Allocation of more reproductive resource to egg size rather than clutch size of gregarious desert locust (Schistocerca gregaria) through increasing oogenesis period and oosorption rate
The desert locust, Schistocerca gregaria, shows a density-dependent reproductive trade-off by laying fewer but larger eggs in crowded conditions (gregarious phase) than in isolated conditions (solitarious phase). However, the physiological mechanisms controlling reproductive resource allocation remain unclear. We examined how egg production processes, including ovulation timing (i.e., oogenesis period), oocyte and ovarian growth rates, and oosorption rate (resorbing developing terminal oocytes), regulate reproductive outputs (egg biomass per clutch, egg size, and clutch size) during a reproductive cycle in S. gregaria by rearing them either under isolated or crowded conditions. We observed a common density-dependent negative correlation between egg size and clutch size, with no significant difference in egg biomass between the two rearing conditions. Dissection of female locusts after different days of oviposition revealed that the daily oocyte growth rate was almost similar between the two rearing conditions, but crowd-reared females ovulated later than isolated-reared ones, resulting in further oocyte growth in the former. Terminal oocytes were renewed by previous penultimate oocytes at the onset of a new reproductive cycle, and oosorption mainly occurred at an early stage in both rearing conditions; however, crowd-reared locusts displayed higher levels of oosorption compared to their isolated-reared counterparts. Crowding induced a high oosorption rate, resulting in a reduced clutch size and a prolonged oogenesis period, which in turn allowed oocytes to intake more yolk, which was probably recycled via oosorption. These results suggest that the length of the oogenesis period and oosorption rate are manipulated by maternal density, and these physiological modifications interactively regulate reproductive trade-off in S. gregaria.
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Subjects: | H10 - Ravageurs des plantes, L53 - Physiologie animale - Reproduction, ravageur des plantes, physiologie animale, comportement reproductif, reproduction animale, Schistocerca gregaria, ovogénèse, http://aims.fao.org/aos/agrovoc/c_16196, http://aims.fao.org/aos/agrovoc/c_25187, http://aims.fao.org/aos/agrovoc/c_37902, http://aims.fao.org/aos/agrovoc/c_5d5904a8, http://aims.fao.org/aos/agrovoc/c_31931, http://aims.fao.org/aos/agrovoc/c_5360, |
Online Access: | http://agritrop.cirad.fr/599980/ http://agritrop.cirad.fr/599980/1/PUB727.pdf |
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dig-cirad-fr-5999802024-01-29T19:01:27Z http://agritrop.cirad.fr/599980/ http://agritrop.cirad.fr/599980/ Allocation of more reproductive resource to egg size rather than clutch size of gregarious desert locust (Schistocerca gregaria) through increasing oogenesis period and oosorption rate. Maeno Koutaro Ould, Piou Cyril, Ghaout Saïd. 2022. Journal of Insect Physiology, 136:104331, 13 p.https://doi.org/10.1016/j.jinsphys.2021.104331 <https://doi.org/10.1016/j.jinsphys.2021.104331> Allocation of more reproductive resource to egg size rather than clutch size of gregarious desert locust (Schistocerca gregaria) through increasing oogenesis period and oosorption rate Maeno, Koutaro Ould Piou, Cyril Ghaout, Saïd eng 2022 Journal of Insect Physiology H10 - Ravageurs des plantes L53 - Physiologie animale - Reproduction ravageur des plantes physiologie animale comportement reproductif reproduction animale Schistocerca gregaria ovogénèse http://aims.fao.org/aos/agrovoc/c_16196 http://aims.fao.org/aos/agrovoc/c_25187 http://aims.fao.org/aos/agrovoc/c_37902 http://aims.fao.org/aos/agrovoc/c_5d5904a8 http://aims.fao.org/aos/agrovoc/c_31931 http://aims.fao.org/aos/agrovoc/c_5360 The desert locust, Schistocerca gregaria, shows a density-dependent reproductive trade-off by laying fewer but larger eggs in crowded