Leatherback turtle analysis

Appendix I CMS listing: Although Atlantic populations are rather more stable, scientists believe that they, too, will decline due to the large numbers of adults being killed accidentally by fishing fleets. In the Atlantic, the fact that they are widely distributed during the migration process increases the risk of interaction of leatherback turtles with longline fisheries.

Leatherback turtle analysis

Tracking data are stored on www. Requests for materials should be addressed to moc. Data are also available from the Dryad Digital Repository: Abstract Large oceanic migrants play important roles in ecosystems, yet many species are of conservation concern as a result of anthropogenic threats, of which incidental capture by fisheries is frequently identified.

Leatherback sea turtle - Wikipedia

The last large populations of the leatherback turtle, Dermochelys coriacea, occur in the Atlantic Ocean, but interactions with industrial fisheries could jeopardize recent positive population trends, making bycatch mitigation a priority. Here, we perform the first pan-Atlantic analysis of spatio-temporal distribution of the leatherback turtle and ascertain overlap with longline fishing effort.

Data suggest that the Atlantic probably consists of two regional management units: These are reinforced by reports of leatherback bycatch at eight of these sites. International collaborative efforts are needed, especially from nations hosting regions where susceptibility to bycatch is likely to be high within their exclusive economic zone northern Atlantic: Angola, Brazil, Namibia and UK and from nations fishing in these high-susceptibility Leatherback turtle analysis, including those located in international waters.

Introduction In recent years, there has been increasing effort to sustainably manage fish populations and reverse the collapse of many target species [ 1 ].

Leatherback turtle analysis

Bycatch occurs globally and can particularly impact highly migratory species, whose movements can lead to an increased probability of interaction [ 3 ]. Assessing the susceptibility of such species to bycatch is challenging, as it requires an understanding of the transboundary nature of their movements, and thus requires multinational collaboration [ 4 ].

A key step forward is to map the spatio-temporal distribution of the Leatherback turtle analysis and the extent of interactions with fisheries e. Adopting this approach generally requires large numbers of individuals to be remotely tracked, preferably from different populations and over extended periods of time, which few individual projects have achieved [ 6 — 9 ].

The highly migratory leatherback turtle, Dermochelys coriacea, is of conservation concern mainly due to the recent dramatic declines in the Pacific [ 10 ]. Today, the majority of the world's leatherback turtles occur in the Atlantic Ocean [ 1112 ], where several rookeries have been reported to be stable or increasing [ 11 ].

Associated Data

Although conservation measures at sub-basin scales have been implemented [ 13 ], in both the northern and southern Atlantic bycatch in artisanal and industrial fisheries remains a major threat [ 31415 ].

In the Atlantic Ocean, the scale of pelagic longline fishing effort is particularly extensive [ 16 ] and these fisheries may have a considerable impact on leatherback turtles [ 314 — 16 ].

In the past decade, more than 30 satellite-tracking studies of leatherback turtles in the Atlantic Ocean have been published see electronic supplementary material, table S1 and each of these studies has given an essential, yet partial description of habitat use. Here, we present the first integrated analysis of the spatio-temporal distribution and habitat use of leatherback turtles between reproductive seasons at the scale of the Atlantic Ocean.

This information is combined with data on the distribution of pelagic longline fishing effort obtained from the International Commission for the Conservation of Atlantic Tunas ICCAT across the same temporal period.

This study presents a unique opportunity to identify the areas and seasons of highest susceptibility to turtle bycatch, and provides much-needed preliminary guidance on the design and implementation of potential bycatch mitigation measures at an oceanic scale.

Material and methods a Turtle-tracking dataset Between June and Februaryplatform transmitter terminals PTTs were deployed on leatherback turtles in the Atlantic Ocean and in the southwestern Indian Ocean see electronic supplementary material, table S1.

Our study involves an integrative synthesis of these data, which were all previously published in scientific peer-reviewed literature, except for two tracks see electronic supplementary material, table S1. Warehousing and standardization of satellite-tracking data from the research groups, which spanned 10 countries and four continents, were achieved using the Satellite Tracking and Analysis Tool STAT [ 21 ].

Transmissions were collected and relayed via the Argos System https: The location with the greatest spatial accuracy received in each 24 h period For each turtle, when no location was received during a 24 h period, a linear interpolation was used to interpolate the route, but only for up to 5 days following the last received valid location.

For turtles equipped in the nesting season, only movements recorded during the post-nesting period were used in the analysis.

Leatherback sea turtle - Wikipedia

In order to account for i tracks of different durations and ii tracks that end near the release location, a weighting factor was applied to the tracking dataset following the method developed by Block et al. All tracks were normalized by weighting each location estimate by the inverse of the number of individuals that had location estimates for the same relative day of their track.

We imposed a threshold relative day of tracking 85th percentile of the frequency distribution of the track lengths, i. This method, by increasing the weight of later locations and longer tracks, reduced the bias in the spatial coverage towards deployment locations.The leatherback is the only sea turtle that lacks a hard shell.

Its carapace is large, elongated and flexible with 7 distinct ridges running the length of the animal. Composed of a layer of thin, tough, rubbery skin, strengthened by thousands of tiny bone plates, the carapace does not have scales, except in hatchlings.

Leatherback turtle analysis

Leatherback Turtle Analysis Essay The world’s largest Leatherback Turtle ever recorded is known to be almost 10 feet, from the tip of its beak to the tip of its tail and it weighed approximately 2, pounds.

They can swim very fast graciously and have been clocked at . Bycatch: spatial probability analysis for leatherback turtles Tomo Eguchi Ecologist, Marine Mammal & Turtle Division.

NOAA Fisheries, Southwest Fisheries Science Center. Review of NOAA Fisheries’ Science on Marine Mammals & Turtles. Temporal predictions of leatherback turtle . The leatherback sea turtle (Dermochelys coriacea), sometimes called the lute turtle or leathery turtle or simply the luth, is the largest of all living turtles and is the Family: Dermochelyidae.

These data represent the critical habitat for leatherback turtle as designated by Federal Register Vol. 44, No. , March 23, , Rules and Regulations. Redesignated and amended at .

A recent global analysis of leatherback turtle hatchling output predicts that the nesting site at Sandy Point National Wildlife Refuge (SPNWR) will experience the most significant regional climate.

Leatherback Sea Turtle Critical Habitat