Martijn Hammers
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View article: Nest-site selection and nest predation in a tropical passerine in relation to food, friends, and foes
Nest-site selection and nest predation in a tropical passerine in relation to food, friends, and foes Open
Nest-site selection is an important determinant of avian reproductive success, mainly through its effect on predation risk. However, which environmental and social factors affect nest-site selection and predation risk remains less well und…
View article: Nest-site selection and nest predation in a tropical passerine in relation to food, friends and foes
Nest-site selection and nest predation in a tropical passerine in relation to food, friends and foes Open
Nest-site selection is an important determinant of avian reproductive success, mainly through its effect on predation risk. However, how environmental and social factors affect nest-site selection and predation risk remains less well under…
View article: Implications of adult sex ratios on natal dispersal in a cooperative breeder
Implications of adult sex ratios on natal dispersal in a cooperative breeder Open
In cooperatively breeding species, sexually mature individuals may delay natal dispersal and become subordinates, helping a dominant pair raise offspring. To understand how cooperative breeding evolved, it is important to determine the mec…
View article: Sex-dependent effects of parental age on offspring fitness in a cooperatively breeding bird
Sex-dependent effects of parental age on offspring fitness in a cooperatively breeding bird Open
Parental age can have considerable effects on offspring phenotypes and health. However, intergenerational effects may also have longer term effects on offspring fitness. Few studies have investigated parental age effects on offspring fitne…
View article: Nest defence behaviour is similar between pair members but only male behaviour predicts nest survival in barnacle geese
Nest defence behaviour is similar between pair members but only male behaviour predicts nest survival in barnacle geese Open
Behavioural patterns often differ consistently across individuals and are linked to fitness. In species with biparental care, the defence behaviour of both parents can affect reproductive success through offspring survival. In addition to …
View article: Seychelles warblers with silver spoons: Juvenile body mass is a lifelong predictor of annual survival, but not annual reproduction or senescence
Seychelles warblers with silver spoons: Juvenile body mass is a lifelong predictor of annual survival, but not annual reproduction or senescence Open
The environment experienced during development, and its impact on intrinsic condition, can have lasting outcomes for individual phenotypes and could contribute to variation in adult senescence trajectories. However, the nature of this rela…
View article: Early‐life conditions impact juvenile telomere length, but do not predict later life‐history strategies or fitness in a wild vertebrate
Early‐life conditions impact juvenile telomere length, but do not predict later life‐history strategies or fitness in a wild vertebrate Open
Environmental conditions experienced during early life may have long‐lasting effects on later‐life phenotypes and fitness. Individuals experiencing poor early‐life conditions may suffer subsequent fitness constraints. Alternatively, indivi…
View article: The contribution of extra‐pair paternity to the variation in lifetime and age‐specific male reproductive success in a socially monogamous species
The contribution of extra‐pair paternity to the variation in lifetime and age‐specific male reproductive success in a socially monogamous species Open
In socially monogamous species, extra-pair paternity (EPP) is predicted to increase variance in male reproductive success (RS) beyond that resulting from genetic monogamy, thus, increasing the "opportunity for selection" (maximum strength …
View article: Sex-specific influence of communal breeding experience on parenting performance and fitness in a burying beetle
Sex-specific influence of communal breeding experience on parenting performance and fitness in a burying beetle Open
Communal breeding, wherein multiple conspecifics live and reproduce together, may generate short-term benefits in terms of defence and reproduction. However, its carry-over effects remain unclear. We experimentally tested the effects of co…
View article: Seychelles warblers with silver spoons: juvenile condition is a lifelong predictor of annual survival, but not annual reproduction or senescence
Seychelles warblers with silver spoons: juvenile condition is a lifelong predictor of annual survival, but not annual reproduction or senescence Open
1) The environment experienced during development, and its impact on intrinsic condition, can have lasting outcomes for adult phenotypes and could contribute to the individual variation in senescence trajectories. 2) However, the nature of…
View article: Structural equation modeling reveals determinants of fitness in a cooperatively breeding bird
Structural equation modeling reveals determinants of fitness in a cooperatively breeding bird Open
Even in well-studied organisms, it is often challenging to uncover the social and environmental determinants of fitness. Typically, fitness is determined by a variety of factors that act in concert, thus forming complex networks of causal …
View article: Contemporary evolution of the innate immune receptor gene <i>TLR3</i> in an isolated vertebrate population
Contemporary evolution of the innate immune receptor gene <i>TLR3</i> in an isolated vertebrate population Open
Understanding where genetic variation exists, and how it influences fitness within populations is important from an evolutionary and conservation perspective. Signatures of past selection suggest that pathogen‐mediated balancing selection …
View article: Helpers compensate for age-related declines in parental care and offspring survival in a cooperatively breeding bird
Helpers compensate for age-related declines in parental care and offspring survival in a cooperatively breeding bird Open
Offspring from elderly parents often have lower survival due to parental senescence. In cooperatively breeding species, where offspring care is shared between breeders and helpers, the alloparental care provided by helpers is predicted to …
