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Do simultaneous hermaphrodites choose their mates? Effects of body size in a planarian flatworm
1. We tested whether or not the simultaneous hermaphrodite Dugesia polychroa mates randomly with respect to partner size, a strong indicator of female fecundity. 2. The number and duration ofExpand
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Protist-Type Lysozymes of the Nematode Caenorhabditis elegans Contribute to Resistance against Pathogenic Bacillus thuringiensis
Pathogens represent a universal threat to other living organisms. Most organisms express antimicrobial proteins and peptides, such as lysozymes, as a protection against these challenges. The nematodeExpand
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Sperm exchange in a simultaneous hermaphrodite
Abstract Many simultaneously hermaphroditic animals cross-inseminate when copulating, even though unilateral sperm exchange is functionally possible. The question is why reciprocity is the rule. ThisExpand
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Sexual adaptations to high density in hermaphrodites
Summary Hermaphrodites are generally seen as species adapted to conditions of low mate availability. This is primarily because hermaphrodites can adjust allocation of resources to each sex functionExpand
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High Fecundity and Low Fertility in Parthenogenetic Planarians
In hermaphrodites, the cost of sexuality can favor the spread of parthenogenesis in two ways. First, it can promote higher female fecundity in parthenogens that have reduced allocation to the maleExpand
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Parthenogenetic lineages that arise in a hermaphroditic, sexual population will inherit the male function from their sexual progenitors. Natural selection then acts to reduce male allocation of theExpand
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Spatial and ecological overlap between coexisting sexual and parthenogenetic Schmidtea polychroa (Tricladida; Platyhelminthes)
Theoretical models on the costs and benefits of sexual reproduction usually assume that sexual and parthenogenetic individuals coexist and are identical, except for their mode of reproduction.Expand
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The influence of Monocystis sp. infection on growth and mating behaviour of the earthworm Lumbricus terrestris
Parasites are capable of behavioural manipulation of their hosts in an effort to complete their life cycle and thus increase their fitness at a cost to the host. Hosts are therefore expected toExpand
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Reproductive modes, ploidy distribution, and supernumerary chromosome frequencies of the flatworm Polycelis nigra (Platyhelminthes: Tricladida)
The hermaphroditic flatworm, Polycelis nigra, is characterized by two reproductive biotypes which differ with respect to ploidy; sexual individuals are diploid (n = 8, 2× = 16) and pseudogamousExpand
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Evidence for lack of inbreeding avoidance by selective mating in a simultaneous hermaphrodite
In the many species in which breeding between close kin yields deleterious effects (inbreeding depression), outbreeding is promoted by various mechanisms, such as kin recognition and, inExpand
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