References
- Chacon-Torres, A. & Rosas-Monge, C., 1998: Water quality characteristics of a high altitude oligotrophic Mexican lake. — Aquat. Ecosyst. Health Manage. 1: 237–243.
- Cottingham, K. L., Carpenter, S. R. & St. Amano, A. L., 1998: Responses of epilimnetic phytoplankton to experimental nutrient enrichment in three small seepage lakes. — J. Plankton Res. 20: 1889–1914.
- Dodds, W. K. & Priscu, J. C., 1988: An inexpensive device for sampling large volumes of lake water from discrete depths. — Freshwater Biol. 20: 113–116.
- Dodds, W. K. & Priscu, J. C., 1990: A comparison of methods for assessing nutrient deficiency in phytoplankton in a large oligotrophic lake. — Can. J. Fish. Aquat. Sci. 47: 2328–2338.
- Downing, J., Mcclain, M., Twilley, R., Melack, J., Elser, J., Rabalais, N., Lewis Jr., W., Turner, R., Corredor, J., Soto, D., Janez-Arancibia, A., Kopaska, J. & Howarth, R., 1999: The impact of accelerating land-use change on the N-cycle of tropical ecosystems: current conditions and projected changes. — Biogeochemistry 46: 109–148.
- Haberyan, K. A., Umaña V. G., Collado, C. & Horn, S. P., 1995: Observations on the plankton of some Costa Rican lakes. — Hydrobiologia 312: 75–85.
- Hecky, R. E., 2000: A biogeochemical comparison of Lakes Superior and Malawi and the limnological consequences of an endless summer. — Aquat. Ecosyst. Health Manage. 3: 23–33.
- Herrera, W., 1985: Clima de Costa Rica. — In: Gomez, L. D. (ed.): Vegetación y Clima de Costa Rica. Vol. 2. — EUNED, San José, 118 pp.
- Horn, S. P. & Haberyan, K. A., 1993: Physical and chemical properties of Costa Rican lakes. — Natl. Geogr. Res. Explor. 9: 86–103.
- Lewis, W. M., 1990: Comparisons of phytoplankton biomass in temperate and tropical lakes. — Limnol Oceanogr. 35: 1838–1845.
- Petersen, R. R. & Sytsma, M., 2000: Nitrogen and phosphorus limitation in Priest Lake, Idaho, USA. — Verh. Internat. Verein. Limnol. 27: 2938–2943.
- Strickland, J. D. H. & Parsons, T. R., 1972: A Practical Handbook of Seawater Analysis. 2nd Ed. — Fisheries Research Board of Canada, 310 pp.
- Umana V. G., 1997: Basic limnology of Lago Bonilla, a tropical lowland lake. — Rev. Biol. Trop. 45: 1429–1437.
- Von Sperling, E., 1997: The process of biomass formation as the key point in the restoration of tropical eutrophic lakes. — Hydrobiologia 342/343: 351–354.