Effects of Age, Phase Variation and Pheromones on Male Sperm Storage in the Desert Locust, Schistocerca gregaria
| Autor: | Tomoko Ganaha-Kikumura, Gadi V. P. Reddy, Takayuki Mitsunaga, Satoshi Hiroyoshi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
0301 basic medicine endocrine system media_common.quotation_subject Science testis 01 natural sciences sperm Andrology reproduction 03 medical and health sciences Seminal vesicle medicine seminal vesicle Mating reproductive and urinary physiology media_common biology urogenital system Vas deferens biology.organism_classification Sperm 010602 entomology 030104 developmental biology medicine.anatomical_structure Insect Science Sex pheromone Schistocerca Reproduction Locust vas deferens |
| Zdroj: | Insects, Vol 12, Iss 642, p 642 (2021) Insects Volume 12 Issue 7 |
| ISSN: | 2075-4450 |
| Popis: | In general, sperm produced in the testis are moved into the seminal vesicle via the vas deferens in insects, where they are stored. How this sperm movement is controlled is less well understood in locusts or grasshoppers. In this study, the effects of age, phase variation and pheromones on male sperm storage were investigated in the desert locust, Schistocerca gregaria (Forskål). In this locust, a pair of ducts, the vasa deferentia, connect the testes to a pair of the long, slender seminal vesicles that are folded approximately thirty times, and where the sperm are stored. We found that phase variation affected the level of sperm storage in the seminal vesicle. Moreover, adult males that detected pheromones emitted by mature adult males showed enhanced sperm storage compared with males that received the pheromones emitted from nymphs: The former, adult male pheromones are known to promote sexual maturation of immature adults of both sexes, whereas the latter, nymphal pheromones delay sexual maturation. Most mature adult males had much sperm in the vasa deferentia at all times examined, suggesting daily sperm movement from the testes to the seminal vesicles via the vasa deferentia. As adult males aged, sperm were accumulated from the proximal part to the distal end of the seminal vesicle. Many sperm remained in the seminal vesicle after mating. These results suggest that young or new sperm located near the proximal part of the seminal vesicle could be used for mating, whereas old sperm not used for mating are stored in the distal part of the seminal vesicle. |
| Databáze: | OpenAIRE |
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