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Status and Distribution of Mangroves in Mozambique

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Status and Distribution of Mangroves in Mozambique South Afflam Joum;J1 of BO/;Jny 2001. 67 393-398 Copynghl tJ NISC Ply LId Pnnred in South Alnel'! - All fights reserved SOUTH AFRICAN JOU RN A1 OF BOTANY ISSN 0254-6299 M inireview Status and distribution of mangroves in Mozambique FMA Barbosaa- , CC Cuambe2 and SO 8andeira1 , Department of Biological Sciences, Eduardo Mondlane University, PO Box 257, Maputo, Mozambique , Forest Inventory Unit, Ministry of Agriculture and Rural Development, PO Box 1406, Maputo, Mozambique ". Corresponding author, e-mail: [email protected] Received 9 March 2001 , accepted in revised form 5 May 2001 The status of mangrove forests in Mozambique is pre­ Potential threats are oil pollution, uncontrolled coastal sented. Mangroves in Mozambique cover an area of migration and industrial development along the coast. approximately 396 080 hectares and occur mostly in The rate of mangrove deforestation is estimated as sheltered shorelines and river estuaries. The highest 1 821 hectares year\ and is highest in Maputo and concentrations of mangroves occur in central Beira. Conservation and management of mangroves in Mozambique, in the deltas and estuaries of large rivers. Mozambique falls under the Forests and Land There are nine mangrove species in Mozambique. The Legislation Act, which envisages community participa­ major use is in building and as firewood. Major threats tion in the protection of natural resources. Proposals to mangroves include over exploitation for firewood and are still under way for a national mangrove management clearing of mangroves for solar salt production. plan, Introduction Study area Mangroves are defined as characteristic littoral plant forma­ Mozambique is located on the eastern coast of Africa tion of tropical and subtropical sheltered coastlines (Hughes between latitudes 10020'S and 26°50'S. The cl imate is and Hughes 1992). Th ey have been described as 'coastal essentially tropical, with a rather sub-tropical climate in the woodlands', 'tidal lorests' and 'mangrove lorests' (Berjak et south. Two main seasons can be distinguished: A warm ai, 1982, Saenger et al. 1983). In Mozambique mangroves rainy season from October to March and a cooler dry sea­ occur in protected shorelines, deltas and estuaries distrib­ son lrom April to October. The average annual rainfall in the uted all along the coastline. They are important coastal coastal areas is around 1 173mm - data provided by the ecosystems providing ecological, economical and environ­ National Institute lor Meteorology (1998- 2000). The 2 770km mental benefits to the peopl e oil Mozambique. Mozam bi can coastl ine can be divided into three main Current studies on Mozambican mangroves can be divid­ regions; the sandy coastline in the south, estuarine in the ed into two major groups . Studies investigatinl the biological central region, and coraline with coral limestone in the north­ and physical aspects and studies concerning socio-econom­ ern reg ion of the country. Mangroves occur mostly in the ics . Research on biological and physical aspects include: central estuari ne region. In this study, the main areas vis ited Taxonomy, distribution, fauna and flora associations and bio­ were Maputo Bay and Inhaca Island in the southern reg ion; physical requirements (e .g. Cuambe 2000, Vilanculos and Beira, Zambezi Delta and Qu elimane in the ce ntral reg ion Marquez 2000, Kalk 1995, Saket and Matusse 1994, Hatton and Lumbo, Mussoril, Nacala, Pemba, Ibo and Mecufi in the and Couto 1992, Hughes and Hughes 1992) . Socia-eco­ northern region. nomic studies cover demographic profiles as well as source and destination of mangrove products, mainly firewood and Material and Methods building poles (Chande 2000, Hatton and Massinga 1994, Sitae et al. 1994). Th is paper is chiefly a review work on the distribution , uses The objective 01 this paper is to outline the current knowl­ and threats on mangroves, and is based on published and edge on th e mangroves of Mozambique, in terms of dis tri­ technical reports produced in Mozambique. Data concerni ng bution, uses and threats. species diversity and identification of plants we re obtained larg ely from the herbarium voucher specimens at Eduardo Mondlane University and the Herbarium 01 the National 394 Barbosa , Cuambe and 8andelra Institute for Agronomic Research. The species diversity and populnea (L.) Soland. ex Correa. The transition zone comparison between regions was based large ly on site (between the mangroves and the ter restrial vegetation) is observation and literature . Site observation were conducted occupied by grasses and herbs such as Chenolea diffusa during seve ra l visits to the study sites, carried out during the Thunb. , Salicornia perrieri A. Chev., Suaeda maritima past eight years. Dumont, Paspalum dislichum L. , Sporobolus virginicus (L.) Kunth, Arthrocnemum sp. The herb Sesuvium portulacas­ Results trum L