Species and habitat races in the chrysomelid Galerucella nymphaeae species complex in northern Europe

1998 ◽  
Vol 89 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Christina Nokkala ◽  
Seppo Nokkala
Keyword(s):  
Species Complex ◽  
Northern Europe ◽  
Galerucella Nymphaeae

The species complex of Gremmeniella abietina - intertype hybridization, viruses, and gene flow in northern Europe

2003 ◽  
Vol 81 (12) ◽  
pp. 1213-1215 ◽  
Author(s):  
Jarkko Hantula ◽  
Tero T Tuomivirta
Keyword(s):  
Gene Flow ◽  
Species Complex ◽  
Northern Europe ◽  
Interspecific Mating ◽  
Distinct Virus ◽  
Mycelial Interactions ◽  
Pine Seedlings ◽  
Available Information

In this paper we review the available information on the possibility of gene flow between the European types A and B of Gremmeniella abietina (Lagerb.) Morelet. In nature, types A and B may have mycelial interactions in pine seedlings and lower branches covered by snow during winter. In artificial conditions, the two types are able to produce low-fitness hybrids. The distinct virus populations of the two types, however, suggest that the importance of any possible hybridization in nature is negligible.Key words: interspecific mating, introgression, dsRNA.

scholarly journals Pheromonal and enzyme genetic characteristics of the Bombus lucorum species complex in northern Europe

1996 ◽  
Vol 7 (4) ◽  
pp. 187-194 ◽  
Author(s):  
Pekka Pamilo ◽  
Jan Tengö ◽  
Pierre Rasmont ◽  
Kari Pirhonen ◽  
Antti Pekkarinen ◽  
...  
Keyword(s):  
Species Complex ◽  
Temporal Distribution ◽  
The Other ◽  
Northern Europe ◽  
Genetic Characteristics ◽  
Morphological Distinction ◽  
Bombus Lucorum ◽  
Species Specific ◽  
Labial Glands ◽  
Marking Pheromones

Spatial and temporal distribution of the species in the Bombus lucorum species complex, B. lucorum (L.), B. cryptarum (Fabricius) and B. magnus Vogt, were studied in Finland. Morphological distinction between the species is not as clear as in Central Europe, but B. lucorum can be distinguished from the other two with the help of enzyme genetic markers. B. lucorum is the most common of the three species in most of Finland, and B. cryptarum is abundant in the southwestern coastal area and in northern Lapland. B. magnus was only rarely found among the spring queens in southwestern Finland, and its range possibly restricts to southern and central parts of Finland. A comparison of the chemical composition of the male labial glands and enzyme genotypes shows that males produce species-specific marking pheromones.

Preclinical operative dentistry courses in northern Europe and Scandinavia

1993 ◽  
Vol 57 (4) ◽  
pp. 312-317
Author(s):  
NH Wilson ◽  
A Richards ◽  
J Laverock ◽  
MS Purkiss
Keyword(s):  
Northern Europe ◽  
Operative Dentistry

PCB Check-Up In Northern Europe

2010 ◽  
pp. 100080510134803
Author(s):  
Valerie Brown
Keyword(s):  
Northern Europe

Identification of sibling species in the genus Eucyclops from water-bodies of Ukraine and Russia using crossbreeding studies

2014 ◽  
Vol 25 (1-2) ◽  
pp. 61-68 ◽  
Author(s):  
V. I. Monchenko ◽  
L. P. Gaponova ◽  
V. R. Alekseev
Keyword(s):  
Cryptic Species ◽  
River Basin ◽  
Black Sea ◽  
Species Complex ◽  
River Basins ◽  
Water Bodies ◽  
Similar Species ◽  
Basin Water ◽  
Different Populations ◽  
Baltic Sea Basin

Crossbreeding experiments were used to estimate cryptic species in water bodies of Ukraine and Russia because the most useful criterion in species independence is reproductive isolation. The problem of cryptic species in the genus Eucyclops was examined using interpopulation crosses of populations collected from Baltic Sea basin (pond of Strelka river basin) and Black Sea basin (water-reservoires of Dnieper, Dniester and Danube rivers basins). The results of reciprocal crosses in Eucyclops serrulatus-group are shown that E. serrulatus from different populations but from water bodies belonging to the same river basin crossed each others successfully. The interpopulation crosses of E. serrulatus populations collected from different river basins (Dnipro, Danube and Dniester river basins) were sterile. In this group of experiments we assigned evidence of sterility to four categories: 1) incomplete copulation or absence of copulation; 2) nonviable eggs; 3) absence of egg membranes or egg sacs 4) empty egg membranes. These crossbreeding studies suggest the presence of cryptic species in the E. serrulatus inhabiting ecologically different populations in many parts of its range. The same crossbreeding experiments were carries out between Eucyclops serrulatus and morphological similar species – Eucyclops macruroides from Baltic and Black Sea basins. The reciprocal crossings between these two species were sterile. Thus taxonomic heterogeneity among species of genus Eucyclops lower in E. macruroides than in E. serrulatus. The interpopulation crosses of E. macruroides populations collected from distant part of range were fertile. These crossbreeding studies suggest that E. macruroides species complex was evaluated as more stable than E. serrulatus species complex.

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