acta ethologica

article

Socialization in spectacled parrotlets (Forpus conspicillatus): how juveniles compensate for the lack of siblings

R. Wanker

acta ethologica > 2000 > 2 > 1 > 23-28

AbstractSocialization, that is, the process of the integration of an individual into the social system and the acquisition of basic social traits, has been studied in a variety of vertebrate species. Deprivation experiments have shown that the lack of early affiliative relationships has negative long-term effects on social behaviour and reproduction. Most studies emphasized the importance of the mother-infant...

article

The effects of kinship and density on growth and metamorphosis of the bronze frog (Ranatemporalis) tadpoles

S. Girish, S. K. Saidapur

acta ethologica > 2000 > 2 > 1 > 61-66

AbstractFive clutches of Ranatemporalis eggs collected along a stream were reared separately until formation of Gosner stage 25 tadpoles. The effect of kinship and density was then studied by rearing ten siblings in 1 (sib 1) or 5 (sib 5) l water, and mixed rearing of ten tadpoles (2 from each of the 5 clutches) in 1 (mix 1) or 5 (mix 5) l water; each group replicated five times. In all the groups...

article

Nocturnal orientation of robins, Erithacus rubecula: birds caught during migratory flight are disoriented

R. Muheim, L. Jenni

acta ethologica > 2000 > 2 > 1 > 43-50

AbstractFor conventional experiments on the orientation behavior of migrant birds in funnels, either hand-raised birds or birds caught during resting periods at stopover sites are generally used. Topographic circumstances at the Alpine pass Col de Bretolet at the Switzerland/France border allow the capture of birds during active migratory flight during the whole night. These birds are in full migratory...

article

An integrative approach to sex change: social, behavioural and neurochemical changes in Lythrypnus dalli (Pisces)

R. H. Reavis, M. S. Grober

acta ethologica > 2000 > 2 > 1 > 51-60

Abstract. This study examined three aspects of protogynous sex change in Lythrypnus dalli (Gobiidae): (1) social influences on the rate of sex change, (2) the sequence of behavioural changes, and (3) neuroendocrine changes. Social groups consisted of either four females, or four females with a male who was subsequently removed. Sex change occurred most rapidly in male- removed groups when the sex...

article

Honesty of agonistic signalling and effects of size and motivation asymmetry in contests

J. S. Kotiaho, R. V. Alatalo, J. Mappes, S. Parri

acta ethologica > 2000 > 2 > 1 > 13-21

AbstractGame theoretical models predict that the main function of fighting behaviour is to assess the relative fighting ability of opponents. The sequential assessment game has often been used to investigate contests, while honest signalling theory has received much less attention. With the wolf spider Hygrolycosa rubrofasciata we investigated whether male agonistic signalling can reveal honest information...

article

Some properties of a pheromone allowing individual recognition, from the scats of an Australian lizard, Egernia striolata

C. M. Bull, C. L. Griffin, M. V. Perkins

acta ethologica > 2000 > 2 > 1 > 35-42

AbstractThe Australian lizard, Egernia striolata, can distinguish its own scats from those of unfamiliar conspecific individuals. This appears to be unrelated to diet, because there is no difference in the response to scats from unfamiliar lizards fed on diets that are the same or different from the test lizard. The signal that induces the response is not a visual or tactile property of scat structure,...

article

Refuge use by fish as a function of body weight changes

J. Krause, S. P. Loader, E. Kirkman, G. D. Ruxton

acta ethologica > 2000 > 2 > 1 > 29-34

AbstractRefuge use provides a good model for the study of trade-offs between the benefits of predator avoidance and the costs of lost feeding opportunities. We manipulated the latter costs by subjecting similar-sized three-spine sticklebacks to 2 days of food deprivation followed by a 2-day re-feeding period and recorded associated changes in body weight and refuge use. Food deprivation resulted in...

article

Child social ethology and peer relations: a developmental review of methodology and findings