occurs in saline areas (salt des erts) and is occasion· aUy haNested as a vegetable. Mangrove habitats and distribution Pemphis acidula was only found in northern Mozambique (e.g. Mec"fi). This species occurs close to the terrestrial Mangroves occur along most of the Mozambican coast vegetation in areas subjected to extreme high tides. (Figure 1) . A total of 396 080ha of mangroves occur in the Sonneratia alba was on ly recorded from Incomati River country (Saket and Matusse 1994). The northern reg ion, (25°40'48"S, 32°39'36" E) northwards. This is a very com­ located between the River Ruvuma (10' 30'S, 40730"E) mon species in northern Mozambique where it thrives and Angoche (16" 12'36"S, 39"54'E), has numerous istands together with seagrass species in upper coraline intertidal (mainly Ouinmbas archipelago) th at provide protection to areas. All nine mangrove species occur in parts of northern mangroves and coral reefs. Here, the topography is highly Mozambique. Figure 2 shows a schematic diagram of man~ indented, the coastal plain is narrow, the rive rs are non· tidal grove zonation in central Mozambique. The seawa rd side is and the mangrove forests are mostly confined to the vicini­ occupied by Sonneratia alba. This is fo llowed by tall ties of the river mouths (Hughes and Hughes 1992). Rivers Avicennia then Ceriops-Rhizaphora-Bruguera communi· such as Megaruma and Montepuez are seasonal. The north­ ties. Avicennia ex hibit double zonation, growing as tall trees ern coast has we ll developed creek mangroves in Lumbo , on the seaward side and as scrub vegetation on the land~ Mec"fi, Ibo Island and the mainland areas north of Pemba ward side. The diversity of mangroves decreases south~ City (Whittington et al. 1997, Saket and Matusse 1994, ward. Semesi (1998) pOinted out that Heritiera littoralis, Hughes and Hughes 1992). Luminilzera racemosa and Xylocarpus granatum decline in The cen tral region , located between Angoche abundance in the vicinity of lnhambane Province. (16"12'36"S, 39' 54'E) and the Save River (20"52'12"S, 35 Cl 30E) has extensive and well established mangroves. Mangrove uses This is because of the alluvium and freshwater discharge that is received from 18 rivers flowing to the Indian Ocean . Mangroves are utilised by the people of Mozambique fo r The estuaries of the big rivers such as the Zambezl , building materials, firewood , fen ci ng, fish traps and for m ed ic~ Pungue, Buzi and Save are all in this central region. The inal purposes (Table 1). Ecologically mangroves play an mangrove of the Zambezi delta extends inland approximate* important role as nursery and feeding grounds for many Iy 50km . This mangrove is continuous from areas in the important commercial fish and crustacean species. south to Ouelimane (17"46'48"S, 36"54 'E) covering almost Mangrove deforestation is a serious problem in urban cen­ 180km of coastline. This mangrove is one of the single* tres such as Maputo and Beira . In Incomati Benguelene largest mangrove forests in Africa and represents close to Island mangrove poles are harvested at an annual rate of 50% (185 757ha) of Mozambican mangrove. 9 234 metric tones/year (Sitoe et al. 1991 ). The southern region , from the Save River (20"52'12"S, 35 ' 30'E) southward to Ponta de Duro (26°30'S, 32"24'36"E) Threats to mangroves in Mozambique on the Mozambique/South Africa border, has extensive man ~ groves in the Morrumbene Estuary, Inhambane bay, Maputo Major threats to the mangroves in Mozambique include: (i) bay and Inhaca Island. Maputo bay with its four main rivers uncontrolled exploitation for firewood, ch arcoal and poles; flowing into the bay, is one of the major mangrove areas in (ii) clearance of mangroves for agricu lture (mainly for rice southern Mozambique . At Inhaca, mangrove covers approx~ fields) and salt production; (iii) pollution and (iv) decreased imately 50% of the entire island coastline constituting one of flow of freshwater to mangroves caused by construction of the largest vegetation types. dams (Saket and Matusse 1994, Doddema 1997, Doddema and Manjate 2000). In addition, the uncontrolled influx of Diversity people from the inte rior regions to the coast has resulted in increased exploitation of mangroves (Saket and Matusse There are nine species of mangrove trees in Mozambique. 1994). Change in mangrove area per province between The dominant species are Avicennia marina (Forssk.) 197.2 and 1990 in shown is Table 2. Vierh. , Bruguiera gymnorrhiza (L.) Lam., Ceriops tagal (Per.) Crude oil and heavy metals have also affected man~ C.B. Robinson , Rhizophora mucronata Lam . and Sonneratia groves. FAO/UNEP(1982) mentioned a total of 14 minor and alba Smith . Others are Heritiera !illaralis Aiton , Lumnitzera two major crude oil spills in the Mapu to harbour which affect­ racemosa Willd., Xylocarpus granatum Koenig and Pemphis ed mangroves. In 1992, a heavy fuet oil spill apparently acidula Forst The fern mangrove, Acrostichum aureum L., is affected part of the Macaneta peninsula including man­ also common.
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