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Institute for Coastal and Marine Research

 

EBSA overview  |  Delineation |   Proposed description

 

 

EBSA overview

Cape Fria is a coastal EBSA in northern Namibia, 50 km south of the border with Angola. The EBSA encompasses Cape Fria itself, and Angra Fria: a small, prominent bay to the north. Here, the continental shelf is at its narrowest in Namibia, and there is an intense upwelling cell, second only to that found at Lüderitz, which enhances local productivity. Consequently, several top predators use this area as a foraging ground. The EBSA thus extends 100 km along the shore, and 40 km offshore to depths of <250 m in the north (where seals forage) and 5 km offshore in the south (where Damara Terns forage). The upwelling cell also marks the northern boundary of the Benguela Current. Therefore, Cape Fria falls within a biogeographic transition zone, with a relatively high local biodiversity because it comprises species at both the northern and southern limits of their distributions. There is evidence that the area is critical for aggregations of almost the entire global population of Damara Tern, a Benguela System endemic, during specific periods of the year. It is also an important breeding site for Cape fur seals. Given its remote location, the coast is in relatively pristine condition, but may be threatened by industrial development in the future.

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Delineation

Open or collapse the legend as a sidebar by clicking the icon in the top left corner of the map. In the legend you can turn on/off the old/new extents of the EBSA. You can zoom in/out using the mouse or the +/- buttons on the map, and click on the features for more information.

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Proposed EBSA description

NOTE: Read this here, or download the Word document on the right sidebar.

 

Abstract

Cape Fria is a coastal EBSA in northern Namibia, 50 km south of the border with Angola. The EBSA encompasses Cape Fria itself, and Angra Fria: a small, prominent bay to the north. Here, the continental shelf is at its narrowest in Namibia, and there is an intense upwelling cell, second only to that found at Lüderitz, which enhances local productivity. Consequently, several top predators use this area as a foraging ground. The EBSA thus extends 100 km along the shore, and 40 km offshore to depths of <250 m in the north (where seals forage) and 5 km offshore in the south (where Damara Terns forage). The upwelling cell also marks the northern boundary of the Benguela Current. Therefore, Cape Fria falls within a biogeographic transition zone, with a relatively high local biodiversity because it comprises species at both the northern and southern limits of their distributions. There is evidence that the area is critical for aggregations of almost the entire global population of Damara Tern, a Benguela System endemic, during specific periods of the year. It is also an important breeding site for Cape fur seals. Given its remote location, the coast is in relatively pristine condition, but may be threatened by industrial development in the future.

 

Introduction

Cape Fria, also known as Cape Frio, is located along the northern Namibian coast, adjacent to the Skeleton Coast Park. This site was not included in the initial set of EBSAs proposed for Namibia because: it was identified only during a gap analysis of the Namibian EBSA network; local knowledge of the Damara Tern aggregations (see below) was not available at the original South Eastern Atlantic EBSA Workshop in 2013 (UNEP/CBD/RW/EBSA/SEA/1/4); and data and information on the area are both relatively limited because it is so remote. During the gap analysis, it was determined that Cape Fria is a separate EBSA from the Namibe EBSA (previously named: Kunene-Tigres), rather than an extension of it, because it is centred around a separate upwelling cell that is not connected to the upwelling cell that enhances productivity in Namibe.

 

The Cape Fria EBSA lies at the northern limit of the Benguela Current, possibly influenced by the Angola-Benguela Frontal Zone, and thus within the transition zone between the temperate and sub-tropical bioregions. The larger component extends 40 km offshore, and includes inshore waters on the narrowest portion of the Namibian shelf, spanning a depth range of 0-250 m. It also includes a narrower coastal extension for approximately 60 km alongshore to the south, and approximately 5 km offshore. The unusual shape of this EBSA reflects the foraging ranges of different species that are responding to the upwelling-driven productivity. The broad northern portion is the foraging range of Cape fur seals, because that area supports an important breeding Cape fur seal colony. The narrower southern portion represents the foraging range of Damara Terns that rest on the adjacent shore. Interestingly, this EBSA appears to contain almost the entire global population of Damara Tern on a seasonal basis. Cape Fria EBSA also includes important threatened benthic shelf habitats. This site comprises a collection of features and ecosystems that are connected by the same ecological processes, but some features (e.g., the Damara Tern aggregations) are emphemral; therefore, it is proposed as a Type 2/3 EBSA (sensu Johnson et al. 2018).

