Gravity, during the Age of Dinosaurs, was lighter than today, so the lift of any flying animal was ligther than today. As a consequence, to be able to fly, flying reptiles needed giant wings, so they needed to be giant. This inabilty to sustain injury is one of the primary reasons why modern bats have very rarely developed the ground feeding habits of birds. Sea resources are going to be redistributed. Food chain will be totally changed.
Water is now heavier.
Global volume of fresh available water, under low pressure, will decrease. Animals living inside will have a more difficult life. Lots of seaweed species and sea animals are going to die too. In the oceans gravitational effects could be even more drastic than on the land, since water pressures increase far more rapidly with depth than air pressure. The sea-going reptiles were obligate air breathers.