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Behavioral Ecology and Sociobiology

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https://www.readbyqxmd.com/read/27616809/ant-larvae-regulate-worker-foraging-behavior-and-ovarian-activity-in-a-dose-dependent-manner
#1
Yuko Ulrich, Dominic Burns, Romain Libbrecht, Daniel J C Kronauer
Division of labor in insect societies relies on simple behavioral rules, whereby individual colony members respond to dynamic signals indicating the need for certain tasks to be performed. This in turn gives rise to colony-level phenotypes. However, empirical studies quantifying colony-level signal-response dynamics are lacking. Here, we make use of the unusual biology and experimental amenability of the queenless clonal raider ant Cerapachys biroi, to jointly quantify the behavioral and physiological responses of workers to a social signal emitted by larvae...
July 2016: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/27182103/the-relationship-between-testosterone-and-long-distance-calling-in-wild-male-chimpanzees
#2
Pawel Fedurek, Katie E Slocombe, Drew K Enigk, Melissa Emery Thompson, Richard W Wrangham, Martin N Muller
Long-distance calling is a common behaviour in animals that has various important social functions. At a physiological level, calling is often mediated by gonadal hormones such as testosterone (T), particularly when its function is linked to intra-sexual competition for mates or territory. T also plays an important role in the development of vocal characteristics associated with dominance in humans. However, the few available studies of T and vocal behaviour in non-human primates suggest that in primates T has less influence on call production than in other animals...
May 2016: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/27881897/elevated-reproduction-does-not-affect-telomere-dynamics-and-oxidative-stress
#3
Joanna Sudyka, Giulia Casasole, Joanna Rutkowska, Mariusz Cichoń
ABSTRACT: Oxidative stress and telomere dynamics are considered to be powerful biomarkers quantifying a potential trade-off between current reproduction and self-maintenance. Recent studies confirmed the negative impact of elevated reproduction on telomeres, but the evidence for the cost of reproduction in terms of oxidative stress remains equivocal. In order to induce reproductive costs, we experimentally manipulated reproductive effort by increasing brood size in captive zebra finches (Taeniopygia guttata) and additionally challenged all birds by a low ambient temperature to facilitate detection of these costs...
2016: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/27881896/dynamic-habitat-corridors-for-marine-predators-intensive-use-of-a-coastal-channel-by-harbour-seals-is-modulated-by-tidal-currents
#4
Gordon D Hastie, Deborah J F Russell, Steven Benjamins, Simon Moss, Ben Wilson, Dave Thompson
ABSTRACT: Previous studies have found that predators utilise habitat corridors to ambush prey moving through them. In the marine environment, coastal channels effectively act as habitat corridors for prey movements, and sightings of predators in such areas suggest that they may target these for foraging. Unlike terrestrial systems where the underlying habitat structure is generally static, corridors in marine systems are in episodic flux due to water movements created by tidal processes...
2016: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/27881895/state-dependent-behavior-and-alternative-behavioral-strategies-in-brown-trout-salmo-trutta-l-fry
#5
Joacim Näslund, Jörgen I Johnsson
ABSTRACT: Animals generally adjust their behavior in response to bodily state (e.g., size and energy reserves) to optimize energy intake in relation to mortality risk, weighing predation probability against the risk of starvation. Here, we investigated whether brown trout Salmo trutta adjust their behavior in relation to energetic status and body size during a major early-life selection bottleneck, when fast growth is important. Over two consecutive time periods (P1 and P2; 12 and 23 days, respectively), food availability was manipulated, using four different combinations of high (H) and low (L) rations (i...
2016: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/27881894/competition-related-factors-directly-influence-preferences-for-facial-cues-of-dominance-in-allies
#6
Christopher D Watkins, Benedict C Jones
ABSTRACT: Alliance formation is a critical dimension of social intelligence in political, social and biological systems. As some allies may provide greater "leverage" than others during social conflict, the cognitive architecture that supports alliance formation in humans may be shaped by recent experience, for example in light of the outcomes of violent or non-violent forms intrasexual competition. Here we used experimental priming techniques to explore this issue. Consistent with our predictions, while men's preferences for dominant allies strengthened following losses (compared to victories) in violent intrasexual contests, women's preferences for dominant allies weakened following losses (compared to victories) in violent intrasexual contests...
2016: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/27784956/interactions-between-boldness-foraging-performance-and-behavioural-plasticity-across-social-contexts
#7
Guðbjörg Ásta Ólafsdóttir, Kit Magellan
ABSTRACT: Boldness, the tendency to be explorative, risk prone and proactive, often varies consistently between individuals. An individual's position on the boldness-shyness continuum has many implications. Bold individuals may outperform shyer conspecifics during foraging as they cover more ground, accumulate information more rapidly and make more frequent food discoveries. Individual variation in boldness may also affect behavioural plasticity across environmental contexts, as the time to process new information, the ability to locate and memorise resources and the time and ability to apply prior information in a novel context all differ between individuals...