 

Location

Cape Fria is located about 50 km south of the border between Namibia and Angola. The main body of the Cape Fria EBSA extends 40 km offshore and 100 km along the coast, while an additional section of inshore habitat extends alongshore for approximately 60 km southwards and has a width of approximately 5 km offshore. It lies entirely within Namibia’s national jurisdiction.

 

Feature description of the proposed area

The Cape Fria EBSA includes coastal and nearshore elements, and thus described for both benthic and pelagic features. It was identified in a gap analysis (using a systematic conservation planning approach) as an important inshore focus area for conservation of biodiversity features that are not yet sufficiently represented in the existing Namibian EBSA and marine protected area network (Holness et al., 2014). Local habitat heterogeneity is relatively high in this area, with 17 habitat types identified (Holness et al., 2014; Table in the Other relevant website address or attached documents section). Two of these habitats are Endangered: Central Namib Outer Shelf and Kunene Outer Shelf, with the EBSA being particularly important for the latter. In addition, a small portion of the Vulnerable Kunene Shelf Edge habitat type is also found within the Cape Fria EBSA. These threat statuses were determined by assessing the weighted cumulative impacts of various pressures (e.g., extractive resource use, pollution, development, and others) on each habitat type for Namibia (Holness et al., 2014; Table in the Other relevant website address or attached documents section).

 

Importantly, productivity offshore of Cape Fria is high because it is the site of the second-most intensive upwelling cell in Namibia. Here upwelling is driven both by wind and bottom topography because the site is at the narrowest portion of the continental shelf (Sakko, 1998); further, the wind shadow and poleward currents also contribute to phytoplankton blooms (Jury, 2017). This elevated productivity is at the heart of the EBSA, because it consequently forms a key foraging area for several top predators. The Cape Fria coast supports an important breeding site for Cape fur seals, Arctocephalus pusillus pusillus, with an increasing local population, compared to largely declining populations in southern Namibia (Kirkman et al., 2012). These seals spend time foraging in the northern portion of the EBSA. Cape Fria also supports several species of shore- and seabirds, including over-wintering Palearctic migrant bird species. Most notably, there is evidence that Cape Fria may contain, either seasonally or episodically, almost the entire global population of Damara Tern, Sternula balaenarum, a vulnerable species, endemic to the Benguela System (Braby et al., 1992). The focus area appears to be an annual congregation site prior to the flock migrating northwards. It has been suggested that this is likely to be linked to high food availability, i.e., a high-energy coastline with a presumably reliable food source that is available at night and within about 5 km of the shore. Damara Terns forage more in the southern portion of the EBSA, closer to the shore compared to that of the seals.

 

Although bird diversity and abundance are fairly low at Cape Fria (Tarr & Tarr, 1987), it may support a relatively high local biodiversity overall because it is situated within the transition zone between the temperate and sub-tropical bioregions (Sakko 1998). Consequently, the communities at Cape Fria comprise species from both bioregions at the northern and southern limits of their respective distributions. This includes various linefish and other commercially important species, such as deep-water hake (Holtzhausen et al., 2001, Kirchner et al., 2011), large-eye dentex (Dentex macrophthalmus), thinlip splitfin (Synagrops microlepis), longfin bonefish (Pterothrissus belloci) and the African mud shrimp (Soleonocera africana; Bianchi et al., 1999).

 

Feature condition and future outlook of the proposed area

Cape Fria and surrounds is a remote coastal area adjacent to the Skeleton Coast National Park. The focus area is inaccessible to the public, with only limited tourism permitted in the area, and consequently, this area is near-pristine. According to data from Holness et al. (2014) nearly 90 % of the area is classified as being in good condition, with almost all of the remaining area classified as being in fair condition. Inshore and coastal habitats are in particularly good condition and are effectively well protected as a result of their remote location and the terrestrial Skeleton Coast National Park. However, pending plans to build an industrial port and associated infrastructure at Cape Fria or Angra Fria (Paterson, 2007) could potentially impact this. Onshore and offshore prospecting and mining (i.e., diamonds, oil, precious metals) is minimal at present but is expected to occur in the future.

 

References

Bianchi, G., Carpenter, K.E., Roux, J-P., Molloy, F.J., Boyer, D., Boyer, H.J. 1999. FAO species identification guide for fishery purposes. Field guide to the living marine resources of Namibia. Rome, FAO. 265pp.

Braby, R., Braby, S.J., Simmons, R.E. 1992. 5000 Damara Terns in the northern Namib Desert: a reassessment of world population numbers. Ostrich, 63: 133-135.

