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1.
The history of abortion in China is closely linked to the evolution of the country's population policy over the past four decades. Abortion in China has been legal since 1953 and is widely available through services offered by the country's national family planning program. In 1971, following the uncertain period of the Cultural Revolution (1965–1968), the government of China, confronting the reality of its population size — which in 1970 was estimated by the United Nations at 800 million people — decided to make a concerted effort to lower demographic growth by means of an effective birth planning campaign and services, backed up with legal and safe abortion. Within a decade, in 1979, China strengthened its policy and imposed on the population a reproductive norm allowing for only one child, known as the One-Child Family Policy. Ethnic minorities were at first exempt from demographic policies but more recently pressure has been increasingly applied to them to control their fertility. Abortion is now prevalent among nearly all Chinese ethnic minorities. Because of their remoteness and less favorable socio-economic circumstances, minorities lack access to quality services that would lower or make abortion unnecessary. The paper represents an effort to reverse the gap and confusion in the existing literature on ethnic group response to population and family planning policies in China.  相似文献   

2.
Zilberberg J 《Bioethics》2007,21(9):517-519
Sex selection in India and China is fostered by a limiting social structure that disallows women from performing the roles that men perform, and relegates women to a lower status level. Individual parents and individual families benefit concretely from having a son born into the family, while society, and girls and women as a group, are harmed by the widespread practice of sex selection. Sex selection reinforces oppression of women and girls. Sex selection is best addressed by ameliorating the situations of women and girls, increasing their autonomy, and elevating their status in society. One might argue that restricting or prohibiting abortion, prohibiting sex selection, and prohibiting sex determination would eliminate sex selective abortion. But this decreases women's autonomy rather than increases it. Such practices will turn underground. Sex selective infanticide, and slower death by long term neglect, could increase. If abortion is restricted, the burden is placed on women seeking abortions to show that they have a legally acceptable or legitimate reason for a desired abortion, and this seriously limits women's autonomy. Instead of restricting abortion, banning sex selection, and sex determination, it is better to address the practice of sex selection by elevating the status of women and empowering women so that giving birth to a girl is a real and positive option, instead of a detriment to the parents and family as it is currently. But, if a ban on sex selective abortion or a ban on sex determination is indeed instituted, then wider social change promoting women's status in society should be instituted simultaneously.  相似文献   

3.
The field of bioethics emerged in the late 1960s and early 1970s. Among its early issues were the protection of human research subjects, the rights of patients, abortion, and reproductive issues. Partly as a reflection of the times, and of those issues, the field became focused on autonomy and individual rights, and liberal individualism came to be the dominant ideology in the 1980s and 1990s. Communitarianism, as an alternative ideology focused more on the common good and the public interest than on autonomy, was a neglected approach. But many bioethical issues can not reasonably be reduced to questions of individualism and choice only. Issues of genetics and reproduction will of necessity touch on the society as a whole, its values, and its social institutions. Serious ethical analysis must take the social implications seriously and not simply assume that they should be left to autonomous choices of individuals. Human beings are social animals and our nature is distorted if we think of ourselves only as co-existing social atoms. Various approaches to communitarianism are outlined, and the question of the relationship between individual good and common good is confronted.  相似文献   

4.
Non-medical sex selection is premised on the notion that the sexes are not interchangeable. Studies of individuals who undergo sex selection for non-medical reasons, or who have a preference for a son or daughter, show that they assume their child will conform to the stereotypical roles and norms associated with their sex. However, the evidence currently available has not succeeded in showing that the gender traits and inclinations sought are caused by a “male brain” or a “female brain”. Therefore, as far as we know, there is no biological reason why parents cannot have the kind of parenting experience they seek with a child of any sex. Yet gender essentialism, a set of unfounded assumptions about the sexes which pervade society and underpin sexism, prevents parents from realising this freedom. In other words, unfounded assumptions about gender constrain not only a child’s autonomy, but also the parent’s. To date, reproductive autonomy in relation to sex selection has predominantly been regarded merely as the freedom to choose the sex of one’s child. This paper points to at least two interpretations of reproductive autonomy and argues that sex selection, by being premised on gender essentialism and/or the social pressure on parents to ensure their children conform to gender norms, undermines reproductive autonomy on both accounts.  相似文献   

