegevens node worden ontbeerd. De excursies zijn toegankelijk voor een ieder die belangstelling heeft in de Nederlandse floristiek. Zij worden gehouden op: datum plaats van... |
| Tipo: Article / Letter to the editor |
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| Ano: 1982 |
URL: http://www.repository.naturalis.nl/record/527701 |
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| Adema, J.P.H.M.. |
| Until the appearance, in 1970, of the American crayfish Orconectes limosus (Rafinesque, 1817) in the Netherlands, only a single species of crayfish was known here: Astacus astacus (Linnaeus, 1758). Geelen (1978a, b) provided an extensive discussion on the distribution of the two species. On 13.vi.1980 the Rijksinstituut voor Visserijonderzoek of IJmuiden (National Institution for fishery Research, RIVO) presented the RMNH a freshwater crayfish with a request for identification. The specimen was caught by a fisherman in a freshwaterpond (named IJ) near Spaarndam, NW of Haarlem, province of Noord-Holland. The pond has an open connection with the Noorzeekanaal, the mostly brackish canal that connects Amsterdam with the North Sea. The crayfish, a male with a... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1982 |
URL: http://www.repository.naturalis.nl/record/317236 |
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| Adema, J.P.H.M.; Creutzberg , F.; Noort, G.J. van. |
| INTRODUCTION Since April 1972 an ecological trawl-survey programme has been undertaken by the Netherlands Institute for Sea Research (NIOZ), Texel, in the southern North Sea with the R. V. "Aurelia". The main object is to obtain information on distribution, density, biomass and fluctuations of crawling or swimming demersal (epibenthic) fauna such as small fishes, shrimps, prawns, crabs, asteroids, ophiuroids and some gastropods, for the evaluation of the role of these carnivores in the benthic ecosystem of the southern North Sea. Sedimentological aspects of the area are described by Creutzberg & Postma (1979). Within the context of the present paper the most important feature is the mesh of 5 x 5 mm2 of the cod end of the 51/2 m beam-trawl used and the... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1982 |
URL: http://www.repository.naturalis.nl/record/317267 |
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| Adema, J.P.H.M.; Huwae, P.H.M.. |
| INTRODUCTION Part XVI of the Fauna van Nederland, Isopoda & Tanaidacea (Holthuis, 1956), deals with 27 species of Isopoda occurring in salt and/or brackish water. According to Holthuis (1956) the occurrence in the Netherlands of two of these, Sphaeroma serratum (Fabricius, 1787) and Bopyrus squillarum Latreille, 1802, is very doubtful and will remain so, as the material on which the records were based is lost and no new records of these species have been published for the Netherlands. Since 1956 many new data were obtained for several of the remaining 25 species, while 12 species were found for the first time in Dutch waters or in the southern North Sea. The present paper deals with the more interesting finds. Part of the species mentioned here have... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1982 |
URL: http://www.repository.naturalis.nl/record/317279 |
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| Adetayo, J.A.. |
| Between 1969-1980, the annual shrimp catch ranged from 585 to 21116 tonnes. The percentage of shrimp in the total catch showed a sharp decline from 75% in 1969 to 18% in 1979 while the fish by-catch rose from 25% to 82. The shrimps were abundant during the rains (April to September). The number of shrimpers and effort rose by 338% and 337% respectively. The mean annual catch per unit effort (cpue) ranged between 0,196 in 1972 and 0.365 (tonne per day out of (port) in 1975. Japan, United States of America, and Britain are the main importers of Nigerian shrimps. |
| Tipo: Report |
Palavras-chave: Shrimp fishery; Fishery development. |
| Ano: 1982 |
URL: http://hdl.handle.net/1834/2320 |
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| Adis,Joachim; Bogen,Vera. |
| Abstract Horizontal migration in response to flooding is reported for Glossoscolecidae of a black-water inundation forest. During increasing water-level, Glossoscolecidae migrate towards the dry-land forest, 16-26m distance beyond the water margin. With decreasing water-level, they return to the inundation-forest, following the water margin at 5-10m distance. Distribution seems to be correlated with humidity and pH of the soil. |
| Ano: 1982 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59671982000400741 |
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| Akkermans, R.W.A.P.; Berg, C.C.. |
| The 42 recognized species of Coussapoa are listed with their synonyms and distribution. Eleven new species are described: C. argentea Akkermans & Berg, C. arachnoidea. Akkermans & Berg, C. batavorum Akkermans & Berg, C. cupularis Akkermans & Berg, C. echinata Akkermans & Berg, C. floccosa Akkermans & Berg, C. longepedunculata Akkermans & Berg, C. macerrima Akkermans & Berg, C. napoënsis Akkermans & Berg, C. pachyphylla Akkermans & Berg, and C. scabra Akkermans & Berg. Some new combinations are made. Keys to the species of 8 regions are presented. |
| Tipo: Article / Letter to the editor |
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| Ano: 1982 |
URL: http://www.repository.naturalis.nl/record/534798 |
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| Registros recuperados: 2.080 | |
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