Monitoring data of marine turtles on the Togolese coast over 2012-2013 years
Citation
Assou D, Segniagbeto G H, Radji R, AKPENE A (2018). Monitoring data of marine turtles on the Togolese coast over 2012-2013 years. Version 1.2. Université de Lomé. Occurrence dataset https://doi.org/10.15468/gqqxvm accessed via GBIF.org on 2025-02-17.Description
Sea turtles emerged about 130 million years ago and are the only marine forms of the reptilian class (Márquez 1990, Frazier 2003). They are migratory species whose populations are essentially distributed in the intertropical zone (Pritchard 1997). Because of their phylogeny, physiology and behavior, these species represent an ancient and important component in marine and coastal ecosystems (Ferraroli et al. 2003). They occupy all ecological niches available in the marine ecosystems. They are herbivorous, carnivorous or omnivorous and are preyed upon by large marine predators such as sharks and orcas (Bjordal 1997). Frazier (1999) and Bjorndal et al. (2003) have demonstrated that these animals play an important role in their habitats, and their vitality depends on the exploitable resources (fish, molluscs and mangroves). According to Segniagbeto et al. (2017), fishing nets represent the main conservation problem for the various Togolese sea turtle species, and cause demographic strain of turtle populations. As sea turtles migrate over thousands of kilometers, and the fact that they take tens of years to reach maturity, sea turtles serve as health indicators of coastal and marine environments, both locally and globally (Meylan et al. 1999, Frazier 1999, Fretey 2001). In West Africa and particularly in Togo, a number of studies have focused on marine turtles (Fretey 2001, Segniagbeto et al. 2013, 2014, 2016, 2017). Of the six species known worldwide, five are present in Togo. These are: green turtle (Chelonia mydas), olive ridley (Lepidochelys olivacea), loggerhead turtle (Caretta caretta), hawksbill turtle (Eretmochelys imbricata) and leatherback turtle (Dermochelys coriacea). According to the above-mentioned works, feeding and reproduction are the main reasons explaining the presence of these species on the Togolese coast. As part of the implementation of the Environmental and Social Management Plan (ESMP), linking to the container terminal construction at the Lomé Autonomous Port (by Lomé Containers Terminal -LCT), a follow-up program for marine turtles was developed between September 2012 and August 2013, to determine the dynamics of their attendance on the Togolese coast. For this purpose, a monitoring protocol has been developed to collect data on the presence of marine turtles at the construction site of the terminal and its area of influence. The objective of this monitoring program was to verify the assumptions made in the ESIA report, which asserts the presence of marine turtles in the project construction zone, and to propose measures to reduce risks of disturbance and accidents of these animals caused by the construction works. The data collected also made possible to analyze the ecological parameters connected to the use of Togolese beaches by marine turtle species. In the following paragraphs, we present the data collection method used in this monitoring program. The previous knowledge on digital form available from the GBIF data network is summarized in Table 1. and compared with the data contributed by the dataset here described. It almost doubles the number of records known for the three species of sea turtles from the region.Sampling Description
Study Extent
Monitoring was carried out by a network of 10 ecoguards and 5 facilitator fishers. All activities of eco-guards and facilitators are coordinated by a technical facilitator coming from the NGO. The latter retrieves weekly all data recorded by eco-guards and strips them. In addition to this coordination, he participates in night patrols, in the surveillance of fishermen's camps during the day and, when necessary, participates in the facilitation of the release of captured sea turtles. Data collected are then transmitted to the NGO scientific coordinator who analyses the data recorded and outputs summary results every semester.Sampling
The method of data collection is based on regular monitoring of nesting beaches and the different camps of fishermen. Surveillance is organized day and night. For security reasons, patrols at night were organized in the early morning between 04:00 and 06:00 am. Visits were carried out every day from September 2012 to August 2013. During the day, fishing camps are monitored between 10:00 am and 4:00 pm in order to recover and release the animals captured alive by these fishermen. This work is carried out according to the characteristics of the sites in particular the parameters related to the safety of the places and the work period of the coastal fishermen. The average observation effort per ecogard and per site varies between 60 and 90 hours per month. Two ecoguards positioned per site are chosen from the villages located at the ends of their site, and specifically educated for this study patrolled the sections on a daily basis collecting data. During patrols, ecoguards per site meet every day at a point on their site. This technique allows to cover all the highlights of their site. Thus, all information is collected systematically. Each turtle was identified to species and sex, and its carapace was measured with a tape following the technique by Bolten (1999). Data for females coming to lay on these beaches were recorded on a form where details such as species, date and time of laying, the locality, the biometric measurements, the return to sea or the death of the individual were recorded. The form also allowed recording of tracks on beaches, accidental capture and killing by fishermen, killing and other information. Besides this collection form, field notebooks were used to register other observations on each individual encountered on the beaches. Ecoguards used the identification sheets developed by Fretey and Prichard (2000) to recognize the different species present on the Togolese coast.Method steps
- Monitoring was carried out by a network of 10 ecoguards and 5 facilitator fishers. All activities of eco-guards and facilitators are coordinated by a technical facilitator coming from the NGO. The latter retrieves weekly all data recorded by eco-guards and strips them. In addition to this coordination, he participates in night patrols, in the surveillance of fishermen's camps during the day and, when necessary, participates in the facilitation of the release of captured sea turtles. Data collected are then transmitted to the NGO scientific coordinator who analyses the data recorded and outputs summary results every semester.
