Tag Archives: Research

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).

Some pictures of poles

Within my fence at PV, I have several poles designating sites where my decomposition bundles were attached.  Here’s a last set of photos before I took the poles out (with the help of another IRES student, Michelle).

Notice the depth in the last photo – the wooden fence post stands about 6’ 5’’ from the wetland bottom. I’m not exactly bending down to take a photograph with the vegetation in the foreground….

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More decomposition bundle collection

A few more photographs of the second collection period.  It was a cloudy, humid morning, and the colors turned out a bit differently than last time because I know nothing about white balance. Additionally, a whole subset of photo I took where more or less ruined by the humidity – condensation had formed on my lens and made the images fuzzy.  I’ve included one of those images though.

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Diversity effects on decomposition field collection

A couple of days ago, I collected a set of decomposing plant material bundles for my diversity effects on decomposition study.  Again, this sequence illustrates some of the methods used to collect the ‘decomposition bundles’ – a combination of dead macrophyte tissue from one to five species, wrapped up with a zip-tie and attached to a string.  Replicates are attached to the poles shown here and below (there are five).

Briefly, I uncovered the bundles, carefully sniped them from the string, placed them on a white tray, and bagged them in Whirl-Paks.  From there, there is lab processing, which I’ll hopefully have a similar post for soon…

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Replicate posts

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The bundle is nearly indistinquishable from the rest of the plants around it.
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A tray filled with individual bundles, waiting to be bagged.

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Number 2.
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Clipping a bundle from the string.

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Recording bundle identification numbers
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A potato sack was used to carry finished samples. It nicely floats in the 1.5 m of water.

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Next time, I'm going to try to get a photograph of myself, to illustrate the depth.
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Bagged samples.

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Collection gear.

Diversity effects on decomposition

Here’s a big post illustrating a decomposition assay I recently set out in the wetland.  I created bundles of dead, dried macrophytes in various mixtures, attached them to 3-m of nylon rope and tied the rope to posts in the wetland.   I’ll be collecting a sample soon and may post another sequence.

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The overall weighing set-up
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Bundles of different plant mixtures were separated and stored in these mesh bags until use.
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A pile of cattail waiting to be weighed.

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Some bundles were placed in a bucket

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Data entry
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Accumulating bundles

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A poor photo, but this shows the raw material - large bags of dried plant.

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A few small piles of water lily, water hyacinth and Neptunia.
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A tag and ziptie.
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Piles

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Finished bundles
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An array of 21 different combinations of organic matter
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Each bundle was attached to a nylon rope
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Imagine 3 m of this!

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Post placement in the wetland.
A view of the posts
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A sinking bundle

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Number 70

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Another bundle
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The wetland is deeper and more lush this year

Rubén (España)

Rubén, an ornithologist from Valencia, Spain, helped me collect Neptunia one day.  He’s currently here to characterize dry forest wetlands using a variety of limnological techniques; consequently, I got to travel around with him on my birthday to a few local wetlands – beautiful wetlands at higher elevation, with cooler temperatures and without mosquitoes.  Pictures will come.

When we play soccer, Rubén is usually on my team, along with any other gringos at the station, so the contest is Ticos contra El Resto del Mundo (Costa Rica versus the rest of the world).  We lost the other day 5 –15.  Sad.

Neptunia collection with Ruben - 06.22.2010 - 13.58.49

Wetland 3 - 06.30.2010 - 14.46.31