La tortue marine au Cameroun, genre Lepidochelys : nidification, biometrie de &lt;i&gt;Lepidochelys olivacea&lt;/i&gt; (Eschscholtz, 1829) (Reptilia, Cheloniidae) dans la réserve de faune de Campo (Sud Cameroun)

Angoni, H; Akoa, Amougou; Bilong, Charles Bilong; Fretey, Jacques

doi:10.4314/ijbcs.v4i3.60472

Cited by 3 publications

(5 citation statements)

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“…Ainsi la périphérie du parc national de Campo-Ma'an est une zone de prédilection pour l'alimentation des tortues vertes car de nombreuses observations des espèces font état des juvéniles vertes et imbriquées qui fréquentent essentiellement la zone pour leur alimentation confirme des informations d' Ayissi (2000), Ayissi et al (2006aAyissi et al ( , 2006bAyissi et al ( , 2007 et Angoni (2005Angoni ( , 2010.…”

Section: Resultsunclassified

“…Si cette zone est une aire de nidification pour l'olivâtre, tel n'est pas le cas pour la verte et l'imbriquée ceci pourrait confirmer que cette zone est une aire d'alimentation pour ces espèces et par conséquent une aire de croissance pour ces dernières. Ces résultats confirment ceux obtenus par Fretey (2001) et Angoni (2005Angoni ( , 2010 car les espèces lues sont la verte et l'olivâtre.…”

Section: Espèce Périodeunclassified

“…La côte camerounaise est particulièrement riche en de nombreuses espèces fauniques et floristiques et particulièrement les tortues marines qui fréquentent ce littoral pour l'alimentation et la nidification (Ayissi, 2000 ;Angoni, 2005Angoni, , 2010. La caractérisation de l'habitat des tortues marines et sa corrélation avec le régime alimentaire donne une image réaliste sur la zone de l'alimentation.…”

Section: Introductionunclassified

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Caractérisation des habitats benthiques et ponte des tortues marines autour du parc national de Campo-Ma’an (Cameroun)

Ayissi¹,

Aksissou²,

Tiwari³

et al. 2014

Int. J. Bio. Chem. Sci

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Pour évaluer l'importance de la périphérie du parc national de Campo-Ma'an pour la création d'un parc marin, une caractérisation des habitats benthiques a été réalisée durant 24 mois (2008-2009) et de suivi des plages pour évaluer l'importance de la population dans ce site. L'étude s'est faite à travers des suivis saisonniers de collecte d'échantillons sous marins, grâce aux plongées sous marines dans les localités d'Ebodjé et de Mbodé. Des analyses révèlent 20 espèces d'algues marines, la distribution par groupes présente, 9 Rhodophycées (45%), 6 Phéophycées (30%) et 5 Clorophycées (25%). Ces différentes espèces sont distribuées dans 11 familles : Cladophoraceae, Dictyotaceae et Chaetangiaceae avec 3 espèces chacune ; Caulerpaceae, Gelidiaceae et Gracilariaceae 2 espèces chacune; Scytosiphonaceae, Squamariaceae, Sargassaceae, Grateloupiaceae, et Rhodomelaceae avec une espèce chacune. Des analyses des contenus stomacaux des spécimens des tortues marines prises mortes au filet confirment que ces algues font parties de l'alimentation des espèces fréquentant la zone. Des patrouilles nocturnes sur les plages de ponte ont été menées d'octobre 2008 à Mars 2009 ainsi que des sorties diurnes dans les pêcheries au retour des pêcheurs pour l'identification des espèces présentes, le comptage des traces, les relevés biométriques. Des résultats nous révèlent un total de 3 450 oeufs provenant de 28 nids, soit une moyenne 150 ± 21,6 oeufs. Les incubations présentent des durées de 60 à 80 jours avec une moyenne de 70 jours.

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Section: Resultsunclassified

Section: Espèce Périodeunclassified

Section: Introductionunclassified

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Caractérisation des habitats benthiques et ponte des tortues marines autour du parc national de Campo-Ma’an (Cameroun)

Ayissi¹,

Aksissou²,

Tiwari³

et al. 2014

Int. J. Bio. Chem. Sci

Self Cite

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“…Moreover, present results on D. coriacea provide further evidence of continued growth in adult sea turtles instead of negligible growth (Omeyer et al, 2018). The mean size of L. olivacea nesting females of this study (70.4 cm) appears to be in the range of mean values from other populations in the Indian Ocean (67.1–72.6 cm CCL; Shanker, Pandav & Choudhury, 2004; Tripathy, 2016) northern Australia (69.6 cm CCL; Whiting et al, 2007), eastern Pacific (66.4 cm CCL; Rangel et al, 2011), south‐western Atlantic (73.1 cm CCL; da Silva et al, 2007), and eastern Atlantic (69.0–71.7 cm CCL; Angoni et al, 2010; Tomas et al, 2010). A reduction of size in both species was observed during the study period and comparison with previous data for D. coriacea in southern Gabon (Stewart, Johnson & Godfrey, 2007) suggest that, at least for this species, the size decline may have begun before this study period.…”

