. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. QUATERNARY OSTRACODS FROM SOUTH-WESTERN AFRICA 593. Fig. 5. The most abundant ostracod species on the continental shelf off south-western Africa arranged in order of latitudinal centre of distribution (mean of all observed sites, see Figure 6). Vertical bars are degrees of latitude (S); horizontal scales = 100/z. A = Australoecia fulleri, B = Cytherella dromedaria, C = Neocaudites osseus, D = Xestoleberis hartmanni, E = Buntonia deweti, F = Coquimba birchi. the sensitivity of the species to change in
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. QUATERNARY OSTRACODS FROM SOUTH-WESTERN AFRICA 593. Fig. 5. The most abundant ostracod species on the continental shelf off south-western Africa arranged in order of latitudinal centre of distribution (mean of all observed sites, see Figure 6). Vertical bars are degrees of latitude (S); horizontal scales = 100/z. A = Australoecia fulleri, B = Cytherella dromedaria, C = Neocaudites osseus, D = Xestoleberis hartmanni, E = Buntonia deweti, F = Coquimba birchi. the sensitivity of the species to change in the parameter. In addition, correlation coefficients based on simple regression analyses are presented to show the relationships between the environmental variables (Table 3). To aid reliability, descriptive statistics and correlation coefficients were performed only on samples containing > 100 valves (n = 45). Exceptions to this standard were regional latitudinal and depth distributions, and averages for environmental parameters for the following species, whose ranges into deeper water precluded its use: Krithe capensis, K. spatularis, Buntonia rosenfeldi and Henryhowella melo/jesioides. PHYSICAL OCEANOGRAPHY Latitudinal and depth distribution Figure 6 shows the total and averaged north-south distribution of the most abun- dant species. Most species (19; 53%) have their northern limits straddUng the Walvis Ridge, whereas others occur in the vicinity of Walvis Bay (7), Orange River (7) and the Cape Peninsula (3). In contrast, 33 species (92%) have their southern limits south of the Cape Peninsula. The averaged position for each species is an indication of its centre of distribution (based on the number of observed sites). With the exception of three species, these all lie south of 27°S (Liideritz), and only Bensonia knysnaensis robusta and Palmoconcha walvis- baiensis have their centres of distribution north of 23°S (Walvis Bay). Figures 3-5 illustrate each of the most ab
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