Biological paternity, social maternity: on abortion and infanticide as unrecognized indicators of the cultural character of maternity.
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Abortion, Spontaneous↗
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Plasma levels of androgens and cortisol in relation to breeding behavior in parental male bluegill sunfish, Lepomis macrochirus.
Like many teleosts, male bluegill sunfish (Lepomis macrochirus) provide sole parental care. To understand some of the proximate costs of parental care, we measured body condition and plasma levels of testosterone (T), 11-ketotestosterone (11KT) and cortisol in nesting bluegill males during pre-spawning, spawning and parental care stages. T and 11KT were at their highest mean levels during the pre-spawning period and decreased to lower levels early during the parental care period before rising again when the eggs hatched. Cortisol levels fluctuated across the breeding stages, but there was a noticeable increase from low levels on the day of spawning during the first 2 days of parental care when egg fanning is most intense. Levels of all hormones varied considerably among males, with androgen levels often correlating positively with a male's body condition. We also demonstrate, using a brood reduction experiment and repeated sampling of known individuals, that the presence of eggs affects hormone levels shortly after eggs hatch. Parental males in better body condition had higher levels of androgens during parental care. Males that were known to renest later in the season also had higher androgen levels and were in better body condition during the first nesting bout than males only known to have nested once. However, circulating levels of cortisol did not differ significantly between these groups. We discuss our findings in the context of proximate and ultimate costs of parental care and propose several reasons why elevated androgen levels may not be as incompatible with the expression of paternal care in male teleosts, as compared with avian and mammalian fathers.
Animals↗
Aggression and paternal absence: racial-ethnic differences among inner-city boys.
Aggression scores were obtained for 132 preadolescent inner-city males to test the hypothesis that paternal absence may differentially influence aggressive behavior. A statistically significant, two-way race by paternal absence interaction (p less than .01) indicated that, when compared to their racial-ethnic counterparts living with both parents, father-absent Puerto Ricans were equally as aggressive, father-absent blacks were less aggressive, and father-absent whites were more aggressive. Tentative interpretations of these findings were developed with a view to the demographic realities of an American inner-city.
Adolescent↗
Racial discrepancies in the association between paternal vs. maternal educational level and risk of low birthweight in Washington State.
BACKGROUND: The role of paternal factors in determining the risk of adverse pregnancy outcomes has received less attention than maternal factors. Similarly, the interaction between the effects of race and socioeconomic status (SES) on pregnancy outcomes is not well known. Our objective was to assess the relative importance of paternal vs. maternal education in relation to risk of low birth weight (LBW) across different racial groups. METHODS: We conducted a retrospective population-based cohort study using Washington state birth certificate data from 1992 to 1996 (n = 264,789). We assessed the associations between maternal or paternal education and LBW, adjusting for demographic variables, health services factors, and maternal behavioral and obstetrical factors. RESULTS: Paternal educational level was independently associated with LBW after adjustment for race, maternal education, demographic characteristics, health services factors; and other maternal factors. We found an interaction between the race and maternal education on risk of LBW. In whites, maternal education was independently associated with LBW. However, in the remainder of the sample, maternal education had a minimal effect on LBW. CONCLUSIONS: The degree of association between maternal education and LBW delivery was different in whites than in members of other racial groups. Paternal education was associated with LBW in both whites and non-whites. Further studies are needed to understand why maternal education may impact pregnancy outcomes differently depending on race and why paternal education may play a more important role than maternal education in some racial categories.
Journal Article↗
Paternal alcoholism, parental psychopathology, and aggravation with infants.
