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Robberg July 2020 Scott Ramsay 18
Capenature
Animal Conservation

Introduction

Learn all about Animal Conservation on our Reserves.

Cape Mountain Zebra at Gamkaberg Nature Reserve

Mammals

The Western Cape supports 126 types (or taxa) of land-based mammals and 27 types of marine mammals. Habitat loss, degradation and fragmentation, as well as invasive alien species, are the most severe threats to the mammals of the province. Twenty-three of the 153 taxa are listed as Threatened in the South African Red Data Book. Three are Critically Endangered, i.e. on the verge of extinction. Seven are Endangered, 13 are Vulnerable and 10 are Near Threatened. Although not as rich in large mammal fauna as some of the other provinces, some very special taxa can be seen when visiting CapeNature reserves. Eight of the province’s mammals are found nowhere else in the world. One of these, the bontebok (Damaliscus pygargus pygargus), is an example of a conservation success story. These striking brown and white antelope are easily spotted when visiting De Hoop Nature Reserve. Other charismatic species to be found on our provincial reserves are the Cape mountain zebra (Equus zebra zebra) and the Critically Endangered riverine rabbit (Bunolagus monticularis).

Photo: Cape Mountain Zebra at Gamkaberg Nature Reserve 

Birds

Over 600 bird species have been recorded in the Western Cape Province. Almost half of are provincial residents, while the rest are either birds that migrate south during summer, pelagic species occurring off the shores of the province, exotic species that have escaped and established themselves in the wild, or vagrants. Of the 337 resident species, 28 are listed as threatened in the 2015 South African Red Data book of Birds. These include the Critically Endangered Damara tern (Sterna balaenarum), which breeds at De Mond Nature Reserve and a few other sites along the coastline. Then there are Endangered species such as the hottentot buttonquail (Turnix hottentottus), black harrier (Circus maurus) and Ludwig’s bustard (Neotis ludwigii). The Cape Floral Kingdom extends into the Eastern Cape, and so does the distribution of birds that are endemic to Fynbos, however the Western Cape supports most of the populations of these species. The only species which is truly endemic to this province is Agulhas Long-billed Lark (Certhilauda brevirostris), which is found on the Agulhas plains near Bredasdorp. The diversity of bird habitats (fynbos, karroid, forest, coastal, marine, wetlands, etc.), and the vast numbers of especially wetland and coastal birds, has led to the establishment of 23 Important Bird Areas within the province.

Photos: Blue Crane

Reptiles

Of the 149 reptile taxa in the Western Cape (excluding the marine turtles), 14% occur only in this province. Seven taxa are considered to be regionally threatened. Three of these are tortoises, including the Critically Endangered geometric tortoise (Psammobates geometricus). Two taxa are Endangered and four are Vulnerable. Many reptile species do not tolerate habitat transformation. There are still several undescribed species in the province which need conservation assessment.

Geometric tortoise Psammobates geometricus (Critically Endangered)

The geometric tortoise occurs only in the low-lying renosterveld shrublands of the Swartland, Upper Breede River Valley and Ceres Valley. Itis a flagship species for the conservation of the few remaining fragments of renosterveld in an area where wheat and wine farming, as well as urban development, have led to the destruction of more than 90% of the species’ habitat. CapeNature partners with the Southern African Tortoise Conservation Trust to monitor and protect the species and to secure additional habitat for it. This includes the innovative use of a detection dog to locate the well-camouflaged tortoises.

Photo: Geometric Tortoise

Amphibians

The Western Cape has an extremely rich and unique amphibian diversity. Of the 60 amphibian taxa in the Western Cape, 60% only occur in this province. Disturbingly, eight of these are threatened. Five species have been assessed as Critically Endangered are three as Endangered, while a further three species cannot be assessed because there is simply not enough known about them. CapeNature is involved in monitoring several threatened species, one of which is the Critically Endangered rough moss frog (Arthroleptella rugosa).

Photo: Rough Moss Frog

Freshwater Fish

There are 41 types of indigenous freshwater fish in the Western Cape. Thirty-three of these occur only in this province, and 22 are threatened. Species that are considered to be Critically Endangered are a new species of slender galaxias (Galaxias sp. nov. ‘slender’) and four species of redfin minnow: Barrydale redfin (Pseudobarbus burchelli), Krom River redfin (Pseudobarbus senticeps), Doring River redfin (P. ‘phlegethon Doring’) and Twee River redfin (Sedercypris erubescens). The primary threat to the indigenous fishes of the Western Cape is the presence of invasive alien species, followed by habitat degradation and destruction due to unsound land use practices and water over-abstraction and pollution.

