Learn More
SYNOPSIS. Interspecific comparisons have played a prominent role in evolutionary biology at least since the time of Charles Darwin. Since 1985, the "comparative method" has been revitalized by new analytical techniques that use phylogenetic information and by increased availability of phytogenies (often from molecular data sets). Because species descend(More)
We assessed the relative importance of environmental variation, interspecific competition for space, and predator abundance on assemblage structure and microhabitat use in a stream fish assemblage inhabiting Coweeta Creek, North Carolina, USA. Our study encompassed a lO-yr time span (1983-1992) and included some of the highest and lowest flows in the last(More)
(With 1 figure in the text) The present study investigates relationships among size, shape and speed in the Australian agamid lizard Amphibolurus nuchalis. Maximal running speed, body mass, snout-vent length, tail length, fore-and hind limb spans and thigh muscle mass were measured in 68 field-fresh individuals spanning the entire ontogenetic size range(More)
This paper addresses the problem of obtaining numerically maximum-likelihood estimates of the parameters for a mixture of normal distributions. In recent literature, a certain successive-approximations procedure, based on the likelihood equations, was shown empirically to be effective in numerically approximating such maximum-likelihood estimates; however,(More)
  • W Illiam, J Otrosina, +7 authors Jr Korhonen
  • 1999
and F intersterility groups were subjected to isozyme analysis. European S, P, and F groups had more variability than the North American S and P groups in expected hterozygosity, number of alleles per locus, and percent polymorphic loci. In contrast with the North American S and P groups, the European intersterility groups could not be distinguished from(More)
A t a workshop on the variability of the Asian– Australasian Monsoon in July 1998 in St. Michaels, Maryland, two major mechanisms were discussed at length, each thought to have the potential to produce monsoon variability. 1 The first mechanism, the role of external forcing (e.g., Charney and Shukla 1980), considered the influence on the monsoon of ENSO(More)
We define a four-state Potts model ensemble on the square lattice, with the constraints that neighboring spins must have different values, and that no plaquette may contain all four states. The spin configurations may be mapped into those of a 2-dimensional interface in a 2+5 dimensional space. If this interface is in a Gaussian rough phase (as is the case(More)
We used strong inference with Akaike's Information Criterion (AIC) to assess the processes capable of explaining long-term (1984-1995) variation in the per capita rate of change of mottled sculpin (Cottus bairdi) populations in the Coweeta Creek drainage (USA). We sampled two fourth-and one fifth-order sites (BCA [uppermost], BCB, and CC [lowermost]) along(More)
We investigated host fishes, timing and modes of glochidial release, and host-attraction strategies for 7 species of freshwater mussels from the Buttahatchee and Sipsey rivers (Mobile Basin), Alabama and Mississippi, USA. We determined hosts as fish species that produced juvenile mussels from laboratory-induced glochidial infections. We established the(More)
The proximal mechanisms determining social dominance are not well understood. We used the highly territorial lizard A. cristatellus to test two main hypotheses: (1) that male social dominance is associated with locomotor abilities; (2) that locomotor abilities (maximal performance), as measured in the laboratory, are correlated with behaviour in the field.(More)