Dokumente Fakultät für Biologie und Psychologie (inkl. GAUSS) nach Gutachter "Ostner, Julia Prof. Dr."
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Intergroup relationships in Verreaux's sifakas (Propithecus verreauxi)
(2015-12-15)How animals achieve collective action for territorial defense and how they establish relationships between neighboring groups has recently become a central topic in the study of animal behavior. The power of a group can ... -
Intra- and Intersexual Selection on Men: Their Relative Importance and Hormonal Underpinnings
(2018-01-26)Male competition is an important influence on the distribution of resources, such as mates, food or territory, and has been shown to be more strongly implicated, compared to female mate choice, in sexual selection on men. ... -
Male social relationships among wild Assamese macaques (Macaca assamensis)
(2016-11-08)General socioecological theories predict that in multi-male multi-female mammalian groups, males and females compete over resources of different nature. While females mainly compete over generally sharable food, males ... -
Mating systems and infant care of cooperatively breeding black-fronted tamarins (Leontocebus nigrifrons)
(2020-04-21)In animal societies, individual fitness partly depends on a decision on whether or not to provide parental care, and the number of mating partners. The later defines a social mating system, whereas consequences of copulations, ... -
Regulation of inter-sexual relationships within the microcosm of Guinea baboon units
(2023-03-03)Male reproductive success is linked in most animals to their access to fertile females. Resulting competition among males presents a strong selective pressure on male reproductive strategies. In species with female choice ... -
Secular changes in sexual and natural selection against deleterious genetic mutations in humans
(2017-12-20)All genetic variation once arose by mutation. Genetic variation is the substance on which natural selection can act, but mutations are random. Therefore, new variations usually have negative or no effects on an organism’s ... -
Sex-specific aging: Sex differences in survival and health in a wild primate population
(2015-01-15)Ageing influences the functioning of most living organisms in myriad ways and has profound consequences for their reproductive fitness and survival. Age-related changes in the functioning of an organism are thought to ... -
Social organisation of the narrow-striped mongoose (Mungotictis decemlineata) in Kirindy Forest C.N.F.E.R.E.F., Madagascar
(2016-02-16)The diversity of ecological and behavioural adaptations of the Carnivora makes them an exemplary group for studying patterns of mammalian social evolution. In particular, species displaying sex-specific forms of social ... -
Social relationships of female Guinea baboons (Papio papio) in Senegal
(2017-08-02)Biologists and psychologists have held a long-term fascination for understanding sex-specific life history behaviours. Selection pressures occur via three main evolutionary mechanisms which may influence males and females ... -
The role of oxytocin, testosterone and cortisol in affiliation and bonding in male Barbary macaqaues
(2020-01-30)Many group living mammals minimize the costs of sociality by forming stable affiliative relationships, termed social bonds, with other group members. These bonds are highly adaptive as they increase fitness, and strongly ... -
The social system of white-breasted mesites (Mesitornis variegata)
(2014-01-16)Animals show great diversity in their social systems, ranging from species living solitarily to species living in highly complex social groups. This variation in social systems provides the perfect setting to investigate ... -
The socio-endocrinology of female reproductive strategies in wild Assamese macaques (Macaca assamensis)
(2011-08-29)Sexual conflict is a prominent feature of animals living in multimale-multifemale groups, and drives the evolution of sex-specific reproductive strategies. Owing to divergent reproductive ... -
Theoretical and empirical analysis of the evolution of cooperation
(2014-09-25)Cooperative behaviour is widespread among humans and throughout the animal kingdom. Previous models suggest that the evolution of cooperation can be enhanced by network structure. However, recent experiments were not able ... -
Vocal communication in a tolerant multi-level society: insights from signallers and receivers in Guinea baboons
(2013-07-03)When studying the evolution of animal communication it is important to consider both, the signaller (i.e. signal structure and signal usage) and the receiver (i.e. signal response). While in primates the structure of sounds ... -
Vocal repertoires of two matrilineal social whale species Long-finned Pilot whales (Globicephala melas) & Killer whales (Orcinus orca) in northern Norway
(2017-05-10)The aim of this study was to describe and investigate the vocal repertoire and possible factors influencing the size and composition of two matrilineal social whale species: long-finned pilot whales and killer whales in ... -
Within- and between-group feeding competition in Siberut macaques (Macaca siberu) and Assamese macaques (Macaca assamensis)
(2014-02-26)Feeding competition remains of research interest as it affects growth, survival and reproductive success of individuals. It also limits group size and shapes the social structure of animal groups. Feeding competition is ...