Talk:Stegodyphus lineatus

Comment Section

Polygamy: It might be helpful to better describe how the section on genetic variation and mating directly relates to polygamy. You might be able to do this by describing how genetic variation may exist in the different environments that this spider is found and how this affects mating patterns. Emiliaromagna1 (talk)

Comments by Krishna Vangipuram (Krish707)

Overall, I believed this article contained a lot of interesting information. Originally, this section was completely one large paragraph, which made it difficult to comprehend the material. In order to better improve this article, I primarily consolidated the information in this section in four main sub-sections: Polyandrous Behavior, Fitness Benefits of Polyandrous Behavior, Fitness Consequences of Polyandrous Behavior, and Mate Search and Reproductive Success. I also added paragraph headings and moved consolidated relevant information under each paragraph heading (I moved text around). Krish707 (talk)

In terms of sentence structure, I introduced transitions in two paragraph headings, to better improve the flow of information. For example, under the Infanticide from a Female Perspective heading, I added an introductory sentence, which introduced the topic of infanticide. Under the Infanticide from a Male Perspective heading, I also added an introductory sentence, which introduced the main reason why infanticide increases an individual male’s fitness. Krish707 (talk)

In terms of content, I primarily added some background information regarding the geographic distribution of the spider and the type of prey it captures. In addition, based on my own research, I expanded on the topic of genetic compatibility in terms of multiple mating. I cited an experiment in which it was shown that although multiple mating increases the likelihood of genetic compatibility, it did not contribute to an increase in population size over generations (hence it is not a fitness advantage). Krish707 (talk)

It was a very good article in general and I learned a lot from it! In the future, I would mostly focus on using more headings to consolidate information and adding paragraph headings to help the reader get a sense as to what each body paragraph is about. I would also recommend to clarify certain details mentioned, such as mentioning that genetic compatibility actually does not necessarily have to increase the fitness of a population. Krish707 (talk)

Polyandry in Stegodyphus lineatus Peer Review Comments by Shannon Tai

The additional titles and headings looked good. I added an additional section of “Increased Genetic Diversity” to further the discussion on the fitness benefits of polyandrous behavior. I summarized the results of the study with a proper citation. Shannon.tai (talk) —Preceding undated comment added 06:21, 26 October 2015 (UTC)

Polygamy in Stegodyphus lineatus information

Hey I changed some stuff around on your section. Sluology (talk) 06:23, 26 October 2015 (UTC) I also switched the sections so that maternal care would be its own section. The last paragraph on genetic variation is rather vague. I was not sure what to add on there. Maybe some more detail? Sluology (talk) 06:23, 26 October 2015 (UTC)

Added by EVO1995

The desert spider shows low rates of polygamy,[5] but sexual selection and environmental cues play an important role during mate search and reproductive success.

Sexual Selection The high rates of sexual selection allow phenotypes to change, which allow populations of these spiders to evolve. The selected traits during sexual selection helped males since the ones who could find females faster were at an advantage in contrast to those males lacking those traits acquired through sexual selection.[5] Sexual selection allows males to receive receptivity signals from females, in the form of pheromones which are detected by the males. Mature females let off a pheromone to reduce their attractiveness towards males due to the high costs of re-mating for the egg sac (infanticide mentioned above).[15] Mature females are aggressive towards males because loss of eggs is costly, although multiple mating can increase the likelihood of genetic compatibility in embryo formation. It is important to note that although multiple mating can increase the likelihood of genetic compatibility, it cannot be considered a major fitness advantage. According to an experiment performed by L. Bennett, A. Pai, and G. Yan, the increased viability of embryos—due to increased genetic compatibility—did not significantly increase the number of individuals in the population over time, and therefore, did not play a significant role in the fitness of the overall population.[16] Male receive 50% success of fertilizing eggs in mature females than virgin females who may have not reached maturation yet.[15] Since males mature on average 16 days earlier than females, they encounter virgin females frequently, but these immature females are not mature enough to allow the egg sac to mature.[17]

Environmental Cues Environmental cues, for example the seasons progressing, decrease the rate at which a male encounters virgins and increases high paternity gain through encounters with mature females.[15] Since males mature earlier than the females, they migrate to other nests to look for females in order to fertilize eggs and increase paternity, this allows genetic variation to take place in populations, alongside inbreeding which also takes place amongst this species.[5] Cost of inbreeding are low, and females show no avoidance to this behaviour. If inbreeding avoidance mechanisms would increase, it would be the result from kin mating to increase and this pattern has not been observed amongst individuals in this species.[17] Since inbreeding does occur, but at low rates, random mating allows genetic diversity to occur.

Genetic Variation and Mating Evidence of multiple mating is found for this species, and genetic variation is likely due to multiple fathers alongside male infanticide rates being high and re-mating in a natural population. The species allow random mating due to the single females colonizing new nesting sites and male migration from other nests.[20] Female dispersal has shown to have more impact when enhancing genetic differences amongst offspring in a population. Environments of spiders should be taken into consideration when studying the structure of a population, especially with S.lineatus that reside in stable and unstable conditions. In some instances, populations of spiders interbreed due to movement of juveniles.[20] Juveniles settle in the maternal nests where they later mate, introducing clusters of siblings in a nest. Migration although, can counteract the costs of interbreeding by males from other nests. This in turn promotes genetic differentiation. It is observed that amongst populations, philopatry and founder events allows some individuals to live and others to go extinct, in result enhancing genetic variance among mating groups. When siblings, males or females disperse to nearby nests, this allows for random mating to occur which will enhance the differentiation amongst spiders in the following generation.

Comments

Hey, I changed some stuff around on your section. I also switched the sections so that maternal care would be its own section. The last paragraph on genetic variation is rather vague. I was not sure what to add on there. Maybe some more detail? All in all it was a good article especially considering how limited you were on polygamy Sluology (talk) 06:51, 26 October 2015 (UTC)