OpenUCT Home
→
Browsing by Author

Browsing by Author "Merkle, D"

Now showing items 1-5 of 5

A final record of the generation of data used in the 2011 sardine and anchovy assessments

Author: De Moor, Carryn L ; Coetzee, J ; Durholtz, D ; Merkle, D ; van der Westhuizen, J J Date: 2011 The data to which the South African anchovy and sardine assessments are tuned are not raw data. Some of the data have already been subjected to a number of analyses and refinements. These associated calculations are often done “behind the ... Read more
Populations of surface-nesting seabirds at Marion Island, 1994/5-2002/3

Author: Crawford, R J M ; Cooper, J ; Dyer, B M ; Greyling, M D ; Klages, N T W ; Ryan, P G ; Petersen, S L ; Underhill, L G ; Upfold, L ; Wilkinson, W ; De Villiers, M S ; Du Plessis, S ; Du Toit, M ; Leshoro, T M ; Makhado, A B ; Mason, M S ; Merkle, D ; Tshingana, D ; Ward, V L ; Whittington, P A Date: 2003 During the 1990s and early 2000s, populations of surface-nesting seabirds at Marion Island showed different trends, but for the majority of species numbers decreased. Reduced numbers of gentoo penguins Pygoscelis papua, eastern rockhopper ... Read more
A record of the generation of data used in the 2012 sardine and anchovy assessments

Author: De Moor, Carryn L ; Coetzee, J ; Durholtz, D ; Merkle, D ; van der Westhuizen, J J ; Butterworth, Doug S Date: 2012 The data to which the South African anchovy and sardine assessments are tuned are not raw data. Some of the data have already been subjected to a number of analyses and refinements. These associated calculations are often done “behind the ... Read more
Refined estimates of South African pelagic fish biomass from hydro-acoustic surveys: quantifying the effects of target strength, signal attenuation and receiver saturation

Author: Coetzee, J C ; Merkle, D ; de Moor, C L ; Twatwa, N M ; Barange, M ; Butterworth, Doug S Date: 2008 The biomass of small pelagic fish species off the coast of South Africa has been monitored since 1984 using hydro-acoustic survey techniques. These time-series of spawner biomass and recruitment estimates form the basis for management of both ... Read more
Refined estimates of South African pelagic fish biomass from hydro-acoustic surveys:quantifying the effects of target strength, signal attenuation and receiver saturation

Author: Coetzee, J C ; Merkle, D ; De Moor, Carryn L ; Twatwa, N M ; Barange, M ; Butterworth, Doug S Date: 2008 The biomass of small pelagic fish species off the coast of South Africa has been monitored since 1984 using hydro-acoustic survey techniques. These time-series of spawner biomass and recruitment estimates form the basis for management of both ... Read more

Now showing items 1-5 of 5

Browse

All of OpenUCT

Browsing by Author "Merkle, D"

Browsing by Author "Merkle, D"

Browse

All of OpenUCT