Marine Fish

MARINE FISH

At least 807 marine fish taxa (including sharks) have been recorded in the waters of the Western Cape and 105 of these have an IUCN threat status. Most fish do not show site fidelity, but some special species occur in South African waters and nowhere else (endemics). There are three critically endangered teleost fish that are endemic to South Africa. The dageraad (Chrysoblephus laticeps), eightgill hagfish (Eptatretus octatrema) and seventyfour seabream (Polysteganus undulosus). One of the most iconic and important fish family in South Africa is the Sparidae family. This group of fish comprises of 35 genera and 112 species with 41 species occurring in South Africa. They can be found in various habitats including bays, brackish estuaries, coastal reefs and deep waters off the continental shelf. Many of the species are hermaphrodites and change sex as they mature. The larger species grow slowly and the adults are territorial with small home ranges, making them vulnerable to overfishing.

Puffadder shysharks (Haploblepharus edwardsii) and brown shysharks (Haploblepharus fuscus) (Endangered)

The puffadder and brown shyshark form part of the catshark family and are endemic to South Africa.

The common puffadder shark is found on or near the bottom in sandy or rocky habitats, from the intertidal zone to a depth of 130 m. It is a predator that feeds mainly on crustaceans, polychaete worms, and small bony fishes. The range of the puffadder shyshark is limited to the continental shelf along the coast of South Africa, from Langebaan Lagoon in Western Cape Province to the western shore of Algoa Bay.

The brown shyshark is found in shallow, coastal waters of South Africa from west of Cape Agulhas to KwaZulu-Natal. This benthic species is usually found over sandy or rocky bottoms. Unlike other shysharks, the brown shyshark has a plain brown colour, though some individuals have faint "saddle" markings or light or dark spots. When threatened, this shark curls into a circle with its tail over its eyes, which is the origin of the name "shyshark". It feeds on bony fishes and lobsters. The brown shyshark has a restricted distribution along the coast of South Africa, from the Western and Eastern Cape Provinces to southern KwaZulu-Natal Province. The range of this species overlaps with the puffadder shyshark in the southeastern Cape region. There, the brown shyshark tends to favor shallow inshore habitats, while the puffadder shyshark inhabits deeper offshore waters.

Both species have been assessed as endangered by the International Union for Conservation of Nature (IUCN), as their entire population is located within a limited area and could be affected by a local increase in fishing pressure or habitat degradation.

Invertebrates

Over 55000 invertebrate species have been described in South Africa. The invertebrate fauan of the Western Cape is equally rich, with 300 known types of butterflies, 965 arachnids, 84 dragonflies and damselflies, and 156 net-winged insects. Despite being under-represented in studies of African diversity, invertebrates are significant contributors to ecosystem processes such as primary production, nutrient recycling, predation, herbivory and competition. Only a few invertebrate groups in South Africa are understood well enough to allow for an assessment of their threat status. These include the butterflies (Lepidoptera, 32 of 300 taxa in the Western Cape threatened) and the dragonflies and damselflies (Odonata, seven of 78 Western Cape taxa threatened). Approximately 27% of bee species are endemic to the province and each of the 17 species of the wingless stag beetle (genus Colophon) of the Lucanidae is restricted to a single mountain peak in the Western Cape.

Photos: Goliath Beetle

Related Animals

Groenvlei Carp Project

The Invasive Fish Species Management Non Profit Company (IFSM) consists of a group of volunteers that approached CapeNature in 2018 to remove invasive carp from Groenvlei lake by means of fishing bows.

Monitoring the Great White Shark

The waters around Dyer Island are an important seasonal feeding ground for great white sharks. Researchers working through Dyer Island Conservation Trust have demonstrated a decrease in white shark sightings around the island since 2017. 

Possibly extinct Brenton blue butterfly

Of the two localities at which it is known to have occurred, the Brenton blue butterfly is now extinct at one (Nature’s Valley) and possibly extinct at the other (the Brenton Blue Butterfly Reserve near Knysna).


Conservation of Barrydale redfin

The tiny Critically Endangered Barrydale redfin, for example, is limited to just 40 km2 in the Tradouw catchment where it is threatened by water abstraction, pollution and alien fish.

Rough moss frog

The rough moss frog occurs at a single locality on the southern slopes of the Klein Swartberg Mountain. The main threats to this species are invasive alien plants and too-frequent fires.

Monitoring of the critically endangered Geometric tortoise

The geometric tortoise occurs only in the low-lying renosterveld shrublands of the Swartland, Upper Breede River Valley and Ceres Valley.

Bontebok conservation

The Greater De Hoop Conservation Area is the stronghold of bontebok conservation. Together, De Hoop Nature Reserve and the adjacent Overberg Test Range support almost half of all bontebok on protected areas.