Holness, S., Kirkman, S., Samaai, T., Wolf, T., Sink, K., Majiedt, P., Nsiangango, S., Kainge, P., Kilongo, K., Kathena, J., Harris, L., Lagabrielle, E., Kirchner, C., Chalmers, R., Lombard, M. 2014. Spatial Biodiversity Assessment and Spatial Management, including Marine Protected Areas. Final report for the Benguela Current Commission project BEH 09-01.

Holtzhausen, J.A., Kirchner, C.H., Voges, S.F. 2001. Observations on the linefish resources of Namibia, 1990-2000, with special reference to West Coast steenbras and silver kob. South African Journal of Marine Science, 23: 135-144.

Hutchings L., Verheye H.M., Huggett J.A., Demarcq H., Cloete R., Barlow R.G., Louw D., da Silva, A. 2006. Variability of plankton with reference to fish variability in the Benguela Current Large Marine Ecosystem – an overview. In: Benguela – predicting a large marine ecosystem. Shannon V., Hempel G., Malanotte-Rizzoli P., Moloney C., Woods, J. (eds). Elsevier, Amsterdam. Pages: 91-124.

Johnson, D.E., Barrio Froján, C., Turner, P.J., Weaver, P., Gunn, V., Dunn, D.C., Halpin, P., Bax, N.J., Dunstan, P.K., 2018. Reviewing the EBSA process: Improving on success. Marine Policy 88, 75-85.

Jury, M.R. 2017. Coastal upwelling at Cape Frio: Its structure and weakening. Continental Shelf Research, 132: 19-28.

Kirchner C., Japp D.W., Purves M.G., Wilkinson, S. (eds) 2011. Benguela Current Large Marine Ecosystem. Annual state of fish stocks report. Windhoek. 92 pp.

Kirkman, S.P., Yemane, D., Oosthuizen, W.H., Meÿer, M.A., Kotze, P.G.H., Skrypzeck, H., Vaz Velho, F., Underhill, L.G. 2012. Spatio-temporal shifts of the dynamic Cape fur seal population in southern Africa, based on aerial censuses (1972–2009). Marine Mammal Science, 29: 497–524.

Paterson J.R.B. 2007. The Kunene River Mouth: Managing a unique environment. MSc Thesis, Unversity of KwaZulu Natal, Pietermaritzburg, South Africa: 124 pp.

Ryan, P. G., Cooper, J., Stutterheim, C. J. 1984. Waders (Charadrii) and other coastal birds of the Skeleton Coast, South West Africa. Madoqua, 14: 71-78.

Sakko, A.L. 1998. The influence of the Benguela upwelling system on Namibia's marine biodiversity. Biodiversity & Conservation, 7: 419-433.

Tarr, J.G, Tarr., P.W. 1987. Seasonal abundance and the distribution of coastal birds on the northern Skeleton Coast, South West Africa/Namibia. Madoqua, 15: 63-72.

 

Other relevant website address or attached documents

Table 1: Summary of habitat types and threat status for Cape Fria. Data from Holness et al. (2014).

Threat Status

Habitat Type

Area (km2)

Area (%)

Endangered

Central Namib Outer Shelf

243.0

5.0

 

Kunene Outer Shelf

1342.5

27.8

Endangered Total

 

1585.5

32.9

Vulnerable

Kunene Shelf Edge

3.8

0.1

Vulnerable Total

 

3.8

0.1

Least Threatened

Central Namib Inner Shelf

829.4

17.2

 

Kunene Exposed Rocky Shore

0.3

0.0

 

Kunene Inner Shelf

1551.1

32.2

 

Kunene Inshore

275.4

5.7

 

Kunene Intermediate Sandy Beach

61.0

1.3

 

Kunene Mixed Shore

6.3

0.1

 

Kunene Reflective Sandy Beach

1.9

0.0

 

Hoanib Dissipative-Intermediate Sandy Beach

9.8

0.2

 

Hoanib Dissipative Sandy Beach

7.0

0.1

 

Hoanib Exposed Rocky Shore

0.4

0.0

 

Hoanib Inshore

445.4

9.2

 

Hoanib Intermediate Sandy Beach

38.4

0.8

 

Hoanib Mixed Shore

7.9

0.2

 

Hoanib Sheltered Rocky Shore

0.03

0.00

Least Threatened Total

 

3234.5

67.1

Grand Total

 

4823.8

100.0

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Assessment of the area against CBD EBSA Criteria

