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BIOTOPE IN NATURE: This biotope represents a small, isolated pool in a dry, unnamed seasonal stream near Palma Beach, Parrita, Puntarenas. During the dry season, the streambed becomes entirely parched, except for a few scattered pools that serve as critical refuges for aquatic life.
This particular pool, formed in a pothole-like depression among rocks and leaf litter, was documented during the driest time of the year. It harbored Pterobrycon myrnae and Brachyrhaphis terrabensis, species capable of surviving under these extreme conditions.
Further downstream, the presence of larger pools indicates that the stream reconnects during the rainy season; however, this recreated biotope focuses on the isolated microhabitat where these fish endure seasonal desiccation. It also provides shelter for Pterobrycon myrnae, one of Costa Rica’s smallest known tetras, underscoring the ecological importance of ephemeral freshwater habitats.
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