Starting in 1161, the ecological condition shifted toward drought conditions.

These data are expected to help scientists study changing ecological conditions and advise when to close beaches.

But since the spill, the sound's overall ecological condition appears to have suffered, state and Federal scientists say.

They concluded that female choice might indeed vary in different ecological conditions.

The realized niche is the set of environmental plus ecological conditions under which a species persists.

"In our day, with its changed ecological conditions, this excess has become a serious danger to mankind."

Few paid much attention to the ecological condition of the kills until the late 1960's.

For a successful culture, the ecological conditions will have to be taken into consideration (soft, cool and strong water movement).

Giant reed is adapted to a wide variety of ecological conditions.

It showed that the ecological condition of the river had declined.