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Introduction
Publications
Publications (60)
We experimentally show that in blue tits (Parus caeruleus) egg-laying date is causally linked to experience in the previous year. Females that received additional food in the nestling
period in one year laid eggs later in the next year compared with the control birds, whatever the degree of synchronization
with the natural food abundance in the pre...
Previous work on food-provisioning behaviour in blue tits suggested that the parents could gather larger prey items only by making longer foraging excursions, for example, by being more selective or by reaching more distant (and less exploited) feeding sites. Here, I show that within-nest, within-day variation in size of prey delivered by the paren...
A study (1982-1997) in the small cormorant colony of the Amsterdam Zoo addressed the question of what factors determine betweenseason divorce. The proportion of pairs splitting up the next year was 0.46, i.e. less than in wild populations. Low divorce rate could not be explained by the small population size. Computer simulations showed that if pair...
In several animal species, including birds, individuals are known to produce low‐frequency vocalisations during aggressive interactions with conspecifics. In this study, I investigated territorial interactions between male Eurasian Scops Owls Otus scops that occupyied territories in a densely‐packed area. The single‐note hoot of the Scops Owl is ge...
Territorial animals often reduce aggression towards familiar neighbours compared to unfamiliar conspecifics. However, variation in the response to different neighbours is less known. In this work, I examined the territorial behaviour of male scops owls during countersinging interactions with two familiar neighbours and I asked whether vocal behavio...
The reproducibility crisis (or replication crisis) in biomedical research is a particularly existential and under-addressed issue in the field of behavioral neuroscience, where, in spite of efforts to standardize testing and assay protocols, several known and unknown sources of confounding environmental factors add to variance. Human interference i...
Points represent one or more overlapping call positions by the same individual male. Segments joining points indicate the position of LightBlue and its rival during low-frequency contests. The area occupied by LightBlue is estimated by the 95% probability contour based on kernel density estimation (smoothing 17 m, n = 48 positions; for methods see...
In several animal species, including birds, individuals are known to produce low-frequency vocalizations during aggressive interactions with conspecifics. In this study, I investigated territorial interactions between male Eurasian Scops Owls that occupy territories in a densely-packed area. The single-note hoot of the Scops Owl is generally assume...
In this chapter, we address how one can detect and measure specific behaviors in zebrafish, from the embryonic stage to adulthood, and in various behavioral paradigms using automated, image-based analysis software. In the first section, we address the measurement of activity in embryos and heart rate in larvae. For the larval stage, we also show ho...
The Eurasian Scops Owl, a small nocturnal raptor living in continental and southern Europe, is often solitary and territorial but sometimes forms local groups, of which little is known. In this study, I examined a group of territorial Scops Owls in a habitat with limited nest site availability. Male Scops Owls were identified through spectrographic...
ERRATA - The actual authors are
Stewart, A.M., F. Grieco, R.A.J. Tegelenbosch, A. Kaluyeva, L.P.J.J. Noldus and A.V. Kalueff (2015).
A novel 3D method of locomotor analysis in adult zebrafish: implications for automated detection of CNS drug-evoked phenotypes. Poster presented at the 6th ISBS Regional Conference, Kobe, Japan, July 26-27, 2015).
Female mosquitoes use odor and heat as cues to navigate to a suitable landing site on their blood host. The way these cues affect flight behavior and modulate anemotactic responses, however, is poorly understood. We studied in-flight behavioral responses of females of the nocturnal malaria mosquito Anopheles gambiae sensu stricto to human odor and...
Movement parameters calculated by Track3D.
(DOCX)
Three series of temperature readings measured inside the flight arena. During series 1 and 2, the thermocouples were placed in a horizontal line with the heat source, starting at the upwind screen. Series 3 was measured in positive z direction under an angle of 13 degrees.
(EPS)
Rose-diagrams with distributions of the sum of velocities per 3° bins in the horizontal (xy) plane. The sum of velocities is a measure of the total distance moved within the defined direction. The max. value is a measure of scale and represents the maximum sum of velocities plotted within the diagram. For each treatment distributions are plotted fo...