The purpose of this study was to examine the role of paternal alcohol problems, antisocial behavior, and depression in predicting parental attitudes toward their 12-month-old infants. Families were recruited from birth records and the final sample consisted of 216 families, 101 in the control group and 115 families with alcoholic fathers (92 with light drinking partners and 23 with heavy drinking partners). Results indicated that fathers' alcoholism was associated with higher paternal aggravation with the infant. Further, fathers' depression mediated the relationship between fathers' current alcohol problems and aggravation. Fathers' alcoholism was indirectly associated with maternal aggravation and warmth through the relationship with maternal antisocial behavior and depression. Results suggest that at least during early infancy, parental psychopathology associated with fathers' alcohol problems may play a more important role in predicting parental attitudes toward their infants than alcoholism per se. Results are further discussed in terms of their implications for parenting and later development among infants of alcoholics.
Adult↗
Proximate mechanisms of reproductive monopolization in male moustached tamarins (Saguinus mystax).
In moustached tamarin (Saguinus mystax) groups, the single breeding female mates polyandrously with most or all nonrelated adult males. Nonetheless, paternity is monopolized in many groups by a single male. No evidence for male endocrine suppression has been found in this species. The proximate mechanisms of monopolization thus remain poorly understood. The aim of this study was to investigate the possible impact of agonistic interactions and mate-guarding on the monopolization of paternity in male moustached tamarins. Furthermore, we evaluated the likely costs of these behaviors, and whether olfactory cues might be used for its timing. We used behavioral data on proximity, agonistic interactions, time budgets, and scent-marking behavior to answer these questions. While direct agonistic competition does not play a prominent role, fertile females were consorted in some periods by one male, the sire of the previous and next litter. Consorting was instigated nearly exclusively by the male. It probably occurred during the female's periods of highest fertility, and thus likely functions as mate-guarding. The timing of the consortship was probably guided by olfactory cues in the female's scent marks. While we did not obtain direct evidence for energy costs in terms of increased energy expenditure or decreased food intake, we found that consorting males are more conspicuous and therefore may be more vulnerable to predators.
Agonistic Behavior↗
Contact-promoting behavior, social development, and relationship with parents in sibling juvenile degus (Octodon degus).
This study describes infant socialization in captive parent-young units of the caviomorph rodent Octodon degus. Types of parent-young contact (huddling or squatting) and social interaction (body nosing and accompanying behaviors) are described and their ontogenetic trends examined between postnatal Days 1 and 46. Fathers spent less time than mothers in contact with the young. Mother-young contact decreased postnatally, whereas the amounts of mother-young and father-young social interaction, measured in terms of body-nosing exchanges, showed a continuous increase postnatally; sibling interactions also showed a continuous increase. Father-young interactions tended to be dominated by the father. Young reared with the father cohabiting huddled less with their mother, and engaged in less body-nosing, than young reared in the father's absence. Observations suggested that paternal control of the young may curb juvenile interactions. Young observed without their parents in an unfamiliar enclosure did not groom or "play" as in their home cage with parents present, but engaged in relatively more vocalizing, neck-nosing and forepaw-clasping.
Animals↗
Individual and combined effects of postpartum depression in mothers and fathers on parenting behavior.
BACKGROUND: Pediatric anticipatory guidance has been associated with parenting behaviors that promote positive infant development. Maternal postpartum depression is known to negatively affect parenting and may prevent mothers from following anticipatory guidance. The effects of postpartum depression in fathers on parenting is understudied. OBJECTIVE: Our purpose with this work was to examine the effects of maternal and paternal depression on parenting behaviors consistent with anticipatory guidance recommendations. METHODS: The 9-month-old wave of data from a national study of children and their families, the Early Childhood Longitudinal Study, provided data on 5089 2-parent families. Depressive symptoms were measured with a short form of the Center for Epidemiologic Studies Depression Scale. Interviews with both parents provided data on parent health behaviors and parent-infant interactions. Logistic and linear regression models were used to estimate the association between depression in each parent and the parenting behaviors of interest. These models were adjusted for demographic and socioeconomic status indicators. RESULTS: In this national sample, 14% of mothers and 10% of fathers exhibited levels of depressive symptoms on the Center for Epidemiologic Studies Depression Scale that have been associated with clinical diagnoses, confirming other findings of a high prevalence of postpartum maternal depression but highlighting that postpartum depression is a significant issue for fathers as well. Mothers who were depressed were approximately 1.5 times more likely to engage in less healthy feeding and sleep practices with their infant. In both mothers and fathers, depressive symptoms were negatively associated with positive enrichment activity with the child (reading, singing songs, and telling stories). CONCLUSIONS: Postpartum depression is a significant problem in both mothers and fathers in the United States. It is associated with undesirable parent health behaviors and fewer positive parent-infant interactions.
