Intraspecific Variation in Growth and Reproduction of the Marine Leech, Heptacyclus buthi.

Heptacyclus buthi was harvested from fish hosts in rocky intertidal zones of Sonoma and Marin Counties, California, in October 2008 (n = 162) and October 2010 (n = 51). The size of the leeches was quantified using a method that approximated the sagittal cross-section of each specimen. Size-frequency curves were modeled to estimate the number of size-class cohorts in each year.

A Comparison of Isogenic Homozygous Clone and Wildtype Zebrafish (): Survival and Developmental Responses to Low pH Conditions.

The value of bioassays as analytical methods for assessing the potency of particular stressors on live animal models depends on the precision of their results, which are greatly influenced by the choice of test subjects. The genetic makeup of experimental subjects varies, and, as such, so will their responses to the test environment. Genetic diversity of test populations may contribute to statistical variability; therefore, the use of genetically similar subjects may enhance the utility of bioassays.