How Neutral is Ecology?

Neutral ecological theory comes in two flavors—a two-stage model with space implicit and a spatially explicit version. Reconciliation of the two flavors has proven problematic. Panmixis, an implicit assumption of the two-stage model, is neither realistic for nor supported by tropical forest trees. However, in spatially explicit versions, stochastic species input in local communities is still necessary to retain high species richness. A unified theory of biodiversity must include both stochasticity and relevant ecological mechanisms.     

Should living wills be legalized?

Living wills allow patients to state their wish to die and not be kept alive through the use of medications, artificial means or "heroic" measures. They have been made legal documents in 38 states in the United States. Living wills permit advance expression of a patient''s wishes, promote effective communication and demonstrate respect for the patient as a person. Problems with legal recognition of such wills include the need for agreement on fundamental terms, possible restriction of patients'' rights, limitation of options in decision-making and possible negative effects on the physician-patient relationship. Before legislation is enacted, public and professional attitudes toward the care of terminally ill patients should be assessed. All health care professionals should receive better education in this area, and palliative care services should be made more widely available. Only if these measures fail should living wills be made legal documents in Canada.     

Should taxon names be explicitly defined?

Overviews are provided for traditional and phylogenetic nomenclature. In traditional nomenclature, a name is provided with a type and a rank. In the rankless phylogenetic nomenclature, a taxon name is provided with an explicit phylogenetic definition, which attaches the name to a clade. Linnaeus’s approach to nomenclature is also reviewed, and it is shown that, although the current system of nomenclature does use some Linnaean conventions (e.g., certain rank-denoting terms, binary nomenclature), it is actually quite different from Linnaean nomenclature. The primary differences between traditional and phylogenetic nomenclature are reviewed. In phylogenetic nomenclature, names are provided with explicit phylogenetic definitions, whereas in traditional nomenclature names are not explicitly defined. In phylogenetic nomenclature, a name remains attached to a clade regardless of how future changes in phylogeny alter the clade’s content; in traditional nomenclature a name is not “married” to any particular clade. In traditional nomenclature, names must be assigned ranks (an admittedly arbitrary process), whereas in phylogenetic nomenclature there are no formal ranks. Therefore, in phylogenetic nomenclature, the name itself conveys no hierarchical information, and the name conveys nothing regarding set exclusivity. It is concluded that the current system is better able to handle new and unexpected changes in ideas about taxonomic relationships. This greater flexibility, coupled with the greater information content that the names themselves (i.e., when used outside the context of a given taxonomy or phytogeny) provide, makes the current system better designed for use by all users of taxon names.     

Should advertising parental care be honest?

Species with paternal care show less exaggerated sexual ornamentation than those in which males do not care, although direct benefits from paternal care can vastly exceed the indirect benefits of mate choice. Whether condition-dependent handicaps can signal parenting ability is controversial. The good-parent process predicts the evolution of honest signals of parental investment, whereas the differential-allocation model suggests a trade-off between the attractiveness of a mate and his care-provisioning. I show that both alternatives can arise from optimal allocations to advertisement, parental investment and future reproductive value of the male, and that the male''s marginal fitness gain from multiple matings determines which option should apply. The marginal gain is diminishing if opportunities for polygyny or extra-pair copulations are limited. Advertisement is then expected to be modest and honest, indicating genetic quality and condition-dependent parental investment simultaneously. Increasing marginal gains are likely to be related to cases where genetic quality has a significant influence on offspring fitness. This alternative leads to differential allocation with stronger advertisement, more frequent extra-pair copulations, and diminished male care. Reliability is also reduced if allocation benefits have thresholds, e.g. if there is a minimum body condition required for survival, or if females use a polygyny-threshold strategy of mate choice.     

Should all casualty radiographs be reviewed?

The effect on the management of patients of routine reporting of casualty radiographs by radiologists was reviewed. The overall prevalence of error by casualty doctors was 6.2%. Many of these errors, however, were trivial and did not alter treatment. In only 1.1% of the cases reviewed did the report of x ray films appreciably alter the management of the patient. A severity score was introduced to highlight those anatomical areas in which important lesions were overlooked most often. Radiologists'' reports on radiographs of the chest, face, skull, and wrist had the greatest effect on management of patients, while reports on radiographs of fingers, hands, shoulders, long bones, and toes seldom altered treatment.     

Should Gender Reassignment Surgery be Publicly Funded?

Transgender people have among the highest rates of suicide attempts of any group in society, driven strongly by the perception that they do not belong in the sex of their physical body. Gender reassignment surgery (GRS) is a procedure that can change the transgender person’s physical body to accord with their gender identity. The procedure raises important ethical and distributive justice concerns, given the controversy of whether it is a cosmetic or medical procedure and the economic costs associated with performing the procedure. This paper argues that there is a strong case for funding GRS as a matter of clinical necessity and justice. This paper will be divided in four key sections: First, the state of transgender health will be outlined, including the role of GRS and common objections to it. Second, a number of common objections to GRS will be analysed at the outset and shown to be unconvincing. Third, a constructive argument will be advanced, arguing that publicly funded GRS is clinically necessary, cost-effective, and demanded by principles of justice. Fourth, the paper will briefly discuss moralistic biases and why we demand a higher burden of justification for funding GRS compared with other analogous procedures.     

Should the draft chimpanzee sequence be finished?

Owing to the availability of genome working drafts (WDs), current comparative-sequence studies are frequently performed on a genome-wide scale. In this article, we appraise the utility of WD sequences in the detection of genomic differences in closely related species. We compared human DNA sequences with draft and high-quality versions of the corresponding chimpanzee loci to reveal the overall high quality of the chimp WD sequence. Nevertheless, a significant proportion of the differences between WD and high-quality sequences we observed can be attributed to sequencing errors in the draft. Although we suggest methods to reduce the number of such false positives efficiently, our study emphasizes the benefit expected from finishing the chimpanzee genome sequence.     

Should DDT be banned by international treaty?

The insecticide DDT has been an effective and affordable means of malaria control in many countries, but pressure for its use to be banned is mounting. Here, Chris Curtis and Jo Lines take a critical look at evidence that links house spraying by DDT with harm to the environment and human health, and stress the need for resources for alternatives to DDT to be made available to countries that would be affected by a DDT ban.