ABSTRACT This paper reports on the nest and hatchlings of ‘Olive Ridley turtle’ Lepidochelys oliv... more ABSTRACT This paper reports on the nest and hatchlings of ‘Olive Ridley turtle’ Lepidochelys olivacea observed in March 2008, on the beach of Nueva Esperanza, Tumbes, Peru, The nest was in the upper area of the beach Nueva Esperanza (3º38’18.30”S - 80º36’23.25”W), had 88 eggs hatched and two unhatched (with embryo). One hatchling was found dead inside the nest (not the shell). 36 hatchlings were recovered briefly before entering the sea. The average of CCLn-s, CCW and weight were 4.37 ± 0.16 SD cm, 4.34 ± 0.08 SD cm and 17.73 ± 0.75 SD g, respectively. All hatchlings had reserves of yolk in absorption stage in the plastron. The hatching success and emergence success were 97.8% and 96.7%, respectively, considering the total clutch of 90 eggs. Apparently, all eggs had normal development and no evidence of predation.
Wing size and shape, expressed as wing loading and aspect ratio respectively, together with bill ... more Wing size and shape, expressed as wing loading and aspect ratio respectively, together with bill morphology are parameters that can reveal differences related to the foraging ecology of seabirds. Six species of booby (Sulidae) that inhabit the Pacific are the focus of this study: four mainly pelagic species, Masked Booby Sula dactylatra, Nazca Booby Sula granti, Red-footed Booby Sula sula and Brown Booby Sula leucogaster, and two coastal species, Blue-footed Booby Sula nebouxii and Peruvian Booby Sula variegata. Pelagic boobies showed segregation among species in body mass and relative bill size, and they differed in wing morphology (wing loading and aspect ratio) from the coastal boobies. The coastal Peruvian and Blue-footed Boobies are largely allopatric but overlap in northern Peru. In their area of sympatry, they showed evidence of character displacement in body size and in wing and bill morphology, which suggests that competition plays an important role in sympatry. This study improves our understanding of ecological interactions among Pacific boobies and of how selective pressures have shaped their ecomorphology and foraging behaviours.
Preliminary findings regarding black turtle (Chelonia mydas agassizii) occurrence in Lobos de Tie... more Preliminary findings regarding black turtle (Chelonia mydas agassizii) occurrence in Lobos de Tierra Island, Northern Peru showed that 95% and 5% of turtles were juveniles and sub-adults, respectively, with an overall mean curved carapace length of 57.5 ± 7 cm (26.0– 74.4 cm, n = 199). A total mean density of 180.4 turtles/km2 was found with highest densities found in bays and inlets located in the southeast. Inshore densities in shallow waters (< 1.5 m) were almost one order of magnitude greater than offshore at ~ 1.5 km. In addition, based on structured qualitative interviews with fishermen, sea turtle capture and consumption still exists in the island, though occasional and sporadic. Jellyfish (Chrysaora plocamia) and green algae (Ulva sp.) consumption plays an important role in black turtle aggregations in the island, where densities are quite high compared to other feeding grounds elsewhere. We conclude that Lobos de Tierra constitutes an important Peruvian feeding ground, with high black turtle aggregations, close to the northern limit of the cold Humboldt Current.
Se reporta el anidamiento de “tortuga pico de loro” Lepidochelys olivacea (Eschssholtz 1829) ocur... more Se reporta el anidamiento de “tortuga pico de loro” Lepidochelys olivacea (Eschssholtz 1829) ocurrido el 19 de marzo de 2008 en la playa de Nueva Esperanza, región Tumbes. Se detallan las características del nido así como las medidas morfológicas de 36 ejemplares neonatos (longitud curva del caparazón LCC, ancho curvo del caparazón ACC, longitud recta del caparazón LRC, ancho recto del caparazón ARC y peso total PT). El evento ocurrió dos días antes de luna llena. El nido estuvo ubicado cerca a la desembocadura de la Quebrada Charán, Nueva Esperanza (3º38’18,30” LS 80º36’23,25” LW), en una playa de arena de grano fino, con poca vegetación (grama salada) y a 5,92 m de la pleamar. Su profundidad fue de 0,38 m. La LCC promedio fue de 4,37 cm (SD = 0,16); y la del ACC, 4,34 cm (SD = 0,08). El PT de los ejemplares varió de 16,1 a 19,8 g, con promedio de 17,73 g. Existió un elevado nivel de correlación entre las variables ACC-LCC y ARC-LRC (r = 0,54 y 0,81; respectivamente). Este evento s...
