By Guy R. McPherson
This quantity bridges the distance among ecology and normal source administration and, particularly, makes a speciality of plant ecology as a starting place for crops and natural world administration. It describes how innovations and techniques utilized by ecologists to review groups and ecosystems should be utilized to their administration. man R. McPherson and Stephen DeStefano emphasize the significance of thoughtfully designed and carried out medical reviews to either the development of ecological wisdom and the appliance of strategies for the administration of plant and animal populations.
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Subsequently attempted to correlate patterns of above- and below-ground morphology with the seasonal growth patterns of plants. This aspect of the paper was characterized by strongly stated conclusions based on little evidence. Case study: spacing of acorn woodpeckers Campbell (1995) reanalyzed the data of Burgess et al. (1982) on the spacing patterns of acorn woodpeckers (Melanerpes formicivorus). Based on graphical analysis, Campbell determined that acorn woodpeckers exhibited regular spacing.
Stapp (1997) addressed this concept in a removal study of shortgrass prairie rodents in shrub-dominated shortgrass prairie in Colorado, asking if the structure of the rodent community was the result of competition or predation. During one summer, Stapp compared abundance, microhabitat use, and diet of deer mice (Peromyscus maniculatus) on four areas where northern grasshopper mice (Onychomys leucogaster) and deer mice coexisted with four areas where grasshopper mice had been removed. Both species consume a similar diet of arthropods, but grasshopper mice also eat deer mice and other rodents.
These studies have important implications for the management and recovery of threatened or endangered species. 31 32 Interactions C A S E S T U DY: R E M OVA L E X P E R I M E N T – C O M P E T I T I O N Petren and Case (1996) studied competition between two species of geckos in urban and suburban environments in the Pacific basin. The native species, Lepidodactylus lugubris, declines numerically when a nonnative species, Hemidactylus frenatus, invades its habitat. Replacement of Lepidodactylus by Hemidactylus occurs rapidly and is facilitated by clumped insect resources, suggesting that the mechanism of displacement is due to the ability of each species to exploit food resources.