Does the experimental data provide support to the hypothesis that the morphological structure of the dance fly females render them more susceptible to entanglement in spider webs BIO360, Fall 2025 Computer Lab 6 Testing two way tables H Wagner, Biology UTM Computer Lab 6 Female ornaments hinder escape from spider webs in a dance fly Photo credit http bugguide net (1, 2), www4 ncsu eu (3) This case study was developed by Angela Khidhir based on a publication by Gwynne et al (2007) as part of a ROP399 with H Wagner Introduction The long tailed dance flies, Rhamphomyia longicauda, are a sex role reversed species where females compete for access to the males and thus expose themselves to predation risks The females have been observed to be caught more often in spider webs near mating swarm sites than males Gwynne et al (2007) have hypothesized that the reason behind this phenomenon is that the morphological structure of the females hinders their escape The females have rows of scales over the legs and abdominal sacs that inflate upon entry in a female competitive mating swarm, making the females more desirable to the males who ascend preferentially towards the large females Based on their hypothesis, Gwynne et al (2007) predicted that males, uninflated females and inflated females differ in their risk of getting entangled in spider webs To test the hypothesis, they conducted a study on the banks of the Credit River in Halton Country 276 trials were conducted over 10 days, with a different fly used each trial They used the spider webs of two species, one from genus Araneus and one from genus Coras Each fly was released from an insect net to fly towards a box of two square wood frames sandwiching a web A video camera was used to observe the flies The number of flies that escaped without touching the web, the number of flies that touched the web without entangling, and the number of flies that touched and became entangled were recorded There were no systematic differences in dance fly response to Araneus and Coras webs, hence the two data sets were pooled for this assignment

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Does the experimental data provide support to the hypothesis that the morphological structure of the dance fly females render them more susceptible to entanglement in spider webs  BIO360, Fall 2025 Computer Lab 6  Testing two way tables H  Wagner, Biology UTM Computer Lab 6  Female ornaments hinder escape from spider webs in a dance fly Photo credit  http   bugguide net (1, 2), www4 ncsu eu (3) This case study was developed by Angela Khidhir based on a publication by Gwynne et al  (2007) as part of a ROP399 with H  Wagner  Introduction The long tailed dance flies, Rhamphomyia longicauda, are a sex role reversed species where females compete for access to the males and thus expose themselves to predation risks  The females have been observed to be caught more often in spider webs near mating swarm sites than males  Gwynne et al  (2007) have hypothesized that the reason behind this phenomenon is that the morphological structure of the females hinders their escape  The females have rows of scales over the legs and abdominal sacs that inflate upon entry in a female competitive mating swarm, making the females more desirable to the males who ascend preferentially towards the large females  Based on their hypothesis, Gwynne et al  (2007) predicted that males, uninflated females and inflated females differ in their risk of getting entangled in spider webs  To test the hypothesis, they conducted a study on the banks of the Credit River in Halton Country  276 trials were conducted over 10 days, with a different fly used each trial  They used the spider webs of two species, one from genus Araneus and one from genus Coras  Each fly was released from an insect net to fly towards a box of two square wood frames sandwiching a web  A video camera was used to observe the flies  The number of flies that escaped without touching the web, the number of flies that touched the web without entangling, and the number of flies that touched and became entangled were recorded  There were no systematic differences in dance fly response to Araneus and Coras webs, hence the two data sets were pooled for this assignment

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