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Brazilian Journal of Microbiology

versão impressa ISSN 1517-8382versão On-line ISSN 1678-4405

Braz. J. Microbiol. v.36 n.4 São Paulo out./dez. 2005

http://dx.doi.org/10.1590/S1517-83822005000400005 

ENVIRONMENTAL AND SOIL MICROBIOLOGY

 

Yeasts isolated from sand and sea water in beaches of Olinda, Pernambuco state, Brazil

 

Leveduras isoladas do solo e da água do mar das praias de Bairro Novo e Casa Caiada, Olinda, Pernambuco, Brasil

 

 

Silvia Tereza Azedo LoureiroI; Maria Auxiliadora de Queiroz CavalcantiI*; Rejane Pereira NevesI; José Zanon de Oliveira PassavanteII

IDepartamento de Micologia, Centro de Ciências Biológicas, Universidade Federal de Pernambuco, PE, Brasil
IIDepartamento de Oceanografia, Universidade Federal de Pernambuco, PE, Brasil

 

 


ABSTRACT

The aim of this work was to isolate and identify yeasts from sand and sea water collected in two beaches of Olinda, Pernambuco state, Brazil. Thirty two samples of both sand and water in both beaches were obtained in the dry (December 2000 and February 2001) and rainy (June and July 2001) seasons. Two hundred and ninety two strains of yeast were obtained, and they belonged to four genera and 31 species. Candida was the most prevalent genus. Candida catenulata, C. fenica, C. sake, Brettanomyces bruxelenses and Rhodotorula mucilaginosa were the most commonly found species in both beaches Bairro Novo and Casa Caiada.

Key words: yeast, sand, water, beaches


RESUMO

Com o objetivo de isolar e identificar leveduras do solo e água do mar das praias de Bairro Novo e Casa Caiada, Olinda, Pernambuco, Brasil, foram coletadas 32 amostras de solo e água em ambas as praias durante o período seco (dezembro/2000 e fevereiro/2001) e período chuvoso (junho e julho/2001). Foram obtidas 292 amostras de leveduras, distribuídas em quatro gêneros e 31 espécies. Candida apresentou maior número de espécies. Candida catenulata, C. fenica, C. sake, Brettanomyces bruxellensis e Rhodotorula mucilaginosa foram as espécies mais comuns em ambas as praias Bairro Novo e Casa Caiada.

Palavras-chave: leveduras, solo, água, praias


 

 

INTRODUCTION

There is a great interest on increasing the knowledge regarding fungi in marine ecosystems, considering the small number of species known in this environment in Brazil, a country with a large coastal area.

Most of the studies referring to the isolation of yeasts from estuary waters and marine areas have been done in Europe and North America and only a few in South American countries like Chile and Brazil (5,7,25,26). In South Florida marine waters, highly polluted by domestic wastes, species of Candida, Trichosporon, Torulopsis and Rhodotorula were detected (13,22). These last two species are usually observed in marine environments (1,23) and, in the coastal region of Florida, Rhodotorula, Candida and Debaryomyces are the most commonly found species (2).

In Brazil, studies about yeasts isolated from sea water began in Florianópolis (11) and later in Recife (27) and Rio de Janeiro (14,15,16). Studies in São Paulo have shown that species of Candida can be used as indicators of pollution in marine estuaries (24). The aim of this work was to isolate and identify yeasts from sand and sea water in two beaches of Olinda, Pernambuco State, Brazil.

 

MATERIALS AND METHODS

Collection area - The Bairro Novo Beach, located in Olinda, Pernambuco State, Brazil, is approximately 2 km long, and has costal protection against erosion caused by sea invasion. This protection comprises nearly 36 perpendicular menmade reefs of 50 m, separated 50 m from each other. Besides marine erosion, many environmental problems are found in this beach, including domestic wastes and solid residues going into the sea, making the water inappropriate for bathing and water sports (6).

Casa Caiada is an urban beach, also located in Olinda, Pernambuco State, Brazil, and has approximately 4.5 Km of extension. This beach presents calm waters and some menmade reefs, being used for bathing, soccer practice and water sports (windsurf, swimming, sailing, and others), as well as for fishing and mollusk capture. The main environmental problems found there are precipitation, disposal of domestic wastes and solid residues.

Physical chemical and climatic parameters

The pH and the temperature of sand and sea water were determined using a digital pHmeter and a digital thermometer (Hanna), respectively. Pluviometric data from the city of Olinda were provided by the Empresa Pernambucana de Pesquisa Agropecuária (IPA) and by the Secretaria de Recursos Hídricos de Pernambuco (SRH). Colorimetric water analysis was provided by the Companhia Pernambucana de Controle de Poluição Ambiental e da Administração dos Recursos Hídricos (CPRH), who also informed the most probable number (NMP) of fecal coliform bacteria and the classification of the sea water according to regulations of CONAMA, Brazil. The climate in Olinda is hot and humid, with spring and winter rains distributed from March to August. By the time of this study, the lowest temperature in the coldest month was in 18ºC.

Sampling

Samples of sand and sea water in both beaches were obtained in the dry (December 2000 and February 2001) and rainy (June and July 2001) seasons. Thirty two samples were obtained from sand and thirty two from sea water, in low water and sysygy tide, based on tide tables of Recife Harbor, Pernambuco State (8). Water salinity was determined in a manual refractometer (Atago). Sand was collected with a garden shovel, in the region of medium seashore, at 1 m from the tide line, at the surface and also 20 cm deep. The samples were kept in plastic bags. Sea water was collected at the surface and at 1 m deep, using sterilized glass tubes. All samples were maintained at room temperature and transferred to the laboratory, in the Department of Mycology of Universidade Federal de Pernambuco, for immediate testing.

