Natal Conditions Research Articles

Estimate for the Neutrino Magnetic Moment from Pulsar Kick Velocities Induced at the Birth of Strange Quark Matter Neutron Stars

We estimate the magnetic moment of electron neutrinos by computing the neutrino chirality flip rate that can occur in the core of a strange quark matter neutron star at birth. We show that this process allows neutrinos to anisotropically escape, thus inducing the star kick velocity. Although the flip from left- to right-handed neutrinos is assumed to happen in equilibrium, the no-go theorem does not apply because right-handed neutrinos do not interact with matter and the reverse process does not happen, producing the loss of detailed balance. For simplicity, we model the star core as consisting of strange quark matter. We find that even when the energy released in right-handed neutrinos is a small fraction of the total energy released in left-handed neutrinos, the process describes kick velocities for natal conditions, which are consistent with the observed ones and span the correct range of radii, temperatures and chemical potentials for typical magnetic field intensities. The neutrino magnetic moment is estimated to be μν∼3.6×10−18μB, where μB is the Bohr magneton. This value is more stringent than the bound found for massive neutrinos in a minimal extension of the standard model.

Context-specific “silver-spoon” effects of wetlands, climate, and temperature on lifetime fitness in a short-lived temperate-breeding migratory songbird

Drivers of global change are creating strongly contrasting early life conditions for developing offspring, which may have carry-over effects on lifetime fitness. We tested for “silver-spoon” effects of natal conditions (environmental conditions and maternal quality) and individual quality (pre-fledging) on the lifetime reproductive success (LRS) of aerial insectivorous adult tree swallows (Tachycineta bicolor) hatched in distinct populations with contrasting environments in Saskatchewan and British Columbia, Canada. In both populations, LRS of adults was influenced by environmental conditions they experienced as developing nestlings, but silver-spoon effects were context-dependent, indicating population-specific responses to the local environment. Higher natal temperature in Saskatchewan had positive silver-spoon effects on the LRS of adult swallows, but the opposite was observed in British Columbia, likely because the highest temperatures local recruits experienced as nestlings occurred during heat extremes. In Saskatchewan, where wetter conditions reflect higher wetland abundance and food supply, we detected a negative effect of good natal wetland conditions on adult LRS, contrary to our hypothesis. However, since current breeding wetland conditions are a strong driver of adult fitness, and adults experiencing high natal wetland abundance generally bred when wetland abundance was lower, we suspect any potential benefits of natal wetland abundance on LRS were overridden by wetland conditions during breeding. As hypothesized, wetter natal conditions in British Columbia, which reflect an unfavorable environment for developing nestlings, had negative silver-spoon effects on the LRS of adults. No maternal or pre-fledging quality effects were detected at either site. Therefore, LRS of individuals within distinct populations is influenced, at least in part, by carry-over effects of the natal environment that vary locally. Consequently, natal environmental conditions that affect fitness, with putative population-level consequences, may underly spatially-varying population trends of regionally distinct populations within a species’ range.

Novel environments induce variability in fitness-related traits.

Environmental change from anthropogenic activities threatens individual organisms, the persistence of populations, and entire species. Rapid environmental change puts organisms in a double bind, they are forced to contend with novel environmental conditions but with little time to respond. Phenotypic plasticity can act quickly to promote establishment and persistence of individuals and populations in novel or altered environments. In typical environmental conditions, fitness-related traits can be buffered, reducing phenotypic variation in expression of traits, and allowing underlying genetic variation to accumulate without selection. In stressful conditions, buffering mechanisms can break down, exposing underlying phenotypic variation, and permitting the expression of phenotypes that may allow populations to persist in the face of altered or otherwise novel environments. Using reciprocal transplant experiments of freshwater snails, we demonstrate that novel conditions induce higher variability in growth rates and, to a lesser degree, morphology (area of the shell opening) relative to natal conditions. Our findings suggest a potentially important role of phenotypic plasticity in population persistence as organisms face a rapidly changing, human-altered world.