5.
ANNE DONCHIN 《Bioethics》2009,23(1):28-38
The recent case of the UK woman who lost her legal struggle to be impregnated with her own frozen embryos, raises critical issues about the meaning of reproductive autonomy and the scope of regulatory practices. I revisit this case within the context of contemporary debate about the moral and legal dimensions of assisted reproduction. I argue that the gender neutral context that frames discussion of regulatory practices is unjust unless it gives appropriate consideration to the different positions women and men occupy in relation to reproductive processes and their options for autonomous choice. First, I consider relevant legal rulings, media debate, and scholarly commentary. Then I discuss the concept of reproductive autonomy imbedded in this debate. I argue that this concept conflates informed consent and reproductive autonomy, thereby providing an excessively narrow reading of autonomy that fails to give due regard to relations among individuals or the social, political and economic environment that shapes their options. I contrast this notion of autonomy with feminist formulations that seek to preserve respect for the agency of individuals without severing them from the conditions of their embodiment, their surrounding social relationships, or the political contexts that shape their options. Taking these considerations into account I weigh the advantages of regulation over the commercial market arrangement that prevails in some countries and suggest general guidelines for a regulatory policy that would more equitably resolve conflicting claims to reproductive autonomy.  相似文献   

6.
灵长类社会中存在着非母亲成员(成年雌猴、青少年猴和成年雄猴)对婴儿的照料行为,即非母亲照料行为,该行为直接影响新生婴儿的存活与发育以及婴儿母亲的日常活动,是灵长类学研究领域的热点问题.本研究于2019年3月至2019年11月,采用焦点动物取样和瞬时扫描取样,探究了川金丝猴非母亲照料行为的影响因素及其对母亲活动分配的影响...  相似文献   

7.
OBJECTIVE: To determine rates of suicide associated with pregnancy by the type of pregnancy. DESIGN: Register linkage study. Information on suicides in women of reproductive age was linked with the Finnish birth, abortion, and hospital discharge registers to find out how many women who committed suicide had had a completed pregnancy during her last year of life. SETTING: Nationwide data from Finland. SUBJECTS: Women who committed suicide in 1987-94. RESULTS: There were 73 suicides associated with pregnancy, representing 5.4% of all suicides in women in this age group. The mean annual suicide rate was 11.3 per 100,000. The suicide rate associated with birth was significantly lower (5.9) and the rates associated with miscarriage (18.1) and induced abortion (34.7) were significantly higher than in the population. The risk associated with birth was higher among teenagers and that associated with abortion was increased in all age groups. Women who had committed a suicide tended to come from lower social classes and were more likely to be unmarried than other women who had had a completed pregnancy. CONCLUSIONS: The increased risk of suicide after an induced abortion indicates either common risk factors for both or harmful effects of induced abortion on mental health.  相似文献   

8.
Birth site location can have enormous implications for female reproductive success. Some ungulate species demonstrate consistent birth site fidelity, while others shift birth locations during their lifetimes as a function of ecological and social factors. We plotted 39 years of birth records from a wild population of Thornicroft's giraffe, Giraffa camelopardalis thornicrofti, to test the hypothesis that giraffe use consistent locations for birth. Data from 29 calves born to nine females revealed that birth seasonality was absent and that ecological zone had no significant impact on birth locations. Consecutive births by individual females were not limited to certain locations, with the distance between sequential birth sites tending to be greater if a calf failed to survive the first year of life. Our evidence conflicts with the suggestion that giraffe cows regularly return to special locations for bearing calves. We suggest that the choice of birth location is a function of nonseasonal breeding, predator pressure and extensive variation in microhabitat characteristics within ecological zones. Female giraffe have evolved a flexible reproductive strategy, whereby they regulate choice of birth site location based upon their past reproductive history, current ecological conditions (including both resource availability and predator pressure) and present social surroundings.  相似文献   

9.
In many countries, prenatal testing for certain fetal abnormalities is offered via publicly funded screening programs. The concept of reproductive autonomy is regarded as providing a justificatory basis for many such programs. The purpose of this study is to re‐examine the normative basis of public prenatal screening for fetal abnormalities by changing our perspective from that of autonomy to obligation. After clarifying the understanding of autonomy adopted in the justification for public prenatal screening programs, we identify two problems concerning this justification: first, the extent to which the government is obliged to meet this demand is not evident; and, second, it is not clear whether the provision of public screening is the most appropriate way to promote autonomy. Next, to tackle these problems, we focus on Onora O’Neill’s argument of rights and obligations. Drawing on this argument, we show that, in addressing the problems above, it is important to change our normative perspective from rights or autonomy to obligation. Our argument will show that since the government does not have an incontrovertibly fundamental obligation to promote autonomy, this obligation needs to be constrained in terms of compatibility with other fundamental obligations. In addition, even if a government is obliged to promote autonomy to some degree, there could be more appropriate means to achieve it than providing public prenatal screening; therefore, it is not necessary for government obligations to extend to the provision of public prenatal screening.  相似文献   

