| 1. |
- Schaerer, Lukas, et al.
(författare)
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Anisogamy, chance and the evolution of sex roles
- 2012
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Ingår i: Trends in Ecology & Evolution. - : Elsevier BV. - 0169-5347 .- 1872-8383. ; 27:5, s. 260-264
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Tidskriftsartikel (refereegranskat)abstract
- Recently, several authors have challenged the view that anisogamy, the defining feature of the sexes, is an important determinant of the evolution of sex roles. Sex roles are instead suggested to result from chance, or from non-heritable differences in life histories of females and males. Here, we take issue with these ideas. We note that random processes alone cannot cause consistent differences between the sexes, and that those differences between the sexes in life histories that affect the sex roles are themselves the result of sex-specific selection that can ultimately be traced back to anisogamy. To understand sex roles, one should ask how environmental variation and female male coevolution cause variation in sex-specific selection in the light of anisogamy.
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| 2. |
- Wiberg, Axel, 1988-, et al.
(författare)
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Genome assemblies of the simultaneously hermaphroditic flatworms Macrostomum cliftonense and Macrostomum hystrix
- 2023
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Ingår i: G3. - 2160-1836. ; 13:9
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Tidskriftsartikel (refereegranskat)abstract
- The free-living, simultaneously hermaphroditic flatworms of the genus Macrostomum are increasingly used as model systems in various contexts. In particular, Macrostomum lignano, the only species of this group with a published genome assembly, has emerged as a model for the study of regeneration, reproduction, and stem-cell function. However, challenges have emerged due to M. lignano being a hidden polyploid, having recently undergone whole-genome duplication and chromosome fusion events. This complex genome architecture presents a significant roadblock to the application of many modern genetic tools. Hence, additional genomic resources for this genus are needed. Here, we present such resources for Macrostomum cliftonense and Macrostomum hystrix, which represent the contrasting mating behaviors of reciprocal copulation and hypodermic insemination found in the genus. We use a combination of PacBio long-read sequencing and Illumina shot-gun sequencing, along with several RNA-Seq data sets, to assemble and annotate highly contiguous genomes for both species. The assemblies span & SIM;227 and & SIM;220 Mb and are represented by 399 and 42 contigs for M. cliftonense and M. hystrix, respectively. Furthermore, high BUSCO completeness (& SIM;84-85%), low BUSCO duplication rates (8.3-6.2%), and low k-mer multiplicity indicate that these assemblies do not suffer from the same assembly ambiguities of the M. lignano genome assembly, which can be attributed to the complex karyology of this species. We also show that these resources, in combination with the prior resources from M. lignano, offer an excellent foundation for comparative genomic research in this group of organisms.
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