In lieu of an abstract, here is a brief excerpt of the content:Kennedy Institute of Ethics Journal 14.1 (2004) 47-54 [Access article in PDF] Ethical Guidelines for Human Embryonic Stem Cell Research*(A Recommended Manuscript) Adopted on 16 October 2001Revised on 20 August 2002 Ethics Committee of the Chinese National Human Genome Center at Shanghai, Shanghai 201203 Human embryonic stem cell (ES) research is a great project in the frontier of biomedical science for the twenty-first century. Be- cause (...) the research involves the use of human embryos, it triggers serious debate on ethical issues. Opponents consider the embryo to be an early form of human life that should be respected and not destroyed. However, the majority of scientists support embryonic stem cell research, believing that it offers good prospects for the treatment of diseases that have remained incurable until now and so will benefit humankind. The Ethics Committee of the Department of Ethical, Legal, and Social Implications of the Chinese National Human Genome Center at Shanghai seriously discussed the ethical debate initiated by embryonic stem cell research. We concluded that we should support the scientists of our country in actively carrying out human embryonic stem cell research for the noble cause of "medicine being a beneficent art." For the healthy and orderly development of human embryonic stem cell research in our country, we put forward the following recommended Ethical Guidelines for Human Embryonic Stem Cell Research as a reference for leaders, administrative departments, and related scientists. Preface Article 1. Human embryonic stem cells are the primitive cells that play the main role in the growth and development of a human body. These [End Page 47] primitive cells have the potential for infinite proliferation, self-renewal, and multi-directional differentiation. If scientists can discover the mechanism of differentiation of human embryonic stem cells, it will be possible to induce differentiation of human embryonic stem cells to form various types of human cells for clinical cell therapy. If human embryonic stem cell research can be integrated with modern biomedical engineering techniques, it also will be possible to make repair and replacement of human tissues and organs a reality. Article 2. There are two ways to classify human embryonic stem cells. One way is to classify them according to their potential for differentiation. There could be three kinds of stem cells: totipotent stem cells, pluripotent stem cells, and unipotent stem cells.A totipotent stem cell has the potential to develop into a whole individual. It can differentiate into the more than 200 cell types in the whole body, construct any tissue or organ of the body, and finally develop into a whole individual. The fertilized egg and the cleavage cells at the very early stage of embryonic development are totipotent stem cells.A pluripotent stem cell has the potential to differentiate into many cell types derived from the three embryonic layers. However, it has lost the capacity to develop into a complete organism.A unipotent stem cell is derived from the further differentiation of the pluripotent stem cell. It can differentiate only into one cell type such as a hematopoietic stem cell, neural stem cell, and others.The other way is to classify human stem cells according to their source. There could be two kinds of human stem cells: embryonic stem cells and tissue stem cells (also called adult stem cells). The former involves experimentation with embryos, which has serious ethical implications. Ethical issues associated with the latter are mainly expressed in the various opinions regarding the allocation of health resources. Article 3. Human embryonic stem cells are the group of cells called the blastocyst inner cell mass during the early stage of embryonic development. They are the main source of totipotent stem cells, and hence the focal and hot point in stem cell research. Studies on the clinical application of embryonic stem cells probably will involve use of the somatic cell nucleus transfer (SCNT) technique, which destroys the early human embryo. At present, the ethical and moral debate is very serious in human embryonic stem cell research regarding whether the research will develop... (shrink)

Eugene Mills has recently argued that human organisms cannot begin to exist at fertilization because the evidence suggests that egg cells persist through fertilization and simply turn into zygotes. He offers two main arguments for this conclusion: that ‘fertilized egg’ commits no conceptual fallacy, and that on the face of it, it looks as though egg cells survive fertilization when the process is watched through a microscope. We refute these arguments and offer several reasons of our own to think (...) that egg cells do not survive fertilization, appealing to various forms of essentialism regarding persons, fission cases, and a detailed discussion of the biological facts relevant to fertilization and genetics. We conclude that it is plausible, therefore, that human organisms begin to exist at fertilization – or, at the very least, that there are grounds for thinking that they existed as zygotes which do not apply to the prior egg cells. While this does not entail that human persons begin to exist at this point, it nevertheless has considerable significance for this latter question. (shrink)

