| The two forms of stickleback co-occur in the transition areas between the lake and stream, especially during the breeding season. |
| I don't think I want to poke at that one any more closely, except to say that high infant mortality rates and higher fertility tend to co-occur. |
| However, the presentation of delirium is the same regardless of whether dementia is present because symptoms of delirium will dominate when they co-occur. |
| Blueback herring occur in fewer rivers and are generally less abundant than alewives where both species co-occur. |
| He makes the point, however, that not all risk factors have to be present for criminal behavior to occur, and that many such factors co-occur. |
| There are numerous studies that have found that marital distress tends to co-occur with a wide range of psychiatric symptoms and syndromes. |
