Underestimating intraspecific variation: The problem with excluding Sts 19 fromAustralopithecus africanus

Underestimating intraspecific variation: the problem with excluding Sts 19 from Australopithecus africanus.

Two analyses conclude that Sts 19 cannot be accommodated within the Australopithecus africanus hypodigm (Kimbel and Rak [1993] In Kimbel and Martin [eds.]: Species, Species Concepts, and Primate Evolution. New York: Plenum, pp. 461-484; Sarmiento [1993] Am. J. Phys. Anthropol. [Suppl.] 16:173). Both studies exclude Sts 19 because it possesses synapomorphies with Homo. Furthermore, according to ...

There Exist Nonisomorphic STS(19) with Equivalent Point Codes

Biodiversity and intraspecific genetic variation

Biodiversity is mostly discussed at the level of species, but genetic variation within species may be as important as variation between species. It enables organisms to adapt to environmental changes. The requirement for genetic variation differs however widely between species and groups of species. Animal species at the top of the food web, such as large carnivorous mammals, tend to have a rem...

Intraspecific variation and species coexistence.

We use a two-species model of plant competition to explore the effect of intraspecific variation on community dynamics. The competitive ability ("performance") of each individual is assigned by an independent random draw from a species-specific probability distribution. If the density of individuals competing for open space is high (e.g., because fecundity is high), species with high maximum (o...

Sleep-disordered breathing in children: are we underestimating the problem?

S leep-disordered breathing (SDB) is a spectrum of disorders, ranging from primary snoring to severe obstructive sleep apnoea syndrome (OSAS). Several studies have suggested that primary snoring may affect 10– 25% of children aged 3–12 yrs, and 10% of these children may have OSAS [1–3]. SDB is known to be associated with behavioural problems, such as aggression, hyperactivity, attention-deficit...