Answer:
increase; decrease
Step-by-step explanation:
A temperate region have moderate and mild climate. The temperature is neither to high nor too low. It receives moderate rainfall yearly and there is supply of water. Thus a river flowing through the temperate region will increase its discharge as there is availability of water.
A arid region has dry weather. It has hot climatic conditions. Very less rainfall occurs in arid regions. Thus a river flowing in an arid area dries up and thus it have less discharge flowing downstream.