Density-related reproductive costs and natal conditions predict male life history in a highly polygynous mammal

Density-related reproductive costs and natal conditions predict male life history in a highly polygynous mammal

Predictive Value of Sflt-1/Plgf Ratio for Occurrence of Preeclampsia in Singleton Pregnancies: A Retrospective Study

Introduction: Preeclampsia is multisystem disorder of pregnancy, characterized by endothelial and placental dysfunction. It is classified as an early onset (which occurs < 34 weeks) and late onset (which occurs ≥ 34 weeks). There is an increase of level of antiangiogenic factor of soluble form similar to tyrosine kinase 1 (sFlt-1) and decrease of level of proangiogenic placental growth factor (PlGF) at preeclampsia. High ratio sFlt-1/PlGF is connected to occurrence of preeclampsia. Materials and Methods: There was a retrospective study of the Clinic for Gynecology and Obstetrics of the University Clinical Center of Republic of Srpska (KGA UKC RS), which was implemented in period January 1st, 2020 – December 31st, 2021 and which included 224 patients hospitalized at the Department of Perinatology for suspected preeclampsia development, from 26+0 weeks of gestation until birth. One of the key criteria for the inclusion of patients in the study is the use of the sFlt-1/PlGF ratio as a marker for the onset of preeclampsia, and the determination of protein values in 24-hour urine (biuret). The antenatal state of the fetus was also monitored by ultrasound measurement of the flow resistance ratio (Ri) through the middle cerebral artery and the umbilical artery (C/U), as well as the values of the newborn’s Apgar score in the first and fifth minute of life (AS 1 and 5). The patients included in the study were divided into two groups according to gestational age: group 1 (<33+6 NG) and group 2 (≥34NG). For the purposes of the research, data from patient protocol books for the specified period, as well as corresponding data from the Clinical Information System (KIS), were used. Results: Calculated values for cut off 38 for group 1 are: NPV= 76.9%, PPV=72.0%, sensitivity=85.7%, specificity=58.8%, and for group 2 are: NPV= 89 ,1%, PPV=40.8%, sensitivity=72.1%, specificity=68.5%. For cut off 85, the calculated values for group 1 are: NPV= 82.4%, PPV=85.7%, sensitivity=85.7%, specificity=82.4%, and for group 2 they are: NPV= 84.9 %, PPV=70.4%, sensitivity=44.2%, specificity=94.4%. For cutt off 110, the calculated values for group 1 are: NPV= 77.8%, PPV=85%, sensitivity=81%, specificity=82.4%, and for group 2 they are: NPV= 83.5 %, PPV=72.7%, sensitivity=37.2%, specificity=95.8%. The measured value of protein in 24h urine (biuret) in comparison with the measured values of the sFlt-1/PlGF ratio have statistical significance for predicting the onset of preeclampsia. Statistical data processing obtained by examining the measured values of the sFlt-1/PlGF ratio and the antenatal and natal condition of the fetus (C/U and AS 1 and 5) showed statistical significance, except for C/U for group 2, where p=0.32. Conclusion: Determination of the sFlt-1/PlGF ratio as well as biuret and monitoring of the antenatal and postnatal state of the fetus significantly contributes to the timely diagnostic of preeclampsia, which impacts reducing the incidence of undesirable outcomes for the mother and the fetus.

THAT THERE BE A BEGINNING”: ARENDT AND NATALITY

Hannah Arendt’s concept of natality is customarily read as a response to Heidegger’s death-oriented philosophy, a vestige of Arendt’s earlier occupation with Augustine, or a remnant of Arendt’s brush with Jewish messianism by way of Walter Benjamin. This essay argues that the novelty of Arendt’s concept of natality cannot simply be reduced to Heidegger’s or any other philosophical influence. The essay urges the reader to take seriously the historical and political context within which Arendt deploys natality, i.e., the devastating experience of totalitarianism. For Arendt, natality is intertwined with the power to begin and initiate new in the world. The experience of political isolation, superfluousness, and loss of freedom under totalitarian regimes suggest to Arendt the exigency of theorizing a response. Arendt, therefore, formulates natality as a safeguard. Totalitarianism as a regime of oppression seeks to erase action and plurality, and Arendt as a response cements the possibility of human freedom in the irreducible human condition of natality.

