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Phenotypic plasticity has important ecological consequences because the strengths of species interactions can change with the behavior and morphology of interacting individuals. Evolutionary studies of plasticity can predict conditions under which shifts in phenotypes will occur and, therefore,...
Allochthonous marine input is a key component of the dynamics of islands and terrestrial coastal ecosystems on islands in the Gulf of California, Mexico, where an unproductive desert juxtaposes a highly productive ocean. In this area, seabirds are a major conduit bringing marine productivity to...
The maximal running speeds of lizards have commonly been measured using level racetracks in a laboratory, but the normal speeds of locomotion of lizards and most animals in their natural habitats are not well documented. Thus we quantified the locomotor activity of the lizard Uma scoparia in its...
Bimodal patch occupancy frequency distributions regularly appear in studies of a variety of taxa at a variety of spatial scales. Metapopulation models associated with the core––satellite hypothesis and a strong rescue effect predict the occurrence of this bimodality. However, there have been...
Humic lakes with high inputs of allochthonous dissolved organic carbon have a pelagic food chain that, to a large extent, is based on bacterioplankton energy mobilization from allochthonous organic carbon compounds. This is in contrast to clear lakes in which total pelagic production is based...
Theory suggests that a source––sink structure for a prey species can promote the persistence of an otherwise nonpersisting predator––prey interaction. Using a heliozoan protist predator, Actinosphaerium nucleofilum, and a ciliated protozoan prey species, Tetrahymena pyriformis, we tested...
A severe drought in northern Arizona caused widespread pinyon ( Pinus edulis ) mortality, exceeding 40%% in some populations. We measured tree-ring widths of pinyons that survived and that died in three sites designated as ““high,”” ““medium,”” and ““low”” stress. Growth...
Current paradigms relating to reptilian temperature regulation are derived almost entirely from data on diurnally active species, although many reptile species are nocturnal. We investigated the extent and behavioral mechanisms of temperature regulation in the nocturnal, rock-dwelling marbled...
Despite its potential importance as a source of fitness variation in natural plant populations, few studies have so far examined long-term patterns of individual differences in progeny viability under natural conditions. This paper reports on a six-year field study on the differences in progeny...
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