Section: Discussionmentioning

confidence: 99%

Conservation‐relevant reproductive parameters from long‐term tagging of two globally important sea turtle nesting aggregations in Central Africa

Casale,

Abitsi,

Agamboue

et al. 2023

Aquatic Conservation

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Assessing abundance and monitoring ecology and population trends are of critical importance for animal species of conservation concern. For sea turtles, annual nest counts represent the most common method of estimating population size. However, to develop a better understanding of population trends, these data need to be complemented by other reproductive parameters, which are lacking for many nesting populations across central Africa. To this end, an intensive capture–mark–recapture programme was conducted spanning 21 years (1997–2018) in the most important nesting sites on the Atlantic coast of central Africa (Gabon and Congo) for leatherback (Dermochelys coriacea) and olive ridley (Lepidochelys olivacea) sea turtles. A total of 18,105 encounters of 14,109 D. coriacea individuals and 2678 encounters of 2427 L. olivacea individuals were recorded. Biological and technical parameters such as clutch frequency, inter‐nesting interval, remigration interval, annual survival rate, somatic growth, size trends, tag loss and number of annual nesting females were estimated through a variety of methods and models. The study detected a decline in body size and low survival probability (not due to tag loss) in both species but no clear decline in estimated annual number of nesting females. High fidelity to nesting sites (<30 km for both species) implies that the current conservation strategy, protecting the main nesting areas, could be effective. We recommend that local conservation managers promote: (i) continued monitoring of the nesting activity of the two species through capture–mark–recapture programmes; (ii) continued nest counts at long‐term monitoring sites, which may also detect possible spatial shifts; and (iii) strengthening of cross‐border cooperation between Gabon and Republic of the Congo given the observed connectivity between nesting sites of the two countries.

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“…The most visited beaches were in the southern zone compared to the northern zone. Historical nesting in the area equally showed predorminance of olive ridley to leatherback turtles; 1999, 30 nests of olive ridley and 12 nests of leatherbacks and 2000, 22 nests of olive ridley and 9 nests of leatherbacks (Angoni 2005;Angoni et al 2010).…”

Section: Insights Afforded By This Workmentioning

confidence: 99%

An Assessment of Marine Turtle Nesting Rookeries in the Southern Atlantic Coastline of Cameroon: Implications for Management and Conservation

Abi,

Avin,

Fretey

et al. 2023

Preprint

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In the present study, we evaluate for the first time marine turtle nesting activity on the coastal beaches of Ebodje, South Region of Cameroon. Regular surveys were carried out over 27 km of coastline in 2013 and over a lesser zone of the studied area with less survey effort from 2014 to 2017. Three marine turtle species were detected nesting in these beaches: the olive ridley (Lepidochelys olivacea), the leatherback turtle (Dermochelys coriacea), and more rarely the green turtle (Chelonia mydas). According to interviews with local inhabitants, the coastal waters of this area are also important for juvenile green turtles and hawksbills (Eretmochelys imbricate) on feeding grounds. Nesting activity concentrates between October and March, with very rare nesting activity detected out of this period. In four nesting seasons, we detected a total of 310 nesting activities, from which 179 clutches were successful; olive ridley was by far the most abundant species (164 clutches), followed by leatherback (11 clutches) and green turtle (4 clutches). The estimated number of olive ridleys in the first nesting season ranged from 30 to 46 turtles. We included information on turtle biometrics and clutch parameters for comparison with closer nesting roockeries and contextualized them with information on human-related threats. Detected threats facing the species were bycatch in artisanal fisheries, beach erosion, light pollution in some beaches, and illegal harvesting of eggs and nesting females at beaches. To mitigate some of these threats, a hatchery was developed on the beach with the highest density of nesting activity. Although there is scarce information about southern Cameroon marine turtle nesting stocks, the levels of nesting and the information on anthropogenic threats reported here indicate that this breeding aggregation is a serious threat and that conservation initiatives are mandated here.

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La tortue marine au Cameroun, genre Lepidochelys : nidification, biometrie de <i>Lepidochelys olivacea</i> (Eschscholtz, 1829) (Reptilia, Cheloniidae) dans la réserve de faune de Campo (Sud Cameroun)

Cited by 3 publications

References 2 publications

Caractérisation des habitats benthiques et ponte des tortues marines autour du parc national de Campo-Ma’an (Cameroun)

Caractérisation des habitats benthiques et ponte des tortues marines autour du parc national de Campo-Ma’an (Cameroun)

Conservation‐relevant reproductive parameters from long‐term tagging of two globally important sea turtle nesting aggregations in Central Africa

An Assessment of Marine Turtle Nesting Rookeries in the Southern Atlantic Coastline of Cameroon: Implications for Management and Conservation

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