Phenotypic and environmental correlates of natal dispersal movements in fragmented landscapes

ContextNatal dispersal critically influences eco-evolutionary dynamics and the persistence of spatially structured populations. As both short- and long-distance movements contribute to population persistence in fragmented landscapes, understanding dispersal requires assessing phenotypic and environmental effects on a wide range of distances.ObjectivesTo assess phenotypic and environmental correlates of dispersal movements in fragmented landscapes.MethodsWe radio-tracked juvenile middle spotted woodpeckers in fragmented landscapes to assess phenotypic and environmental effects on emigration age, transfer duration (in days), and transfer distances.ResultsLarge fledglings and those in good condition emigrated earlier than smaller individuals and those in worse condition. Birds in better condition also reduced transfer duration. Overall, females dispersed earlier, remained shorter at transfer and moved further than males. However, while females increased transfer distances with increasing connectivity, males increased distances with decreasing connectivity. Emigration age increased with decreasing patch size and increasing patch quality, and with decreasing population density in patches with soft edges. Both transfer duration and distance increased with decreasing population density.ConclusionsThe correlations between phenotypic traits of fledglings and their posterior movements suggest that early-life conditions influenced dispersal through carry-over effects. Early emigration from low-quality and high-populated patches can be a behavioural mechanism to quickly escape adverse natal conditions, but population density effects were modulated by edge hardness. Finally, because reductions in connectivity led to similar transfer distances between sexes through a reduction in female distances, a lack of sex-biased dispersal can be a previously overlooked effect of habitat isolation that may alter eco-evolutionary dynamics.

Seychelles warblers with silver spoons: Juvenile body mass is a lifelong predictor of annual survival, but not annual reproduction or senescence.

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 relationship in wild populations remains uncertain, owing to the difficulties in summarizing natal conditions and in long‐term monitoring of individuals from free‐roaming long‐lived species. Utilizing a closely monitored, closed population of Seychelles warblers (Acrocephalus sechellensis), we determine whether juvenile body mass is associated with natal socioenvironmental factors, specific genetic traits linked to fitness in this system, survival to adulthood, and senescence‐related traits. Juveniles born in seasons with higher food availability and into smaller natal groups (i.e., fewer competitors) were heavier. In contrast, there were no associations between juvenile body mass and genetic traits. Furthermore, size‐corrected mass—but not separate measures of natal food availability, group size, or genetic traits—was positively associated with survival to adulthood, suggesting juvenile body mass is indicative of natal condition. Heavier juveniles had greater body mass and had higher rates of annual survival as adults, independent of age. In contrast, there was no association between juvenile mass and adult telomere length attrition (a measure of somatic stress) nor annual reproduction. These results indicate that juvenile body mass, while not associated with senescence trajectories, can influence the likelihood of surviving to old age, potentially due to silver‐spoon effects. This study shows that measures of intrinsic condition in juveniles can provide important insights into the long‐term fitness of individuals in wild populations.

Psychoanalysis as Torat Hayim

Is there any reason for calling psychoanalysis a ‘Jewish science’? There is one, particularly significant: the affirmation of the act of birth thanks to which there emerges a new individual psychic life. In this article, I argue that the psychoanalysis which takes a positive view on the issue of separation is natalistic: it offers a particular philosophy of life, which chimes with the existential tenets of Jewish tradition. The Jewishness of psychoanalysis would thus manifest itself not so much in being a ‘science’, but in the way in which it follows the Jewish torat hayim, the ‘teaching of life’. The gist of this teaching lies in the specific attitude towards the human condition of natality: instead of trying to undo the trauma of birth, the Jewish singular life walks away from the place of its origin and never indulges in the phantasy of virtual return.

Integrating advances in population and evolutionary ecology with conservation strategy through long-term studies of red-billed choughs.

Conceptual and methodological advances in population and evolutionary ecology are often pursued with the ambition that they will help identify demographic, ecological and genetic constraints on population growth rate (λ), and ultimately facilitate evidence-based conservation. However, such advances are often decoupled from conservation practice, impeding translation of scientific understanding into effective conservation and of conservation-motivated research into wider conceptual understanding. We summarise key outcomes from long-term studies of a red-billed chough Pyrrhocorax pyrrhocorax population of conservation concern, where we proactively aimed to achieve the dual and interacting objectives of advancing population and evolutionary ecology and advancing effective conservation. Estimation of means, variances and covariances in key vital rates from individual-based demographic data identified temporal and spatial variation in subadult survival as key constraints on λ, and simultaneously provided new insights into how vital rates can vary as functions of demographic structure, natal conditions and parental life history. Targeted analyses showed that first-year survival increased with prey abundance, implying that food limitation may constrain λ. First-year survival then decreased dramatically, threatening population viability and prompting emergency supplementary feeding interventions. Detailed evaluations suggested that the interventions successfully increased first-year survival in some years and additionally increased adult survival and successful reproduction, thereby feeding back to inform intervention refinements and understanding of complex ecological constraints on λ. Genetic analyses revealed novel evidence of expression of a lethal recessive allele, and demonstrated how critically small effective population size can arise, thereby increasing inbreeding and loss of genetic variation. Population viability analyses parameterised with all available demographic and genetic data showed how ecological and genetic constraints can interact to limit population viability, and identified ecological management as of primacy over genetic management to ensure short-term persistence of the focal population. This case study demonstrates a full iteration through the sequence of primary science, evidence-based intervention, quantitative evaluation and feedback that is advocated in conservation science but still infrequently achieved. It thereby illustrates how pure science advances informed conservation actions to ensure the (short-term) stability of the target population, and how conservation-motivated analyses fed back to advance fundamental understanding of population processes.

