Publicado por Bijleveld, Utrecht, 1974
Librería: Emile Kerssemakers ILAB, Heerlen, Holanda
EUR 16,00
Cantidad disponible: 1 disponibles
Añadir al carrito22 cm. paperback. 428 pp. bibliography. -thesis, with a summary in english. -(corner bumped, good). 777g.
Año de publicación: 1993
Librería: ConchBooks, Harxheim, Alemania
EUR 5,75
Cantidad disponible: 1 disponibles
Añadir al carritoSpecimens of Spadella cephaloptera from Tenerife, Gran Canaria and Gomera (Canary Islands) were compared biometrically in regards to morphometric and meristic characters. Variation exists among the populations on the islands as well as between the islands. The populations on Gomera seem more distinct from the populations on Tenerife and Gran Canaria than the two latter are mutually. An apparent decline in the number of adults occurs in July, which is related to a decrease in the number of eggs. A shortage of food can explain the reduced fecundity of the specimens. S. cephaloptera prefers habitats protected from the influence of waves. 13 pp., 3 figs, 4.