In marine species, high dispersal is often associated with only mild genetic differentiation
over large spatial scales. Despite this generalization, there are numerous reasons for the …

The last decade has brought renewed interest in the genetics of speciation, yielding a
number of new models and empirical results. Defining speciation as 'the origin of …

The genomic causes and effects of divergent ecological selection during speciation are still
poorly understood. Here we report the discovery and detailed characterization of early-stage …

Are new species formed in rare catastrophes, distinct from the normal processes of phyletic
evolution? Or does reproductive isolation evolve gradually, as a by-product of the …

Sexual signals are often critical for mate attraction and reproduction, although their
conspicuousness exposes them to parasites and predators. We document the near …

The central paradox of schizophrenia is that the condition, apparently genetic in origin,
persists in spite of a substantial fecundity disadvantage. The hypothesis is proposed that the …

Asymmetric postmating isolation, where reciprocal interspecific crosses produce different
levels of fertilization success or hybrid sterility/inviability, is very common. Darwin …

Patterns of reproductive isolation between species may provide insight into the mechanisms
and evolution of barriers to interspecific gene exchange. We used data from published …

The role of sexual selection in speciation is investigated, addressing two main issues. First,
how do sexually selected traits become species recognition traits? Theory and empirical …

OBJECTIVE: To achieve a unified concept of the aetiology of psychosis. BACKGROUND:
The nuclear symptoms of “schizophrenia” occur with approximately the same age-and sex …