Lower bound for the neutrino magnetic moment from kick velocities induced at the birth of neutron stars

We show that the neutrino chirality flip, which can take place in the core of a neutron star at birth, is an efficient process to allow neutrinos to anisotropically escape, thus providing a to induce the neutron star kick velocities. The process is not subject to the no-go theorem since although the flip from left- to right-handed neutrinos happens at equilibrium, the reverse process does not take place given that right-handed neutrinos do not interact with matter and therefore detailed balance is lost. For simplicity, we model the neutron star core as being made of strange quark matter. We find that the process is efficient when the neutrino magnetic moment is not smaller than [Formula: see text], where [Formula: see text] is the Bohr magneton. When this lower bound is combined with the most stringent upper bound, which uses the luminosity data obtained from the analysis of SN 1987A, our results set a range for the neutrino magnetic moment given by [Formula: see text]. The obtained kick velocities for natal conditions are consistent with the observed ones and span the correct range of radii for typical magnetic field intensities.

Neutron star kick velocity induced by neutrino chirality flip and a lower bound for the neutrino magnetic moment

We study the neutrino chirality flip during the birth of a neutron star, produced in a core made of strange quark matter. This mechanism is applied to the neutron star kick velocity problem and we show that it is efficient when the neutrino magnetic moment is not smaller than 4.7 × 10−15μB, where μB is the Bohr magneton. When this lower bound is combined with the most stringent upper bound, our results set a range for the neutrino magnetic moment given by 4.7 × 10−15 ≤ μν/μB ≤ (0.1 − 0.4) × 10−11. The obtained kick velocities for natal conditions are consistent with the observed ones and span the correct range of radii for typical magnetic field intensities.

Probing the Evolutionary History of Comets: An Investigation of the Hypervolatiles CO, CH4, and C2H6 in the Jupiter-family Comet 21P/Giacobini–Zinner

Abstract Understanding the cosmogonic record encoded in the parent volatiles stored in cometary nuclei requires investigating whether evolution (thermal or otherwise) has modified the composition of short-period comets during successive perihelion passages. As the most volatile molecules systematically observed in comets, the abundances of CO, CH4, and C2H6 in short-period comets may serve to elucidate the interplay between natal conditions and post-formative evolution in setting present-day composition, yet secure measurements of CO and CH4 in Jupiter-family comets (JFCs) are especially sparse. The highly favorable 2018 apparition of JFC 21P/Giacobini–Zinner enabled a sensitive search for these “hypervolatiles” in a prototypical carbon-chain depleted comet. We observed 21P/Giacobini–Zinner with the iSHELL spectrograph at the NASA Infrared Telescope Facility on four pre-perihelion dates, two dates near-perihelion, and one post-perihelion date. We obtained detections of CO, CH4, and C2H6 simultaneously with H2O on multiple dates. We present rotational temperatures, production rates, and mixing ratios. Combined with previous work, our results may indicate that the hypervolatile coma composition of 21P/Giacobini–Zinner was variable across apparitions as well as within a particular perihelion passage, yet the spread in these measurements is a relatively small fraction of the variation in each molecule from comet to comet. We discuss the implications of our measured hypervolatile content of 21P/Giacobini–Zinner for the evolution of JFCs, and place our results in the context of findings from the Rosetta mission and ground-based studies of comets.