10.
Chinese traditional medicine and abnormal sex ratio at birth in China   总被引:2,自引:0,他引:2  
A study of the abnormal sex ratio at birth in China reveals that it is not an entirely new phenomenon that emerged since the 1980s, but is simply more visible at present. Deliberate intervention to determine the sex of children has existed in the past few decades, at least in certain groups. Apart from modern medical methods, traditional Chinese medical practice is shown to be highly accurate in identifying the sex of a fetus. This may lead to sex-selective abortion and an abnormal sex ratio at birth. The possible causes of the abnormal sex ratio at birth include not only the real imbalance due to the disturbance of social factors, but also a spurious one attributable to the undercounting of female births. The real magnitude of the imbalance has been exaggerated by statistical error. The phenomenon is a complicated one reflecting the comprehensive socioeconomic setting. Among these factors, the stage of the fertility transition is one of the most decisive.  相似文献   

11.
Upon first consideration, the desire of an individual to amputate a seemingly healthy limb is a foreign, perhaps unsettling, concept. It is, however, a reality faced by those who suffer from body integrity identity disorder (BIID). In seeking treatment, these individuals request surgery that challenges both the statutory provisions that sanction surgical operations and the limits of consent as a defence in New Zealand. In doing so, questions as to the influence of public policy and the extent of personal autonomy become important. Beyond legal issues, BIID confronts dominant conceptions of bodily integrity, medical treatment, and ethical obligations. This paper seeks to identify the relevant public policy concerns raised by BIID in New Zealand and the limits of autonomy, before moving on to consider how BIID sufferers may legally seek the treatment they require and how a doctor might be protected from criminal proceedings for assault for performing this treatment. It will be argued that it is possible to legally consent to the amputation of a healthy limb as medical treatment and that public perception should not be allowed to take precedence over this right.  相似文献   

12.
The sociodemographic characteristics of abortion seekers and the reasons they give for procuring termination were studied in 356 clients selected from two abortion clinics in the city of Colombo. Nearly 80% were Buddhists and about 10% were Christians. Almost all had some formal education but only 20% were employed outside the home. Over 95% were currently married and at the peak of their childbearing age. More than one-half were aged 30 years or over, while adolescents only constituted about 3%. Fourteen per cent were nulliparous and about two-thirds had one or two living children at the time of obtaining the abortion. A significantly high proportion also had a very young child. In total, the 356 women had had 1130 pregnancies, and the mean rate of abortion was 42 per 100 pregnancies. Over one-quarter had had more than one abortion and about 10% had had three or more. Almost all abortions were performed within the first trimester with a mean gestation period of 6 weeks. About one-third of the clients were using some method of contraception at the time they became pregnant. The most common reasons cited for the present abortion were 'pregnancy too soon after previous delivery', 'no more children desired' or 'curtailment of opportunity for foreign employment'. Unmarried women constitute a special group of abortion seekers who have different needs and behave differently from married women. Their needs are not currently being met by reproductive health programmes in Sri Lanka, and it is important that they should be given special attention in the future. An interesting finding is that a significant minority of the abortion seekers answered negatively to the question regarding providing medical facilities for abortions without difficulty. This underscores the ambivalence many people have to abortion.  相似文献   

13.
Current research and policies on reproductive behaviours in many East African countries focus primarily on proxy indicators of women's autonomy, and very little emphasis is placed on direct indicators of women's autonomy. In this paper, data from the 2002 Eritrea Demographic and Health Survey (EDHS) are used to address some of the most frequently raised questions about the link between women's autonomy and reproductive behaviour. The results from the multivariate logistic models show that although the relationship between women's autonomy and reproductive preferences in Eritrea is complex, some clear, broad patterns exist that have implications for theory and policy. First, although the different dimensions of women's autonomy influence the outcome variables differently in terms of magnitude and statistical significance, most of them have a strong connection; in particular, women's final say in decisions regarding day-to-day household purchases and spousal communication are significant explanatory variables in fertility preferences and ever-use of modern contraception. Second, many background (proxy) variables, particularly household economic condition and employment, exert a strong and independent influence over fertility preferences and ever-use of contraception regardless of a woman's autonomy. In their relationship to reproductive behaviours, therefore, employment and economic status cannot be considered as proxies for women's autonomy in Eritrea. A complete explanation of the relationship between women's autonomy and reproductive preferences must recognize the effects of both the background and direct autonomy indicators. Interventions are needed to improve women's decision-making autonomy and strengthen their negotiating capacity on family planning if an increased desire to limit fertility is to be attained.  相似文献   