Cultures isolation, purification and identification

From each sample, a suspension of 50 g of sand in 90 mL of sterilized destilled water was prepared and 0.5 mL of this suspension were placed in Petri dishes in triplicate containing Sabouraud Dextrose Agar added of Yeast Extract and Cloranfenicol (18,26).

For isolation of fungi, 0.5 mL of sea water were placed on the surface of the same medium, in Petri dishes, which were prepared in triplicate and maintained at room temperature (28ºC ± 1ºC). The colonies were transferred to glass tubes containing Sabouraud Dextrose Agar and Yeast Extract, and submitted to macroscopic, microscopic and physiological observations (4,17,19).

Frequency of the yeasts species

The frequency of each yeast species was calculated according to Dajoz (10), with modifications, using the formula: Fo = Ta.100/TA, where Ta = number of samples in which the taxon occurred and TA = total number of samples. According to this formula, the frequencies of the species were classified as: < 10% = rare; 10 £ 25% = low; 25 < 35% = frequent; 35 < 50% = abundant, and > 50% = very abundant.

 

RESULTS AND DISCUSSION

Hydrologic parametrs, pH, temperature and salinity of sand and sea water

The water temperature in both beaches varied from 24.3ºC in December to 29.4ºC in February. On the most rainy month (July) the water temperature was 25.3ºC minimum and 28.2ºC maximum. The sand temperature in the dry season varied from 25.7ºC in December to 29.4ºC in February, and in July varied from 24.4ºC to 28.8ºC. The pH of all samples was slightly alkaline, ranging from 7.6 to 8.2. In Bairro Novo Beach the salinity in water and sand varied from 20‰ in the rainy season to 40 ‰ in the dry season, while in Casa Caiada Beach varied from 24‰ to 39 ‰ in the same seasons.

Isolation and identification of yeasts

Thirty one species of yeasts were isolated, and nineteen belonged to the genus Candida. In the Bairro Novo Beach, 15 species were isolated, belonging mostly to Candida (twelve), Rhodotorula (two) and Brettanomyces (one) genera. In the Casa Caiada Beach, 21 species were identified: Candida was also the most common genus (10 species), followed by Trichosporon, Rhodotorula and Brettanomyces, respectively with five, three and three species (Tables 1 and 2).

Candida catenulate, C. fennica, C. sake, Brettanomyces bruxelensis and Rhodotorula mucilaginosa were the most commonly found species in both beaches. According to Fell and van Uden, 1963, species of Candida were dominant in marine environments in Florida (13). Five species of Trichosporon were isolated from sand at the Casa Caiada Beach. Paula et al., 1983, referred the low adaptation of Trichosporon to sea water in "Baixada Santista", São Paulo State (24). Two studies reported that Rhodotorula species occur in marine waters polluted by domestic wastes (15,22). In our study, Brettanomyces was represented by three species. This genus was also frequently isolated from beach sand in Chile (25). It is possible that the yeasts found in the beaches of Bairro Novo and Casa Caiada have been brought not only by leaching but also by pluvial water and domestic wastes released along the beaches.

Pinto et al (26) referred that the rain precipitation affects significantly the frequency of fungi in sea water and sand, because, after raining the number of fungi is higher than during the dry season. In Olinda, the rain precipitation was 260.9 mm in June and 206.3 mm in July, and the amount of yeasts isolated during the rainy season was higher than that found in the dry period, when 180.5 mm and 43.25 mm of precipitation were registered in December and February, respectively.

Populations of yeasts in coastal waters are formed by various genera such as Candida, Trichosporon, Rhodotorula, Cryptococcus, Debaryomyces and Pichia (22,23,27). The first three were isolated from Bairro Novo e Casa Caiada beaches. Candida parapsilosis detected in this study is more common in human tissues, animal excrements, food products and drinks (20). Only one sample of C. albicans was isolated in Casa Caiada Beach, during the dry season, in low tide, and temperature of 29.4ºC. Anderson (3) mentioned that temperature affects growth of some Candida species isolated from marine environments, including C. albicans (9,13,21).

Brettanomyces bruxellensis and C. fennica presented the highest numbers of colony forming units in the beaches of Bairro Novo and Casa Caiada, 58 and 65 CFU/g, respectively (Table 3).

 

 

Yeasts frequency

Brettanomyces bruxellensis presented the highest frequency (43.75%), and was abundant in both beaches Candida catenulata, C. fennica and Rhodotorula mucilaginosa represented 18.75% of the isolations. C. melibiosica, C. parapsilosis, C. rhagri, C. rugopelliculosa, C. sake and Trichosporon dulcitum were considered species of low frequency (12.75%) and the remaining species presented rare frequency (6.25%) (Fig. 1). Brettanomyces bruxellensis was abundant in the sand of both beaches. The diversity of yeasts in Bairro Novo and Casa Caiada beaches is represented by species of Candida, Brettanomyces, Rhodotorula and Trichosporon.

 

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Submitted: November 19, 2004; Returned to authors for corrections: February 15, 2005; Approved: November 13, 2005

 

 

* Corresponding Author. Mailing address: Av. Boa Viagem, 3376, Boa Viagem, 51020-001, Recife, PE, Brasil. E-mail: xiliamac@terra.com.br

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