Πέμπτη 13 Αυγούστου 2020

 

The relative impact of evolving pleiotropy and mutational correlation on trait divergence [NEW RESULTS]
Both pleiotropic connectivity and mutational correlations can restrict the divergence of traits under directional selection, but it is unknown which is more important in trait evolution. In order to address this question, we create a model that permits within-population variation in both pleiotropic connectivity and mutational correlation, and compare their relative importance to trait evolution. Specifically, we developed an individual-based, stochastic model where mutations can affect whether a...
bioRxiv Subject Collection: Evolutionary Biology
Thu Aug 13, 2020 03:00
Unidirectional response to bidirectional selection on body size. I. Phenotypic, life history and endocrine response [NEW RESULTS]
Anthropogenic perturbations such as harvesting often select against a large body size and are predicted to induce rapid evolution towards smaller body sizes and earlier maturation. However, body-size evolvability and, hence, adaptability to anthropogenic perturbations remain seldom evaluated in wild populations. Here, we use a laboratory experiment over 6 generations to measure the ability of wild-caught medaka fish (Oryzias latipes) to evolve in response to bidirectional size-dependent selection...
bioRxiv Subject Collection: Evolutionary Biology
Thu Aug 13, 2020 03:00
Gene-tree Species-tree Discordance in the Eared Seals is best explained by Incomplete Lineage Sorting following Explosive Radiation in the Southern Hemisphere [NEW RESULTS]
The phylogeny and systematics of fur seals and sea lions (Otariidae) have long been studied with diverse data types, including an increasing amount of molecular data. However, only a few phylogenetic relationships have reached acceptance pointing at strong gene-tree species tree discordance. Divergence times in the group also vary largely between studies. These uncertainties impeded the understanding of the biogeographical history of the group, such as when and how trans-equatorial dispersal and...
bioRxiv Subject Collection: Evolutionary Biology
Thu Aug 13, 2020 03:00
Phylogeography and population genetic structure of red muntjacs: Evidence of enigmatic Himalayan red muntjac from India [NEW RESULTS]
We investigated the phylogeographic pattern of red muntjac across its distribution range, intending to address the presence of distinct lineages from Northwest India. The Complete mitogenome analysis revealed that India holds three mitochondrial lineages of red muntjac, whereas four were identified from its entire distribution range: Himalayan red muntjac (M. (m.) aureus), Northern red muntjac (M. vaginalis), Srilankan and Western Ghat India (M. malabaricus) and Southern red muntjac (M. muntjak)...
bioRxiv Subject Collection: Evolutionary Biology
Thu Aug 13, 2020 03:00
Genetic diversity and population structure analyses in the Alpine plum (Prunus brigantina Vill.) confirm its affiliation to the Armeniaca section [NEW RESULTS]
In-depth characterization of the genetic diversity and population structure of wild relatives of crops is of paramount importance for genetic improvement and biodiversity conservation, and is particularly crucial when the wild relatives of crops are endangered. In this study, we therefore sampled the Alpine plum (Briancon apricot) Prunus brigantina Vill. across its natural distribution in the French Alps, where its populations are severely fragmented and its population size strongly impacted by humans....
bioRxiv Subject Collection: Evolutionary Biology
Thu Aug 13, 2020 03:00
The Biogeography of Dromiciops in Southern South America: middle Miocene transgressions, speciation and associations with Nothofagus [NEW RESULTS]
Aim: Several geological events affecting Southern South America during the middle Miocene climatic optimum acted as important drivers of diversification to the biota. This is the case of Microbiotheria, for which Dromiciops is considered the sole surviving lineage, the sister group of Eomarsupialia (Australian marsupials). Three main Dromiciops genetic lineages are known, whose divergence was initially attributed to recent Pleistocene glaciations. Using fossil-calibrated dating on nuclear and mitochondrial...
bioRxiv Subject Collection: Evolutionary Biology
Thu Aug 13, 2020 03:00
Pleistocene stickleback genomes reveal the constraints on parallel evolution [NEW RESULTS]
Parallel evolution is typically studied by comparing modern populations from contrasting environments, therefore the chronology of adaptive changes remains poorly understood. We applied a paleogenomics approach to investigate this temporal component of adaptation by sequencing the genomes of 11-13,000-year-old stickleback recovered from the transitionary layer between marine and freshwater sediments of two Norwegian isolation lakes, and comparing them with 30 modern stickleback genomes from the same...
bioRxiv Subject Collection: Evolutionary Biology
Thu Aug 13, 2020 03:00
Same-sex sexual behavior and selection for indiscriminate mating [NEW RESULTS]
The widespread presence of same-sex sexual behavior (SSB) has long been thought to pose an evolutionary conundrum [1-3], as participants in SSB suffer the cost of failing to reproduce after expending the time and energy to find a mate. The potential for SSB to occur as part of an optimal strategy has received almost no attention, although indiscriminate sexual behavior may be the ancestral mode of sexual reproduction [4]. Here, we build a simple model of sexual reproduction and create a theoretical...
bioRxiv Subject Collection: Evolutionary Biology
Thu Aug 13, 2020 03:00
Freshwater sponge hosts and their green algae symbionts: a tractable model to understand intracellular symbiosis [NEW RESULTS]
In many freshwater habitats, green algae form intracellular symbioses with a variety of heterotrophic host taxa including several species of freshwater sponge. These sponges perform important ecological roles in their habitats, and the poriferan:green algae partnerships offers unique opportunities to study the evolutionary origins and ecological persistence of endosymbioses. We examined the association between Ephydatia muelleri and its chlorophyte partner to identify features of host cellular and...
bioRxiv Subject Collection: Evolutionary Biology
Thu Aug 13, 2020 03:00

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