Natal conditions, lifespan and lifetime reproductive success of European blackbirds

AbstractEven though much has been published in recent years on the factors affecting the lifespan and lifetime reproductive success of birds, there are still gaps in our knowledge. Here, we present the results of a long-term study of European blackbirds which examined the effect of natal conditions on lifespan and lifetime reproductive success (expressed by the number of fledglings) of 152 nestlings (72 males and 80 females) ringed in the Stefan Żeromski Park in Szczecin (NW Poland). We have complete information regarding parental age, family brood (first-egg laying date, clutch size, and hatching sequence), bird size, lifetime reproductive success, pair density and weather conditions during the natal year. For males, total fledgling production was the smaller, the later the laying date of the family brood, but increased with mean daily precipitation and pair density in the natal year. In the case of females, we did not find any significant relationships between their lifetime reproductive success and the above parameters. Male lifespan increased with mean daily precipitation and bird density, but only pair density had a positive effect on female lifespan. We suggest that for females, genetic factors could be more important for their reproductive success than for males. In addition, a blackbird’s lifespan depends strongly on environmental factors.

Significant Analysis of Microarray (SAM) to Identify Synergistic Effect of RV and NGF in Repairing Damaged Neuronal Cells

Neurodevelopmental disorders include diseases that are related with genetic disorders and are caused due to stress condition or environmental toxins during pre or post natal condition. In recent years, there is considerable research in neurodevelopmental disorders and examining therapeutic role of resveratrol as potential antioxidant. There is less information about the genes that are mutated or altered during neurodevelopmental phase and cause neuronal developmental disorders. Current researches are evidentially showing the therapeutic potential of Resveratrol (RV) and Nerve Growth Factor (NGF) against neuronal diseases. In current study Microarray experiment was designed to identify the genes that are altered when Mesenchymal Stem Cells (MSC) were exposed to Monocrotophos (MCP). MSCs were also coexposed with resveratrol and nerve growth factor to study the synergistic effect of NGF with RV. Computational analysis of microarray data was carried out through different software’s and bioinformatics tools to identify genes that are expressed in different samples across microarray experiment. Statistical methods like T-test, SAM analysis and clustering techniques were performed between different samples using MeV software. Through Significant Analysis of Microarray (SAM) method we identified positive and negative significant genes with respect to current study. Clustering method was used to cluster genes associated with neuronal disease genes. Key genes that were predicted on the basis of t-test and SAM analysis are DNMT1, PGAP1, RDX and PEX26 genes, these genes have noticeable function in different classes of neuronal diseases like cerebellar ataxia, deafness, narcolepsy, mental retardation and zellweger spectrum disorder etc. Cluster analysis we identified genes such as ATP6V0D1, TESMIN, TRIM22, NAPEPLD, CDK7 and PKM, these genes have important function in cell growth, cell proliferation, protein synthesis, cell cycle regulation, and cell signaling. Study suggests that exposure of damaged neuronal cells to RV and NGF enhances the expression of neuronal repair genes, thus signifies the neuroprotectant and synergistic activity of RV and NGF. “The data discussed in this publication have been deposited in NCBI’s Gene Expression Omnibus database and are accessible through GEO Series accession number GSE121261 (https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE121261).”

Experiencing El Niño conditions during early life reduces recruiting probabilities but not adult survival.

In wild long-lived animals, analysis of impacts of stressful natal conditions on adult performance has rarely embraced the entire age span, and the possibility that costs are expressed late in life has seldom been examined. Using 26 years of data from 8541 fledglings and 1310 adults of the blue-footed booby (Sula nebouxii), a marine bird that can live up to 23 years, we tested whether experiencing the warm waters and food scarcity associated with El Niño in the natal year reduces recruitment or survival over the adult lifetime. Warm water in the natal year reduced the probability of recruiting; each additional degree (°C) of water temperature meant a reduction of roughly 50% in fledglings' probability of returning to the natal colony as breeders. Warm water in the current year impacted adult survival, with greater effect at the oldest ages than during early adulthood. However, warm water in the natal year did not affect survival at any age over the adult lifespan. A previous study showed that early recruitment and widely spaced breeding allow boobies that experience warm waters in the natal year to achieve normal fledgling production over the first 10 years; our results now show that this reproductive effort incurs no survival penalty, not even late in life. This pattern is additional evidence of buffering against stressful natal conditions via life-history adjustments.

