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Distribution and Feeding Behavior of Omorgus suberosus (Coleoptera: Trogidae) in Lepidochelys olivacea Turtle Nests.

Baena ML, Escobar F, Halffter G, García-Chávez JH - PLoS ONE (2015)

Bottom Line: O. suberosus adults and larvae exhibited an aggregated pattern at both turtle nest densities; however, aggregation was greater in areas of low nest density, where we found the highest proportion of damaged eggs.Under laboratory conditions, the beetles quickly damaged both dead eggs and a mixture of live and dead eggs, but were found to consume live eggs more slowly.We intend to apply these results when making decisions regarding the L. olivacea nests on La Escobilla Beach, one of the most important sites for the conservation of this species.

View Article: PubMed Central - PubMed

Affiliation: Instituto de Investigaciones Biológicas, Universidad Veracruzana (IIB-UV), Xalapa, Veracruz, México.

ABSTRACT
Omorgus suberosus (Fabricius, 1775) has been identified as a potential predator of the eggs of the turtle Lepidochelys olivacea (Eschscholtz, 1829) on one of the main turtle nesting beaches in the world, La Escobilla in Oaxaca, Mexico. This study presents an analysis of the spatio-temporal distribution of the beetle on this beach (in areas of high and low density of L. olivacea nests over two arrival seasons) and an evaluation, under laboratory conditions, of the probability of damage to the turtle eggs by this beetle. O. suberosus adults and larvae exhibited an aggregated pattern at both turtle nest densities; however, aggregation was greater in areas of low nest density, where we found the highest proportion of damaged eggs. Also, there were fluctuations in the temporal distribution of the adult beetles following the arrival of the turtles on the beach. Under laboratory conditions, the beetles quickly damaged both dead eggs and a mixture of live and dead eggs, but were found to consume live eggs more slowly. This suggests that O. suberosus may be recycling organic material; however, its consumption of live eggs may be sufficient in some cases to interrupt the incubation period of the turtle. We intend to apply these results when making decisions regarding the L. olivacea nests on La Escobilla Beach, one of the most important sites for the conservation of this species.

No MeSH data available.


Related in: MedlinePlus

Patchiness Values (S) for adult O. suberosus over time (35 weeks).Also shown are the precipitation (mm) and temperature (°C) profiles for September 2010 to June 2011, when sampling was conducted (data supplied by the Comisión Nacional del Agua, CONAGUA, Mexico), from the Barra de Cozoaltepec climatological station, which is the one nearest to La Escobilla Beach. The numbers above the dashed lines indicate the final four L. olivacea arrival events of the 2010–2011 season and the two first arrivals of the 2011–2012 season. The estimated number of turtle eggs deposited on the beach during each arrival event is given in parentheses (data provided by the Centro Mexicano de la Tortuga–CONANP, Mexico).
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pone.0139538.g004: Patchiness Values (S) for adult O. suberosus over time (35 weeks).Also shown are the precipitation (mm) and temperature (°C) profiles for September 2010 to June 2011, when sampling was conducted (data supplied by the Comisión Nacional del Agua, CONAGUA, Mexico), from the Barra de Cozoaltepec climatological station, which is the one nearest to La Escobilla Beach. The numbers above the dashed lines indicate the final four L. olivacea arrival events of the 2010–2011 season and the two first arrivals of the 2011–2012 season. The estimated number of turtle eggs deposited on the beach during each arrival event is given in parentheses (data provided by the Centro Mexicano de la Tortuga–CONANP, Mexico).

Mentions: Regarding temporal distribution, we found: 1) fluctuations in the aggregated distribution (S > 1) of the adult beetles following the arrival of the turtles on the beach, 2) these values decrease with the decreasing number of turtle eggs in each arribada and during the period when there were no turtle arrivals (between the end of one season and the start of the next), and 3) subsequently there was a trend of increasing O. suberosus presence in the first arrival of 2011–2012 (Fig 4).