In discussing the effects of grandparents on child survival in natural fertility populations, Coall & Hertwig (C&H) rely extensively on the review by Sear and Mace (2008). We conducted a more detailed summary of the same literature and found that the evidence in favor of beneficial associations between grandparenting and child survival is generally weak or absent. The present state of the data on human alloparenting supports a more restricted use of the term Human stem family situations with (...) celibate helpers-at-the-nest can be described as cooperatively breeding, but the term is a poor fit to many human family systems. (shrink)

Several philosophers have recently argued that policies aimed at reducing human fertility are a practical and morally justifiable way to mitigate the risk of dangerous climate change. There is a powerful objection to such “population engineering” proposals: even if drastic fertility reductions are needed to prevent dangerous climate change, implementing those reductions would wreak havoc on the global economy, which would seriously undermine international antipoverty efforts. In this article, we articulate this economic objection to population engineering and show how (...) it fails. We argue, first, that the economic objection paints an inaccurate picture of the complicated relationship between demographic change and economic growth, and second, that any untoward economic effects of fertility reduction can be mitigated with additional policies. Specifically, we argue that supplementing fertility reduction with policies that facilitate the emigration of younger people from developing nations to developed nations could allow for both global reductions in GHG emissions and continued economic stability. Further, we show that moral arguments against such unprecedented increases in immigration are unsuccessful. We conclude that population engineering is a practical and morally justifiable tool for addressing the twin evils of climate change and global poverty. (shrink)

When fertility centers dispose of embryos, how should this be done? Current regulatory guidelines by the Human Fertilisation and Embryology Authority state that, when terminating the development of human embryos, a clinic should act with sensitivity, taking account of the embryo’s “special status” and respecting the interests of the gamete providers and recipients. As yet, it is unclear as to how and to what extent this achieved within fertility clinics in the UK. Resultantly, this paper examines the largely (...) undocumented domain of embryo disposal practice. By undertaking an empirical study into policy and procedure and noting divergence in clinic practice, it then comments on the ethical implications of these protocols for patients and practitioners. Specifically, this paper argues for a more holistic approach to embryo disposal. An approach that effectively meets the requirements of the lab, is respectful of the “special status” of the human embryo, and, perhaps most importantly, reflects the multifaceted needs of the patient. (shrink)

Freezing Fertility: Oocyte Cryopreservation and the Gender Politics of Aging is the fourth path-breaking monography in the flourishing literature on egg freezing in just a few years. In April 2019, The Oocyte Economy: The Changing Meaning of Human Eggs by the renowned Australian social scientist Catherine Waldby, was published, the first book to examine the emergence of a global market for eggs through biomedical innovation. In September 2019, sociologist Kylie Baldwin of De Montfort University published Egg Freezing, Fertility and (...) Reproductive Choice: Negotiating Responsibility, Hope and Modern Motherhood, in which she explores the experiences of some pioneering women who are having eggs frozen in the United... (shrink)

Two methods of dietary recording, the 24-hr recall and the weighed dietary intake methods, are considered appropriate for estimating energy and nutrient intakes in studies of human fertility. The former method gives lower estimates than the latter, although weighed intakes may underestimate true intakes. Examination of food intakes of pregnant, lactating, and non-pregnant, non-lactating New Guinean women shows their diet to be less homogeneous than is generally assumed for groups in developing countries. As a result direct observations of food (...) intake for a limited number of days are not sufficiently accurate for the estimation of intake of most of the nutrients examined. Rather the study design should reflect the variability of intakes of the nutrients and groups under consideration. (shrink)

Recommandations have been formulated in 1985 with reference to socialist morality and law and as a result of interdisciplinary discussion by the IAME (Interdisciplinary Working Party on Medical Ethics at the GDR Academy of Postgraduate Medical Education) for clinical application of in vitro fertilization and for the use of human oocytes and early embryonic stages.

