Effets inhibiteurs de la présence d'un congénère sur la maturation des ovocytes chez Acanthoscelides obtectus Say (Coléoptère: Bruchidae)

1983 ◽  
Vol 61 (10) ◽  
pp. 2329-2337 ◽  
Author(s):  
Jean-Claude Biémont ◽  
Marc Jarry
Keyword(s):  
Oocyte Maturation ◽  
Geographical Area ◽  
Egg Laying ◽  
Acanthoscelides Obtectus ◽  
Two Generations ◽  
Large Geographical Area ◽  
Adaptive Role ◽  
Old Females ◽  
Acanthoscelides Obtectus Say

The bean weevil Acanthoscelides obtectus, which is found over a large geographical area, can live in habitats where its host plant is not continuously available throughout the year. In such cases, the females must wait for favorable egg-laying conditions during part of the year. Individuals of this species may concentrate in temporary shelters such as dry leaves for example. The effect of the grouping of two individuals (female and male; female and female) on the reproductive physiology of females from a Cuban strain led to an inhibition or a decrease in oogenesis. This phenomenon was also observed when a female cohabited with a male whose aedeagus had been removed. However, oocyte maturation was stimulated when 4-day-old females were placed in the presence of a male for 4 h. The variability observed between two generations is discussed along with the often neglected role of relationships among individuals. The adaptive role of the inhibition of oocyte maturation induced by the grouping of two individuals is discussed.

Analyse Experimentale Du Role De L'Ovitube Dans Le Comportement De Ponte De La Bruche Du Haricot (Acanthoscelides Obtectus Say- Coleoptera, Bruchidae)

Behaviour ◽  
1975 ◽  
Vol 54 (3-4) ◽  
pp. 258-277 ◽  
Author(s):  
Jean Pouzat
Keyword(s):  
Mechanical Stimulus ◽  
Egg Laying ◽  
Acanthoscelides Obtectus ◽  
The One ◽  
The Relationship ◽  
Acanthoscelides Obtectus Say ◽  
Egg Laying Behaviour ◽  
Made In ◽  
Important Stimulus

AbstractA resume is made of the major sequences of egg-laying behaviour, both in nature and on stored seeds, of the bean weevil. An experimental analysis of the role of the ovipositor in the act of egg-laying is then undertaken by simple techniques. It is observed that an important stimulus, with respect to this, is mechanical in nature: resulting from contact between the setae of the ovipositor on the one hand, and the seed and the "ground" on the other. Simply suspending the seed instead of leaving it lie on the cage bottom, suffices to reduce egg-laying and production significantly. Examination of egg-laying, when the substratum furnished is a trellis with suitable sized mesh, shows that an important aspect of the mechanical stimulus is in its concentrical character, i.e., the fact that it is applied to a greater number of setae all around the ovipositor. The result enables us to understand better the behaviour in nature, where there is a boring of the bean pod followed by egg-laying inside that pod through through the hole made. In the course of the paper some connected problems are evoked: - The relationship between egg-laying and production; - The more or less necessary character of the succession of the different sequences in egg-laying behaviour. Existence of intermediary cases, between individuals which can lay eggs only in the pod and those laying in the apparent absence of any stimulus, particularly stimuli connected with the bean; - Links between the phytophage and its host, remarks on the apparently unfavourable peculiarity of laying a great number of eggs in the same place, the possible consequences with respect to population dynamics.

Comportement sexuel et stratégie reproductrice chez le Chryseida bennetti Burks (Hymenoptera: Eurytomidae), parasitoïde de la bruche du haricot. I. Effet de l'âge des partenaires

1994 ◽  
Vol 72 (1) ◽  
pp. 126-134 ◽  
Author(s):  
Gabriela Pérez-Lachaud ◽  
Mireille Campan
Keyword(s):  
Courtship Behavior ◽  
Pupal Stage ◽  
The Other ◽  
Acanthoscelides Obtectus ◽  
Female Age ◽  
Comportement Sexuel ◽  
Guarding Behavior ◽  
Multiple Matings ◽  
Old Females ◽  
Acanthoscelides Obtectus Say

This paper relates a female age effect to the mating behavior of Chryseida bennetti Burks, an ectoparasitoid of the bean weevil (Acanthoscelides obtectus (Say)). The sexual behavior includes rapid courtship and copulation followed by a postmating courtship behavior ("guarding"). Male guarding behavior varies according to the females' age, with males guarding females of 2–3 days old longer than younger and older females. A period of sexual maturation is necessary for most of the males. Females' attractiveness begins at the pupal stage, and their receptivity on emergence. Mated females are still attractive to males. Multiple matings (up to four copulations) with the same male have been observed. The females' age seems to control copulation frequency and the duration of the postmating courtship behavior. Two- and three-day-old females had more successive multiple matings with the same male than the other females did, and males spent much more time guarding them. The age of the males (except from newly emerged males) did not seem to influence copulation frequency. On the other hand, the complexity of the sequential courtship behavior increased with the age of the partners. The function of males' postmating courtship is discussed.