View article: Contemporary evolution of the viral-sensing TLR3 gene in an isolated vertebrate population
Contemporary evolution of the viral-sensing TLR3 gene in an isolated vertebrate population Open
Understanding where and how genetic variation is maintained within populations is important from an evolutionary and conservation perspective. Signatures of past selection suggest that pathogen-mediated balancing selection is a key driver …
View article: Hematocrit, age, and survival in a wild vertebrate population
Hematocrit, age, and survival in a wild vertebrate population Open
Understanding trade‐offs in wild populations is difficult, but important if we are to understand the evolution of life histories and the impact of ecological variables upon them. Markers that reflect physiological state and predict future …
View article: Habitat fragmentation shapes natal dispersal and sociality in an Afrotropical cooperative breeder
Habitat fragmentation shapes natal dispersal and sociality in an Afrotropical cooperative breeder Open
It remains poorly understood how effects of anthropogenic activity, such as large-scale habitat fragmentation, impact sociality in animals. In cooperatively breeding species, groups are mostly formed through delayed offspring dispersal, an…
View article: Haematocrit, age and survival in a vertebrate population
Haematocrit, age and survival in a vertebrate population Open
Understanding trade-offs in wild populations is difficult, but important if we are to understand the evolution of life histories and the impact of ecological variables upon them. Markers that reflect physiological state and predict future …
View article: Age‐dependent changes in infidelity in Seychelles warblers
Age‐dependent changes in infidelity in Seychelles warblers Open
Extra‐pair paternity (EPP) is often linked to male age in socially monogamous vertebrates; that is, older males are more likely to gain EPP and less likely to be cuckolded. However, whether this occurs because males improve at gaining pate…
View article: Age and terminal reproductive attempt influence laying date in the thorn‐tailed rayadito
Age and terminal reproductive attempt influence laying date in the thorn‐tailed rayadito Open
Age‐specific variation in reproductive effort can affect population dynamics, and is a key component of the evolution of reproductive tactics. Late‐life declines are a typical feature of variation in reproduction. However, the cause of the…
View article: Helpers compensate for age-related declines in parental care and offspring survival in a cooperatively breeding bird
Helpers compensate for age-related declines in parental care and offspring survival in a cooperatively breeding bird Open
Offspring from elderly parents often have lower survival due to parental senescence. In cooperatively breeding species, where offspring care is shared between breeders and helpers, the alloparental care provided by helpers is predicted to …
View article: Egg investment in response to helper presence in cooperatively breeding Tibetan ground tits
Egg investment in response to helper presence in cooperatively breeding Tibetan ground tits Open
Life‐history theory predicts a trade‐off between current and future reproduction to maximize lifetime fitness. In cooperatively breeding species, where offspring care is shared between breeders and helpers, helper presence may influence th…
View article: Compensatory and additive helper effects in the cooperatively breeding Seychelles warbler ( <i>Acrocephalus sechellensis</i> )
Compensatory and additive helper effects in the cooperatively breeding Seychelles warbler ( <i>Acrocephalus sechellensis</i> ) Open
In cooperatively breeding species, care provided by helpers may affect the dominant breeders’ investment trade‐offs between current and future reproduction. By negatively compensating for such additional care, breeders can reduce costs of …
View article: Microfilarial infections associated with body mass loss of Village Weavers <i>Ploceus cucullatus</i>
Microfilarial infections associated with body mass loss of Village Weavers <i>Ploceus cucullatus</i> Open
Haemoparasitic infections in wild birds have been widely studied in order to understand parasite-host relationships, but our understanding of their impact on the host's fitness is still limited. In this study, we quantified the association…
View article: Data Hammers et al.
Data Hammers et al. Open
Data used in Hammers et al. Breeders the receive help age more slowly in a cooperatively breeding bird. Nature Communications.
View article: Compensatory and additive helper effects in the cooperatively breeding Seychelles warbler (<i>Acrocephalus sechellensis</i>)
Compensatory and additive helper effects in the cooperatively breeding Seychelles warbler (<i>Acrocephalus sechellensis</i>) Open
In cooperatively breeding species, helper aid may affect dominant breeders’ investment trade-offs between current and future reproduction. By compensating for the care provided by helpers, breeders can reduce the costs of reproduction and …
View article: Subordinate females in the cooperatively breeding Seychelles warbler obtain direct benefits by joining unrelated groups
Subordinate females in the cooperatively breeding Seychelles warbler obtain direct benefits by joining unrelated groups Open
In many cooperatively breeding animals, a combination of ecological constraints and benefits of philopatry favours offspring taking a subordinate position on the natal territory instead of dispersing to breed independently. However, in man…
View article: Frequency‐dependent resemblance of male‐colored females to males in a damselfly
Frequency‐dependent resemblance of male‐colored females to males in a damselfly Open
Dear editor, Mimetic protection is most effective when mimics are relatively rare (Pfennig et al., 2001). In polymorphic damselfly species, male-colored female morphs may avoid costly male mating attempts because they are not immediately r…
View article: Spatio‐temporal variation in lifelong telomere dynamics in a long‐term ecological study
Spatio‐temporal variation in lifelong telomere dynamics in a long‐term ecological study Open
Understanding individual‐level variation in response to the environment is fundamental to understanding life‐history evolution and population dynamics. Telomeres, the protective caps at the ends of chromosomes, shorten in response to oxida…