Barinova S.S.,Institute of Evolution |
Klochenko P.D.,Ukrainian Academy of Sciences |
Belous Ye.P.,Ukrainian Academy of Sciences
Hydrobiological Journal | Year: 2015
The theory, practice, and methodology of bioindication and assessment of the ecological state of aquatic ecosystems were elaborated on the basis of long-term investigations of continental water bodies and watercourses of the countries of the Former Soviet Union and of the other countries of Europe, Asia, and Middle East. The ecological state of aquatic ecosystems was assessed in terms of abiotic and biotic components. Original indices and system of ecological mapping were put forward. The methods of the indication of the influence of climatic changes on the diversity of algae, and also integral tables essential to classify water quality from the ecological point of view, are presented.
O'Donnell A.J.,Institute of Evolution |
Schneider P.,University of Edinburgh |
McWatters H.G.,University of Oxford |
Reece S.E.,Institute of Evolution |
Reece S.E.,University of Edinburgh
Proceedings of the Royal Society B: Biological Sciences | Year: 2011
Circadian biology assumes that biological rhythms maximize fitness by enabling organisms to coordinate with their environment. Despite circadian clocks being such a widespread phenomenon, demonstrating the fitness benefits of temporal coordination is challenging and such studies are rare. Here, we tested the consequences-for parasites-of being temporally mismatched to host circadian rhythms using the rodent malaria parasite, Plasmodium chabaudi. The cyclical nature of malaria infections is well known, as the cell cycles across parasite species last a multiple of approximately 24 h, but the evolutionary explanations for periodicity are poorly understood. We demonstrate that perturbation of parasite rhythms results in a twofold cost to the production of replicating and transmission stages. Thus, synchronizationwith host rhythms influences in-host survival and between-host transmission potential, revealing a role for circadian rhythms in the evolution of host-parasite interactions. More generally, our results provide a demonstration of the adaptive value of circadian rhythms and the utility of using an evolutionary framework to understand parasite traits. © 2011 The Royal Society.
Segev O.,Institute of Evolution |
Hill N.,Institute of Evolution |
Templeton A.R.,Institute of Evolution |
Templeton A.R.,Washington University in St. Louis |
Blaustein L.,Institute of Evolution
Journal for Nature Conservation | Year: 2010
The fire salamander, Salamandra infraimmaculata, is listed as an endangered species in Israel and Israeli populations represent the genus' worldwide southern-most limit. This endangered classification was based largely on limited mark-recapture data and on using the Lincoln index whose assumptions of equal catchability, time homogeneity and a closed population are unlikely kept for salamander populations. We estimated population size at five breeding sites in northern Israel - two permanent and three temporary breeding sites - for up to three years using a non-parametric procedure that allows the probabilities of recapture to vary both with time and with individual animal. We also compared breeding phenology and population size structure at these same sites. Population estimates at some breeding sites were larger than previously thought. Adult population size was not correlated with the size of the water body, but instead, sites with permanent water bodies had significantly larger populations. First arrival date to the breeding site of individuals on consecutive years was positively correlated at all sites suggesting that some individuals breed consistently early while others breed consistently late. Activity abundance was correlated with daily rainfall at a permanent site but not at an adjacent temporary site. Instead, activity abundance at the temporary breeding site was synchronised with pool inundation, which did not occur during the first rains. Males remained longer than females at all breeding sites. This study provides clear management implications both in terms of determining the vulnerability of specific populations, and in suggesting that permanent breeding sites are much more likely to support larger populations. © 2009 Elsevier GmbH. All rights reserved.