Taxonomic Coverages
Over the 2012-2013 period, and during the monitoring campaign, three species of marine turtles were observed. 740 occurrences were recorded and distributed as follows: 409 individuals of olive ridley turtle (Lepidochelys olivacea), 309 occurrences of green turtle (Chelonia mydas), and 19 of leatherback turtle (Dermochelys coriacea). A figure shows the distribution of these turtle on the Togolese coast. This distribution is more or less important depending on the collection locations.
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(Lepidochelys olivaceacommon name: Oliv ridley rank: species
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Chelonia mydascommon name: Green turtle rank: species
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Dermochelys coriaceacommon name: Leatherback rank: species
Geographic Coverages
General spatial coverage: This monitoring program was carried out all over the Togolese coast. This coast stretches from Kodjoviakopé, the last Togo district before Togo-Ghana border to Aného, a city in Togo which borders Benin (Togo-Benin border). For the study, this area was subdivided into 5 sites.
Coordinates: The study area is located between 6°6'32.4''N and 6°17'31.2''N Latitude; and 1°8'13.2''E and 1°49'1.2''E Longitude (DMS).
Bibliographic Citations
- Bjorndal KA (1997) Foraging ecology and nutrition of sea turtles. In: Lutz PL, Musick JA (Eds) The biology of sea turtles. CRC Press, Boca Raton, London, New York, Washington DC, (1): 199-231. Bjorndal KA, Jackson JBC (2003) Role of sea turtles in marine ecosystems: reconstructing the past. In: In: Lutz PL, Musick JA (Eds) the Biology of Sea Turtles. CRC Press, Boca Raton, London, New York, Washington DC, (1): 259–273. Bolten AB (1999) Techniques for measuring sea turtles. In: Eckert Kl, Bjorndal KA, Abreu-Grobois FA, Donnelly M (eds.) Research and management techniques for the conservation of sea turtles. IUCN/SSC Marine Turtle Specialist Group, Washington DC, 4: 1-5. Dossou-Bodjrenon J, Dossa Gbo C F (2015) National census of Lepidochelys olivacea (Benin). Version 1.1. GBIF Benin. Occurrence Dataset https://doi.org/10.15468/ojxxps accessed via GBIF.org on 2018-04-07. Ferraroli S, Le Maho Y, Georges J-Y (2003) Impact de la pêche sur l’environnement et impact de l’environnement sur la pêche: les tortues marines. In La surexploitation des ressources marines vivantes. Comptes Rendus de l’Académie des Sciences, rapport sur la science et la technologie, 223-229. Frazier JG (1999) Community-Based conservation. In: Eckert Kl, Bjorndal KA, Abreu-Grobois FA, Donnelly M (eds.) research and management techniques for the conservation of sea turtles. IUCN/SSC Marine Turtle Specialist Group, Washington DC, 4: 15–18. Frazier J (2003) Prehistoric and ancient historic interactions between humans and marine turtles. In: Lutz PL, Musick JA (Eds) the Biology of Sea Turtles. CRC Press, Boca Raton, London, New York, Washington DC, (1):1-38. Fretey J, Prichard PCH (2000) Tortues marines de l’Atlantique : Clé de détermination, Fiche d’identification, CMS, Bonn, Germany, (5): 1-69. Fretey J (2001) Biogeogrphy and Conservation of Marine Turtles of the Atlantic Coast of Africa. Technical Series Publication, CMS, Bonn, Germany, (6): 429. iNaturalist.org (2018) iNaturalist Research-grade Observations. Occurrence Dataset https://doi.org/10.15468/ab3s5x accessed via GBIF.org on 2018-04-07. Kiki P, Ganglo J (2017) Census of the threatened species of Benin. Version 1.5. GBIF Benin. Occurrence Dataset https://doi.org/10.15468/fbbbfl accessed via GBIF.org on 2018-04-07. Kingbo A, Kiki PPB (2016) Census of the animals of Benin. Version 1.2. GBIF Benin. Occurrence Dataset https://doi.org/10.15468/h7rqo9 accessed via GBIF.org on 2018-04-07. Márquez RM (1990) FAO species catalogue: Sea turtles of the world. An annotated and illustrated catalogue of sea turtles species known to date. FAO Fisheries Synopsis, Rome, 125(11): 81. McClain C, Mackay K (2017) Sizing Ocean Giants. Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node. Occurrence Dataset https://doi.org/10.15468/mfxiws accessed via GBIF.org on 2018-04-07. Meylan A, Donnelly M (1999) Status justification for listing the hawksbill turtle (Eretmochelys imbricate) as Critically Endangered on the IUCN Red List of Threatened Animals. Chelonian Conservation and Biology, 3(2): 200-224. Pritchard PCH (1997) Evolution, phylogeny, and current status. In: In: Lutz PL, Musick JA (Eds) the Biology of Sea Turtles. CRC Press, Boca Raton, London, New York, Washington DC, (1): 1–28. Schlüter DA (2015) SMNS Herpetologie. Staatliches Museum für Naturkunde Stuttgart. Occurrence Dataset https://doi.org/10.15468/mi2dlu accessed via GBIF.org on 2018-04-07. Segniagbeto H (2004) Les formations végétales de bord de mer: sites de nidification des tortues marines au Togo, DEA, Faculté des Sciences, Université de Lomé, 51. Segniagbeto GH, Bowessidjaou JE, Dossou-Bodrjenou J, Sagbo P, Fretey J (2013) Suivi des populations de tortues marines pendant la saison 2002-2003 entre le Togo et le Bénin. Bulletin de la Société Herpétologique de France, 147: 299 - 308. Segniagbeto GH, Bour R, Ohler A, Dubois A, Roedel M-O, Trape J-F, Fretey J, Petrozzi F, Aïdam A, Luiselli LA (2014) Turtles and tortoises of Togo: historical data, distribution, ecology and conservation. Chelonian Conservation and Biology, 13(2): 152 – 165. Segniagbeto GH, Afiademagno K, Akani GC, Petrozzi F, Luiselli LA (2015). Sex-ratio, population size-structure and morphometrics of tortoises and turtle species from Togo, West Africa. Herpetozoa, 28 (1/2): 29 – 38. Segniagbeto HG, Okangny D, Afiademagno K, Kpotor K, Denadi D, Fretey J, Luiselli L (2016) Spatio-temporal patterns in occurrence and niche partitioning of marine turtles along the coast of Togo (West Africa). Herpetozoa, 29 (1/2): 15 – 26. Segniagbeto HG, Okangny D, Denadi D, Fretey J, Luiselli L (2017) Body size and stability in the spatio-temporal distribution pattern of sea turtles along the coasts of Togo: implications for conservation and ecotourism. Herpetozao, 30 (1/2). Segniagbeto GH, Okangny D, Mondedji AD, Assou D, Amori G, Dendi D, Luiselli L (2017) Sea turtle bycatch analysis revealed that site influenced mortality more than net types along the coast of Togo. Vie et Milieu – Life and Environment, 67 (3-4): 227-234. -
Contacts
Délagnon Assouoriginator
position: Collector
ONG Agbo-Zégué
Face Marché Baguida
Lomé
BP 6057
Maritim
TG
Telephone: +22891772611
email: delagnonbio10@yahoo.fr
Gabriel H. Segniagbeto
originator
position: Executive Director
ONG Agbo-Zégué
Face Marché Baguida
Lomé
BP 6057
Maritim
Telephone: +22890099659
email: h_segniagbeto@yahoo.fr
Raoufou Radji
originator
position: Herbarium Curator
Togo National Herbarium, GBIF Togo
Faculty of Science - University of Lome
Lomé
01BP1515
Lomé
TG
Telephone: +22890045114
email: pradji@univ-lome.tg
userId: http://orcid.org/0000-0001-6597-8438
Akpene AKPENE
metadata author
position: IT
University of Lomé, GBIF Togo
Boulevard Eyadema
Lomé
01BP1515
Lomé
TG
Telephone: +22890038866
email: koudjoa@yahoo.fr
Francisco Pando
author
Real Jardín Botánico-CSIC
Real Jardín Botánico-CSIC, Claudio Moyano 1
Madrid
28014
ES
email: pando@rjb.csic.es
Délagnon Assou
administrative point of contact
position: Collector
ONG Agbo-Zégué
Face Marché Baguida
Lomé
BP 6057
Maritim
TG
Telephone: +22891772611
email: delagnonbio10@yahoo.fr
Gabriel H. Segniagbeto
administrative point of contact
position: Executive Director
ONG Agbo-Zégué
Face Marché Baguida
Lomé
BP 6057
Maritim
TG
Telephone: +22890099659
email: h_segniagbeto@yahoo.fr