14.
In this article, I focus on unintended pregnancy as a means to interrogate the intersections of abortion and prenatal discourses in the United States, and the ways in which these discourses assume certain kinds of moral, liberal subjects. Using media material, congressional legislation, public health policy, and ethnographic data from South Florida (2004-06), I trace how these discourses assume that women will behave in "rational," "responsible" ways to plan their reproductive futures, and how these assumptions intersect with Haitian women migrants' lived experiences in South Florida. My research illustrates how decisions about family planning are situated within particular local moral worlds, where gender relations, religion, power, and desires for children inform women's everyday lives.  相似文献   

15.
The last two decades have witnessed dramatic increases in obesity and family instability. To the extent that the social stigma of obesity is a risk factor and family instability represents the potential compromise of important protective factors, their convergence may disrupt socioemotional health, especially during periods of heightened social uncertainty. Drawing on data from the National Longitudinal Study of Adolescent Health, this study found that obese youth at the start of high school had higher levels of internalizing symptoms and lower levels of perceived social integration in school only when they had also experienced multiple family transitions since birth. This pattern, however, did not hold for boys, and it did not extend to overweight (as opposed to obese) adolescents of either gender.  相似文献   

16.
Expanded universal carrier screening (EUCS) entails a population‐wide screening offer for multiple disease‐causing mutations simultaneously. Although there is much debate about the conditions under which EUCS can responsibly be introduced, there seems to be little discussion about its aim: providing carrier couples with options for autonomous reproductive choice. While this links in with current accounts of the aim of foetal anomaly screening, it is different from how the aim of ancestry‐based carrier screening has traditionally been understood: reducing the disease burden in the population. The reasons why the aim of EUCS is presented in terms of ‘autonomy’ rather than ‘prevention’ have not been spelled out in the literature. This paper seeks to fill this gap by considering the morally relevant similarities and dissimilarities between foetal anomaly screening, ancestry‐based carrier screening and EUCS. When carrier screening is performed in the prenatal period, enhancing autonomy appears the most appropriate aim of EUCS, as the alternative of ‘prevention through selective abortion’ would urge women to terminate wanted pregnancies. However, when screening is conducted in the preconception period, carrier couples can avoid the birth of affected children by other means than selective abortion, for instance preimplantation genetic diagnosis. To the extent that this increased control over passing on a genetic disorder raises questions of parental responsibility, it seems necessary that the account of the aims of EUCS is wider than only in terms of enhancing reproductive autonomy.  相似文献   

