| The accumulated data base provides invaluable information for ecologists and zoogeographers. |
| Declared biologically dead in 1957, the Thames is now awash with wildlife, ecologists say. |
| The ecologists found, however, that the saltiness of rural streams has increased steadily for the past thirty years. |
| Their prescriptions, in consequence, dramatically differ from those of the deep ecologists. |
| In the past, ecosystem ecologists have focused considerably more attention on the cyling of nitrogen in terrestrial ecosystems than phosphorus. |
| Trawling bothers ecologists who aver that it ruins the ocean-floor habitat of many fish species. |