This paper reports on the nest and hatchlings of ‘Olive Ridley turtle’ Lepidochelys olivacea obse... more This paper reports on the nest and hatchlings of ‘Olive Ridley turtle’ Lepidochelys olivacea observed in March 2008, on the beach of Nueva Esperanza, Tumbes, Peru, The nest was in the upper area of the beach Nueva Esperanza (3º38’18.30”S - 80º36’23.25”W), had 88 eggs hatched and two unhatched (with embryo). One hatchling was found dead inside the nest (not the shell). 36 hatchlings were recovered briefly before entering the sea. The average of CCLn-s, CCW and weight were 4.37 ± 0.16 SD cm, 4.34 ± 0.08 SD cm and 17.73 ± 0.75 SD g, respectively. All hatchlings had reserves of yolk in absorption stage in the plastron. The hatching success and emergence success were 97.8% and 96.7%, respectively, considering the total clutch of 90 eggs. Apparently, all eggs had normal development and no evidence of predation.
ABSTRACT This paper reports on the nest and hatchlings of ‘Olive Ridley turtle’ Lepidochelys oliv... more ABSTRACT This paper reports on the nest and hatchlings of ‘Olive Ridley turtle’ Lepidochelys olivacea observed in March 2008, on the beach of Nueva Esperanza, Tumbes, Peru, The nest was in the upper area of the beach Nueva Esperanza (3º38’18.30”S - 80º36’23.25”W), had 88 eggs hatched and two unhatched (with embryo). One hatchling was found dead inside the nest (not the shell). 36 hatchlings were recovered briefly before entering the sea. The average of CCLn-s, CCW and weight were 4.37 ± 0.16 SD cm, 4.34 ± 0.08 SD cm and 17.73 ± 0.75 SD g, respectively. All hatchlings had reserves of yolk in absorption stage in the plastron. The hatching success and emergence success were 97.8% and 96.7%, respectively, considering the total clutch of 90 eggs. Apparently, all eggs had normal development and no evidence of predation.
Wing size and shape, expressed as wing loading and aspect ratio respectively, together with bill ... more Wing size and shape, expressed as wing loading and aspect ratio respectively, together with bill morphology are parameters that can reveal differences related to the foraging ecology of seabirds. Six species of booby (Sulidae) that inhabit the Pacific are the focus of this study: four mainly pelagic species, Masked Booby Sula dactylatra, Nazca Booby Sula granti, Red-footed Booby Sula sula and Brown Booby Sula leucogaster, and two coastal species, Blue-footed Booby Sula nebouxii and Peruvian Booby Sula variegata. Pelagic boobies showed segregation among species in body mass and relative bill size, and they differed in wing morphology (wing loading and aspect ratio) from the coastal boobies. The coastal Peruvian and Blue-footed Boobies are largely allopatric but overlap in northern Peru. In their area of sympatry, they showed evidence of character displacement in body size and in wing and bill morphology, which suggests that competition plays an important role in sympatry. This study improves our understanding of ecological interactions among Pacific boobies and of how selective pressures have shaped their ecomorphology and foraging behaviours.
Preliminary findings regarding black turtle (Chelonia mydas agassizii) occurrence in Lobos de Tie... more Preliminary findings regarding black turtle (Chelonia mydas agassizii) occurrence in Lobos de Tierra Island, Northern Peru showed that 95% and 5% of turtles were juveniles and sub-adults, respectively, with an overall mean curved carapace length of 57.5 ± 7 cm (26.0– 74.4 cm, n = 199). A total mean density of 180.4 turtles/km2 was found with highest densities found in bays and inlets located in the southeast. Inshore densities in shallow waters (< 1.5 m) were almost one order of magnitude greater than offshore at ~ 1.5 km. In addition, based on structured qualitative interviews with fishermen, sea turtle capture and consumption still exists in the island, though occasional and sporadic. Jellyfish (Chrysaora plocamia) and green algae (Ulva sp.) consumption plays an important role in black turtle aggregations in the island, where densities are quite high compared to other feeding grounds elsewhere. We conclude that Lobos de Tierra constitutes an important Peruvian feeding ground, with high black turtle aggregations, close to the northern limit of the cold Humboldt Current.
Se reporta el anidamiento de “tortuga pico de loro” Lepidochelys olivacea (Eschssholtz 1829) ocur... more Se reporta el anidamiento de “tortuga pico de loro” Lepidochelys olivacea (Eschssholtz 1829) ocurrido el 19 de marzo de 2008 en la playa de Nueva Esperanza, región Tumbes. Se detallan las características del nido así como las medidas morfológicas de 36 ejemplares neonatos (longitud curva del caparazón LCC, ancho curvo del caparazón ACC, longitud recta del caparazón LRC, ancho recto del caparazón ARC y peso total PT). El evento ocurrió dos días antes de luna llena. El nido estuvo ubicado cerca a la desembocadura de la Quebrada Charán, Nueva Esperanza (3º38’18,30” LS 80º36’23,25” LW), en una playa de arena de grano fino, con poca vegetación (grama salada) y a 5,92 m de la pleamar. Su profundidad fue de 0,38 m. La LCC promedio fue de 4,37 cm (SD = 0,16); y la del ACC, 4,34 cm (SD = 0,08). El PT de los ejemplares varió de 16,1 a 19,8 g, con promedio de 17,73 g. Existió un elevado nivel de correlación entre las variables ACC-LCC y ARC-LRC (r = 0,54 y 0,81; respectivamente). Este evento s...