Our objective is to test an optimality model of human fertility that specifies the behavioral requirements for fitness maximization in order (a) to determine whether current behavior does maximize fitness and, if not, (b) to use the specific nature of the behavioral deviations from fitness maximization towards the development of models of evolved proximate mechanisms that may have maximized fitness in the past but lead to deviations under present conditions. To test the model we use data from a representative (...) sample of 7,107 men living in Albuquerque, New Mexico, between 1990 and 1993. The model we test proposes that low fertility in modern settings maximizes number of grandchildren as a result of a trade-off between parental fertility and next generation fertility. Results do not show the optimization, although the data do reveal a trade-off between parental fertility and offspring education and income.We propose that two characteristics of modern economies have led to a period of sustained fertility reduction and to a corresponding lack of association between income and fertility. The first is the direct link between costs of investment and wage rates due to the forces of supply and demand for labor in competitive economies. The second is the increasing emphasis on cumulative knowledge, skills, and technologies in the production of resources. Together they produce historically novel conditions. These two features of modern economies may interact with evolved psychological and physiological mechanisms governing fertility and parental investment to produce behavior that maximizes the economic productivity of lineages at the expense of fitness. If cognitive processes evolved to track diminishing returns to parental investment and if physiological processes evolved to regulate fertility in response to nutritional state and patterns of breast feeding, we might expect non-adaptive responses when returns from parental investment do not diminish until extremely high levels are reached. With high economic payoffs from parental investment, people have begun to exercise cognitive regulation of fertility through contraception and family planning practices. Those cognitive processes maynot have evolved to handle fitness trade-offs between fertility and parental investment. (shrink)

Over the last two decades, social scientists across disciplines have been researching how value is extracted and governed in the reproductive bioeconomy, which broadly refers to the various ways reproductive tissues, bodies, services, customers, workers, and data are inserted into capitalist modes of accumulation. While many of these studies are empirically grounded in single country–based analyses, this paper proposes an integrative political economy framework, structured around the concept of “global fertility chains.” The latter articulates the reproductive bioeconomy as a nexus (...) of intraconnected practices, operations, and transactions between enterprises, states, and households across the globe, through which reproductive services and commodities are produced, distributed, and consumed. Employing a diffractive reading of the literature on commodity chains and care chains, this unified approach scrutinizes the coproduction of value, biology, and technoscience and their governance mechanisms in the accumulation of capital by taking into account the unevenly developed geographies of global fertility chains, their reliance on women’s waged and unwaged reproductive labor, and the networked role of multiple actors at multiple scales without losing sight of the constitutive role of national states in creating demand, organizing supply, and accommodating the distribution of surplus value. We empirically ground this integrative political economy approach of the reproductive bioeconomy through collaborative, multisited fieldwork on transnational reproduction networks in Israel/palestine, Romania, Georgia, and Spain. (shrink)

Reality TV is immensely popular, and various shows in this media genre involve a storyline of infertility and infertility treatment. Feminists argue that normative and constructed realities about infertility and infertility treatment, like those in reality TV, are central to the emancipation of women. Such realities are able to steer viewers' perceptions of the world. This article examines the emancipatory significance of representations of women on 'infertility reality TV shows'. While the women in these shows all have 'abnormal' qualities, we (...) consider their portrayal as figurations of monstrosity. In the literature, monstrosity is understood as a way to challenge nonemancipatory norms by offering an alternative identity. Through a content analysis of seven reality TV shows, we identified four types of in/fertile monsters: the cyborg, the freak, the abject, and the childless. We show that these monsters are predominantly non-emancipatory as they all involve mechanisms of altering, excluding, or condemning infertility in relation to what is considered normal and acceptable womanhood. Therefore, at the end of this article, we make a plea for more diverse and emancipatory representations of infertile women in popular culture. (shrink)