17.
Conclusions In spite of these efforts in the 1920s and 1930s to initiate ongoing research on contraception, the subject of birth control remained a problem of concern primarily to the social activist rather than to the research scientist or practicing physician.80 In the 1930s, as has been shown, American scientists turned to the study of other aspects of reproductive physiology, while American physicians, anxious to eliminate the moral and medical dangers of contraception, only reluctantly accepted birth control as falling within their professional domain.As a result, the problem of cheap, effective, and safe contraception was not solved by these earliest attempts. Consideration of the subject was initiated afresh by private philanthropy after World War II, sparked by a new wave of interest in population studies.81 Summarizing such efforts to support research in the reproductive sciences, a recent Ford Foundation study has noted: To initiate and sustain serious research in the reproductive sciences has required for more than half a century concerted effort by interested individuals and private organizations, mainly from outside the mainstreams of the biomedical research community.82 The early laboratory research on chemical contraception described in this paper was but one important outcome of the concerted effort made by reformers in the 1920s to eliminate a variety of social problems thought to derive from excessive fertility. Scientific arguments and expertise were employed to advocate reform as well as to define the appropriate solution to such social problems. Scientists were recruited as advocates for the movement, but they were also employed as researchers in laboratory investigations sponsored by these same reformers.Sponsors of these early laboratory studies noted the difficulty of obtaining first-class investigators.83 The routine analyses necessary for such research, as well as the traditional scientific aversion to applied problems, provide only a partial explanation for this response. The real difficulty lay in recruiting investigators to a field (reproduction and human sexuality) that had previously been taboo. Once opened up — first as socially relevant, and finally as scientifically sound — there was much interest in this area, and the appeal to researchers of the scientific issues surrounding fertility and reproduction soon surpassed that of the reforming value of birth control.A survey of the kinds of experimental investigations sponsored by birth control advocates indicates the range of physiological problems explored by contraceptive research. The most definitive work was done on the efficacy and safety of spermicides, but the potential of other contraceptive methods was also examined. Investigators attempted to develop spermatoxins that would effectively immunize women against sperm, and they also tried to elucidate the mechanism of hormonal control of reproduction. In fact, speculations about the possible hormonal manipulation of fertility were expressed at the Seventh International Birth Control Conference held in Zurich in 1930.84 In the 1920s, clinical studies were undertaken to assess the effectiveness of the various birth control methods. Laboratory investigators complemented this work by screening spermicides for safety and testing for their ability to kill sperm. There were a variety of birth control preparations on the market (most of which were sold as feminine hygiene products), but no one really knew whether these were effective or even safe.85 Although the physiology of other major organ systems was well advanced, the scientific study of reproductive physiology and contraceptive technology was clearly in its infancy in this period. Routine analyses simply could not be conducted, because the fundamental research establishing baselines had not yet been done. Scientists used this fact to redirect attention to basic research on reproduction.Laboratory research on contraception indicated important unexplored areas for physiological investigation. Social activists, who had encouraged prominent scientists to become interested in both the social value and the genetic implications of birth control, found these investigators revising the goals of their research. The biologists had formed their own network and had begun to seek out funding, reformulating the justification for sponsorship of further investigations. The eugenic motivations underlying these studies, which had initially made them theoretically attractive to biologists, were gradually eroded. Concern with human evolution ceded its place to interest in physiological mechanisms. Crew and others began to note that the use of biological theory to justify essentially political decisions had serious limitations. Biologists had become uncomfortable with those very arguments which had originally captured their interest. Recognition of the potential political abuse wrought by applying scientific principles to society was expressed by Crew just one year after the Zurich meeting. Referring to previous assessments of the role of sex in reproduction, he generalized: In the past the biologist has justified feudalism, Manchester Liberalism, socialism and every other type of social organization and political programme by reference to selected biological phenomena.86 By 1932 Crew had also begun to question the biological logic of regulated breeding, and had made it clear to his American sponsor that there was no simple correspondence between the practice of birth control and the genetic improvement of the human race.87 Biologists further began to recognize, however, that although the hopeful genetic solution to human problems was probably an illusion, contraception still remained one tangible means to alleviate, human misery. Some laboratory scientists, like Crew, acknowledged the applicability of their own particular skills to this problem. For a few brief years, social needs and scientific goals were mutually supportive and closely intertwined. But as laboratory researchers gained interest in the study of reproduction and established their own priorities in this field, they temporarily withdrew from the arena of debate over birth control as an important mechanism for social reform.With the rise of Hitler, the genetic arguments for birth control rapidly lost their appeal. But by that time the scientific problem of how to achieve effective contraception had entered the professional consciousness. Both physicians and scientists began to be aware of birth control as a subject within their domain of expertise, although outside the principal focus of their research. Scientific discussion of birth control permanently altered from a question of justification to a problem of method: How could one achieve reliable and safe contraception? This had been Sanger's and Dickinson's goal from the beginning. Laboratory scientists had indeed been persuaded to undertake this work; this research had in turn affected biologists' perceptions of the whole field of reproductive physiology, encouraging further study of reproductive mechanisms. The promise of new knowledge provided for continued funding of this research, despite the caution by scientists that the social benefits would not be as immediate or as far-reaching as advocates and they themselves had first argued.The activities of birth control activists and their supporting agencies, and the financial backing of private contributors and foundations, notably the Rockefeller philanthropies, provided an important new stimulus to the development of research on the biology of reproduction in the late 1920s and early 1930s. Biologists were able to claim an enlarged realm of issues for scientific study through their activities as advocates and as investigators for the birth control movement. At the same time, they promised as-yet-undiscovered possibilities for regulating human reproduction once its physiology was understood. The knowledge and control that they promised lay in understanding the whole reproductive cycle — not merely in evaluating the toxic effects of presumptive spermicides.Chemical spermicides never summoned the interest of scientists as the contraceptive pill was to do, yet that research did reinforce the widespread perceptions of scientific research as essential to social reform. Spermicide investigations focused research efforts in reproductive biology by challenging traditional taboos, defining problems for further study, and providing laboratory investigators the opportunity to assert the social and scientific value of their own skills. Crew echoed this attitude as he observed in 1934:Man has turned from the adventurous conquest of his environment to the conquest of himself. To-day is the day of biological invention, eagerly used for the control of the undesirable and the unwanted. Sex and reproduction are no longer hedged around by myth and taboo; they are no longer accepted as mysteries that defy understanding. They are matters inviting examination and explanation; they are regarded as expressions of physico-chemical forces, the nature of which is to be displayed. It is accepted that when knowledge is sufficient, control will be absolute, and, though knowledge is not yet sufficient, readers ... must be persuaded to the view that this will not always be so.88 The synergism between reproductive biology and social needs has been temporary and sporadic, but recurring, since the 1920s. Scientific research programs have clearly been influenced by issues raised by public debate. Nevertheless, reproductive biologists have continued to assert their own professional goals. For the most part, they have rejected problems without inherent scientific interest and have spurned applied research except as it has had a direct bearing on current research themes. This attitude, apparent among American and British investigators in the 1930s, created the intellectual context for the invention and acceptance of the technically sophisticated oral contraceptive pill. It did not foster the production and improvement of the simple, safe, effective, and cheap vaginal contraceptive desired by early birth control advocates.  相似文献   