A. J. Santos, L. T. Winegar

acta ethologica > 2000 > 2 > 1 > 1-11

Abstract During the last three decades, developmental research has increasingly emphasized the relevance of peer relations in childrens socialization. However, most studies of child development still focus upon individual differences in social status, tacitly neglecting relational constraints inherent in the ecology of the peer group. In contrast, socioethological approaches have stressed that natural...

article

Male display characters, gonadal maturation and androgens in the cichlid fish Oreochromis mossambicus

R. F. Oliveira, V. C. Almada

acta ethologica > 2000 > 2 > 1 > 67-70

AbstractThe relationships between gonadal maturation and the expression of behavioral and morphological display characters in O. mossambicus was investigated and the possible role of androgens in the coordination of this process was evaluated using genital papilla size as a bioassay for androgen levels. Morphological and behavioral displaying characters were found to be correlated among themselves...

article

Is maternal behavior correlated with later explorative behavior of young guinea pigs (Cavia aperea f. porcellus)?

P. C. H. Albers, P. J. A. Timmermans, J. M. H. Vossen

acta ethologica > 2000 > 2 > 2 > 91-96

AbstractThe results of previous studies, mostly involving primates, have shown a correlation between mothering styles and later explorative behavior of the young. On the basis of our previous study on the existence of mothering styles in guinea pigs we conclude that three main components of maternal behavior are useful for these kinds of studies: locomotion, affiliative behavior, and aggressive behavior...

article

Factors affecting vigilance in springbok: importance of vegetative cover, location in herd, and herd size

J. Burger, C. Safina, M. Gochfeld

acta ethologica > 2000 > 2 > 2 > 97-104

AbstractVigilance in vertebrates is often inversely related to group size. We present evidence that distance to bushes and location within the herd are also critical factors in vigilance in springbok (Antidorcas marsupialis) in Etosha National Park, Namibia, where they are the preferred prey of cheetahs (Acinonyx jubatus). Most springbok feed in heterospecific herds, both by grazing on grass and browsing...

article

Handedness and aggressive behavior in an Ntumu village in southern Cameroon

S. Carrire, M. Raymond

acta ethologica > 2000 > 2 > 2 > 111-114

AbstractHandedness in humans is possibly maintained by a frequency-dependent advantage during aggressive interactions. To contribute to relevant data related to this idea, functional handedness has been measured in a traditional ethnic group (Ntumu) from southern Cameroon, and confronted to the level of aggressive behavior. Functional handedness was measured by the hand holding the machete, an asymmetric...

article

Effects of physiological and social challenges in different seasons on fecal testosterone and corticosterone in male domestic geese (Anser domesticus)

K. Kotrschal, J. Dittami, K. Hirschenhauser, E. Mstl, more

acta ethologica > 2000 > 2 > 2 > 115-122

AbstractWe investigated the reliability of the non-invasive approach of measuring steroid hormones from feces in the domestic goose (Anser domesticus), a mainly herbivorous bird with a short gut passage time (23 h). Groups of eight outdoor-housed male domestic geese were subjected to three different experiments, injection of either GnRH analogue or ACTH, or social stimulation by confrontation with...

article

Microhabitat selection and audible sexual signalling in the wolf spider Hygrolycosa rubrofasciata (Araneae, Lycosidae)

J. S. Kotiaho, R. V. Alatalo, J. Mappes, S. Parri

acta ethologica > 2000 > 2 > 2 > 123-128

AbstractWe studied the microhabitat selection and male sexual signalling behaviour in the wolf spider Hygrolycosa rubrofasciata (Ohlert). Males strike dry leaves with their abdomen, producing an audible sexual drumming signal, and females use this signal to choose mating partners. In the field we followed male drumming rate and microhabitat selection using both the markrecapture method and direct...

article

Larval density and developmental instability in the acoustically orienting parasitoid Homotrixa alleni.

