The embryonic development and hatching of C . diaphanus under natural conditions were investigated . Most of the embryonic development takes place during the dry period of the pond . Thus eggs are ready to hatch as soon as the pond is filled with rainwater .

No abstract

Seasonal fluctuations of the physicochemical conditions were recorded from five temporary ponds in the New Forest, over a period of two years . Diurnal fluctuations were also recorded . Physicochemical factors studied were pond volume ; air, water and substratum temperature ; water PH ; water conductivity ; and water dissolved oxygen level . The observed patterns of fluctuation are discussed and a concept of pond stability, to which the fluctuations may be related, is advanced .

No abstract

A comparison between the two cladoceran species Moina macrocopa Strauss and Moina micrura Kurz in respect of their seasonal population changes in Zoafaraniyah pools was made . Seasonal fluctuations of some physicochemical factors were also recorded over a period of one year.