The mean difference of ‘
x
in’ -
‘x
out’ presented for each mosquito while entering the plume and the mean difference of
‘x
out’ -
x
in’ upon exiting.
(DOCX)
Air treatment system.
(DOCX)
Rose-diagrams with distributions of the sum of velocities per 3° bins in the vertical (xz) plane. The sum of velocities is a measure of the total distance moved within the defined direction. The max. value is a measure of scale and represents the maximum sum of velocities plotted within the diagram. For each treatment distributions are plotted for...
Change in flight speed upon entering or leaving the plume. A - The mean speed of mosquitoes exposed to odor+heat of 10 frames before entering the plume and the subsequent first 10 frames while in the plume after crossing the buffer zone of 2.5 cm (n = 17). B - Represents the mean speed of 10 frames before exiting the plume and the first 10 frames a...
ANOVA for main effects and interaction of treatments on the tangent (crosswind-behavior) for different distances to the upwind screen.
(DOCX)
For PDF copies of all papers presented at the conference, see http://www.measuringbehavior.org/mb2012/home.
Zebrafish (Danio rerio) are rapidly becoming an important model organism in neuroscience research, representing an excellent species to study complex social phenotypes. Zebrafish actively form shoals, which can be used to quantify their shoaling behaviors, highly sensitive to various experimental manipulations. Recent advances in video-tracking tec...
For PDF copies of all papers presented at the conference, see http://www.measuringbehavior.org/mb2010/home.
Female malaria mosquitoes locate their hosts by olfaction. Little is known about nocturnal upwind navigation when the mosquito encounters host cues. This paper presents recently implemented techniques used to visualize and analyze the flight path of mosquitoes under low light conditions.
For PDF copies of all papers presented at the conference, see http://www.noldus.com/mb2008/.
For PDF copies of all papers presented at the conference, see http://www.noldus.com/mb2005/index.html.
About research on temperament in cormorants and effects on pair-formation.
Previous work has shown that the quantity or quality of food affects the degree of asymmetry in bilateral body traits in adult birds, but so far there is no evidence that this is the case in early phases of growth too. I studied asymmetry of tarsus length of nestling Blue Tits (Parus caeruleus) in relation to supplemental feeding. I offered food, i...
Previous work has shown that the quantity or quality of food affects the degree of asymmetry in bilateral body traits in adult birds, but so far there is no evidence that this is the case in early phases of growth too. I studied asymmetry of tarsus length of nestling Blue Tits (Parus caeruleus) in relation to supplemental feeding. I offered food, i...
Food provisioning in birds requires a considerable amount of time and usually has to be traded-off against other parental and non-parental activities. I investigated experimentally the rate at which blue tit Parus caeruleus parents deliver food to their brood after a change in food availability. The main argument behind this study is that parents e...
Research about predicting mate choice and divorce in Cormorants in a captive colony. Poster at the 23rd International Ornithological Congress, Beijing August 2002.
I investigated the short-term regulation of parental provisioning rate in blue tits by videotaping the parents at the nest. An additional feeding experiment allowed a comparison between the behaviour of parents rearing their brood under normal and supplemented feeding conditions. Videotaping revealed that parents changed their provisioning rate as...
This dissertation deals with the direct and indirect effects of food availability in different phases of breeding in a small insectivorous bird, the Blue Tit (Parus caeruleus). Previous studies have emphasised the dual nature of food influencing reproductive decisions in birds. On the one hand, food constitutes energy and nutritional resource for t...
The Cormorants at the Amsterdam Zoo colony have been studied by A. Kortlandt in most years since 1937. The most detailed and regular observations belong to the period 1982-1997 where most birds had been color-ringed. The zoo colony is located in a small pond with dead trees emerging from the water. The individually marked birds were tentatively sex...
A method to find out which species is more likely to start egg laying in a certain nestbox is described. Nestboxes were visited daily and the behaviour of the birds (Great, Blue and Coal Tits) that appeared around the nestbox was observed. The birds' response consisted mainly of giving alarm calls and showing inquisitive behaviour (i.e., approachin...
