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Your search keyword '"Khokhlova, Irina S."' showing total 675 results
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675 results on '"Khokhlova, Irina S."'

19. Environment and traits affect parasite and host species positions but not roles in flea–mammal networks.

Author

KRASNOV, Boris R., SHENBROT, Georgy I., KHOKHLOVA, Irina S., LÓPEZ BERRIZBEITIA, M. Fernanda, MATTHEE, Sonja, SANCHEZ, Juliana P., and VAN DER MESCHT, Luther

Subjects
FLEAS, SPECIES, STATISTICAL reliability, MAMMALS, PARASITES
Abstract

We studied spatial variation in the effects of environment and network size on species positions and roles in multiple flea–mammal networks from four biogeographic realms. We asked whether species positions (measured as species strength [SS], the degree of interaction specialization [d′], and the eigenvector centrality [C]) or the roles of fleas and their hosts in the interaction networks: (a) are repeatable/conserved within a flea or a host species; (b) vary in dependence on environmental variables and/or network size; and (c) the effects of environment and network size on species positions or roles in the networks depend on species traits. The repeatability analysis of species position indices for 441 flea and 429 host species, occurring in at least two networks, demonstrated that the repeatability of SS, d′, and C within a species was significant, although not especially high, suggesting that the indices' values were affected by local factors. The majority of flea and host species in the majority of networks demonstrated a peripheral role. A value of at least one index of species position was significantly affected by environmental variables or network size in 41 and 36, respectively, of the 52 flea and 52 host species that occurred in multiple networks. In both fleas and hosts, the occurrence of the significant effect of environment or network size on at least one index of species position, but not on a species' role in a network, was associated with some species traits. [ABSTRACT FROM AUTHOR]

Published
2024
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27. Congruence between co-occurrence and trait-based networks is scale-dependent: a case study with flea parasites of small mammalian hosts.

Author

Krasnov, Boris R., Khokhlova, Irina S., Korallo-Vinarskaya, Natalya P., Laudisoit, Anne, López Berrizbeitia, M. Fernanda, Matthee, Sonja, Sanchez, Julliana P., Stanko, Michal, van der Mesht, Luther, and Vinarski, Maxim V.

Subjects
*STOCHASTIC processes, *DETERMINISTIC processes, *FLEAS, *PARASITES, *SPECIES
Abstract

We applied a novel framework based on network theory and a concept of modularity that estimates congruence between trait-based (= functional) co-occurrence networks, thus allowing the inference of co-occurrence patterns and the determination of the predominant mechanism of community assembly. The aim was to investigate the relationships between species co-occurrence and trait similarity in flea communities at various scales (compound communities: across regions within a biogeographic realm or across sampling sites within a geographic region; component communities: across sampling sites within a geographic region; and infracommunities: within a sampling site). We found that compound communities within biogeographic realms were assembled via environmental or host-associated filtering. In contrast, functional and spatial/host-associated co-occurrence networks, at the scale of regional compound communities, mostly indicated either stochastic processes or the lack of dominance of any deterministic process. Analyses of congruence between functional and either spatial (for component communities) or host-associated (for infracommunities) co-occurrence networks demonstrated that assembly rules in these communities varied among host species. In component communities, stochastic processes prevailed, whereas environmental filtering was indicated in 4 and limiting similarity/competition in 9 of 31 communities. Limiting similarity/competition processes dominated in infracommunities, followed by stochastic mechanisms. We conclude that assembly processes in parasite communities are scale-dependent, with different mechanisms acting at different scales. [ABSTRACT FROM AUTHOR]

Published
2024
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28. Latitudinal distributions of the species richness, phylogenetic diversity, and functional diversity of fleas and their small mammalian hosts in four geographic quadrants

Author

Krasnov, Boris R., primary, Grabovsky, Vasily I., additional, Khokhlova, Irina S., additional, Fernanda López Berrizbeitia, Maria, additional, Matthee, Sonja, additional, Roll, Uri, additional, Sanchez, Juliana P., additional, Shenbrot, Georgy I., additional, and van der Mescht, Luther, additional

Published
2023
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