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Prioritization of fish welfare issues in European salmonid aquaculture using the Delphi method
Boogaart, L. van den; Slabbekoorn, H.; Scherer, L. 2023
Prioritization of fish welfare issues in European salmonid aquaculture using the Delphi method
Article / Letter to editor
open access
Effects of seismic airgun playbacks on swimming patterns and behavioural states of Atlantic cod in a net pen
Hubert, J.; Campbell, J.A.; Slabbekoorn, H. 2020
Effects of seismic airgun playbacks on swimming patterns and behavioural states of Atlantic cod in a net pen
Article / Letter to editor
open access
Anthropogenic sound can affect fish behaviour and physiology which may affect their well-being. However, it remains a major challenge to translate such effects to consequences for fitness at an... Show more

Anthropogenic sound can affect fish behaviour and physiology which may affect their well-being. However, it remains a major challenge to translate such effects to consequences for fitness at an individual and population level. For this, energy budget models have been developed, but suitable data to parametrize these models are lacking. A first step towards such parametrization concerns the objective quantification of behavioural states at high resolution. We experimentally exposed individual Atlantic cod (Gadus morhua) in a net pen to the playback of seismic airgun sounds. We demonstrated that individual cod in the net pen did not change their swimming patterns immediately at the onset of the sound exposure. However, several individuals changed their time spent in three different behavioural states during the 1 h exposure. This may be translated to changes in energy expenditure and provide suitable input for energy budget models that allow predictions about fitness and population consequences.

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The role of ambient sound levels, signal-to-noise ratio, and stimulus pulse rate on behavioural disturbance of seabass in a net pen
Hubert, J.; Neo, Y.Y.; Winter, H.V.; Slabbekoorn, H. 2019
The role of ambient sound levels, signal-to-noise ratio, and stimulus pulse rate on behavioural disturbance of seabass in a net pen
Article / Letter to editor
open access
Anthropogenic sources increasingly contribute to the underwater soundscape and this may negatively impact aquatic life, including fish. Anthropogenic sound may mask relevant sound, alter behaviour,... Show moreAnthropogenic sources increasingly contribute to the underwater soundscape and this may negatively impact aquatic life, including fish. Anthropogenic sound may mask relevant sound, alter behaviour, physiology, and may lead to physical injury. Behavioural effect studies are often seen as critical to evaluate individual and population-level impact. However, behavioural responsiveness likely depends on context and characteristics of sound stimuli. We pose that ambient sound levels, signal-to-noise ratio (SNR), and pulse rate interval (PRI), could affect the behavioural response of fish. To study this, we experimentally exposed groups of tagged European seabass (Dicentrarchus labrax) to different impulsive sound treatments that varied in pulse level, elevated background level, SNR, and PRI. Upon sound exposure, the seabass increased their swimming depth. The variation in the increase in swimming depth could not be attributed to pulse level, background level, SNR or PRI. It may be that the current range of sound levels or PRIs was too narrow to find such effects. Show less
Source specific sound mapping: spatial, temporal and spectral distribution of sound in the Dutch North Sea
Sertlek, H.Ő.; Slabbekoorn, H.; Ten Cate, C.; Ainsli, M.A. 2019
Source specific sound mapping: spatial, temporal and spectral distribution of sound in the Dutch North Sea
Article / Letter to editor
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Biological clock function is linked to proactive and reactive personality types
Tudorache, C.; Slabbekoorn, H.; Robbers, Y.; Hin, E.; Meijer, J.H.; Spaink, H.P.; Schaaf, M.J.M. 2018
Biological clock function is linked to proactive and reactive personality types
Article / Letter to editor
open access
European seabass respond more strongly to noise exposure at night and habituate over repeated trials of sound exposure
Neo, Y.Y.; Hubert, J.; Bolle, L.J.; Winter, H.V.; Slabbekoorn, H. 2018
European seabass respond more strongly to noise exposure at night and habituate over repeated trials of sound exposure
Article / Letter to editor
open access
2020-04-16T00:00:00Z