Adaptive Role of Lipids in Algae under Metal Ions Impact (a Review)

2018 ◽  
Vol 54 (6) ◽  
pp. 78-93
Author(s):  
V. V. Grubinko ◽  
O. I. Bodnar ◽  
A. I. Lutsiv ◽  
G. B. Viniarska
Keyword(s):  
Metal Ions ◽  
Adaptive Role

Social Cohesion, Breaks, and Transformations in Italy, 535–600

2018 ◽  
Author(s):  
Walter Pohl
Keyword(s):  
The Political ◽  
Late Antique ◽  
Religious Context ◽  
Ancient Society ◽  
Complex Process ◽  
Term Change ◽  
Two Generations ◽  
Classical Culture

When the Gothic War began in Italy in 535, the country still conserved many features of classical culture and late antique administration. Much of that was lost in the political upheavals of the following decades. Building on Chris Wickham’s work, this contribution sketches an integrated perspective of these changes, attempting to relate the contingency of events to the logic of long-term change, discussing political options in relation to military and economic means, and asking in what ways the erosion of consensus may be understood in a cultural and religious context. What was the role of military entrepreneurs of more or less barbarian or Roman extraction in the distribution or destruction of resources? How did Christianity contribute to the transformation of ancient society? The old model of barbarian invasions can contribute little to understanding this complex process. It is remarkable that for two generations, all political strategies in Italy ultimately failed.

scholarly journals Interactions between the WEE-1.3 kinase and the PAM-1 aminopeptidase in oocyte maturation and the early C. elegans embryo

2021 ◽  
Author(s):  
Dorothy Benton ◽  
Eva C Jaeger ◽  
Arielle Kilner ◽  
Ashley Kimble ◽  
Josh Lowry ◽  
...  
Keyword(s):  
Missense Mutation ◽  
Oocyte Maturation ◽  
Protective Role ◽  
C Elegans ◽  
Direct Target ◽  
The One ◽  
Actomyosin Cytoskeleton ◽  
Embryonic Viability ◽  
Anterior Posterior

Abstract Puromycin-sensitive aminopeptidases are found across phyla and are known to regulate the cell-cycle and play a protective role in neurodegenerative disease. PAM-1 is a puromycin-sensitive aminopeptidase important for meiotic exit and polarity establishment in the one-cell Caenorhabditis elegans embryo. Despite conservation of this aminopeptidase, little is known about its targets during development. In order to identify novel interactors, we conducted a suppressor screen and isolated four suppressing mutations in three genes that partially rescued the maternal-effect lethality of pam-1 mutants. Suppressed strains show improved embryonic viability and polarization of the anterior-posterior axis. We identified a missense mutation in wee-1.3 in one of these suppressed strains. WEE-1.3 is an inhibitory kinase that regulates maturation promoting factor. While the missense mutation suppressed polarity phenotypes in pam-1, it does so without restoring centrosome-cortical contact or altering the cortical actomyosin cytoskeleton. To see if PAM-1 and WEE-1.3 interact in other processes, we examined oocyte maturation. While depletion of wee-1.3 causes sterility due to precocious oocyte maturation, this effect was lessened in pam-1 worms, suggesting that PAM-1 and WEE-1.3 interact in this process. Levels of WEE-1.3 were comparable between wild-type and pam-1 strains, suggesting that WEE-1.3 is not a direct target of the aminopeptidase. Thus, we have established an interaction between PAM-1 and WEE-1.3 in multiple developmental processes and have identified suppressors that are likely to further our understanding of the role of puromycin-sensitive aminopeptidases during development.

scholarly journals 88: Effectiveness of Therapeutic Hypothermia on Transport within a Large Geographical Area

2015 ◽  
Vol 20 (5) ◽  
pp. e66-e66
Author(s):  
S Redpath ◽  
B Lemyre ◽  
H Moore ◽  
J Ponnuthurai ◽  
J Chan ◽  
...  
Keyword(s):  
Therapeutic Hypothermia ◽  
Geographical Area ◽  
Large Geographical Area
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