In the course of their work, they came across extensive nesting grounds that bring new hope for the survival of the leatherback turtle. This species suffered a grave decline in the twentieth century and is among those considered by the World Conservation Union to be in critical danger of extinction.
The BBVA Foundation project, funded under its Call for Research Proposals in Conservation Biology, has been written up in the scientific journal Biological Conservation with the title: “Globally significant nesting of the leatherback turtle (Dermochelys coriacea) on the Caribbean coast of Colombia and Panama”, citing as authors Juan Patiño, Adolfo Marco and Liliana Quiñones, researchers at Doñana Biological Station (CSIC), and Brendan Godley from the Centre for Ecology and Conservation at the University of Exeter, United Kingdom.
An exceptional creature
The leatherback (Dermochelys coriacea) is the world’s largest turtle, with some individuals reaching two meters in length and weights of around 800 kilos. They can live up to 100 years, nest in topical zones and make the longest ocean crossings of any marine vertebrate, returning 11,000 kilometers to lay their eggs on the beach where they were born. They are also resistant to very low temperatures, meaning they can be found in all the world’s oceans. In fact, some have even been sighted near the polar regions.The leatherback turtle chooses hot tropical beaches to make its nest. It does not breed every year, but when it does so stands out for the large quantity of its nests—normally around seven (with cases of up to 11) per season, excavated at intervals of 15 days. Each nest has between 65 and 110 eggs and can weigh between 5 and 10 kilograms.
Exploration and discoveries
The exploration supported by the BBVA Foundation took place between the towns of Anachukuna (8º43`00`N, 77º32`50``W), in the Kunayala area of southeast Panama, and Mulatos in Colombia (8º38`55.33``N, 76º43`09.25``W) during the breeding seasons of the last three years.
Prior to the study, the zone was reckoned to harbor between 100 and 250 nesting females, though many beaches were virtually unexplored. But this latest census lifts their annual number to between 1,140 and 1,300, making it a major Atlantic Ocean breeding ground and refuge for the leatherback turtle.
Of the seven nesting beaches investigated, Armila (4.5 km length) is the most abundant in annual nests, which number from 3,600 to 4,040 units or 60% to 67% of the area-wide total. Armila’s nesting density, with an average of 900 nests per kilometer of beach, is also exceptional—the highest in the Central American Caribbean ahead of Playa Chiriquí, also in Panama, whose 128 nests per kilometer were until now considered the local maximum. Armila also stands out for the high survival rate of nests and the hatch rate of clutches, which borders on 70 %.
Javier Fernández | alfa
Robotic fish to replace animal testing
17.06.2019 | Otto-von-Guericke-Universität Magdeburg
Marine oil snow
12.06.2019 | University of Delaware
From June 25th to 27th 2019, the Fraunhofer Institute for Digital Media Technology IDMT in Ilmenau (Germany) will be presenting a new solution for acoustic quality inspection allowing contact-free, non-destructive testing of manufactured parts and components. The method which has reached Technology Readiness Level 6 already, is currently being successfully tested in practical use together with a number of industrial partners.
Reducing machine downtime, manufacturing defects, and excessive scrap
The quality of additively manufactured components depends not only on the manufacturing process, but also on the inline process control. The process control ensures a reliable coating process because it detects deviations from the target geometry immediately. At LASER World of PHOTONICS 2019, the Fraunhofer Institute for Laser Technology ILT will be demonstrating how well bi-directional sensor technology can already be used for Laser Material Deposition (LMD) in combination with commercial optics at booth A2.431.
Fraunhofer ILT has been developing optical sensor technology specifically for production measurement technology for around 10 years. In particular, its »bd-1«...
The well-known representation of chemical elements is just one example of how objects can be arranged and classified
The periodic table of elements that most chemistry books depict is only one special case. This tabular overview of the chemical elements, which goes back to...
Light can be used not only to measure materials’ properties, but also to change them. Especially interesting are those cases in which the function of a material can be modified, such as its ability to conduct electricity or to store information in its magnetic state. A team led by Andrea Cavalleri from the Max Planck Institute for the Structure and Dynamics of Matter in Hamburg used terahertz frequency light pulses to transform a non-ferroelectric material into a ferroelectric one.
Ferroelectricity is a state in which the constituent lattice “looks” in one specific direction, forming a macroscopic electrical polarisation. The ability to...
Researchers at TU Graz calculate the most accurate gravity field determination of the Earth using 1.16 billion satellite measurements. This yields valuable knowledge for climate research.
The Earth’s gravity fluctuates from place to place. Geodesists use this phenomenon to observe geodynamic and climatological processes. Using...
24.06.2019 | Event News
29.04.2019 | Event News
17.04.2019 | Event News
25.06.2019 | Architecture and Construction
25.06.2019 | Life Sciences
25.06.2019 | Power and Electrical Engineering