A holey adaptive landscape is an adaptive landscape where relatively infrequent well-fit
combinations of genes form a contiguous set that expands throughout the genotype space. I …

Phylogenetic relationships of populations and species within Potamorrhaphis, a genus of
freshwater South American needlefishes, were assessed using mitochondrial cytochrome b …

Background A central question in evolutionary biology is how cryptic species maintain
species cohesiveness in an area of sympatry. The coexistence of sympatrically living cryptic …

Reinforcement occurs when natural selection strengthens behavioral discrimination to
prevent costly interspecies matings, such as when matings produce sterile hybrids. This …

Anolis lizards in the Greater Antilles partition the structural microhabitats available at a given
site into four to six distinct categories. Most microhabitat specialists, or ecomorphs, have …

Two recently diverged northeastern Pacific sibling snail species, Nucella ostrina and N.
emarginata, currently inhabit adjacent zoogeographic provinces. Their distributions overlap …

Amplified fragment-length polymorphic (AFLP) loci were examined in the fall armyworm,
Spodoptera frugiperda (JE Smith), to assess their ability to distinguish 2 host-associated …

This paper summarizes the results of an initial effort to reconstruct the speciational history of
cave spiders (Nesticus) from the southern Appalachian Mountains of eastern North America …

Taxonomists, when describing a new species, often added the term bona species after the
Linnaean binomial. The implication is that there are also malae species. A “bad species” is a …

Continental shelf island systems, created by rising sea levels, provide a premier setting for
studying the effects of past fragmentation, dispersal, and genetic drift on taxon …