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| Fadil, Fatima; Dakki, Mohamed. |
| A review is given of literature on Moroccan members of the genus Gammarus (Crustacea Amphipoda). Only four Gammarus species were known with certainty from Morocco, viz. Gammarus gauthieri (Karaman, 1935); Gammarus acalceolatus Pinkster, 1971; Gammarus rouxi Pinkster & Goedmakers, 1975; and Gammarus microps Pinkster & Goedmakers, 1975. In the present paper, a new species of Gammarus, G. maroccanus n. sp. is described from freshwater of the northern central region in Morocco, with remarks on its affinities and its ecology. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Systématique; Crustacés Amphipodes; Gammarus; Maroc. |
| Ano: 2001 |
URL: http://www.repository.naturalis.nl/record/505197 |
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| Scheepmaker, Maarten. |
| Genetic differentiation among population samples of G. gauthieri on both sides of the Strait of Gibraltar was investigated by enzyme electrophoresis at 20 enzyme loci with reference to G. gauthieri and G. ibericus from different areas in the Iberian peninsula. Levels of divergence resolved suggest that G. gauthieri reached North Africa from the Iberian peninsula, and not vice versa. With reference to geological evidence, this was likely to occur during the Messinian (6—5 My ago). As the opening of the Strait of Gibraltar represents a well dated geological event, an attempt has been made to calibrate the molecular clock for the G. pulex-group. Indirect estimations of gene flow levels were shown to be extremely low. Probably as a consequence of frequently... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Distribution; Genetic divergence; Gene flow; Molecular clock; Gammarus. |
| Ano: 1990 |
URL: http://www.repository.naturalis.nl/record/503962 |
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| Stock, J.H.; Mirzajani, A.R.; Vonk, R.; Naderi, S.; Kiabi, B.H.. |
| 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. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Iran; Amphipoda; New species; Obesogammarus; Gammarus; Derzhavinella; Scytaelina n. gen. |
| Ano: 1998 |
URL: http://www.repository.naturalis.nl/record/504949 |
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| Scheepmaker, Maarten. |
| Genetic differentiation of morphologically variable members of the G. pulex-group in northwestern Europe was investigated by electrophoresis at 20 enzyme loci. Five recently described related forms were examined with reference to the “classical” species G. pulex, G. wautieri and G. fossarum. G. pulex and G. wautieri were shown to be genetically homogeneous and clearly distinct species. In the other species, morphologically similar forms were shown to be genetically distant, and inter-areal intraspecific genetic differentiation may warrant recognition of subspecies or sibling species. In some cases, levels of reproductive isolation of the forms involved could be assessed by cross-breeding experiments. To estimate dispersal capabilities, gene flow levels... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Taxonomy; Distribution; Population structure; Intra-specific divergence; Gammarus. |
| Ano: 1990 |
URL: http://www.repository.naturalis.nl/record/504326 |
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| Scheepmaker, Maarten; Dalfsen, Jan van. |
| Genetic differentiation among G. fossarum Koch, 1835 from different stations in Germany, Switzerland, Belgium and northern France, and the closely related Belgian form G. caparti Pètre-Stroobants, 1980 was investigated by electrophoresis at 20 enzyme loci. Although morphologically variable, geographically distant populations of G. cf. fossarum were hitherto considered conspecific. In the present study, populations of G. cf. fossarum and G. caparti were examined with reference to G. pulex pulex as an estimate for genetic differentiation at the species level. With G. p. pulex as a standard, genetic differentiation among geographically distant populations of G. cf. fossarum is occasionally observed at species level. The populations of G. caparti studied were... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Taxonomy; Distribution; Morphology; Genetic variability; Gammarus. |
| Ano: 1989 |
URL: http://www.repository.naturalis.nl/record/504137 |
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