Adult↗
When infants look to their parents: I. Infants' social referencing of mothers compared to fathers.
12-month-olds were seen with their mothers and fathers in a laboratory procedure designed to compare infants' solicitation of, emotional resonance to, and self-regulation on the basis of happy, fearful, and conflicting emotional signals from mothers versus fathers. Measures of positive and negative affect and affect lability; of look, approach, and proximity behavior; and of overall response pattern were obtained. Infants showed more positive and less negative affect and greater toy proximity with happy compared to fearful signals. Few differences emerged in infants' referencing response to mothers versus fathers. Infants looked more to mothers than fathers when no signals were given but did not differentiate between parents when only one was signaling or when both were signaling (conflict). In affective state and behavioral regulation, they were not differentially responsive to maternal versus paternal signals either when only one parent was signaling or when both were giving signals.
Arousal↗
Male and female prolactin receptor mRNA expression in the brain of a biparental and a uniparental hamster, phodopus, before and after the birth of a litter.
Prolactin receptor (PRL-R) mRNA transcript level was quantified in the choroid plexus (ChP) of a naturally biparental hamster, Phodopus campbelli, and its otherwise similar, yet nonpaternal, sibling species, Phodopus sungorus. Pair-housed males and females on the day before the birth of their first litter (G17), the day after birth (L1), lactation day 5 (L5), and unpaired animals that were sexually naïve, were tested. PRL-R mRNA transcript level relative to total RNA, was evaluated by reverse transcriptase-polymerase chain reaction using primers common to the long- and short-form of the PRL-R in Phodopus. In the ChP, a region implicated in prolactin transport into the central nervous system, females had the expected increase in PRL-R mRNA transcript from dioestrus to L5, consistent with known actions of prolactin. As predicted, males and females of the biparental species were similar, although PRL-R mRNA in naive males was higher than in dioestrus females. Males of the two species also differed as predicted. PRL-R mRNA transcript levels were higher in the biparental males. In addition, P. campbelli males had low PRL-R mRNA at G17 compared to L5. By contrast, non-paternal P. sungorus males had elevated PRL-R mRNA transcript levels on G17 relative to unpaired males. We conclude that PRL-R mRNA in the ChP is differentially regulated before and after birth in a paternal and a nonpaternal male.
Amino Acid Sequence↗
Intensive genetic assessment of the mating system and reproductive success in a semi-closed population of the mottled sculpin, Cottus bairdi.
Most genetic surveys of parentage in nature sample only a small fraction of the breeding population. Here we apply microsatellite markers to deduce the genetic mating system and assess the reproductive success of females and males in an extensively collected, semi-closed stream population of the mottled sculpin fish, Cottus bairdi. In this species, males guard nest rocks where females deposit the eggs for fertilization. The potential exists for both males and females to mate with multiple partners and for males to provide parental care to genetically unrelated offspring. Four hundred and fifty-five adults and subadults, as well as 1,259 offspring from 23 nests, were genotyped at five polymorphic microsatellite loci. Multilocus maternal genotypes, deduced via genetic analyses of embryos, were reconstructed for more than 90% of the analysed nests, thus allowing both male and female reproductive success to be estimated accurately. There was no genetic evidence for cuckoldry, but one nest probably represents a takeover event. Successful males spawned with a mean of 2.8 partners, whereas each female apparently deposited her entire clutch of eggs in a single nest (mean fecundity = 66 eggs/female). On average, genetically deduced sires and dams were captured 1.6 and 9.3 metres from their respective nests, indicating little movement by breeders during the spawning season. Based on a 'genetic mark-recapture' estimate, the total number of potentially breeding adults (c. 570) was an order-of-magnitude larger than genetically based estimates of the effective number of breeders (c. 54). In addition, significantly fewer eggs per female were deposited in single than in multidam nests. Not only were perceived high-quality males spawning with multiple partners, but they were receiving more eggs from each female.