Fulfilling the "unmet need for contraceptives" in Latin America is still a contested rallying cry for local activists, policymakers, and physicians. It evokes both the consumerist aspiration to choose birth control methods, as well as implies the existence of health and welfare institutions that ought to guarantee a human right. In the 1940s, however, the "unmet need for contraceptives" was a fledgling notion that a group of experts had only begun to popularize through the use of a crucial population-making (...) technology: the fertility survey. This paper analyzes the role fertility surveyors played in the mid-twentieth century, framing Latin American populations as rapidly growing and likely... (shrink)

An ethical issue that has largely been overlooked and neglected is the potential conflict of interests faced by medical professionals in the recruitment, counselling and reimbursement of egg donors. It must be noted that fertility treatment in private practice is an overwhelmingly profit-driven enterprise. To attract more patients and generate more income, there is a strong incentive for fertility clinics and doctors to actively and aggressively recruit women for their egg donation programme. In some countries where substantial financial remuneration for (...) egg donation is permitted—for example, the United States,1 2 fertility doctors and clinical embryologists often act as the “middleman” or broker to facilitate the transaction of eggs between donor and recipient. Very often, the usual practice is for fertility clinics to charge patients a commission for sourcing egg donors, which is an additional profit on top of substantial medical fees that would be earned from provision of fertility treatment to the same patient. This is ethically contentious; because the money earned is not directly related to medical services rendered to the patient, but is instead attributed to the brokerage and transaction of donated human material.There is a risk that the welfare of the …. (shrink)

Globally, mortality and fertility rates generally fall as resource abundance increases. This pattern represents an evolutionary paradox insofar as resource-rich ecological contexts can support higher numbers of offspring, a component of biological fitness. This paradox has not been resolved, in part because the relationships between fertility, life history strategies, reproductive behavior, and socioeconomic conditions are complex and cultural-historically contingent. We aim to understand how we might make sense of this paradox in the specific context of late-twentieth-century, mid–demographic transition Chile. We (...) use distribution-specific generalized linear models to analyze associations between fertility-related life-history traits—number of offspring, ages at first and last reproduction, average interbirth interval, and average number of live births per reproductive span year—and socioeconomic position (SEP) using data from a cohort of 6,802 Chilean women born between 1961 and 1970. We show that Chilean women of higher SEP have shorter average interbirth intervals, more births per reproductive span year, later age at first reproduction, earlier ages at last reproduction, and, ultimately, fewer children than women of lower SEP. Chilean women of higher SEP consolidate childbearing over a relatively short time span in the middle of their reproductive careers, whereas women of lower SEP tend to reproduce over the entirety of their reproductive lifespans. These patterns may indicate that different SEP groups follow different pathways toward declining fertility during the demographic transition, reflecting different life-history trade-offs in the process. (shrink)

Human population growth must end, and the sooner the better, for both nature and a humanity that pursues boundlessly increasing affluence. Poisoning of organisms and massive extinctions result, exacerbated by population momentum. Infliction of pain and death largely for trivial reasons constitutes the ignoble dénouement of our history. Reducing human numbers would be only one fitting response to recognition of this situation. Reliance on voluntary socio-economic reforms, including even the empowennent of women, appears unlikely to lead to below-replacement-level (...) fertility, since families on average still elect to have more than two children. Discussed are three reasons for thinking that coercive measures could help to engender a decreasing human population without negating preferable voluntary efforts to the same end. Hence some coercion to reduce fertility is justifiable. (shrink)

In some areas of clinical medicine, discussions about fertility preservation are routine, such as in the treatment of children and adolescents facing cancer treatments that will destroy their ability to produce gametes of their own. Certain professional organizations now offer guidelines for people who wish to modify their bodies and appearance in regard to sex traits, and these guidelines extend to recommendations about fertility preservation. Since the removal of testicles or ovaries will destroy the ability to have genetically related children (...) later on, it is imperative to counsel transgender people seeking body modifications about fertility preservation options. Fertility preservation with transgender people will, however, lead to unconventional outcomes. If transgender men and women use their ova and sperm, respectively, to have children, they will function as a mother or father in a gametic sense but will function in socially reversed parental identities. There is nothing, however, about fertility preservation with transgender men and women that is objectionable in its motives, practices, or outcomes that would justify closing off these options. In any case, novel reproductive technologies may extend this kind of role reversal in principle to all people, if sperm and ova can be derived from all human beings regardless of sex, as has happened with certain laboratory animals. (shrink)

