Print version ISSN 1679-6225
Neotrop. ichthyol. vol.7 no.4 Porto Alegre 2009
The ichthyofauna of upper rio Capivari: defining conservation strategies based on the composition and distribution of fish species
Paulo dos Santos PompeuI; Liana Sisi dos ReisI; Cíntia Veloso GandiniI; Rafael Couto Rosa de SouzaI; Jana Menegassi del FaveroII
IDepartamento de Biologia, Universidade Federal de Lavras, Campus Universitário, 37200-000 Lavras, MG, Brazil. email@example.com
IIPrograma de Pós-Graduação em Oceanografia Biológica, Instituto Oceanográfico, Universidade de São Paulo. São Paulo, SP, Brazil
Although the rio Capivari basin is recognized as an area of great importance for the ichthyofauna, it lacks virtually every basic requirement for the definition of appropriate conservation strategies, since not even its species composition is known. The objective of this work is to determine the composition and distribution of fish species in the upper rio Capivari basin, relating them to the local physical features, and to evaluate the effectiveness of proposed conservations units, delimited based on areas of native vegetation remains, on the conservation of local ichthyofauna. During 2007, 50 different watercourses were sampled with gillnets, cast nets and kick nets. A total of 1308 individuals belonging to 41 species were captured. Degree of conservation, altitude and width were the parameters that best explained fish species richness. Considering the recently proposed boundaries for potential conservation units in the region only 15 or 20 out of 41 species would be found in the State Park and Environmental Protection Area respectively. In practice, the proposed conservation units would not be effective tools for fish conservation, since it would be located in mountainous areas of high altitude, of headwaters streams and where few species are found. In such context, the conservation of specific stretches of larger rivers is critical.
Key words: Conservation units, Altitudinal gradients, Rio Grande, Reserve design.
Embora o alto rio Capivari seja reconhecido como área de grande importância para a fauna de peixes, faltam praticamente todos os requisitos básicos para a definição de estratégias de conservação adequadas, já que nem mesmo sua composição em espécies é conhecida. O presente trabalho teve como objetivo geral determinar a composição e distribuição das espécies de peixes do alto rio Capivari e relacioná-las com as características físicas locais. Adicionalmente, avaliou-se a efetividade da implantação de unidades de conservação, que tiveram seus limites propostos com base na presença de remanescentes de vegetação nativa, para a conservação da ictiofauna local. Durante o ano de 2007 foram amostrados 50 diferentes cursos d'água na bacia com redes de emalhar, tarrafas e peneiras. Foram capturados 1308 indivíduos pertencentes a 41 espécies. O grau de conservação, a altitude e a largura foram os parâmetros que melhor explicaram a riqueza de espécies de peixes. Caso os limites de uma futura unidade de conservação fossem baseados nas manchas de vegetação remanescentes, apenas 15 ou 20 das 41espécies seriam encontradas na área do Parque Estadual ou da Área de Proteção Ambiental, respectivamente. Na prática, as áreas protegidas propostas não constituiriam ferramentas eficazes para a conservação de peixes, principalmente porque se situariam em áreas montanhosas, de grande altitude, abrigando apenas cabeceiras de rios, onde poucas espécies são encontradas. Dentro deste contexto, a conservação de trechos específicos de rios de maior porte é fundamental.
Throughout history, rivers have provided the foundation for socioeconomic development. Water is used for domestic, industrial, agricultural and power generation purposes; rivers provide navigation routes and fishing is a traditional food resource (Petts, 1989). As a consequence, an increasing number of rivers, streams, lakes and reservoirs have been exposed to degradation as a function of the growing impact of human activities (McAllister et al., 1997).
This picture is particularly noticeable in densely populated areas, where aquatic environments present poor quality as a result of receiving a considerable amount of domestic and industrial sewage as well as sediments and waste. Additionally, the urbanization process causes irreversible changes to the local drainage basin by increasing impermeable areas, reducing vegetation coverage, causing soil compaction, reducing storage areas, concentrating surface drainage and stimulating river straightening and channelization. These changes lead to a progressive increase in the precipitation fraction that rapidly goes into watercourses through superficial drainage (Chow et al., 1988), directly affecting the local geomorphology. Direct changes in watercourses also include removal of riparian vegetation, removal of trunks and other submerged substrata, elimination of adjacent flooding areas and artificial lining of riverbeds and riverbanks.
In a direct association with urban growth, rivers have been altered to a point where they lose their natural characteristics (Vieira & Cunha, 2001), many of which presenting today only a small fraction of their original biological diversity (Shepp & Cummins, 1997). Particularly noticeable is the loss of fish biodiversity and abundance that has been associated to changes in original lotic characteristics (Sale, 1985) or to disposal of domestic and industrial sewage (Alves & Pompeu, 2005; Pompeu et al., 2005).
