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Robust abundance estimates of wild animal populations are needed to inform management policies and are often obtained through mark–recapture (MR) studies. Visual methods are commonly used, which limits data collection to daylight hours and good weather conditions. Passive acoustic monitoring offers an alternative, particularly if acoustic cues are naturally produced and individually distinctive. Here we investigate the potential of using individually distinctive signature whistles in a MR framework and evaluate different components of study design.

Knowledge of the occurrence and distribution of cetaceans is particularly important for conservation and management, but is still limited within Namibian waters. We collated 3211 cetacean records from the Namibian Exclusive Economic Zone (EEZ) for the period 2008 to 2016 and applied the principle of minimum cross entropy (MinxEnt) to predict habitat suitability. MinxEnt is a generalised form of maximum entropy modelling that allows incorporation of additional information such as sampling bias.

Aerial stratified sample counts have been conducted since 1995 in Etosha. The 2015 aerial count of Etosha was conducted from 4 September till 21 September. Including the latter survey, a total of eight comparable multi-species counts have been completed since 1995.

This proposed study focuses on the elephants of the Kunene/Etosha cluster. The elephants outside Etosha is still largely a free ranging population over much of a 100 000 km² range. For the purpose of this proposal the study area (Figure 1) encompasses the extreme western area of Etosha, Skeleton Coast Park, communal conservancies, concessions and the private farming land south of Etosha. The average rainfall ranges from <50mm to 300mm. Recently, human-elephant conflicts have received a lot of attention in this Region.

Aerial surveys have been conducted in Etosha National Park since 1968. These counts were strictly not comparable as they were undertaken at irregular intervals with different coverage, The first comprehensive sample count was done 1995, Since then sample counts were completed in 1998 and 2002. The 2002 survey is therefore the fourth complete sample count of Etosha. The objectives of the 2002 survey were as follows: 1. To provide comparable estimates and trend data for the most important species surveyed in support of speies management plan. 2.

Aerial surveys have been conducted in Etosha National Park since 1968. These counts were strictly not comparable as they were undertaken at irregular intervals with different coverage, The first comprehensive sample count was done 1995, Since then sample counts were completed in 1998 and 2002. The 2002 survey is therefore the fourth complete sample count of Etosha. The objectives of the 2002 survey were as follows: 1. To provide comparable estimates and trend data for the most important species surveyed in support of speies management plan. 2.