J. Hunt, G. R. Allen

acta ethologica > 2000 > 2 > 2 > 129-132

AbstractThe relationship between developmental stress caused by intraspecific larval density and fluctuating asymmetry (FA) was examined in the tachinid parasitoid Homotrixa alleni. Individuals reared in larger clutches were significantly smaller in body size when they emerged as adults. As predicted, smaller individuals were shown to have significantly higher levels of FA in their tibiae. This negative...

article

Coal tits increase evening body mass in response to tawny owl calls

L. M. Bautista, S. J. Lane

acta ethologica > 2000 > 2 > 2 > 105-110

AbstractCurrent theory predicts small birds should have a reduced body mass when daytime predation risk is high. However, the influence that nighttime predators might have on changes in body mass or daytime foraging behaviour has not been addressed. We therefore studied the effect of changes in perceived nocturnal predation risk on the body mass of captive coal tits. In a soundproof room, eight coal...

article

Communication networks: social environments for receiving and signalling behaviour

P. K. McGregor, T. M. Peake

acta ethologica > 2000 > 2 > 2 > 71-81

AbstractCommunication and social behaviour are inextricably linked, with communication mediating important social behaviours such as resource defence and mate attraction. However, the social environment in which communication occurs is often ignored in discussions of communication behaviour. We argue that networks of several individuals are the common social environment for communication behaviour...

article

Vigorously courting male sticklebacks are poor fathers

F.A. von Hippel

acta ethologica > 2000 > 2 > 2 > 83-89

AbstractMale threespine sticklebacks (Gasterosteus aculeatus) that are unsuccessful at hatching eggs may provide insufficient parental care or have unhealthy or unfertilized eggs. In this study, most males that were unsuccessful at hatching eggs appeared to be poor fathers because they depleted their energy reserves by vigorously courting females and by maintaining intense nuptial coloration during...

article

Playback experiments: design and analysis

P. K. McGregor

acta ethologica > 2000 > 3 > 1 > 3-8

AbstractThe scientific value of the outcome of an experiment is closely related to its design and analysis. This article deals with the design issues of pseudoreplication (whether the experimental design has the statistical features needed to answer the question as posed) and execution errors (problems arising from how the experiment was conducted). Three issues of analysis are also dealt with: the...

article

Avian colour vision and avian video playback experiments

I. C. Cuthill, N. S. Hart, J. C. Partridge, A. T. D. Bennett, more

acta ethologica > 2000 > 3 > 1 > 29-37

AbstractVideo playback potentially allows the presentation, manipulation, and replication of realistic moving visual stimuli, in a way that is impossible with real animals or static dummies, and difficult even with mechanical models. However, there are special problems attached to the use of this technology; this article concentrates on the problem of accurate colour rendition. Video and television...

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acta ethologica

Socialization in spectacled parrotlets (Forpus conspicillatus): how juveniles compensate for the lack of siblings

The effects of kinship and density on growth and metamorphosis of the bronze frog (Ranatemporalis) tadpoles

Nocturnal orientation of robins, Erithacus rubecula: birds caught during migratory flight are disoriented

An integrative approach to sex change: social, behavioural and neurochemical changes in Lythrypnus dalli (Pisces)

Honesty of agonistic signalling and effects of size and motivation asymmetry in contests

Some properties of a pheromone allowing individual recognition, from the scats of an Australian lizard, Egernia striolata

Refuge use by fish as a function of body weight changes

Child social ethology and peer relations: a developmental review of methodology and findings

Male display characters, gonadal maturation and androgens in the cichlid fish Oreochromis mossambicus

Is maternal behavior correlated with later explorative behavior of young guinea pigs (Cavia aperea f. porcellus)?

Factors affecting vigilance in springbok: importance of vegetative cover, location in herd, and herd size

Handedness and aggressive behavior in an Ntumu village in southern Cameroon

Effects of physiological and social challenges in different seasons on fecal testosterone and corticosterone in male domestic geese (Anser domesticus)

Microhabitat selection and audible sexual signalling in the wolf spider Hygrolycosa rubrofasciata (Araneae, Lycosidae)

Larval density and developmental instability in the acoustically orienting parasitoid Homotrixa alleni.

Coal tits increase evening body mass in response to tawny owl calls

Communication networks: social environments for receiving and signalling behaviour

Vigorously courting male sticklebacks are poor fathers

Playback experiments: design and analysis

Avian colour vision and avian video playback experiments

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