Wednesday, 26 June 2013

DIFS/SAIAB Seminar Dr Romina Henriques: The Benguela Current

Dr Romina Henriques: The Benguela Current – a natural laboratory to study evolution.

Lecture Room, DIFS

Thursday 27 June 2013
10.30 a.m.
Abstract
Oceanographic features, such as currents, fronts and upwelling cells, have been recognized as possible factors driving population differentiation within marine species.The Benguela Current, in southwestern Africa, is considered to be a major biogeographical barrier to the dispersion of tropical species between the Atlantic and Indo-Pacific Oceans.

Wednesday, 5 June 2013

DIFS/SAIAB Seminar Dr Jackie Hill Community dynamics of an invaded ecosystem

DIFS/SAIAB Seminar
Dr Jackie Hill

Community dynamics of an invaded ecosystem: investigation of a Pterygoplichthys disjunctivus invasion in the Nseleni River system, KwaZulu-Natal, South Africa.

Venue: Lecture Room, SAIAB
Date:     Thursday, 6 June 201
Time:    3.30pm


Abstract
Increases in urbanization and anthropogenic activity within watersheds is globally recognized as one of the main drivers of eutrophication to date, and excessive nitrogen loads in aquatic systems can result in widespread ecosystem degradation including: hypoxia, toxic algal blooms, increased turbidity, disruption of ecosystem functioning and the loss of biodiversity. Aquatic ecosystems compromised by increased N-loading have a lower capacity for system resilience and often face further threats to ecological integrity by the establishment of invasive species. Despite existing legislation regarding the import and sale of exotic species worldwide, the establishment of invasive species in many aquatic ecosystems has been the result of accidental or deliberate introduction via the aquarium trade.