Sustaining soil fertility is essential to the prosperity of many households in the mid-hills of Nepal, but there are concerns that the breakdown of the traditional linkages between forest, livestock, and cropping systems is adversely affecting fertility. This study used triangulated data from surveys of households, discussion groups, and key informants in 16 wards in eastern and western Nepal to determine the existing practices for soil fertility management, the extent of such practices, and the perception of the direction of changes (...) in soil fertility. The two principal practices for maintaining soil fertility were the application of farmyard manure (FYM) and of chemical fertilizer (mainly urea and diammonium phosphate). Green manuring, in-situ manuring, slicing terrace risers, and burning plant residues are rarely practiced. FYM usage was variable with more generally applied to khet land (average 6053 kg fresh weight manure ha−1) than to bari land (average 4185 kg fresh weight manure ha−1) with manure from goats and poultry preferred above that from cows and buffaloes. Almost all households (98%) apply urea to khet land and 87% to bari land, with 45% applying diammonium phosphate to both types of land. Application rates and timings of applications varied considerably both within and between wards suggesting poor knowledge transfer between the research and farming communities. The benefits of chemical fertilizers in terms of ease of application and transportation in comparison with FYM, were perceived to outweigh the widely reported detrimental hardening of soil associated with their continued usage. Among key informants, FYM applied in conjunction with chemical fertilizer was the most popular amendment, with FYM alone preferred more than chemical fertilizer alone – probably because of the latter’s long-term detrimental effects. Key informant and householder surveys differed in their perception of fertility changes in the last decade probably because of differences in age and site-specific knowledge. All key informants felt that fertility had declined but among households, only about 40% perceived a decline with the remainder about evenly divided between no change and an increase. Householders with small landholdings (< 0.5 ha) were more likely to perceive increasing soil fertility while those with larger landholdings (> 2 ha) were more likely to perceive declining fertility. Perceived changes in soil fertility were not related to food self-sufficiency. The reasons for the slow spread of new technologies within wards and the poor understanding of optimal use of chemical fertilizers in conjunction with improved quality FYM may repay further investigation in terms of sustaining soil fertility in this region. (shrink)

Male provisioning ability may have evolved as a “good dad” indicator through sexual selection, whereas male creativity may have evolved partly as a “good genes” indicator. If so, women near peak fertility (midcycle) should prefer creativity over wealth, especially in short-term mating. Forty-one normally cycling women read vignettes describing creative but poor men vs. uncreative but rich men. Women’s estimated fertility predicted their short-term (but not long-term) preference for creativity over wealth, in both their desirability ratings of individual men (r=.40, (...) p<.01) and their forced-choice decisions between men (r=.46, p<.01). These preliminary results are consistent with the view that creativity evolved at least partly as a good genes indicator through mate choice. (shrink)

During the last 100 years, several interpretations of the Thesmophoria have been advanced. Following the typology of H.S. Versnel, we can classify these interpretations as substantive, functionalist and cosmological. The three approaches can be seen as comple­mentary, but in practice they are hardly ever pursued simultaneously. This article examines how they fit together. In particular, it re-examines the subject of fertility, asking how it fits in with the wider social and ideological issues to which Detienne and others have drawn attention (...) and which, to our mind, have little connection with agriculture or human repro­duction. As a response this paper offers a synthetic interpretation that places fertility in a wider cosmological context and shows it as interconnected with all the other levels of the festival.Plusieurs interprétations des Thesmophories ont été proposées depuis un siècle. En suivant la typologie d’H.S. Versnel, on peut les qualifier de substantives, de fonctionnalistes et de cosmologiques. Les trois approches peuvent être complémentaires, mais, en pratique, elles sont difficilement assumées en même temps. L’article examine la manière dont elles fonctionnent ensemble. Il reprend en particulier le thème de la fertilité, en posant la question de savoir comment il s’insère dans les thèmes sociologiques et idéologiques plus larges sur lesquels Detienne et d’autres ont attiré l’attention et qui, dans notre esprit, ont peu de rapport avec l’agriculture et la reproduction humaine. En réponse à ce problème, on offre une interprétation synthétique qui situe la fertilité dans un contexte cosmologique plus vaste et en montre les relations avec les autres niveaux de la fête. (shrink)