Distribution and Feeding Behavior of Omorgus suberosus (Coleoptera: Trogidae) in Lepidochelys olivacea Turtle Nests.

Baena ML, Escobar F, Halffter G, García-Chávez JH - PLoS ONE (2015)

Patchiness Values (S) for adult O. suberosus over time (35 weeks).Also shown are the precipitation (mm) and temperature (°C) profiles for September 2010 to June 2011, when sampling was conducted (data supplied by the Comisión Nacional del Agua, CONAGUA, Mexico), from the Barra de Cozoaltepec climatological station, which is the one nearest to La Escobilla Beach. The numbers above the dashed lines indicate the final four L. olivacea arrival events of the 2010–2011 season and the two first arrivals of the 2011–2012 season. The estimated number of turtle eggs deposited on the beach during each arrival event is given in parentheses (data provided by the Centro Mexicano de la Tortuga–CONANP, Mexico).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4589367&req=5

pone.0139538.g004: Patchiness Values (S) for adult O. suberosus over time (35 weeks).Also shown are the precipitation (mm) and temperature (°C) profiles for September 2010 to June 2011, when sampling was conducted (data supplied by the Comisión Nacional del Agua, CONAGUA, Mexico), from the Barra de Cozoaltepec climatological station, which is the one nearest to La Escobilla Beach. The numbers above the dashed lines indicate the final four L. olivacea arrival events of the 2010–2011 season and the two first arrivals of the 2011–2012 season. The estimated number of turtle eggs deposited on the beach during each arrival event is given in parentheses (data provided by the Centro Mexicano de la Tortuga–CONANP, Mexico).
Mentions: Regarding temporal distribution, we found: 1) fluctuations in the aggregated distribution (S > 1) of the adult beetles following the arrival of the turtles on the beach, 2) these values decrease with the decreasing number of turtle eggs in each arribada and during the period when there were no turtle arrivals (between the end of one season and the start of the next), and 3) subsequently there was a trend of increasing O. suberosus presence in the first arrival of 2011–2012 (Fig 4).

Bottom Line: O. suberosus adults and larvae exhibited an aggregated pattern at both turtle nest densities; however, aggregation was greater in areas of low nest density, where we found the highest proportion of damaged eggs.Under laboratory conditions, the beetles quickly damaged both dead eggs and a mixture of live and dead eggs, but were found to consume live eggs more slowly.We intend to apply these results when making decisions regarding the L. olivacea nests on La Escobilla Beach, one of the most important sites for the conservation of this species.

View Article: PubMed Central - PubMed

Affiliation: Instituto de Investigaciones Biológicas, Universidad Veracruzana (IIB-UV), Xalapa, Veracruz, México.

ABSTRACT
Omorgus suberosus (Fabricius, 1775) has been identified as a potential predator of the eggs of the turtle Lepidochelys olivacea (Eschscholtz, 1829) on one of the main turtle nesting beaches in the world, La Escobilla in Oaxaca, Mexico. This study presents an analysis of the spatio-temporal distribution of the beetle on this beach (in areas of high and low density of L. olivacea nests over two arrival seasons) and an evaluation, under laboratory conditions, of the probability of damage to the turtle eggs by this beetle. O. suberosus adults and larvae exhibited an aggregated pattern at both turtle nest densities; however, aggregation was greater in areas of low nest density, where we found the highest proportion of damaged eggs. Also, there were fluctuations in the temporal distribution of the adult beetles following the arrival of the turtles on the beach. Under laboratory conditions, the beetles quickly damaged both dead eggs and a mixture of live and dead eggs, but were found to consume live eggs more slowly. This suggests that O. suberosus may be recycling organic material; however, its consumption of live eggs may be sufficient in some cases to interrupt the incubation period of the turtle. We intend to apply these results when making decisions regarding the L. olivacea nests on La Escobilla Beach, one of the most important sites for the conservation of this species.

No MeSH data available.


Related in: MedlinePlus