Aquatic animals live in an acoustic world, prone to pollution by globally increasing noise levels. Noisy human activities at sea have become widespread and continue day and night. The potential... Show moreAquatic animals live in an acoustic world, prone to pollution by globally increasing noise levels. Noisy human activities at sea have become widespread and continue day and night. The potential effects of this anthropogenic noise may be context-dependent and vary with the time of the day, depending on diel cycles in animal physiology and behaviour. Most studies to date have investigated behavioural changes within a single sound exposure session while the effects of, and habituation to, repeated exposures remain largely unknown. Here, we exposed groups of European seabass (Dicentrarchus labrax) in an outdoor pen to a series of eight repeated impulsive sound exposures over the course of two days at variable times of day/night. The baseline behaviour before sound exposure was different between day and night; with slower swimming and looser group cohesion observed at night. In response to sound exposures, groups increased their swimming speed, depth, and cohesion; with a greater effect during the night. Furthermore, groups also showed inter-trial habituation with respect to swimming depth. Our findings suggest that the impact of impulsive anthropogenic noise may be stronger at night than during the day for some fishes. Moreover, our results also suggest that habituation should be taken into account for sound impact assessments and potential mitigating measures. Show less
Vocal foragers and silent crowds: context-dependent vocal variation in Northeast Atlantic long-finned pilot whales
Visser, F.; Kok, A.C.M.; Oudejans, M.G.; Scott-Hayward, L.A.S.; DeRuiter, S.L.; Alves, A.C.; ... ; Miller, P.J.O. 2017
Vocal foragers and silent crowds: context-dependent vocal variation in Northeast Atlantic long-finned pilot whales
Article / Letter to editor
open access
"Early birds" take it easy: diurnal timing is correlated with overall level in activity of zebrafish larvae
Amin, B.; Slabbekoorn, H.; Schaaf, M.J.M.; Tudorache, C. 2016
"Early birds" take it easy: diurnal timing is correlated with overall level in activity of zebrafish larvae
Article / Letter to editor
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Noise affects nest-box choice of 2 competing songbird species, but not their reproduction
Halfwerk, W.; Both, C.; Slabbekoorn, H. 2016
Noise affects nest-box choice of 2 competing songbird species, but not their reproduction
Article / Letter to editor
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Harbour porpoise movement strategy affects cumulative number of animals acoustically exposed to underwater explosions
Aarts, G.; Benda-Beckmann, A.M. von der; Lucke, K.; Sertlek, H.O.; Bemmelen, R. van; Geelhoed, S.C.V.; ... ; Kirkwood, R. 2016
Harbour porpoise movement strategy affects cumulative number of animals acoustically exposed to underwater explosions
Article / Letter to editor
open access
Sharp acoustic boundaries across an altitudinal avian hybrid zone despite asymmetric introgression.
Halfwerk, W.; Dingle, C.; Brinkhuizen, D.M.; Poelstra, J.W.; Komdeur, J.; Slabbekoorn, H. 2016
Sharp acoustic boundaries across an altitudinal avian hybrid zone despite asymmetric introgression.
Article / Letter to editor
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Birdsong is a sexually selected trait that could play an important evolutionary role when related taxa come into secondary contact. Many songbird species, however, learn their songs through copying... Show moreBirdsong is a sexually selected trait that could play an important evolutionary role when related taxa come into secondary contact. Many songbird species, however, learn their songs through copying one or more tutors, which complicates the evolutionary outcome of such contact. Two subspecies of a presumed vocal learner, the grey-breasted wood-wren (Henicorhina leucophrys), replace each other altitudinally across the western slope of the Ecuadorian Andes. These subspecies are morphologically very similar, but show striking differences in their song. We examined variation in acoustic traits and genetic composition across the altitudinal range covered by both subspecies and between two allopatric populations. The acoustic boundary between the subspecies was found to be highly abrupt across a narrow elevational range with virtually no evidence of song convergence. Mixed singing and use of hetero-subspecific song occurred in the contact zone and was biased towards the use of leucophrys song types. Hetero-subspecific song copying by hilaris and not by leucophrys reflected a previously found asymmetric pattern of response to song playback. Using amplified fragment length polymorphisms (AFLP) markers, we detected hybridization in the contact zone and asymmetric introgression in parapatric populations, with more leucophrys alleles present in hilaris populations than vice versa. This pattern may be a trail of introgression due to upslope displacement of leucophrys by hilaris. Our data suggest that song learning may impact speciation and hybridization in contrasting ways at different spatial scales: although learning may speed up population divergence in songs, thereby enhancing assortative mating and reducing gene flow, it may at a local level also lead to the copying of heterospecific songs, therefore allowing some level of hybridization and introgression. Show less
Behavioural responses to sound exposure in captivity by two fish species with different hearing ability
Sabet, S.S.; Wesdorp, K.; Campbell, J.; Snelderwaard, P.C.; Slabbekoorn, H. 2016
Behavioural responses to sound exposure in captivity by two fish species with different hearing ability
Article / Letter to editor
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Learning to cope: vocal adjustment to urban noise is correlated with prior experience in black-capped chickadees.
