Thus far, the endemic fairy shrimp Chirocephalus ruffoi Cottarelli & Mura, 1984 is represented in Italy by two populations only, occurring in Pollino National Park (Calabro-Lucano Apennines) and Monte Rondinaio (Tosco-Emiliano Apennines), respectively. Given the distance between the two sites (one in southern Italy, the other in northern Italy, approximately 800 km apart), the probable lack of gene flow suggested both morphological and electrophoretic studies to clarify their systematic position. SEM morphological investigations revealed clear, though slight, inter-population differences in cyst morphology. However, the substantial individual variation in male secondary sexual characters observed in both populations does not correspond to clear differences in the remaining characters of adult males. Yet, the extent of genetic divergence between the two populations evaluated by means of allozyme variation analysis at 22 loci (D = 0.259), suggests the absence of gene flow between these. Thus, as in other previous cases, morphological criteria and allozyme analysis would indicate contrasting conclusions concerning the systematic position of the taxa considered. Given the limited degree of current knowledge on the distribution of C. ruffoi in Italy, more extensive field investigations as well as the use of molecular analysis at the DNA level are needed to clarify the situation.

Phenotypic and genotypic variation in the two known populations of Chirocephalus ruffoi Cottarelli & Mura, 1984 (Crustacea, Anostraca) endemic to Italy / P., Zarattini; Ketmaier, Valerio; Mura, Graziella; DE MATTHAEIS, Elvira. - In: CRUSTACEANA. - ISSN 0011-216X. - STAMPA. - 74:(2001), pp. 377-388. [10.1163/156854001300104462]

Phenotypic and genotypic variation in the two known populations of Chirocephalus ruffoi Cottarelli & Mura, 1984 (Crustacea, Anostraca) endemic to Italy

KETMAIER, Valerio;MURA, Graziella;DE MATTHAEIS, Elvira
2001

Abstract

Thus far, the endemic fairy shrimp Chirocephalus ruffoi Cottarelli & Mura, 1984 is represented in Italy by two populations only, occurring in Pollino National Park (Calabro-Lucano Apennines) and Monte Rondinaio (Tosco-Emiliano Apennines), respectively. Given the distance between the two sites (one in southern Italy, the other in northern Italy, approximately 800 km apart), the probable lack of gene flow suggested both morphological and electrophoretic studies to clarify their systematic position. SEM morphological investigations revealed clear, though slight, inter-population differences in cyst morphology. However, the substantial individual variation in male secondary sexual characters observed in both populations does not correspond to clear differences in the remaining characters of adult males. Yet, the extent of genetic divergence between the two populations evaluated by means of allozyme variation analysis at 22 loci (D = 0.259), suggests the absence of gene flow between these. Thus, as in other previous cases, morphological criteria and allozyme analysis would indicate contrasting conclusions concerning the systematic position of the taxa considered. Given the limited degree of current knowledge on the distribution of C. ruffoi in Italy, more extensive field investigations as well as the use of molecular analysis at the DNA level are needed to clarify the situation.
2001
CHIROCEPHALUS RUFFOI, FAIRY SHRIMP, CRUSTACEA,TAXONOMY
01 Pubblicazione su rivista::01a Articolo in rivista
Phenotypic and genotypic variation in the two known populations of Chirocephalus ruffoi Cottarelli & Mura, 1984 (Crustacea, Anostraca) endemic to Italy / P., Zarattini; Ketmaier, Valerio; Mura, Graziella; DE MATTHAEIS, Elvira. - In: CRUSTACEANA. - ISSN 0011-216X. - STAMPA. - 74:(2001), pp. 377-388. [10.1163/156854001300104462]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/256456
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