This paper reports on the nest and hatchlings of ‘Olive Ridley turtle’ Lepidochelys olivacea obse... more This paper reports on the nest and hatchlings of ‘Olive Ridley turtle’ Lepidochelys olivacea observed in March 2008, on the beach of Nueva Esperanza, Tumbes, Peru, The nest was in the upper area of the beach Nueva Esperanza (3º38’18.30”S - 80º36’23.25”W), had 88 eggs hatched and two unhatched (with embryo). One hatchling was found dead inside the nest (not the shell). 36 hatchlings were recovered briefly before entering the sea. The average of CCLn-s, CCW and weight were 4.37 ± 0.16 SD cm, 4.34 ± 0.08 SD cm and 17.73 ± 0.75 SD g, respectively. All hatchlings had reserves of yolk in absorption stage in the plastron. The hatching success and emergence success were 97.8% and 96.7%, respectively, considering the total clutch of 90 eggs. Apparently, all eggs had normal development and no evidence of predation.
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of this study: four mainly pelagic species, Masked Booby Sula dactylatra, Nazca Booby Sula granti, Red-footed Booby Sula sula and Brown Booby Sula leucogaster, and two coastal species, Blue-footed Booby Sula nebouxii and Peruvian Booby Sula variegata. Pelagic boobies showed segregation among species in body mass and relative bill size, and they differed in wing morphology (wing loading and aspect ratio) from the coastal boobies. The coastal Peruvian and Blue-footed Boobies are largely allopatric but overlap in northern Peru. In their area of sympatry, they showed evidence of character displacement in body size and in wing and bill morphology, which suggests that competition plays an important role in sympatry. This study improves our understanding of ecological interactions among Pacific boobies and of how selective pressures have shaped their ecomorphology and foraging behaviours.
that 95% and 5% of turtles were juveniles and sub-adults, respectively, with an overall mean curved carapace length of 57.5 ± 7 cm (26.0–
74.4 cm, n = 199). A total mean density of 180.4 turtles/km2 was found with highest densities found in bays and inlets located in the
southeast. Inshore densities in shallow waters (< 1.5 m) were almost one order of magnitude greater than offshore at ~ 1.5 km. In addition,
based on structured qualitative interviews with fishermen, sea turtle capture and consumption still exists in the island, though occasional
and sporadic. Jellyfish (Chrysaora plocamia) and green algae (Ulva sp.) consumption plays an important role in black turtle aggregations in
the island, where densities are quite high compared to other feeding grounds elsewhere. We conclude that Lobos de Tierra constitutes an
important Peruvian feeding ground, with high black turtle aggregations, close to the northern limit of the cold Humboldt Current.
of this study: four mainly pelagic species, Masked Booby Sula dactylatra, Nazca Booby Sula granti, Red-footed Booby Sula sula and Brown Booby Sula leucogaster, and two coastal species, Blue-footed Booby Sula nebouxii and Peruvian Booby Sula variegata. Pelagic boobies showed segregation among species in body mass and relative bill size, and they differed in wing morphology (wing loading and aspect ratio) from the coastal boobies. The coastal Peruvian and Blue-footed Boobies are largely allopatric but overlap in northern Peru. In their area of sympatry, they showed evidence of character displacement in body size and in wing and bill morphology, which suggests that competition plays an important role in sympatry. This study improves our understanding of ecological interactions among Pacific boobies and of how selective pressures have shaped their ecomorphology and foraging behaviours.
that 95% and 5% of turtles were juveniles and sub-adults, respectively, with an overall mean curved carapace length of 57.5 ± 7 cm (26.0–
74.4 cm, n = 199). A total mean density of 180.4 turtles/km2 was found with highest densities found in bays and inlets located in the
southeast. Inshore densities in shallow waters (< 1.5 m) were almost one order of magnitude greater than offshore at ~ 1.5 km. In addition,
based on structured qualitative interviews with fishermen, sea turtle capture and consumption still exists in the island, though occasional
and sporadic. Jellyfish (Chrysaora plocamia) and green algae (Ulva sp.) consumption plays an important role in black turtle aggregations in
the island, where densities are quite high compared to other feeding grounds elsewhere. We conclude that Lobos de Tierra constitutes an
important Peruvian feeding ground, with high black turtle aggregations, close to the northern limit of the cold Humboldt Current.