There is a consensus among the scientific community that chances of long-term maintenance of biodiversity will increase significantly with the establishment of a conservation plan to address the issue on a regional scale or encompassing larger landscape units (Conservation International, 2000a), and protected areas are the cornerstone of most national biodiversity conservation strategies, including the Brazil (Mittermeier et al., 2005). In such context, the recognition of areas that maintain rich species diversity or priority areas for conservation constitutes a fundamental tool for protection of biodiversity (Allan & Flecker, 1993).
The rio Capivari basin has been recognized as one of critical biological importance for conservation of the ichthyofauna in Minas Gerais State (Drummond et al., 2005) as it is an important lotic remainder in the upper rio Grande region and its watercourses boast excellent water quality. Additionally, the rio Capivari basin drains the region of Luminárias, São Tomé das Letras and Carrancas as well as part of the region that houses the Serra da Mantiqueira mountain range, both recognized by the same study for their outstanding and special biological importance. The importance of the region was also recognized by an assessment workshop addressing Priority Actions for Conservation of Biodiversity in the Atlantic Forest and Campos Sulinos biomes (Conservation International, 2000b).
Although the rio Capivari basin is recognized as an area of great importance for the ichthyofauna, it lacks virtually every basic requirement for the definition of appropriate conservation strategies, since not even its species composition is known.
The overall objective of this work is to determine the composition and distribution of fish species in the upper rio Capivari basin, relating them to the local physical features, and to evaluate the effectiveness of an eventual state park, that have been proposed based on areas of native vegetation remnants (Zambaldi et al., in press) on the conservation of local ichthyofauna.
Material and Methods
The rio Grande has a drainage basin in Minas Gerais State with an approximate area of 86,800 km2 (CETEC, 1983). It extends 1,930 km, with an average slope of 0.53 m km-1. Its main tributaries include the rivers Airuoca, Capivari, São João and Carmo, on the left bank, and the rivers Jacaré, das Mortes, Santana, Uberaba and Pouso Alegre, on the right bank. In Minas Gerais, rio Grande is dammed along virtually its entire course, with the hydroelectric power plants of Funil, Itutinga and Camargos the ones lying upstream.
Situated among the Funil and Itutinga reservoirs, the rio Capivari is one of the main tributary on the left bank of rio Grande in Minas Gerais State. Its upper portion drains the regions of Carrancas and Luminárias and has been found increasingly attractive to tourism as it boasts a large number of waterfalls, good water quality and a generalized high level of landscape preservation.
The region is constituted by flat and undulated surfaces, with the ascent of Complexo Serra da Bocaina mountain range deserving special attention, with altitudes reaching between 1,100 and 1,250 m. The high-altitude tropical climate is predominant locally, with average annual temperatures ranging between 19ºC and 21ºC and average annual rainfall between 1,200 and 1,500 mm (Queiroz et al., 1980). The dominant vegetal formation is the Cerrado (savanna like vegetation), and rocky landscapes predominate on mountain range tops. Riparian vegetation is also present along the watercourses, and large clusters of mesophyllous forest are present on some steeper hillsides.
The studied area is known as ‘Alto Capivari' and comprises the entire drainage basin of rio Capivari, upstream from (and including) its confluence with its main tributary, rio Ingaí. It includes the area previously selected for conservation unit implementation, with a state park in the core area and a surrounding environmental protection area (EPA) as a buffer zone (Fig. 1).
During 2007, 50 different watercourses were sampled once in upper rio Capivari basin (Fig. 1; Table 1), during April, May, October or November. Fish were caught with gillnets, cast nets (3 cm stretch measure mesh) and kick nets (mesh size of 1 mm). Gillnets 10 meters long, with 3 to 10 cm mesh (stretch measure), were set in the water column for 14 h overnight, in sampling stations with at least 1.5 meters depth. Kick nets were employed in near-shore aquatic macrophytes (both shorelines) and in riffles, and cast nets were used in habitats too deep to wade. The two latter methods were employed during one to three hours. Stretches of 50 to 100 meters were surveyed, depending on depth and water flow.
All samples were separated according to sampling point, stored in plastic bags and immediately fixed in 10% formalin and preserved in 70% alcohol. In the laboratory, the fish collected in each sample were identified down to the lowest possible taxonomic level, measured (standard length - SL in mm) and weighed (1 g precision). Voucher specimens were deposited in the Ichthyological Collection of Nupelia (NUP voucher numbers from 8551 to 8553 and 8574 to 8611).