conditions (gregarious phase) than in isolated conditions (solitarious phase). However, the physiological mechanisms controlling reproductive resource allocation remain unclear. We examined how egg production processes, including ovulation timing (i.e., oogenesis period), oocyte and ovarian growth rates, and oosorption rate (resorbing developing terminal oocytes), regulate reproductive outputs (egg biomass per clutch, egg size, and clutch size) during a reproductive cycle in S. gregaria by rearing them either under isolated or crowded conditions. We observed a common density-dependent negative correlation between egg size and clutch size, with no significant difference in egg biomass between the two rearing conditions. Dissection of female locusts after different days of oviposition revealed that the daily oocyte growth rate was almost similar between the two rearing conditions, but crowd-reared females ovulated later than isolated-reared ones, resulting in further oocyte growth in the former. Terminal oocytes were renewed by previous penultimate oocytes at the onset of a new reproductive cycle, and oosorption mainly occurred at an early stage in both rearing conditions; however, crowd-reared locusts displayed higher levels of oosorption compared to their isolated-reared counterparts. Crowding induced a high oosorption rate, resulting in a reduced clutch size and a prolonged oogenesis period, which in turn allowed oocytes to intake more yolk, which was probably recycled via oosorption. These results suggest that the length of the oogenesis period and oosorption rate are manipulated by maternal density, and these physiological modifications interactively regulate reproductive trade-off in S. gregaria. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/599980/1/PUB727.pdf text Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1016/j.jinsphys.2021.104331 10.1016/j.jinsphys.2021.104331 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jinsphys.2021.104331 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1016/j.jinsphys.2021.104331 |
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H10 - Ravageurs des plantes L53 - Physiologie animale - Reproduction ravageur des plantes physiologie animale comportement reproductif reproduction animale Schistocerca gregaria ovogénèse http://aims.fao.org/aos/agrovoc/c_16196 http://aims.fao.org/aos/agrovoc/c_25187 http://aims.fao.org/aos/agrovoc/c_37902 http://aims.fao.org/aos/agrovoc/c_5d5904a8 http://aims.fao.org/aos/agrovoc/c_31931 http://aims.fao.org/aos/agrovoc/c_5360 H10 - Ravageurs des plantes L53 - Physiologie animale - Reproduction ravageur des plantes physiologie animale comportement reproductif reproduction animale Schistocerca gregaria ovogénèse http://aims.fao.org/aos/agrovoc/c_16196 http://aims.fao.org/aos/agrovoc/c_25187 http://aims.fao.org/aos/agrovoc/c_37902 http://aims.fao.org/aos/agrovoc/c_5d5904a8 http://aims.fao.org/aos/agrovoc/c_31931 http://aims.fao.org/aos/agrovoc/c_5360 |
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H10 - Ravageurs des plantes L53 - Physiologie animale - Reproduction ravageur des plantes physiologie animale comportement reproductif reproduction animale Schistocerca gregaria ovogénèse http://aims.fao.org/aos/agrovoc/c_16196 http://aims.fao.org/aos/agrovoc/c_25187 http://aims.fao.org/aos/agrovoc/c_37902 http://aims.fao.org/aos/agrovoc/c_5d5904a8 http://aims.fao.org/aos/agrovoc/c_31931 http://aims.fao.org/aos/agrovoc/c_5360 H10 - Ravageurs des plantes L53 - Physiologie animale - Reproduction ravageur des plantes physiologie animale comportement reproductif reproduction animale Schistocerca gregaria ovogénèse http://aims.fao.org/aos/agrovoc/c_16196 http://aims.fao.org/aos/agrovoc/c_25187 http://aims.fao.org/aos/agrovoc/c_37902 http://aims.fao.org/aos/agrovoc/c_5d5904a8 http://aims.fao.org/aos/agrovoc/c_31931 http://aims.fao.org/aos/agrovoc/c_5360 Maeno, Koutaro Ould Piou, Cyril Ghaout, Saïd Allocation of more reproductive resource to egg size rather than clutch size of gregarious desert locust (Schistocerca gregaria) through increasing oogenesis period and oosorption rate |
