The ecology and life history The ecology and life history of the common frog (Rana temporaria temporaria) ecologylifehisto00sava Year: 1962 EXTERNAL FACTORS ON THE SPAWN DATE 133 but, once drawn, arc quite easy to understand, for the principle is identical to that of an ordinary contour map. In fact, a map could be called a 'joint functional regression diagram, with latitude and longi- tude as the independent variables, and altitude as the dependent ISOPHENES IN YEAR-DAYS 100 200 300 RAINFALL IN MILLIMETRES Fig. 35. Joint Functional Regression Diagram, Showing the Relation between Rainfall
The ecology and life history The ecology and life history of the common frog (Rana temporaria temporaria) ecologylifehisto00sava Year: 1962 EXTERNAL FACTORS ON THE SPAWN DATE 133 but, once drawn, arc quite easy to understand, for the principle is identical to that of an ordinary contour map. In fact, a map could be called a 'joint functional regression diagram, with latitude and longi- tude as the independent variables, and altitude as the dependent ISOPHENES IN YEAR-DAYS 100 200 300 RAINFALL IN MILLIMETRES Fig. 35. Joint Functional Regression Diagram, Showing the Relation between Rainfall and Temperature, and Spawning Date, for the Month M2 Note that there is a strong temperature effect above about 5°C or 6°C, but little rainfall effect in this region of the diagram. At lower temperatures, there is a rainfall effect, but very little temperature effect. In aU these diagrams, the shaded areas indicate that there are either no records at all with the corresponding variables, or too few for reUable results. variable.' It is shorter to say 'map,' but there is no word to corre- spond when the independent variables are different, such as tempera- ture and rainfall, and the dependent variable is spawn date. The different months were denoted Mo, Mi, M2, because the month in which spawning takes place (Mo) differs so much in different parts of the country that if the calendar months were used for the
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