18.
Gross ML 《Bioethics》2002,16(3):202-230
Abortion, particularly later-term abortion, and neonaticide, selective non-treatment of newborns, are feasible management strategies for fetuses or newborns diagnosed with severe abnormalities. However, policy varies considerably among developed nations. This article examines abortion and neonatal policy in four nations: Israel, the US, the UK and Denmark. In Israel, late-term abortion is permitted while non-treatment of newborns is prohibited. In the US, on the other hand, later-term abortion is severely restricted, while treatment to newborns may be withdrawn. Policy in the UK and Denmark bridges some of these gaps with liberal abortion and neonatal policy. Disparate policy within and between nations creates practical and ethical difficulties. Practice diverges from policy as many practitioners find it difficult to adhere to official policy. Ethically, it is difficult to entirely justify perinatal policy in these nations. In each nation, there are elements of ethically sound policy, while other aspects cannot be defended. Ethical policy hinges on two underlying normative issues: the question of fetal/newborn status and the morality of killing and letting die. While each issue has been the subject of extensive debate, there are firm ethical norms that should serve as the basis for coherent and consistent perinatal policy. These include 1) a grant of full moral and legal status to the newborn but only partial moral and legal status to the late-term fetus 2) a general prohibition against feticide unless to save the life of the mother or prevent the birth of a fetus facing certain death or severe pain or suffering and 3) a general endorsement of neonaticide subject to a parent's assessment of the newborn's interest broadly defined to consider physical harm as well as social, psychological and or financial harm to related third parties. Policies in each of the nations surveyed diverging from these norms should be the subject of public discourse and, where possible, legislative reform.  相似文献   

19.
A cultural and relational framework of social class is used to present an ethnographic portrait of class as it unfolds with race and gender in a black high school and community. Traditionally viewed as troubling, these students (and staff) play between classes in ways that impact structural analyses of class and their implications for public policy.  相似文献   

20.
The degree to which animals use public and private sources of information has important implications for research in both evolutionary ecology and cultural evolution. While researchers are increasingly interested in the factors that lead individuals to vary in the manner in which they use different sources of information, to date little is known about how an animal''s reproductive state might affect its reliance on social learning. Here, we provide experimental evidence that in foraging ninespine sticklebacks (Pungitius pungitius), gravid females increase their reliance on public information generated by feeding demonstrators in choosing the richer of two prey patches than non-reproductive fish, while, in contrast, reproductive males stop using public information. Subsequent experiments revealed reproductive males to be more efficient asocial foragers, less risk-averse and generally less social than both reproductive females and non-reproductives. These findings are suggestive of adaptive switches in reliance on social and asocial sources of information with reproductive condition, and we discuss the differing costs of reproduction and the proximate mechanisms that may underlie these differences in information use. Our findings have important implications for our understanding of adaptive foraging strategies in animals and for understanding the way information diffuses through populations.  相似文献   

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