Applying an index of biotic integrity based on fish assemblages in a west african river

A multivariate measure of river quality, the Index of Biotic Integrity (IBI), was adapted to a West African river, the Konkoure (Republic of Guinea). Fish assemblages were sampled using gill-nets during the dry season to provide data for the IBI. Ten metrics were subsequently defined. The capacity of the modified IBI to assess the impact of a bauxite treatment plant was tested. The IBI decreased as expected at the impacted station. Detailed examination of the data revealed that one family, the #Mormyridae$, was almost eliminated from the impacted station, suggesting that members of this family can be considered as intolerant species in future uses of the IBI in other African rivers. (Résumé d'auteur

Паризький хранитель часу з Одеси

У астрономів є така посада — хранитель часу. Точніше, вона існувала до другої половини ХХ століття, до появи атомного годинника. Нині ця посада зветься «учений — хранитель атомного еталона часу» і більше стосується техніки. Але наша розповідь про минуле