Reptile and Amphibian Diversity Research in the Costa Rican Rainforest

Your Impact

All of our programs have short, mid and long-term objectives that fit with the United Nations Sustainable Development Goals or UN SDGs. This enables us to report on our collaborative impact across the world in a streamlined manner, measuring which UN SDGs we are making a substantial contribution to. Furthermore, this will help our local partners and communities measure and visualise their contribution to the UN SDGs.

Upon arrival to base, you will be educated about the history of the UN SDGs. You will learn about the specific goals of your location, the long-, mid- and short-term objectives, and also clarification of how your personal, shorter-term involvement contributes to these goals on a global level.

Our aim is to educate you on local and global issues, so that you continue to act as active global citizens after your program, helping to fulfil our mission of building a global network of people united by their passion to make a difference.

Tortuguero National Park is a key area for many interlinked conservation efforts. It is a popular nesting area for vulnerable and endangered sea turtles. It is also a natural stronghold for jaguars and the only place where these cats are known to prey on sea turtles. It is also home to several insect, amphibian, reptile, mammal, and bird species identified as important or the health of the local ecosystem, global diversity, and international research by the Costa Rican Ministry of Environment, Energy, and Telecommunications or MINAET.

Rainforest Biodiversity Surveys

We assist MINAET with conducting a Biological Assessment Survey or BAS of the four major habitat types around our area of Tortuguero Park. We note a wide range of species on our surveys which are of interest to MINAET including the Rain Frog, Red-eyed Treefrog, two species of Toucan, Baird’s Tapir, Spider Monkey, Mantled Howler Monkey, White-lipped Peccary, Eyelash Palm Pitviper. Staff and participants walk a several marked path in the forest noting sighting, tracks, and vocalisations. Only species identified with 100% certainty can be recorded. The data is sent to MINAET who use a standardised methodology to monitor the condition of each trail over time. This helps them to understand the health of the local environment and whether their current conservation efforts are working.

Sea Turtle Research

We also assist the Sea Turtle Conservancy, or STC, with sea turtle research and protection, by patrolling the Southern end of 18 mile stretch of Tortuguero National Park using internationally recognised protocols during turtle nesting and hatching season, from around March to December each year. The STC patrols the northern stretch.

Tortuguero has played a key part in the conservation of sea turtles worldwide. Archie Carr, the pioneering American conservationist, began his studies of green turtles in Tortuguero in 1954 and since 1958 the STC, has continued work on green turtles, which are currently endangered, and the other turtle species, like the endangered loggerhead, critically endangered hawksbill, and vulnerable leatherback, who frequent this area.

From March to October, a team walks the beach each night looking for nesting sea turtles.

Depending on the time of year, it is possible to do several walks without seeing a turtle, or see multiple ones in one night. When a turtle is encountered, different kinds of research activities might be carried out, depending on what stage of the nesting process she is in from emerging from the sea, selecting a nest site, digging a body pit, and digging her egg chamber to laying her eggs, covering her egg chamber, disguising her nest, or returning back to sea. This might include, checking for distinctive markings to see if she has been to the beach before and make a note for future researchers if she returns, tagging her flippers, measuring her carapace, counting her eggs, marking her nest, or checking for abnormalities in the mother turtle or eggs.

From April to November a team patrols the beach during the day to look for nests that were marked previously to determine whether any of the nests have hatched, been eroded by the sea, been attacked by predators like jaguars, or been poached by humans. This information is used to investigate whether any areas of the beach are more susceptible to nest loss. Depending on the season, we also take note of mother turtle tracks from the previous night.

Between June and December, hatched nests are excavated to determine hatchling success and survival rates, reason for losses in egg development, and determine the actual status of the nests including whether or not they were partially or fully poached.

Throughout the year our teams carry out beach cleans to ensure a good nesting place for mother turtles and an uninterrupted passage for hatchlings to make their way to the sea.

Jaguar Population and Turtle Predation Research

The jaguar is the only member of the Panthera or ‘big cat’ genus found in the the Western Hemisphere. The International Union for the Conservation of Nature, or IUCN, Red List has given the jaguar the status of being ‘near threatened’.

Tortuguero is a haven for jaguars, having possibly one of the highest populations in the world. This makes it an excellent location for studying jaguar behaviour. However, it also means there is a great responsibility on park authorities and the Costa Rican government to ensure that threats as a result of human activity like poaching, habitat and food source degradation do not threaten jaguar numbers in Tortuguero. Tortuguero is also one of the only places in the world where jaguars are known to feed on adult sea turtles. There has also been concern that the number of sea turtles preyed upon by jaguars has been increasing.

We assist MINAET with estimating the minimum number of jaguars using the coastal habitat inside Tortuguero National Park, identifying the availability of prey species in the area, noting any changes in jaguar feeding behaviour, and determining whether the predation of marine turtles by jaguars is having an impact on the marine turtle populations. This helps the Costa Rican Ministry of Environment develop well-rounded and consistent conservation policies. To improve and expand our research, we collaborate with Panthera and Coastal Jaguar Conservation.

Direct observations of jaguars can be very difficult to achieve because of their elusive nature. Several projects of elusive species worldwide have turned to remote observation techniques in order to estimate population sizes, for species in which individuals are identifiable by markings, or relative abundance, for those species in which individuals are not identifiable. Camera trapping projects have been used to estimate tiger density within national parks in India and ocelot densities in the Pantanal region of South America to name a few. Other projects in Costa Rica such as the Tropical Ecology Assessment and Monitoring Network, or TEAM Initiative from Conservation International and Wildlife Conservation Society, or WCS, Jaguar Project in Corcovado National Park have also had success with camera trapping of jaguars. We started our jaguar camera trap program in 2006 and it has been constantly evolving ever since as new, more effective methodologies continue to be developed.

From February to November, our team walks a 15-mile stretch of the beach starting in the early morning to note jaguar tracks and check on permanent camera traps set up to ID new or known jaguars in the area. Permanent cameras are set up in areas of known jaguar activity in the vegetation lining the beach. A scent station might be included to halt the jaguar in their progress so that a clearer picture of their rosette pattern markings can be taken for use in identification. We also collect jaguar scat or faeces for use in jaguar feeding behaviour and genetic studies.

During turtle nesting season, from March to October, we also monitor the number of sea turtles preyed upon by jaguars. When a predated turtle is found we note the species of turtle, assign an identification number, and check for tags. We also record the time and location, biometric data, and a description of the style of predation. Killcams are set up on predated turtles to witness jaguar behavior as they return to the kill. In addition, data is collected on weather and beach conditions at specific areas.

Aquatic Bird Research

We also monitor 30 aquatic bird species identified by MINAET as important indicators of the ecological health of the National Park as a whole. These include exotic ave species like the neotropic cormorant, the rufescent tiger-heron, the cattle egret, the green ibis, and the amazon kingfisher. Early morning surveys are conducted on canoe along five of Tortuguero’s canals and last approximately 3 hours. Species are identified and specifics such as their sex and breeding behaviour are noted. The aim of this project is to help researchers and governmental authorities understand when and where resident species migrate to. It is generally believed that seasonal migration takes place within Costa Rica but details are lacking. It also helps MINAET with developing an accurate management plan for Tortuguero National Park. In addition, we collect information on all incidental species seen on the canals. Sightings of megafauna like endangered manatees are extremely important to MINAET as they provide evidence towards justifying the boundaries of the National Park and whether to extend them.

As such, the specific United Nations Sustainable Development Goal we work on in Tortuguero park is #15, Life On Land.

Our Partners In Jalova

Project Objectives