This book takes couples down the obstacle-strewn path toward fertility, discussing all factors that encompass difficulty conceiving.

The question of the morality ofin vitro fertilization is examined. One of the central questions to be answered is whether the zygote loss that seems inseparable from the process is morally justified. Even when embryo transfer occurs, many zygotes which have been intentionally created are intentionally destroyed; they are used as means to the alleged benefits that others will attain.

In the modern world, technology has enabled us to understand the connections between the menstrual cycle and female fertility and to observe the reproductive process even from conception. Unable to see inside the living body, however, eighteenth-century people imagined reproduction and fertility holistically. Their understanding of fertility was inseparable from the way in which they imagined the inner-workings of the humoral body. Although menstruation was understood to be connected to reproduction, it was considered unreliable, a peripheral indicator of fertility. Above (...) all, the best marker of a woman’s fecundity was good overall health. (shrink)

Many geoengineering projects have been proposed to address climate change, including both solar radiation management and carbon removal techniques. Some of these methods would introduce additional compounds into the atmosphere or the ocean. This poses a difficult conundrum: Is it permissible to remediate one pollutant by introducing a second pollutant into a system that has already been damaged, threatened, or altered? We frame this conundrum as the ‘‘Problem of Permissible Pollution.’’ In this paper, we explore this problem by taking up (...) ocean fertilization and advancing an argument that rests on three moral claims. We first observe that pollution is, in many respects, a context-dependent matter. This observation leads us to argue for a ‘‘justifiability criterion.’’ Second, we suggest that remediating actions must take into account the antecedent conditions that have given rise to their consideration. We call this second observation the ‘‘antecedent conditions criterion.’’ Finally, we observe that ocean fertilization, and other related geoengineering technologies, propose not strictly to clean up carbon emissions, but actually to move the universe to some future, unknown state. Given the introduced criteria, we impose a ‘‘future-state constraint’’. We conclude that ocean fertilization is not an acceptable solution for mitigating climate change. In attempting to shift the universe to a future state geoengineering sidelines consideration of the antecedent conditions that have given rise to it —conditions, we note, that in many cases involve unjustified carbon emissions —and it must appeal to an impossibly large set of affected parties. (shrink)

A sociologist examines contemporary engagements of queer bodies and identities with fertility biomedicine. Drawing on social science, media culture, and the author’s own empirical research, three questions frame the analysis: 1. In what ways have queers on the gendered margins moved into the center and become implicated or central users of biomedicine’s fertility offerings? 2. In what ways is Fertility Inc. transformed by its own incorporation of various gendered and queered bodies and identities? And 3. What are the biosocial and (...) bioethical implications of expanded queer engagements and possibilities with Fertility Inc.? The author argues that “patient” activism through web 2.0 coupled with a largely unregulated free-market of assisted reproduction has included various queer identities as “parents-in-waiting.” Such inclusions raise a set of ethical tensions regarding how to be accountable to the many people implicated in this supply and demand industry. (shrink)