2016: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/27784955/symmetry-breaking-in-mass-recruiting-ants-extent-of-foraging-biases-depends-on-resource-quality
#8
R I'Anson Price, C Grüter, W O H Hughes, S E F Evison
ABSTRACT: The communication involved in the foraging behaviour of social insects is integral to their success. Many ant species use trail pheromones to make decisions about where to forage. The strong positive feedback caused by the trail pheromone is thought to create a decision between two or more options. When the two options are of identical quality, this is known as symmetry breaking, and is important because it helps colonies to monopolise food sources in a competitive environment...
2016: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/27546954/the-effect-of-ambient-temperature-habitat-quality-and-individual-age-on-incubation-behaviour-and-incubation-feeding-in-a-socially-monogamous-songbird
#9
Seyed Mehdi Amininasab, Sjouke A Kingma, Martje Birker, Hanno Hildenbrandt, Jan Komdeur
ABSTRACT: Incubation is an important aspect of avian life history. The behaviour is energetically costly, and investment in incubation strategies within species, like female nest attentiveness and the feeding by the non-incubating partner during incubation, can therefore vary depending on environmental and individual characteristics. However, little is known about the combined effect of these characteristics. We investigated the importance of ambient temperature, habitat quality, and bird age on female incubation behaviour and male feeding of the incubating female (incubation feeding) in blue tits Cyanistes caeruleus, a socially monogamous songbird...
2016: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/27478300/consequences-of-a-warming-climate-for-social-organisation-in-sweat-bees
#10
Roger Schürch, Christopher Accleton, Jeremy Field
ABSTRACT: The progression from solitary living to caste-based sociality is commonly regarded as a major evolutionary transition. However, it has recently been shown that in some taxa, sociality may be plastic and dependent on local conditions. If sociality can be environmentally driven, the question arises as to how projected climate change will influence features of social organisation that were previously thought to be of macroevolutionary proportions. Depending on the time available in spring during which a foundress can produce worker offspring, the sweat bee Halictus rubicundus is either social or solitary...
2016: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/27478299/mother-male-bond-but-not-paternity-influences-male-infant-affiliation-in-wild-crested-macaques
#11
Daphne Kerhoas, Lars Kulik, Dyah Perwitasari-Farajallah, Muhammad Agil, Antje Engelhardt, Anja Widdig
ABSTRACT: In promiscuous primates, interactions between adult males and infants have rarely been investigated. However, recent evidence suggests that male affiliation towards infants has an influence on several aspects of the infants' life. Furthermore, affiliations may be associated with male reproductive strategy. In this study, we examined which social factors influenced male-infant affiliation initiated by either male or infant, in wild crested macaques (Macaca nigra). We combined behavioral data and genetic paternity analysis from 30 infants living in three wild groups in Tangkoko Reserve, Indonesia...
2016: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/27397966/from-division-of-labor-to-the-collective-behavior-of-social-insects
#12
Deborah M Gordon
'Division of labor' is a misleading way to describe the organization of tasks in social insect colonies, because there is little evidence for persistent individual specialization in task. Instead, task allocation in social insects occurs through distributed processes whose advantages, such as resilience, differ from those of division of labor, which are mostly based on learning. The use of the phrase 'division of labor' persists for historical reasons, and tends to focus attention on differences among individuals in internal attributes...
2016: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/27397965/parasites-modulate-within-colony-activity-and-accelerate-the-temporal-polyethism-schedule-of-a-social-insect-the-honey-bee
#13
Myrsini E Natsopoulou, Dino P McMahon, Robert J Paxton
Task allocation in social insect colonies is generally organised into an age-related division of labour, termed the temporal polyethism schedule, which may in part have evolved to reduce infection of the colony's brood by pests and pathogens. The temporal polyethism schedule is sensitive to colony perturbations that may lead to adaptive changes in task allocation, maintaining colony homeostasis. Though social insects can be infected by a range of parasites, little is known of how these parasites impact within-colony behaviour and the temporal polyethism schedule...
2016: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/27217614/changes-in-vocal-parameters-with-social-context-in-humpback-whales-considering-the-effect-of-bystanders
#14
Rebecca A Dunlop
ABSTRACT: Many theories and communication models developed from terrestrial studies focus on a simple dyadic exchange between a sender and receiver. During social interactions, the "frequency code" hypothesis suggests that frequency characteristics of vocal signals can simultaneously encode for static signaler attributes (size or sex) and dynamic information, such as motivation or emotional state. However, the additional presence of a bystander may result in a change of signaling behavior if the costs and benefits associated with the presence of this bystander are different from that of a simple dyad...
