Gene Flow in Ground Beetles (Coleoptera: Carabidae) of Differing Habitat Preference and Flight-Wing Development

Evolution ◽  
1988 ◽  
Vol 42 (1) ◽  
pp. 129 ◽  
Author(s):  
James K. Liebherr
Keyword(s):  
Gene Flow ◽  
Habitat Preference ◽  
Ground Beetles ◽  
Wing Development

Differentiation and Interrelations of Two Representatives of Laudakia stellio Complex (Reptilia: Agamidae) in Israel

2011 ◽  
Vol 4 (2) ◽  
pp. 102-114 ◽  
Author(s):  
Evgenyi N. Panov ◽  
Larissa Yu. Zykova
Keyword(s):  
Population Structure ◽  
Gene Flow ◽  
Habitat Preference ◽  
Additional Data ◽  
Near East ◽  
Field Studies ◽  
Subspecies Level ◽  
Limited Gene Flow ◽  
Study Sites ◽  
And Behavior

Field studies were conducted in Central Negev within the breeding range of Laudakia stellio brachydactyla and in NE Israel (Qyriat Shemona) in the range of an unnamed form (tentatively “Near-East Rock Agama”), during March – May 1996. Additional data have been collected in Jerusalem at a distance of ca. 110 km from the first and about 170 km from the second study sites. A total of 63 individuals were caught and examined. The animals were marked and their subsequent movements were followed. Social and signal behavior of both forms were described and compared. Lizards from Negev and Qyriat Shemona differ from each other sharply in external morphology, habitat preference, population structure, and behavior. The differences obviously exceed the subspecies level. At the same time, the lizards from Jerusalem tend to be intermediate morphologically between those from both above-named localities, which permits admitting the existence of a limited gene flow between lizard populations of Negev and northern Israel. The lizards from NE Israel apparently do not belong to the nominate subspecies of L. stellio and should be regarded as one more subspecies within the species.

scholarly journals What role does natural selection play in speciation?

2010 ◽  
Vol 365 (1547) ◽  
pp. 1825-1840 ◽  
Author(s):  
N. H. Barton
Keyword(s):  
Gene Flow ◽  
Habitat Preference ◽  
Genetic Variance ◽  
Bimodal Distribution ◽  
Biological Species ◽  
Disruptive Selection ◽  
Linkage Equilibrium ◽  
Sexual Population ◽  
Trade Off ◽  
High Gene

If distinct biological species are to coexist in sympatry, they must be reproductively isolated and must exploit different limiting resources. A two-niche Levene model is analysed, in which habitat preference and survival depend on underlying additive traits. The population genetics of preference and viability are equivalent. However, there is a linear trade-off between the chances of settling in either niche, whereas viabilities may be constrained arbitrarily. With a convex trade-off, a sexual population evolves a single generalist genotype, whereas with a concave trade-off, disruptive selection favours maximal variance. A pure habitat preference evolves to global linkage equilibrium if mating occurs in a single pool, but remarkably, evolves to pairwise linkage equilibrium within niches if mating is within those niches—independent of the genetics. With a concave trade-off, the population shifts sharply between a unimodal distribution with high gene flow and a bimodal distribution with strong isolation, as the underlying genetic variance increases. However, these alternative states are only simultaneously stable for a narrow parameter range. A sharp threshold is only seen if survival in the ‘wrong’ niche is low; otherwise, strong isolation is impossible. Gene flow from divergent demes makes speciation much easier in parapatry than in sympatry.

Island Colonization of Carabidae: Neutrality or Habitat Choice?

2009 ◽  
Vol 55 (3) ◽  
pp. 253-262 ◽  
Author(s):  
Marcin Zalewskia ◽  
Werner Ulrich
Keyword(s):  
Habitat Heterogeneity ◽  
Habitat Choice ◽  
Ground Beetles ◽  
Dispersal Ability ◽  
Wing Development ◽  
Neutral Model ◽  
Rank Tests ◽  
Island Colonization ◽  
Species Pairs ◽  
Significant Factors

Carabidae of 15 island and two forested mainland sites from the largest archipelago in Poland, the Mazurian Lake Mamry, were sampled to infer whether island colonization can be linked to habitat heterogeneity and island isolation or whether a previously applied neutral model explains observed spatial distributions best. Kruskall-Wallis rank tests and regression analysis did not point to wing development (a proxy for dispersal ability), island isolation, and heterogeneity as significant factors that influence occupancy. Subsequent analysis of species co-occurrences and nestedness pointed to random pairwise species associations. Co-occurrence analysis of all species pairs found many fewer significantly non-random species pairs (at the 5% error benchmark) than expected by chance. These results do not point to habitat selection by ground beetles but rather favor the view that island colonization is a random process that is best modeled from a neutral perspective.

Great Wall blocks gene flow

Nature ◽  
2003 ◽  
Author(s):  
HelenR. Pilcher
Keyword(s):  
Gene Flow ◽  
Great Wall

Carabidae of Barnaul city parks: ecological characteristics and species composition

2018 ◽  
Vol 8 (2) ◽  
pp. 348-353
Author(s):  
E. A. Kuchina ◽  
N. D. Ovcharenko ◽  
L. D. Vasileva
Keyword(s):  
Species Composition ◽  
Diversity Index ◽  
Similarity Index ◽  
Life Forms ◽  
Ground Beetles ◽  
Forest Steppe ◽  
Ecological Groups ◽  
Dominant Group ◽  
Species Diversity Index ◽  
Steppe Species

<p>Anthropogenic impact on the population of ground beetles leads to a change in their numbers, structure of dominance, density, species composition, spectrum of life forms. This makes the beetles Carabidae a convenient and informative bioindicator of the ecological state of biocenoses. The material for this work was the Carabidae collections conducted in June-August 2016-2017 in the park zone of different regions of Barnaul, differing in location, area, hydrological regime, vegetation cover, purpose and anthropogenic load. When processing the material, the quantitative, species and generic composition of the carabidae was determined, calculations were made for such indicators as the Berger-Parker dominance index, the Shannon species diversity index (Hs), and the Jacquard species similarity index. The fauna (Coleoptera, Carabidae) of the park zone of Barnaul is represented by 55 species belonging to 20 genera. The dominant group is represented by species belonging to steppe, forest and polyzonal groups. Forest-steppe species of ground beetles as dominants have not been identified in any of the investigated territories. The greatest variety of ecological groups was noted on the territory of the Yubileyny рark, which is explained by the presence of zones with various microclimatic conditions, the presence of a birch grove that flows through the park with the Pivovarka River, and a wide log in the park. Registered species belong to eight groups of life forms belonging to two classes - zoophagous and myxophytophagous. On the numerical and species abundance, zoophages predominate. The spectrum of life forms corresponds to the zonal spectrum characteristic of the forest-steppe zone.</p><p> </p>

Sign in / Sign up

Export Citation Format

Share Document