In each sampled station it was measured the average width, maximum depth, altitude, pH, temperature and dissolved oxygen using digital oxymeter YSI-55. Simultaneously, a quick assessment protocol was performed (Bain & Stevenson, 1999; Barbour et al., 1999), evaluating nine physical parameters: available cover; embeddedness; velocity/depth regime; sediment deposition; channel flow status; channel alteration; bank stability; vegetative protection and riparian vegetative zone width. Each of these parameters was assessed on a scale from zero to ten, and for each sampled station considered optimal (> 8), intermediary (8 > x > 4) or poor (< 4). An overall score was also attributed to each point, considering the summatory of the nine parameters scores, divided by 0.9, and this was considered as estimation of the stream reach conservation status. Additionally, the order of each sampled watercourse was also determined (Strahler, 1964), based on 1:100.000 maps.
Species accumulation curve based on the addition of new sampling points, and the estimators of species richness Jackknife 1 and Chao 1 calculated with the software EstimateS (Colwell, 1997) were used to access the representativeness of the fish diversity sampling in the entire study region. The relationship between the streams evaluated variables (order, width, depth, altitude, and conservation) and the fish richness was tested through multiple regression. Canonical Correspondence Analysis (CCA) was used to evaluate the relationship between the relative abundance of fish species (number of sampled fish by species divided by the total abundance in each location) and the variables that significantly explained the fish richness and the parameters pH, dissolved oxygen and temperature. This analysis was carried out using the software Canoco for Windows 4.0; only species with at least five captured individuals were included.
The sampling points were situated between 877 and 1,214 meters of altitude, and were in the first to sixth stream order range, presenting width of 1 to 20 meters and maximum depth of 0.5 to 3 meters. Most streams presented high levels of dissolved oxygen (> 5 ppm), slightly basic pH, water temperature between 15ºC to 20ºC, and a very good state of conservation (Table 1). The main impacts that were observed were related to sediment deposition and reduced substrata for the fauna (Fig. 2).
A total of 1,308 individuals of 41 species were captured (Table 2). Two species are considered allochtonous to the study area. Despite the stabilization of the species accumulation curve (Fig. 3), richness estimators Jackknife 1 and Chao 1 point to the possible occurrence of a much larger number of species: 55.7 (SD = 5.29) and 50.5 (SD = 5.92) respectively.
Degree of conservation, altitude and width were the parameters that best explained species richness in the sampled watercourses (p < 0.001; r2 = 0.41). Given the negative relationship between altitude and width, the influence of these factors may be related to the altitudinal distribution of speciesin the region. Only three species (Pareiorhaphis sp., Trichomycterus brasiliensis and Astyanax aff. scabripinnis) occurred in altitudes above 1,070 meters while only eight occurred above 1,020 meters (Fig. 4).
The CCA analysis also revealed a significant relationship between the most abundant fish species and habitat variables (p = 0.002). The two axes in CCA accounted for 62.7% of the variation in species abundance and habitat variables (Fig. 5; Table 3). CCA 1 accounted for 42.6% of the variance and was determined by altitude, conservation status and river width, smaller watercourses in higher altitudes were found to be in better conservation state. In the second axis dissolved oxygen and temperature predominated but their explained variances were low (20.1%). Trichomycterus spp., A. aff. scabripinnis and Pareiorhina carrancas, for instance, can be regarded as being typical of narrower, higher and well-preserved environments, while Brycon nattereri, Salminus hilarii and Leporinus paranensis are found in larger and well-oxygenated rivers.
Considering the recently proposed boundaries for potential conservation units in the region (Fig. 1), only 14 or 22 out of 41 species would be found in the State Park and Environmental Protection Area (EPA), respectively.
This study revealed a considerable increase in the number of known species in the drainage basin of upper rio Grande. An amount of 39 species were known for the rio Grande (CEMIG, 2000), and 18 species for the Itutinga reservoir (Alves et al., 1998). With the addition of another 41 species from this study, the Minas Gerais portion of the basin has now 72 recorded species. If we include the tributaries of rio Grande draining the São Paulo State (Castro et al., 2004), the species richness reaches at least 105 species. We should note that studies are yet scarce on smaller watercourses of the basin, especially in the Minas Gerais portion, suggesting that richness is possibly much higher.
Although only two exotic species were recorded, this number is compatible with the proportion of these species in upper rio Paraná basin in Minas Gerais, which is about 10% (Alves et al., 2007). Originally from South America and Africa respectively, Poecilia reticulata and Tilapia rendalli are widely disseminated and found in virtually every drainage basin of Minas Gerais State (Alves et al., 2007).
The progressive increase in number of fish species from headwater to downstream is well known (Horwitz, 1978), and richness has been predicted by altitude and stream order measurements (Platts, 1979; Beecher et al., 1988). Species addition has been related to the gradual increasing on living space, habitat diversity and environmental stability downstream (Horwitz, 1978). In the rio Capivari basin, the altitudinal effect on fish richness was evident, and creates a challenger concerning the fish fauna conservation. Larger rivers, which shelter more complex fish communities, are located in low altitude areas which are less preserved.
