Population Characteristics of Lotic Orangespotted Sunfish

Genetic Variation within a Lotic Population of Janthinobacterium lividum.

An understanding of the genetic variation within and between populations should allow scientists to address many problems, including those associated with endangered species and the release of genetically modified organisms into the environment. With respect to microorganisms, the release of genetically engineered microorganisms is likely to increase dramatically given the current growth in the...

Sunfish cognition and pseudoreplication

In a recent study Dugatkin & Wilson (1992) tested for cognitive abilities in bluegill sunfish. They found that when a focal fish was allowed to forage with different companions, it was able to remember with which ones it had had greatest success and to use this information in future interactions. Moreover, fish seemed to prefer to associate with familiar conspecifics over unfamiliar ones. A num...

Characteristics of the Population

tional health (OH) in Mexico, including socioeconomic context, legislation, health system, and educative and investigative resources, as well as the practice of OH. Workplace accidents per 100 workers decreased from 7.23 to 2.3 workers in 20 years; deaths decreased from 1.68 to 0.9 per 10,000 workers, while the occupational disease rate increased from 0.6 to 1 per 10,000 workers. This can be in...

Effects of Invertebrates in Lotic Ecosystem Processes

River Impoundment and Sunfish Growth

Impoundment of rivers by dams is widespread and one of the most devastating anthropogenic impacts to freshwater environments. Linking theoretical and applied research on river impoundment requires an improved capacity for predicting how varying degrees of impoundment affects a range of species. Here, growth of 14 North American sunfish species resilient to river impoundment was compared in rive...