| The difficulty of diagnosis is increased by the fact that the abiotic factor responsible for the disease may not be present in the plant sample. |
| Our results show how biotic and abiotic effects operate synergistically to determine the distribution of these species. |
| Furthermore, different guilds within the herbivore trophic level may be influenced differently by N addition, predators, and abiotic conditions. |
| This is distinct from the notion of selection deriving from pressures exerted by the biotic and abiotic environment inhabited by the organism. |
| The first important abiotic factor affecting potato productivity is drought and it has a large influence on productivity. |
| It has been assumed that the formation of these sinters and their associated metalliferous sulphides is due to abiotic processes. |