The consequences of this pattern can be illustrated by the pirapitinga (Brycon nattereri) distribution. Among the captured species, it is the only one considered endangered (Machado et al., 2005). The upper Capivari region has been used as a source of this species in order for the development of breeding stock in farming stations. If we consider the boundaries of the proposed conservation unit, two sampled occurrence points of this species are left out (stations 24 and 29) while the other two lie in bordering areas of the park (stations 47 and 17). This occurrence pattern can be related to its environmental preferences: larger and well-oxygenated rivers. The conservation status of the species could be also explained by this aspect, since well preserved rivers are mostly small sized ones, and located in the headwaters.
With recognition of the global biodiversity crisis in the 1980's (Wilson, 1988), many efforts were initiated to prioritize areas for conservation action on the basis of total species richness or the number of endemic species. This approach, analysis of geographic patterns assuming a particular taxonomic authority list to be representative, leads investigators to focus attention on species' distributions without concern for geographic variation, systematic problems, or species limits (Peterson & Navarro-Sigüenza, 1999). In addition, identification of conservation areas ideally requires exhaustive knowledge of species and ecosystem diversity and distribution, but detailed inventories in the field are severely constrained by limited resources and time (Menon et al., 2001). For this reason, the analysis of threats to biodiversity is frequently based on threatened vegetation categories, presenting high integrity areas susceptible to deforestation and not protected by law restrictions, have been the most selected areas for conservation.
Freshwater fish are probably the world's most threatened group of vertebrates after amphibians (Bruton, 1995), and in North America the extinction rate of freshwater animals is estimated to be three times higher than that of marine mammals and almost five times higher than that of terrestrial animals (Ricciardi et al., 1999). Disturbances are to a large extent related to engineering works, domestic and industrial sewage, land use practices as well as fishing and storage (Maitland, 1995), while habitat destruction and introduction of exotic species are cited as the primary causes of extinction of several fish species in North America (Miller et al., 1989). Despite the consequences of this scenario, the preservation of fish communities has been receiving less attention than other vertebrates (Maitland, 1985).
The creation of protected areas is potentially a partial solution, as it could prevent the destruction of habitats and regulate predatory fishing practices. However few of them have been created specifically for aquatic environments. Examples worldwide include alluvial floodplains, deltas and lakes (Saunders et al., 2002). In Brazil, the best known example is the environmental protection area of upper rio Paraná (526,000 km2), capable of embracing most local fish species (Agostinho et al., 2005).
An urgent need to create more conservation units specifically intended for fish protection has been identified by several authors (Keith, 2000; Saunders et al., 2002). In practice, studies indicate that the central areas of national parks have been ineffective tools for fish conservation, because most of them are located in mountainous areas of high altitude, where there are only headwaters streams and threatened species are not found (Keith, 2000). These areas are typically selected for conservation based on vegetation remains.
In Southeastern Brazil, where most threats to fish fauna are concentrated, conservation units also follow the same pattern, as they typically comprise hilltop areas and therefore exclude a large number of species that are not present in this type of environment. Within the boundaries of Serra do Cipó National Park, for instance, only 16 species are found out of 48 species inventoried in the region (Vieira et al., 2005), while in rio Cipó only 10 out of 72 species recorded in that River (Alves & Pompeu, 2005) were captured. Low species richness was also found in Serra do Mar State Park (Gomiero & Fraga, 2006) and in the das Neblinas Park (Serra et al., 2007).
Same pattern would be observed considering the original area proposed for the State Park in the Capivari basin region, where only 37% of the regional fish richness would be found. However, these areas play a partial role in the maintenance of aquatic biodiversity environments, since the maintenance of water quality in small headwater streams is a key point to secure water quality in larger rivers.
Seeing the great number of fish species registered, including endangered ones, state that as has been established by the atlas of priority areas in Minas Gerais State (Drummond, et al., 2005), we can affirm that the upper Capivari region remains key to the conservation of the ichthyofauna of upper rio Grande. However, if the establishment of conservation units in the region will be based only on the presence of vegetation remains, a small fraction of the local fish community would be protected. In such context, the conservation of other fluvial landscapes, such as specific stretches of rivers, floodplains, etc, is critical, as well as the actual implementation of the diverse regulations, public policies, and mechanisms for river protection and restoration.
We are grateful to Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) for the financial support, the anonymous referees for the suggestion to the manuscript, Ludmilla Zambald for the map elaboration and the Ecology Sector of Federal University of Lavras for the logistics support.
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Accepted September 24, 2009
Published December 18, 2009