Animals↗
The end of paternalism?
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Cooperative Behavior↗
Mothers, not fathers, determine the delayed onset of male carrying in Goeldi's monkey (Callimico goeldii).
In biparental species, females are thought to accept and even to seek male assistance in rearing of the young. In this study, we present data that suggests that Goeldi's monkey females (Callimico goeldii) actually reject male parental care for a certain period. In Callimico, which have biparental care, mothers carry the infant exclusively for the first three weeks despite the fact that fathers are interested in their infants directly after birth. Fathers initiated significantly more body contact with their mates when newborn infants were present and retrieved one-day-old infants that were experimentally presented to them. The onset of paternal carrying in our colony was 27.5 days compared to 11.5 days (medians) observed in the field. However, presentation of a live potential predator induced earlier onset of paternal carrying by about 10 days. Additional costs to maternal carrying such as foraging and predator avoidance are likely factors influencing the decision of the mother as to when to share the cost of infant carrying with the father. We conclude that Goeldi's monkey fathers start carrying their infants so late because they do not get them earlier from the mother. We suggest that one ultimate explanation for that delay might be increased infant mortality when infant transfer starts at an earlier stage.
Animals↗
Maternal employment in a family context: effects on infant-mother and infant-father attachments.
The relation between resumption of full-time employment by mothers of infants under 6 months of age, and subsequent infant-mother and infant-father attachments, was examined in this study. Attachment classifications and ratings of reunion behavior with mother and with father in Ainsworth's Strange Situation at 12 months were obtained for 57 nonemployed-mother families and 40 employed-mother families. No relation emerged between maternal work status and the quality of infants' attachments to their mothers, indicating that early resumption of employment may not impede the development of secure infant-mother attachment. A significantly higher proportion of insecure attachments to fathers in employed-mother families was found for sons but not for daughters. Joint examination of the infants' attachments to both parents revealed a trend suggesting that in employed-mother families, boys were more likely to be insecurely attached to both parents than were girls in employed-mother families or infants of either sex in nonemployed-mother families. These patterns are discussed in light of differences in maternal and paternal sex-typing behavior and of evidence suggesting boys' vulnerability to psychosocial stress.
Child Development↗
Steroid hormones and paternal care in the plainfin midshipman fish (Porichthys notatus).
The present study investigated the relationship between plasma steroid hormone levels and the expression ofpaternal behavior in the plainfin midshipman fish (Porichthys notatus), where males may simultaneously care for multiple clutches in different stages of development. Blood samples were collected from free-living parental males during that part of the breeding season when males may be found in various stages of parental care. Plasma 11-ketotestosterone levels were significantly higher in males with empty nests and nests containing only eggs than in males with nests containing embryos. All males with nests containing embryos had undetectable testosterone levels, whereas testosterone levels were detectable in many males with empty nests or nests containing only eggs. Estradiol levels were detectable in only a few males from nests with no eggs or nests containing only eggs. Cortisol levels were not correlated with stage of paternal care or with handling time. These results follow the frequently reported vertebrate pattern of declining androgen levels over the course of the breeding season or during the period of parental care. However, many male midshipman guarding nests containing only eggs had androgen levels similar to those of males whose nests contained no offspring. Thus the pattern of androgen levels exhibited by reproductively active parental male midshipman may reflect a compromise between investment in paternal care versus courtship and/or territoriality.