description |
The desert locust, Schistocerca gregaria, shows a density-dependent reproductive trade-off by laying fewer but larger eggs in crowded conditions (gregarious phase) than in isolated conditions (solitarious phase). However, the physiological mechanisms controlling reproductive resource allocation remain unclear. We examined how egg production processes, including ovulation timing (i.e., oogenesis period), oocyte and ovarian growth rates, and oosorption rate (resorbing developing terminal oocytes), regulate reproductive outputs (egg biomass per clutch, egg size, and clutch size) during a reproductive cycle in S. gregaria by rearing them either under isolated or crowded conditions. We observed a common density-dependent negative correlation between egg size and clutch size, with no significant difference in egg biomass between the two rearing conditions. Dissection of female locusts after different days of oviposition revealed that the daily oocyte growth rate was almost similar between the two rearing conditions, but crowd-reared females ovulated later than isolated-reared ones, resulting in further oocyte growth in the former. Terminal oocytes were renewed by previous penultimate oocytes at the onset of a new reproductive cycle, and oosorption mainly occurred at an early stage in both rearing conditions; however, crowd-reared locusts displayed higher levels of oosorption compared to their isolated-reared counterparts. Crowding induced a high oosorption rate, resulting in a reduced clutch size and a prolonged oogenesis period, which in turn allowed oocytes to intake more yolk, which was probably recycled via oosorption. These results suggest that the length of the oogenesis period and oosorption rate are manipulated by maternal density, and these physiological modifications interactively regulate reproductive trade-off in S. gregaria. |
format |
article |
topic_facet |
H10 - Ravageurs des plantes L53 - Physiologie animale - Reproduction ravageur des plantes physiologie animale comportement reproductif reproduction animale Schistocerca gregaria ovogénèse http://aims.fao.org/aos/agrovoc/c_16196 http://aims.fao.org/aos/agrovoc/c_25187 http://aims.fao.org/aos/agrovoc/c_37902 http://aims.fao.org/aos/agrovoc/c_5d5904a8 http://aims.fao.org/aos/agrovoc/c_31931 http://aims.fao.org/aos/agrovoc/c_5360 |
author |
Maeno, Koutaro Ould Piou, Cyril Ghaout, Saïd |
author_facet |
Maeno, Koutaro Ould Piou, Cyril Ghaout, Saïd |
author_sort |
Maeno, Koutaro Ould |
title |
Allocation of more reproductive resource to egg size rather than clutch size of gregarious desert locust (Schistocerca gregaria) through increasing oogenesis period and oosorption rate |
title_short |
Allocation of more reproductive resource to egg size rather than clutch size of gregarious desert locust (Schistocerca gregaria) through increasing oogenesis period and oosorption rate |
title_full |
Allocation of more reproductive resource to egg size rather than clutch size of gregarious desert locust (Schistocerca gregaria) through increasing oogenesis period and oosorption rate |
title_fullStr |
Allocation of more reproductive resource to egg size rather than clutch size of gregarious desert locust (Schistocerca gregaria) through increasing oogenesis period and oosorption rate |
title_full_unstemmed |
Allocation of more reproductive resource to egg size rather than clutch size of gregarious desert locust (Schistocerca gregaria) through increasing oogenesis period and oosorption rate |
title_sort |
allocation of more reproductive resource to egg size rather than clutch size of gregarious desert locust (schistocerca gregaria) through increasing oogenesis period and oosorption rate |
url |
http://agritrop.cirad.fr/599980/ http://agritrop.cirad.fr/599980/1/PUB727.pdf |
work_keys_str_mv |
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_version_ |
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