Parental care is not the rule in fishes. Most species are quite content to abandon their offspring to the vagaries of a world populated by organisms that are fond of eating nutritious little snacks such as eggs and fry. These non-parental fishes may show discrimination as to where the eggs are deposited (covered by gravel in salmon, in thick mats of weeds for some minnows, in open water downstr...

Research has shown that human partners are more similar than expected by chance on a variety of traits. Studies examining hair and eye colour show some evidence of positive assortment. Positive assortment may reflect attraction to self-similar characteristics but is also consistent with attraction to parental traits. Here, we examine self-reported partner hair and eye colour and the influence t...

We present 29 optical spectra of the normal Type Ia SN 1998aq, ranging from 9 days before to 241 days after the time of maximum brightness. This spectrocopic data set, together with photometric data presented elsewhere, makes SN 1998aq one of the best observed Type Ia supernovae at optical wavelengths. We use the parameterized supernova synthetic–spectrum code Synow to study line identification...

In this article we report a graded relationship between neighborhood socioeconomic status (SES) and children’s antisocial behavior that (1) can be observed at school entry, (2) widens across childhood, (3) remains after controlling for family-level SES and risk, and (4) is completely mediated by maternal warmth and parental monitoring (defined throughout as supportive parenting). Children were ...

Preliminary communication The aim of the operation of the security control system at an airport is the prevention of the introduction of forbidden objects to the restricted area of the airport or onto the plane. All passengers and their luggage undergo security control. The security control system is a very specific system. On the one hand, the security control must be performed effectively so ...

Intraspecific brood parasitism and cooperative breeding can be considered extremes on a continuum of parental care investment by a secondary female that visits the nest of a primary female. However, we lack a theoretical framework that predicts exactly where a secondary female will fall along this continuum. In this paper I present a model that predicts the fraction of a nesting period during w...

Mating systems and parental care are predicted to coevolve because the former dictates the cost–benefit ratio of the latter by affecting genetic relatedness between adults and offspring. Reptiles show only rudimentary forms of sociality and parental care and, hence, could provide important insights into the early stages of the evolution and maintenance of social systems. The skink genus Egernia...

We explored behavioural adjustments made by parent house sparrows, Passer domesticus, when the nutritional condition of their dependent nestlings was improved experimentally. Male parents responded to artificially supplemented broods by increasing food deliveries, whereas female parents continued matching the already high rate of control females. Thus, parental care was not truncated in the fac...

Given that parenthood is considered a central adult status with developmental implications, and an increasing number of adults are childless, we assessed whether adult development is structured differently for parents and non-parents. This study’s main goal was to assess and compare the connection between generativity development—a key task of middle adulthood—and psychological well-being for c...

Purpose – The purpose of this paper is to report the results of a randomized controlled trial designed to measure the impact of a parental training program on the nutritional status of primary school students in rural Shaanxi Province, in northwest China. Design/methodology/approach – Using hemoglobin (Hb) levels as the outcome variable, the authors first measure the overall impact of a nutriti...