The olive ridley sea turtle, Lepidochelys olivacea (Eschscholtz, 1829), nests en masse in the protected natural area of La Escobilla, Mexico. On this beach, Omorgus suberosus (Fabricius, 1775), a sapro-necrophagous beetle, feeds on the sea turtles’ decomposing and live eggs and is considered to be a threat for the conservation of L. olivacea. However, the abundance and reproductive phenology of O. suberosus in relation to the spatial and temporal availability of this food resource are unknown. We tested two alternative hypotheses during the 2013–2014 nesting season of L. olivacea: (i) abundance and female reproductive phenology of beetles are determined by the spatial and temporal availability of decomposing eggs that accumulate during the turtle nesting season, and (ii) abundance and female reproductive phenology of beetles are related to the increase in the concentration of seasonal and/or new turtle nests. Twenty-four plots (1 m²) were sampled in three areas with different turtle nesting densities. Spatially, beetle abundance was greater where turtle nest density was high and decomposed eggs were abundant. At the temporal level, old nests (> 45 days after egg deposition) were abundant and the presence of seasonal and new nests (~ 45 or fewer days after egg deposition) appeared to trigger sexual maturation in female beetles. Immature female beetles were more abundant throughout the turtles’ nesting season, and mature females were only abundant during the turtle arribadas with the highest number of seasonal nests. We conclude that abundance and female reproductive phenology of O. suberosus females are influenced by the quantity and quality of the resource. These findings are useful to understand the interaction of L. olivacea with other species and to strengthen the conservation plans of this turtle species.

橄榄色的里德利海龟Lepidochelys olivacea（Eschscholtz，1829年）在墨西哥La Escobilla受保护的自然地区大量筑巢。在这个海滩上，腐烂的食虫甲虫Omorgus suberosus（Fabricius，1775年）以海龟的分解卵和活卵为食，被认为是对L. olivacea保护的威胁。然而，关于该食物资源的时空可用性的地下枯草芽孢杆菌的丰度和生殖物候是未知的。我们在2013-2014年间的L. olivacea筑巢季节检验了两个备选假设：（i）甲虫的丰度和雌性生殖物候由甲鱼筑巢季节中积累的分解卵的时空可用性决定;（ii）甲虫的丰度和雌性生殖物候与浓度的增加有关季节性和/或新的海龟巢。二十四个地块（1 m ²）分别在三个具有不同龟巢密度的区域采样。从空间上看，甲鱼巢密度高且分解的卵丰富时甲虫的丰度更大。在时间上，老巢（产卵后> 45天）丰富，季节性和新巢（产卵后约45天或更短）的出现似乎触发了雌性甲虫的性成熟。在龟的筑巢季节中，未成熟的雌性甲虫更为丰富，而仅在龟中的季节性巢穴数量最多的成年雌性甲虫中才是丰富的。我们得出的结论是，该资源的数量和质量影响到了地下美洲带。雌性的丰度和雌性生殖物候。这些发现有助于理解橄榄与其他物种一起可以加强对这种龟的保护计划。