LaZerte, S.E.; Slabbekoorn, H.; Otter, K.A. 2016
Learning to cope: vocal adjustment to urban noise is correlated with prior experience in black-capped chickadees.
Article / Letter to editor
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Urban noise can interfere with avian communication through masking, but birds can reduce this interference by altering their vocalizations. Although several experimental studies indicate that birds... Show moreUrban noise can interfere with avian communication through masking, but birds can reduce this interference by altering their vocalizations. Although several experimental studies indicate that birds can rapidly change their vocalizations in response to sudden increases in ambient noise, none have investigated whether this is a learned response that depends on previous exposure. Black-capped chickadees (Poecile atricapillus) change the frequency of their songs in response to both fluctuating traffic noise and experimental noise. We investigated whether these responses to fluctuating noise depend on familiarity with noise. We confirmed that males in noisy areas sang higher-frequency songs than those in quiet areas, but found that only males in already-noisy territories shifted songs upwards in immediate response to experimental noise. Unexpectedly, males in more quiet territories shifted songs downwards in response to experimental noise. These results suggest that chickadees may require prior experience with fluctuating noise to adjust vocalizations in such a way as to minimize masking. Thus, learning to cope may be an important part of adjusting to acoustic life in the city. Show less
Son et lumière: Sound and light effects on spatial distribution and swimming behavior in captive zebrafish.
Shafiei Sabet, S; Dooren, D. van; Slabbekoorn, H. 2016
Son et lumière: Sound and light effects on spatial distribution and swimming behavior in captive zebrafish.
Article / Letter to editor
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Aquatic and terrestrial habitats are heterogeneous by nature with respect to sound and light conditions. Fish may extract signals and exploit cues from both ambient modalities and they may also... Show moreAquatic and terrestrial habitats are heterogeneous by nature with respect to sound and light conditions. Fish may extract signals and exploit cues from both ambient modalities and they may also select their sound and light level of preference in free-ranging conditions. In recent decades, human activities in or near water have altered natural soundscapes and caused nocturnal light pollution to become more widespread. Artificial sound and light may cause anxiety, deterrence, disturbance or masking, but few studies have addressed in any detail how fishes respond to spatial variation in these two modalities. Here we investigated whether sound and light affected spatial distribution and swimming behavior of individual zebrafish that had a choice between two fish tanks: a treatment tank and a quiet and light escape tank. The treatments concerned a 2 × 2 design with noisy or quiet conditions and dim or bright light. Sound and light treatments did not induce spatial preferences for the treatment or escape tank, but caused various behavioral changes in both spatial distribution and swimming behavior within the treatment tank. Sound exposure led to more freezing and less time spent near the active speaker. Dim light conditions led to a lower number of crossings, more time spent in the upper layer and less time spent close to the tube for crossing. No interactions were found between sound and light conditions. This study highlights the potential relevance for studying multiple modalities when investigating fish behavior and further studies are needed to investigate whether similar patterns can be found for fish behavior in free-ranging conditions. Show less
Playbacks revisited: asymmetry in behavioural response across an acoustic boundary between two parapatric bird species
Burbidge, T.; Parson, T.; Caycedo-Rosales, P.C.; Cadena, D.C.; Slabbekoorn, H. 2015
Playbacks revisited: asymmetry in behavioural response across an acoustic boundary between two parapatric bird species
Article / Letter to editor
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Relative effects of ambient noise and habitat openness on signal transfer for chickadee vocalizations in rural and urban green-spaces
LaZerte, S.E.; Otter, K.A.; Slabbekoorn, H. 2015
Relative effects of ambient noise and habitat openness on signal transfer for chickadee vocalizations in rural and urban green-spaces
Article / Letter to editor
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Singing in the city: high song frequencies are no guarantee for urban success in birds
Moiron, M.; Gonzalez-Lagos, C.; Slabbekoorn, H.; Sol, D. 2015
Singing in the city: high song frequencies are no guarantee for urban success in birds
Article / Letter to editor
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Pollution going multimodal: the complex impact of the human-altered sensory environment on animal perception and performance
Halfwerk, W.; Slabbekoorn, H. 2015
Pollution going multimodal: the complex impact of the human-altered sensory environment on animal perception and performance
Article / Letter to editor
metadata only