| Microbial nitrate in the forest floor was depleted in 15N relative to that exported in groundwater and headwater streams. |
| Madre de Dios River, Spanish Río Madre De Dios, headwater tributary of the Amazon in southeastern Peru and northwestern Bolivia. |
| Visitors can then reach the headwater ponds of the Main River in about 45 minutes by arranging a helicopter or float plane, in advance. |
| Monitor water quality in headwater lakes and streams, and characterize those for which insufficient information is available. |
| The solid line on Map 1 shows the verified drainage divide between Lac de Gras and the headwater lakes of the Lockhart River system. |
| Some populations like Early Stuart sockeye cover 1,100 kilometres to their headwater spawning areas. |
