Jordan's rule
Encyclopedia
Jordan's rule named after the father of American ichthyology
David Starr Jordan
describes the inverse relationship
between water temperature and meristic characteristics. The most common found relationship is for fin ray, vertebrae, or scale numbers to increase with decreasing temperature.
Ichthyology
Ichthyology is the branch of zoology devoted to the study of fish. This includes skeletal fish , cartilaginous fish , and jawless fish...
David Starr Jordan
David Starr Jordan
David Starr Jordan, Ph.D., LL.D. was a leading eugenicist, ichthyologist, educator and peace activist. He was president of Indiana University and Stanford University.-Early life and education:...
describes the inverse relationship
Inverse relationship
An inverse or negative relationship is a mathematical relationship in which one variable, say y, decreases as another, say x, increases. For a linear relation, this can be expressed as y = a-bx, where -b is a constant value less than zero and a is a constant...
between water temperature and meristic characteristics. The most common found relationship is for fin ray, vertebrae, or scale numbers to increase with decreasing temperature.