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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

Time to total damage of the entire clutch of turtle eggs, as a function of egg type under laboratory conditions.+ indicates eggs that were never attacked during the experiment. L = live eggs, C = combination of live and dead eggs, D = dead eggs.
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pone.0139538.g006: Time to total damage of the entire clutch of turtle eggs, as a function of egg type under laboratory conditions.+ indicates eggs that were never attacked during the experiment. L = live eggs, C = combination of live and dead eggs, D = dead eggs.

Mentions: The minimum adequate model for this variable included both egg abundance and condition, but the interaction between them was not found to be significant. The entire clutch of eggs was consumed more quickly when nest abundance low, although the difference was only marginally significant (Z = 2.02, p = 0.043). The mean time in days (±SE) for damage to the entire clutch for high nest abundance was 41.07 ± 19.7 (n = 26, min. = 18, max. = 86) and 27.55 ± 19.22 for low nest abundance (n = 27, min. = 4, max. = 72). The contrast analysis detected no difference in the time to total damage of the clutch between the treatments with both live and dead eggs (combined) and those with dead eggs only (Z = 0.368, p = 0.713); however, there were differences between the treatments with combined eggs and those with only live eggs (Z = 3.385, p < 0.001; Fig 6). Mean time in days (± SE) for total damage to clutches with dead eggs was 30.58 ± 3.52 (n = 19, min. = 7, max. = 70) compared to 45.86 ± 8.05 (n = 14, Min. = 4, Max. = 86) for nests with live eggs. Nests with both live and dead eggs took 29.45 days ± 2.88 (n = 20, min. = 7, max. = 54) to be completely consumed.


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)

Time to total damage of the entire clutch of turtle eggs, as a function of egg type under laboratory conditions.+ indicates eggs that were never attacked during the experiment. L = live eggs, C = combination of live and dead eggs, D = dead eggs.
© Copyright Policy
Related In: Results  -  Collection

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

pone.0139538.g006: Time to total damage of the entire clutch of turtle eggs, as a function of egg type under laboratory conditions.+ indicates eggs that were never attacked during the experiment. L = live eggs, C = combination of live and dead eggs, D = dead eggs.
Mentions: The minimum adequate model for this variable included both egg abundance and condition, but the interaction between them was not found to be significant. The entire clutch of eggs was consumed more quickly when nest abundance low, although the difference was only marginally significant (Z = 2.02, p = 0.043). The mean time in days (±SE) for damage to the entire clutch for high nest abundance was 41.07 ± 19.7 (n = 26, min. = 18, max. = 86) and 27.55 ± 19.22 for low nest abundance (n = 27, min. = 4, max. = 72). The contrast analysis detected no difference in the time to total damage of the clutch between the treatments with both live and dead eggs (combined) and those with dead eggs only (Z = 0.368, p = 0.713); however, there were differences between the treatments with combined eggs and those with only live eggs (Z = 3.385, p < 0.001; Fig 6). Mean time in days (± SE) for total damage to clutches with dead eggs was 30.58 ± 3.52 (n = 19, min. = 7, max. = 70) compared to 45.86 ± 8.05 (n = 14, Min. = 4, Max. = 86) for nests with live eggs. Nests with both live and dead eggs took 29.45 days ± 2.88 (n = 20, min. = 7, max. = 54) to be completely consumed.

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