Animals↗
Androgen and behavior in the male three-spined stickleback, Gasterosteus aculeatus. II. Castration and 11-ketoandrostenedione effects on courtship and parental care during the nesting cycle.
Courtship declines and ceases while parental care increases in the presence of developing eggs during the nesting cycle of the male three-spined stickleback, Gasterosteus aculeatus. Furthermore, circulating 11-ketotestosterone (11KT) levels are higher during the initial "courtship phase" than during the later "parental phase," similar to that found in other paternal fishes. This study aimed to investigate a possible functional relationship between changes in 11KT levels and changes in reproductive behavior during the nesting cycle. To this end, groups of nonspawned and spawned male sticklebacks were sham-operated, castrated, or castrated and treated with 11-ketoandrostenedione (11KA), and the effects of the treatments on courtship and parental care were studied. Castration removed circulating 11KT, while 11KA replacement prevented the natural decline in 11KT during the parental phase (11KA converts to 11KT extratesticularly), as assessed by radioimmunoassay. Regardless of treatment, parental care remained low and courtship was present in all nonspawned males, even at the end of the experiment. However, courtship did eventually decline in castrated nonspawned males compared to the other two nonspawned groups. In all treatments of spawned males there was a drastic decline in courtship and an increase in parental care. In castrated spawned males, however, the decline in courtship came earlier than in the other two spawned groups. 11KA treatment did not prevent the natural decline in courtship/increase in parental care in spawned males, indicating that the natural decline in 11KT is not responsible for the main portion of the rapid changes in these behaviors over the stickleback's nesting cycle. The limited effects of castration also exclude other gonadal hormones from being responsible for most of these changes.
Androgens↗
[Smoking, fertility and very preterm birth].
In France, many couples in procreating age continue to smoke, despite recommendations to stop smoking before or during pregnancy. We reviewed the epidemiological associations between maternal or paternal smoking and both infertility and very preterm birth. It appears clearly that maternal smoking impairs natural and assisted fecundity. Furthermore, maternal smoking enhances the rate of ectopic pregnancies and spontaneous abortions. The role of maternal smoking on very preterm birth before 33 weeks of completed gestation appears in recent population based-study or case-control studies that include several hundred very preterm neonates. But the role of smoking on very preterm birth among hypertensive mothers and primiparae is still debated. The detrimental effect of smoking on fecundity appears to be reversible when the mother and father stop smoking. The real effect of interventions promoting cessation of smoking during pregnancy in reducing the rate of very preterm births remains to be studied.
Abortion, Spontaneous↗
Sex differences in razorbill Alca torda parent-offspring vocal recognition.
We investigated differences in parent-offspring vocal recognition between males and females in a natural population of razorbills Alca torda, a long-lived and highly social species of auk (Family: Alcidae). Razorbills provide biparental care to their chicks while at the nest site, after which the male is the sole caregiver for an additional period at sea. Parent-offspring recognition in razorbills is most challenging once the chick becomes mobile, leaves the nest site and goes to sea with the male parent. It is during this period when selection pressure acting on recognition behaviour is expected to be strongest. As a result, we predicted that parent-offspring recognition would be better developed in the male parent, that is, show a paternal bias. To test this prediction we used vocal playback experiments conducted on breeding razorbills at the Gannet Islands, Labrador, Canada. We found (1) most positive responses to playbacks (vocal and phonotactic) occurred close to fledging, (2) males responded more to calls from their chicks than to calls from strange chicks, (3) females responded indifferently to calls from their own or strange chicks and (4) chicks responded more to calls from their male parent than to calls from other adult males. The results provide clear evidence of mutual vocal recognition between the male parent and the chick but not between the female parent and the chick, supporting the prediction that parent-offspring recognition is male biased in this species. Such a bias could have important social implications for a variety of behavioural and basic life history traits such as cooperation and sex-biased dispersal.
Animals↗