C1: Uniqueness or rarity Medium

Justification

Cape Fria is both unique and rare for several reasons. It falls within a transition zone between the temperate and sub-tropical bioregions, and includes a relatively rare upwelling cell, second in intensity only to the Lüderitz upwelling cell. Further, a systematic conservation planning assessment (that was undertaken as a gap analysis) identified Cape Fria as an important inshore focus area for place-based conservation of biodiversity features that were not yet sufficiently represented in the existing Namibian EBSA and marine protected area network (Holness et al., 2014). Portions of this focus area were always required to meet biodiversity conservation targets, and hence it can be considered to be “irreplaceable”. Finally, existing evidence indicates that the area may either seasonally or episodically contain almost the entire global population of Damara Tern, Sternula balaenarum, a Benguela System endemic species (Braby et al., 1992). The area appears to be an annual congregation area prior to the flock migrating northwards. It has been suggested that this is likely to be a congregation area linked to high food availability, i.e., a high-energy coastline with a presumably reliable food source that is available at night and within about 5 km of the shore.

 

C2: Special importance for life-history stages of species High

Justification

Cape Fria is an important site for Cape fur seals, which, although it was only relatively recently established as a breeding colony, supports an increasing seal population (Kirkman et al., 2012). This site also exhibits strong terrestrial links because the expanding seal colony supports an expanding population of the Endangered Lappet-faced Vulture, Torgos tracheliotos (Braby, pers. comm.). The Cape Fria EBSA is also an overwintering site for Palearctic waders, although at fairly low densities (Tarr & Tarr, 1987). Further, as noted previously, Cape Fria hosts almost the entire global population of Damara Tern either seasonally or episodically, in what seems to be an annual congregation area prior to the flock migrating northwards (Braby et al., 1992). It is likely that this is linked to high food availability at the site, i.e., a high-energy coastline with a presumably reliable food source that is available at night, and within about 5 km of the shore. Finally, Cape Fria is a transition zone between the cool, temperate southern areas that are influenced by the Benguela current, and a more sub-tropical climate to the north of Namibia (Tarr 1987), and thus may possibly be an important area for adaptation to climate change and range shifts. This is supported by the fact that the area constitutes the northern or southern limit for a number of fish species (Bianchi et al., 1999; Holtzhausen et al., 2001; Kirchner et al., 2011).

 

C3: Importance for threatened, endangered or declining species and/or habitats High

Justification

The Cape Fria EBSA contains two Endangered habitat types: Central Namib Outer Shelf and Kunene Outer Shelf, with the area being particularly important for the latter. In addition, a small portion of the Vulnerable Kunene Shelf Edge habitat type is found in this EBSA. As noted previously, the site is also important for the Vulnerable Damara Tern, Sternula balaenarum (Braby et al., 1992), and for Cape fur seals that seem to be generally declining in abundance at rookeries in southern Namibia but increasing here (Kirkman et al., 2014).

 

C4: Vulnerability, fragility, sensitivity, or slow recovery Data deficient

Justification

There is no information to guide ranking the EBSA on this criterion. It could possibly be ranked low because the conditions are unstable and unpredictable, preventing very vulnerable species from persisting (Sakko 1998). However, it could also be argued that the Cape Fria upwelling cell is vulnerable to impacts from climate change.

 

C5: Biological productivity High

Justification

There is an upwelling cell at Cape Fria that enhances local productivity (Sakko, 1998). Upwelling is year-round, but is intensified in winter and early spring (Hutchings et al., 2006; Jury, 2017). It is driven both by wind and bottom topography because the Namibian continental shelf is at its narrowest around Cape Fria (Sakko, 1998); further, the wind shadow and poleward currents also contribute to the phytoplankton blooms (Jury, 2017). This upwelling cell is second in intensity only to the Lüderitz upwelling cell, and the high productivity here that underpins the top predator foraging areas is at the heart of this site’s value as an EBSA.

 

C6: Biological diversity Medium

Justification

Shorebird and coastal seabird diversity and density are relatively low in the focus area (Ryan et al., 1984; Tarr & Tarr, 1987). However, the Cape Fria focus area may be an area of high sub-tidal and coastal biodiversity because it is at the transition between temperate and sub-tropical biogeographic regions, with communities comprising species at their southern and northern bioregional limits (Sakko 1998). It is possible that this is enhanced by high productivity from the Cape Fria upwelling cell, and the close proximity to the Walvis Ridge, which has high habitat heterogeneity. The speculated higher biodiversity in the area could be locally important because Namibia generally has low marine species richness (Sakko 1998). Local habitat heterogeneity is also high, with 17 habitats represented within the EBSA.

 

C7: Naturalness High

Justification

Cape Fria is a remote coastal area adjacent to the Skeleton Coast Park. The focus area is inaccessible to the public, with only limited tourism permitted in the area, and because of this, is currently near-pristine.

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