Category Archives: Gallery

Reserva Biológica Hitoy Cerere

An hour and a half hike up the Hitoy Cerere River in the biological reserved named for the river, Boa and I came across the pictured waterfall spilling into the Hitoy.  The name of the river comes from a language spoken by Native Americans in Costa Rica, and I think it translates to describe the clear water and rounded rocks covering the river bed.

The reserve is hidden away up the mountains from Dole’s banana plantations in Valle La Estrella (see the map below) and protects part of Rio Hitoy Cerere’s watershed and most of a few other smaller tributaries draining from the north.  Guessing from experience in temperate and tropical systems, I’d estimate Hitoy to be a 5th order stream: large and open, but not reliably navigable.  Further, the river is superficially similar to that in another reserve I’ve had the opportunity to visit near San Ramón – the San Lorencito in Reserva Biológica Alberto Manuel Brenes.  The cline is certainly not as steep, and the fish assemblage is more substantial (i.e., high abundances of characids and greater fish diversity) due to the lower elevation of Hitoy, but the surrounding/riparian forests and soils are appear similar.

ANAI, a group developing biomonitoring techniques for Costa Rica water ways, has used Hitoy as a referencing point for both aquatic invertebrates and fishes.

Now… all I need is to develop a proposal examining elevational gradient effects on invertebrate and fish communities important in Costa Rican biomonitoring… then I can work in these unbelievably beautiful stream locations.

Hitoy Cerere Falls - 09.24.2010 - 13.29.09_stitch Hitoy Cerere Falls - 09.24.2010 - 13.30.15_stitch
hitoy
Google Earth map showing the rough outline of Hitoy Cerere (Blue) and some of Dole's banana plantations (Red).

Nymphea stems

This September, the Palo Verde wetland was clear enough to easily see to the bottom where there were no macrophytes present blocking the sunlight.  This phenomenon is in sharp contrast to what is observed early in the wet season, when tannins and other darkening pigments are leached into the waters from copious amounts of decomposing organic matter and the wetland water appears almost black.

As a result, lily stems can be seen and traced to their origin.

Views from El Puente - 09.16.2010 - 11.16.13

Hesperiidae larval abundance

The skipper (Hesperiidae) caterpillar is again quite abundant and has nearly completely defoliated the Thalia geniculata at Palo Verde.  There are a few patches with limited herbivory, and it would be interesting to test whether those patches free of the larva were relatively small, or had reduced density or were otherwise missed by the adults when laying eggs.  I’ve collected some and hope they pupate so I can identify the adult.

Thalia skipper larvae - Hesperiidae - 09.16.2010 - 10.34.07Thalia skipper larvae - Hesperiidae - 09.16.2010 - 10.04.32Thalia skipper larvae - Hesperiidae - 09.15.2010 - 19.35.21Thalia skipper larvae - Hesperiidae - 09.16.2010 - 10.35.22