The use of preimplantation genetic diagnosis (PGD) has expanded both in number and scope over the past 2 decades. Initially carried out to avoid the birth of children with severe genetic disease, PGD is now used for a variety of medical and non-medical purposes. While some human studies have concluded that PGD is safe, animal studies and a recent human study suggest that the embryo biopsy procedure may result in neurological problems for the offspring. Given that the long-term (...) safety of PGD has not been clearly established in humans, this study sought to determine how PGD safety is presented to prospective patients by means of a detailed website analysis. The websites of 262 US fertility centres performing PGD were analysed and comments about safety and risk were catalogued. Results of the analysis demonstrated that 78.2% of centre websites did not mention safety or risk of PGD at all. Of the 21.8% of centres that did contain safety or risk information about PGD, 28.1% included statements highlighting the potential risks, 38.6% presented information touting the procedure as safe and 33.3% included statements highlighting potential risks and the overall safety of the procedure. Thus, 86.6% of PGD-performing centres state that PGD is safe and/or fail to disclose any risks on their websites despite the fact that the impact of the procedure on the long-term health of offspring is unproven. This lack of disclosure suggests that informed consent is inadequate; this study examines numerous factors that are likely to inhibit comprehensive discussions of safety. (shrink)

Based on historical data pertaining to the Krummhörn population (eighteenth and nineteenth centuries, Germany), we compared reproductive histories of mothers according to whether the maternal grandmother (MGM) or the paternal grandmother (PGM) or neither of them was resident in the parents’ parish at the time of the mother’s first birth. In contrast to effects of PGMs, we discovered conditional differences in the MGM’s effects between landless people and wealthier, commercial farmers. Our data indicate that the presence of the MGM only (...) lowers the woman’s age at marriage (AAM) and her age at the birth of her first child (AFB) in the case of landless families. However, among commercial farmers, who can generally be characterized by a lower AAM and AFB, we found opposite tendencies for the MGM’s effect leading to a relatively small delay in AAM and AFB. Moreover, we also analyzed differences in the completed fertility (i.e., children ever born: CEB). Results indicate that landless families in general do have fewer CEB compared with commercial farmers except for those families in which the MGM has been present. Emphasizing that the adaptiveness of investment decisions should depend on the interaction of genetic, lineage-specific (intrinsic) and ecologically imposed (extrinsic) constraints, we conclude that kin strategies consequently address different fitness components under different conditions. (shrink)

Colonists, unlike indigenous peoples, are often assumed tohave little knowledge of their environment. However, their perceptions of the environment and their knowledgeof natural resource systems have a significant impact on their farming practices. Farmers in the frontier regionof Marabá, Eastern Amazonia, understand nutrient cycling and the links between different components in farmingsystems. Diagrams drawn by farmers show very diversified systems, and farmers' knowledge of soilcharacteristics, including sub-surface features, and distribution in their localities is very detailed in comparison to pedologicalclassifications. However, (...) knowledge about nutrient cycling is very uneven, even between farmers from the same area.Generally, farmers were found to have very detailed knowledge of environmental resources, but very patchyknowledge of processes and functions underlying systems, and this conforms to evolutionary models of ecologicalknowledge. Perceptions of change in soil fertility are related to the length of settlement, and are closelylinked to the presence of forest. Overall, the majority of farmers believe they will not be able to sustain cropping in thefuture, and as forest and fallow become scarce the most feasible option will be for them to move to other areas.Farmers are more optimistic about pasture, which is viewed as a more stable system, with the key to long-termsustainability being weed control. These findings imply that a high degree of information sharing between farmers andscientists is required to establish resource management strategies and social institutions to supportsustainable development strategies at the frontier. (shrink)

In the medical-technological practice of in vitro fertilization, it is increasingly the couple, rather than an individual patient, that is considered the unit of treatment. This article traces some mechanisms involved in the construction of medical interventions on female bodies as appropriate and effective therapeutic solutions to problems and diagnoses pertaining to male bodies. It traces the transformation of male infertility through shifts in localization and definition of the problem, concomitant reconceptualizations of the techniques involved, redistributions of properties, and specific (...) ways of constructing "success. " It is argued that both the notion of the couple as the patient in cases of male infertility and the claim that IVF techniques are appropriate solutions to this couple's problem simultaneously presuppose and legitimize medical interventions on women's bodies. This double movement is produced by leaving exactly the required material work of physical interventions—and, consequently, the uneven distribution of costs between the sexes—out of scientific accounts of these practices. (shrink)