Some models of central place foraging relate the time taken to deliver a prey to the selectivity of the forager. If birds have to travel longer, they are expected to take only larger prey. Prey selectivity may also increase if birds have more time available for search activities. I tested this last hypothesis by experimentally increasing the food a...
The effects of nesting site availability on colony size were investigated in a Great Cormorant (Phalacrocorax carbo) colony on dead trees in north-East Italy. Trees have collapsed and colony structure has changed in recent years. After a steady increase in size, the breeding colony decreased dramatically as predicted by estimates of potential nesti...
Cormorant Research Group Bulletin 3: 22-24.
An overview of the Cormorant breeding colonies in Italy is presented. Numbers of pairs from 1985-1995 are reported for each breeding site, while details on habitat, breeding behaviours and breeding success are also presented. The current population size is nearly 500 pairs, and the average increase over the last 6 years 15.2%.
A collection of Lichens from the Nature Reserve Valli d'Argenta, in the Po Delta area, Italy. Items were collected in 1992.
Immature-plumaged cormorants nesting at the colony of Val Campotto (Italy)
Short note: Case of nesting of Great Cormorants in reed bed in colony in Italy. Most of the birds nested in dead trees.
The phenology and structure of the nest-sites of a Cormorant colony in dead trees, during 1992-
1993, are described. Sites were classified using three criteria: (1) topography of the colony; (2) density of breeding trees; (3) structure of breeding trees. Photographs were used to mark the nests during the breeding period. The number of nests increas...
Suppl. Ric. Biol. Selv. 27: 461-466
Cormorants Phalacrocorax carbo nesting at the Val Campotto colony occupied 270 nests in
1993. In 1992 and 1993, the number of fledglings from 190 successful broods was recorded. Each brood was assigned to one of 3 laying periods defined within the breeding season (February-March, April-early May, late May-July). The mean number of fledglings per ne...
Questions
Question (1)
Hello,
I would like to hear about how one can test a change in behavior within subjects. I am not interested in general conclusions about *all* subjects, as I believe subjects differ depending on the circumstances they face. Here it is:
Each Focal subiect is "measured" in two different conditions: when interacting with rival A and when interacting with rival B (A and B are generic individuals that differ among focal subjects). The number of samples varies between rivals As and Bs (for example 20 and 25, 21 and 23 etc.).
Now I am interested in what focal subjects do by contrasting the two conditions. I know that some focal subjects behave differently when interacting with A and B, while some other subjects behave (probably) in the same way. So I want to find out which focal subjects show a significant change in behavior. Sort of interaction Focal*rival.
Note that this is NOT a "repeated measures" in the strict sense, because the number of samples per focal * individual is not constant, and samples were not taken at regular intervals. In other words, I have a bunch of samples for Focal vs A, and another bunch of samples of Focal vs B. And A and B are unique between Focals.
Again, I am interested in what the Focal does when contrasting A and B. So each interaction Focal*individual is the main factor here.
So what sort of test should I do ? I assume that "rival" is a random factor. How do I test the significance of the change between A and B for each Focal ?
Thank you,
Best regards
Fabrizio
Projects
Projects (5)
Focus species: Great Cormorant and Cinereous Vulture.
Animals show individual differences usually called "Temperament" or "Personality". In the first project, I worked with the late Adriaan Kortlandt in the analysis of a 20+ years dataset of interactions between Great Cormorant in a zoo. Kortlandt's extensive work in the field (summarized in an article published in Ardea 83 (1), 11-26) revealed that individual Cormorants have temperamental characteristics beyond the well known ritualized patterns, and that those differences play a key role in the outcome of pair-formation. His work was largely ignored. A 20+ years zoo database allows to verify the claim that such differences are consistent in the individual's lifetime.
In the second project, I look at individual differences in the Cinereous Vulture (Aegypius monachus) in a zoo colony. I am curious to see if such differences are easily observable, what role they play in social interactions, and whether they influence pair formation.
