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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 first attack by O. suberosus on L. olivacea eggs, according to egg condition under laboratory conditions.+ denotes 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.g005: Time to first attack by O. suberosus on L. olivacea eggs, according to egg condition under laboratory conditions.+ denotes eggs that were never attacked during the experiment. L = live eggs, C = combination of live and dead eggs, D = dead eggs.

Mentions: Eggs had been incubating for one week at the beginning of the experiment with damage to the first egg occurring 2–17 days later. The minimum adequate model only included the condition of the egg as the sole factor associated with the probability that the beetle would begin to consume the turtle eggs. Egg abundance and the interaction between egg abundance and condition had no significant effect. Contrast analysis showed that the treatments with dead and live eggs (combined) were no different from those with only dead eggs (Z = 1.23, p = 0.22), but that the time to the onset of damage to the eggs in the treatments with live eggs was significantly longer than in the combined treatment (Z = 3.342, p = 0.0008, Fig 5), i.e., the treatments with both live and dead eggs were consumed more quickly by the beetles (mean ± SE = 11.5 ± 1.88 days, min. = 1, max. = 26 days). Live eggs were more likely to remain intact over time and more time elapsed before the beetles began to consume them (31.4 ± 7.11 days, min. = 2, max. = 69 days). The results for the treatments with dead eggs fell between those for live eggs and the combination of live and dead eggs (17 ± 3.70 days, Min. = 1, Max. = 56 days).


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 first attack by O. suberosus on L. olivacea eggs, according to egg condition under laboratory conditions.+ denotes 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.g005: Time to first attack by O. suberosus on L. olivacea eggs, according to egg condition under laboratory conditions.+ denotes eggs that were never attacked during the experiment. L = live eggs, C = combination of live and dead eggs, D = dead eggs.
Mentions: Eggs had been incubating for one week at the beginning of the experiment with damage to the first egg occurring 2–17 days later. The minimum adequate model only included the condition of the egg as the sole factor associated with the probability that the beetle would begin to consume the turtle eggs. Egg abundance and the interaction between egg abundance and condition had no significant effect. Contrast analysis showed that the treatments with dead and live eggs (combined) were no different from those with only dead eggs (Z = 1.23, p = 0.22), but that the time to the onset of damage to the eggs in the treatments with live eggs was significantly longer than in the combined treatment (Z = 3.342, p = 0.0008, Fig 5), i.e., the treatments with both live and dead eggs were consumed more quickly by the beetles (mean ± SE = 11.5 ± 1.88 days, min. = 1, max. = 26 days). Live eggs were more likely to remain intact over time and more time elapsed before the beetles began to consume them (31.4 ± 7.11 days, min. = 2, max. = 69 days). The results for the treatments with dead eggs fell between those for live eggs and the combination of live and dead eggs (17 ± 3.70 days, Min. = 1, Max. = 56 days).

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