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1

Electronic Resource

Influence du groupement sur le développement chezEublaberus distanti (Dictyoptere, Ins.) (1983)

Rivault, Colette

Springer

Insectes sociaux 30 (1983), S. 210-220

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ISSN: 1420-9098

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Description / Table of Contents: Summary Density effects inEublaberus distanti have been tested upon larvæ in groups of 20, 100 and 500 individuals. Increased density leads to higher larval mortality, particularly in young larvæ, a larger difference between slow development and rapid development, and a decrease in adult size. Density effects in cockroaches can be explained in terms of population dynamics comparable to phasic modifications of desert Locusts.

Notes: Resume Les effets de la densité ont été testés sur des lots de larves de l'espèceEublaberus distanti, lots de 20, 100 et 500 individus par 615 cm2. Lorsque la densité augmente, la mortalité larvaire s'accroit, surtout chez les larves jeunes. L'augmentation de densité accentue les différences entre individus à développement rapide et développement plus lent, de même qu'elle implique une réduction de taille chez les adultes. Les effets de la densité s'expliquent par la dynamique de la régulation des populations de Blattes, comparable aux modifications phasaires des Acridiens migrateurs.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02223871

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2

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Food stealing in cockroaches (1990)

Rivault, Colette ; Cloarec, Ann

Springer

Journal of ethology 8 (1990), S. 53-59

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ISSN: 1439-5444

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract Relationships between food stealing and exploitation of main food sources were investigated in the German cockroach,Blattella germanica (L.) (Dictyoptera: Blattellidae). The occurrence of food stealing during food exploitation was associated with the course of depletion of the main food sources and not with spatial distribution or distance from shelter. Stolen pieces of food always appeared towards the end of exploitation of a food source. Their occurrence appeared to be a consequence of the exploitation of a food source rather than a specific strategy. The proportion of animals of different developmental stages observed with stolen pieces differed significantly from that in the general population. There were proportionally more males, females and large larvae and proportionally less small larvae with stolen pieces than on the main food source. These data suggest that stolen pieces appeared when competition for access to food increased, and that larger cockroaches (adults and larger larvae) were then dominant and benefited from monopolizing stolen pieces of food.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02350274

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3

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Cloarec, Ann ; Rivault, Colette

Springer

Journal of insect behavior 4 (1991), S. 661-673

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ISSN: 1572-8889

Keywords: cockroach ; Blattella germanica L. ; foraging ; age-related changes

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract The dynamics of exploitation of standard experimental food sources by the German cockroach, Blattella germanicaL. (Blattellidae), were analyzed in an urban habitat in relation to developmental stage. The data presented here stress differences in foraging capacities between small (first-and second-instar) larvae and animals of other developmental stages. The first animals to arrive in a food patch presented a developmental-stage distribution significantly different from that of the general population. Adults and large larvae (fifth and sixth instars) were the first to find food sources and, in particular, before small larvae. Significant differences appeared between developmental stages concerning givingup time and the time animals left a patch. Small larvae were significantly underrepresented in a patch just before food exhaustion but they were significantly more numerous than expected just after depletion. Small larvae remained in the vicinity of a depleted food dish longer than animals of other developmental stages. Adults left patches as soon as these were depleted, long before small larvae did. Developmental stage influenced rate of departure. These observations indicate that cockroaches improve their foraging performance as they grow larger.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01048077

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Distribution dynamics of Blattella germanica in a closed urban environment (1990)

Rivault, Colette

Springer

Entomologia experimentalis et applicata 57 (1990), S. 85-91

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ISSN: 1570-7458

Keywords: German cockroach ; Blattella germanica ; capture-recapture method ; spatial distribution

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Description / Table of Contents: Résumé Une population de Blattes (Blattella germanica) a été étudiée dans l'enceinte d'une piscine par des piégeages hebdomadaires. Les animaux adultes sont marqués et relachés dans leur zone de capture initiale. Le taux de recapture total est de 15%; mais on observe des differences en fonction de la zone de capture. Le taux de recapture est plus élevé dans les toilettes qu'en bordure des bassins. Par contre les distances entre capture et recapture y sont plus faibles. D'autre part, le taux de recapture est plus élevé dans la zone de capture initiale: seulement 15% des animaux changent de zone. Les déplacements ont lieu principalement entre deux zones voisines. Les recaptures dans la zone d'origine sont meilleures autour du petit bassin et dans les toilettes qu'autour du grand bassin. D'après ces résultats, il est possible de distinguer trois types de zone qui présentent un taux d'occupation plus ou moins élevé. Le taux d'occupation dans ces trois zones pourrait être lié à l'abondance des ressources telles que la nourriture et les abris. L'augmentation de la complexité de la structure du milieu qui augmente le nombre d'abris potentiels semble favoriser le développement des populations de Blattes. Celles-ci sont cependant capables d'adapter leur comportement avec les caractéristiques du milieu et de l'exploiter au mieux.

Notes: Abstract A population of Blattella germanica L. (Dictyoptera) cockroaches was studied in a swimming-bath. Trapped adults were marked and released in their capture area. The overall recapture rate was 15%, but it varied according to the capture area. This rate was higher in the toilets than around the pool borders. Distances between capture and recapture points also varied. Recaptures were more frequent in the capture area than in other areas; only 15% of the animals left their initial area. Movements occurred mainly between neighbouring areas. Recaptures in the capture area were lower around the large pool than around the shallow pool and in the toilets. In conclusion, there were three types of areas which were differently occupied. This could be explained by variations of resources like shelter and food. The complexity of the environmental structure favoured development of cockroach populations although they were able to modify their behavior in relation to the environmental features.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00349598

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5

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Spatial distribution of the cockroach, Blattella germanica, in a swimming-bath facility (1989)

Rivault, Colette

Springer

Entomologia experimentalis et applicata 53 (1989), S. 247-255

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ISSN: 1570-7458

Keywords: German cockroach ; Blattella germanica L. ; spatial distribution ; aggregate functioning

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Description / Table of Contents: Résumé L'étude d'une population de Blattella germanica L. dans une piscine par des piégeages hebdomadaires pendant une période de 50 semaines, nous a permis de suivre l'évolution spatiale et temporelle de cette population. Les résultats des piégeages étudiés par Analyse Factorielle des Correspondances nous permettent de conclure à une certaine stabilité temporelle de la population. Elle se répartit en larges agrégats dans lesquels s'inscrit un mouvement circulaire, allant du centre vers la périphérie et retour, qui se superpose au cycle de développement des individus.

Notes: Abstract A population of Blattella germanica L. was studied in a swimming-bath facility using a sampling method. A set of traps deposited weekly, over a period of 50 weeks, allowed us to follow the variations of the temporal and spatial distributions of the population inside the building. A Factorial Correspondance Analysis, performed on the data, led us to the conclusion that the population was stable in time. The spatial distribution of the insects was contiguous. Inside an aggregate, we were able to define a circular movement from the center towards the periphery and vice versa; this movement can be superimposed up on the biological development on the individuals. After birth in the middle of the aggregate, during development, larvae explore further a field as far as the border of the aggregate; this exploratory phase, related to foraging behavior or search for new shelters when these become limiting factors, could be considered as the spreading phase of the population. Then, with the imminence of the imaginal moult, old larvae tend to gather in high density areas in the middle of the aggregate. Newly molted adults look for a sexual partner. And finally females remain in the shelters during oothecae maturation.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00162856

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