Supplementary Information

Assessment of the likely sensitivity to climate change for the key marine species in the southern Benguela system Ortega-Cisneros, S Yokwana, W Sauer, K Cochrane, A Cockcroft, NC James, WM Potts, L Singh, M Smale, A Wood and G Pecl African Journal of Marine Science 40(3): 279–292 https://doi.org/10.2989/1814232X.2018.1512526

Supplementary Tables S1–S40 Table of Contents

Table 1: Abalone ...... 3 Table 2: Albacore ...... 5 Table 3: Anchovy ...... 7 Table 4: Black musselcracker ...... 9 Table 5: Brown mussels ...... 11 Table 6: Cape horse mackerel ...... 13 Table 7: Cape stumpnose ...... 15 Table 8: Carpenter ...... 17 Table 9: Chub mackerel ...... 19 Table 10: Deep-water hake ...... 21 Table 11: Galjoen ...... 24 Table 12: Geelbek ...... 26 Table 13: Gurnard ...... 28 Table 14: Harder ...... 30 Table 15: Kingklip ...... 32

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Table 16: Dusk kob ...... 35 Table 17: Monkfish ...... 37 Table 18: Panga ...... 39 Table 19: Red roman ...... 41 Table 20: Red stumpnose ...... 43 Table 21: Sardine ...... 45 Table 22: Seaweeds ...... 47 Table 23: Shallow-water hake ...... 49 Table 24: Silver kob ...... 52 Table 25: Smoothhound shark ...... 54 Table 26: Snoek ...... 56 Table 27: Sole ...... 58 Table 28: Soupfin shark ...... 60 Table 29: South coast rock lobster ...... 62 Table 30: Spotted grunter ...... 64 Table 31: Spotted gully shark...... 66 Table 32: Squid ...... 68 Table 33: St Joseph ...... 70 Table 34: West coast rock lobster ...... 72 Table 35: West coast steenbras ...... 74 Table 36: White musselcracker ...... 76 Table 37: White steenbras ...... 78 Table 38: White stumpnose ...... 80 Table 39: Yellowtail ...... 82 Table 40: Yellowfin tuna ...... 84

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Table S1: Abalone Attribute Criteria Actual value for species Category Score Ref to data source/pub Data quality Comments A female of 115 mm SW produced 4.5 million eggs per spawning, and Fecundity a female of 160 mm produced >20 000 eggs per year 1 Newman (1967) 3 more than 15 million eggs per spawning (Newman 1967) Recruitment period (to Consistent Consistent 1 Wood and Buxton (1996) 3 fishery) Males attained 50% sexual maturity at 18 months (i.e. 25 mm shell width), females attained 50% sexual maturity at 24 months (30 Wood and Buxton (1996), Average age at maturity mm shell width). However, 50% 2–10 years 2 3 Visser-Roux (2011) sexual maturity was reported at a shell width of 35 mm (i.e. 30 months of age). Eastern Cape 2–3 years, Western Cape 3–6 years Abundance Catch being maintained Stock status Heavily depleted Threatened 3 DAFF (2016) 3 even though high and illegal Stock is experiencing moderate stress other Illegal fishing and over-exploitation, than fishing. Stock is DAFF (2016), Additional stressors also habitat change in an area that 2 3 experiencing no more Blamey and Branch (2012) was a key fishing ground than three known stressors H. midae recruits occurred exclusively on encrusting coralline Tarr (1995), Day and algae and prefer strongly textured Reliance on either Generalist vs specialist 2 Branch (2000), Zeeman et 2 corallines. Adults mainly feed on habitat or prey al. (2012) drift kelp, but also on some other attached algae Average 1.83 0

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Settlement occurs a week to a month after the veliger stage, Capacity for larval dispersal <2 weeks 3 Visser-Roux (2011) 3 depending on the species and ambient conditions Movement of a small population of adult H. midae was studied over a three-year period, after which 47% of the original abalone were still present on the study site. Of these, Capacity for adult/juvenile Tarr (1995), 81.5% still occupied exactly the <10 km 3 3 movement Newman (1966) same position on the rocks. This Distribution indicates that H. midae that have located an optimum habitat, and that are not disturbed, tend not to move Distribution from St Helena Bay to Lindberg (1992), DAFF Physiological tolerance <10º latitude 3 3 Port St Johns, South Africa (2016) Assumed that the Spatial availability of Already occupying its potential Limited unoccupied