Age-related parental care in a long-lived bird: implications for offspring development

In long-lived species, behaviour is expected to vary across the lifespan, first improving with maturation and experience and then declining with senescence, but measurement is rare, particularly during old age. Measuring nest defence intensity in 255 known-age blue-footed boobies (Sula nebouxii) of 19 age classes confirmed the inverted-U pattern: intensity of nest defence increased in young males and females until roughly 11–12 years and declined progressively afterwards. We discuss the processes that may generate this distinctive pattern. Regardless of the underlying processes, this study establishes the existence of age-related variation in parental care in a long-lived species. Natural variation in natal conditions has recently been shown to have long-term impacts on development, so this study raises the question whether age-related changes in parental care generate systematic variation in offspring phenotypes. In theory, age-related change in parental care can result in differences among offspring produced at different ages. However, parental behaviour has never been measured over the whole age-span of any long-lived species because of the difficulty of sampling very old animals in the field. We measured intensity of nest defence over the age-span and confirmed that blue-footed boobies exhibit an age-related quadratic pattern in this parental behaviour: defence intensity increases in early life and declines progressively afterwards. Our results imply that similar-shaped patterns may exist in other components of parental care, such as feeding and social interaction, potentially affecting the long-term development of offspring.

Influence of Early Reproductive Success on Longevity and Late Reproductive Success in an Alpine Ungulate.

The life-history theories of aging predict lifetime trade-offs between early reproductive allocation and late-life survival, reproduction, or both components of fitness. Recent studies in wild populations have found evidence for these early-late life trade-offs, but rarely have they been found across multiple traits while exploring the additional effects of variation in environmental conditions and individual quality. Benefiting from longitudinal data on adult female mountain goats (Oreamnos americanus), we investigated the influence of age at first reproduction (AFR) and early reproductive success (ERS) on longevity, late reproductive success, and senescence rates while accounting for the influence of natal environmental conditions and individual quality. Contrary to predictions, we did not find evidence for early-late life trade-offs. Instead, an earlier AFR and a greater ERS had positive but weak direct effects on late reproductive success. Natal population density, however, was the strongest determinant of all life-history traits, having a direct negative effect on female longevity, late reproductive success, AFR, and ERS. Although natal density reduced the probability of annual reproduction and annual survival during adulthood, higher allocation to reproduction in early life and poorer natal conditions did not lead to accelerated rates of senescence during adulthood. The results of this investigation provide an integrated picture of early-late life trade-offs, underscoring the importance of accounting for environmental conditions because of their potentially strong implications for population dynamics.

The Robot Condition: Karel Čapek's R.U.R. and Hannah Arendt on Labor, Technology, and Innovation

ABSTRACTThis article reads Karel Čapek's R.U.R. through the lens of Hannah Arendt's critique of technology in The Human Condition. Arendt and Čapek share a suspicion that modernity's attempts to overcome labor through the use of technology undermines the human condition of natality. Indeed, the revolt of Čapek's Robots dramatizes Arendt's warnings of the dangers of a “society of laborers without labor” and “world alienation.” Both thinkers suggest that the dilemmas posed by modern technology cannot be resolved through “practical” means but require loving attentiveness to the fragile conditions in which genuine natality can emerge.

Sex-specific pathways of parental age effects on offspring lifetime reproductive success in a long-lived seabird.

The conditions under which individuals are reared vary and sensitivity of offspring to such variation is often sex-dependent. Parental age is one important natal condition with consequences for aspects of offspring fitness, but reports are mostly limited to short-term fitness consequences and do not take into account offspring sex. Here we used individual-based data from a large colony of a long-lived seabird, the common tern Sterna hirundo, to investigate longitudinal long-term fitness consequences of parental age in relation to both offspring and parental sex. We found that recruited daughters from older mothers suffered from reduced annual reproductive success. Recruited sons from older fathers were found to suffer from reduced life span. Both effects translated to reductions in offspring lifetime reproductive success. Besides revealing novel sex-specific pathways of transgenerational parental age effects on offspring fitness, which inspire studies of potential underlying mechanisms, our analyses show that reproductive senescence is only observed in the common tern when including transgenerational age effects. In general, our study shows that estimates of selective pressures underlying the evolution of senescence, as well as processes such as age-dependent mate choice and sex allocation, will depend on whether causal transgenerational effects exist and are taken into account.