Some water fleas Daphnia change their head morphology to reduce predation risk in response to chemical substances (kairomones) released from larvae of the invertebrate predator Chaoborus (Insecta: Diptera). We tested for evidence of the costs associated with elongation of the head spine in Daphnia galeata and the consequences of these costs on the inducibility of head spine elongation... https://www.kingarte.com/product-category/pump-accessorieshydraulic-pumps-plumbingpumps-industrialhydraulics-pneumatics-pumps/