2016: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/27217613/yolk-steroids-in-great-tit-parus-major-eggs-variation-and-covariation-between-hormones-and-with-environmental-and-parental-factors
#15
C M Lessells, S Ruuskanen, H Schwabl
ABSTRACT: Avian mothers can potentially alter the phenotypes of their offspring by varying the concentration of steroid hormones in their eggs. We explored variation in androstenedione (A4), testosterone (T), 5α-dihydrotestosterone (DHT), 17β-estradiol (E2), and corticosterone (CORT) in the yolks of 12 free-living great tit Parus major clutches. We analyzed variation and covariation in greater detail than previous studies, using models for variation with laying sequence that take into account variable clutch size and comparing correlations between pairs of hormones at the within- and between-clutch levels...
2016: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/27217612/bears-and-berries-species-specific-selective-foraging-on-a-patchily-distributed-food-resource-in-a-human-altered-landscape
#16
Anne G Hertel, Sam M J G Steyaert, Andreas Zedrosser, Atle Mysterud, Hanna K Lodberg-Holm, Henriette Wathne Gelink, Jonas Kindberg, Jon E Swenson
ABSTRACT: When animals are faced with extraordinary energy-consuming events, like hibernation, finding abundant, energy-rich food resources becomes particularly important. The profitability of food resources can vary spatially, depending on occurrence, quality, and local abundance. Here, we used the brown bear (Ursus arctos) as a model species to quantify selective foraging on berries in different habitats during hyperphagia in autumn prior to hibernation. During the peak berry season in August and September, we sampled berry occurrence, abundance, and sugar content, a proxy for quality, at locations selected by bears for foraging and at random locations in the landscape...
2016: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/27194822/intergroup-encounters-in-verreaux-s-sifakas-propithecus-verreauxi-who-fights-and-why
#17
Flávia Koch, Johannes Signer, Peter M Kappeler, Claudia Fichtel
ABSTRACT: Individuals living in groups have to achieve collective action for successful territorial defense. Because conflicts between neighboring groups always involve risks and costs, individuals must base their decision to participate in a given conflict on an evaluation of the trade-off between potential costs and benefits. Since group members may differ in motivation to engage in group encounters, they exhibit different levels of participation in conflicts. In this study, we investigated factors influencing participation in intergroup encounters in Verreaux's sifakas (Propithecus verreauxi), a group-living primate from Madagascar...
2016: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/27194821/how-to-reduce-the-costs-of-ornaments-without-reducing-their-effectiveness-an-example-of-a-mechanism-from-carotenoid-based-plumage
#18
Adrian Surmacki, Anastazja Ragan, Ziemowit Kosiński, Marcin Tobółka, Paweł Podkowa
ABSTRACT: Carotenoid-based ornaments are often considered to be honest indicators of individual quality assessed by potential mates. However, males can use a variety of strategies that minimize the amount of costly carotenoids used while retaining the effectiveness of color signaling. Birds could do this by altering pigment intake, metabolism, or its presentation to a potential signal receiver. Here, we propose a new mechanism of lowering the costs of carotenoid displays in birds: differential allocation of pigments within single feathers...
2016: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/27069302/variation-in-pre-and-post-copulatory-sexual-selection-on-male-genital-size-in-two-species-of-lygaeid-bug
#19
Liam R Dougherty, David M Shuker
ABSTRACT: Sexual selection has been shown to be the driving force behind the evolution of the sometimes extreme and elaborate genitalia of many species. Sexual selection may arise before and/or after mating, or vary according to other factors such as the social environment. However, bouts of selection are typically considered in isolation. We measured the strength and pattern of selection acting on the length of the male intromittent organ (or processus) in two closely related species of lygaeid seed bug: Lygaeus equestris and Lygaeus simulans...
2016: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/27069301/keeping-eyes-peeled-guppies-exposed-to-chemical-alarm-cue-are-more-responsive-to-ambiguous-visual-cues
#20
Jessica F Stephenson
ABSTRACT: Information received from the visual and chemical senses is qualitatively different. For prey species in aquatic environments, visual cues are spatially and temporally reliable but risky as the prey and predator must often be in close proximity. Chemical cues, by contrast, can be distorted by currents or linger and thus provide less reliable spatial and temporal information, but can be detected from a safe distance. Chemical cues are therefore often the first detected and may provide a context in which prey respond to subsequent ambiguous cues ("context hypothesis")...
2016: Behavioral Ecology and Sociobiology
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