Nutrient content and morphological features of alien fruits consumed by dusky-legged guan (Penelope obscura obscura) in the lower delta of the Parana River

MALZOF, SILVINA LAURA; JUÁREZ, ÁNGELA; STEAVO, ANA; STUCHI, VIVIANA; QUINTANA, RUBEN DARIO

Campos do Jordao

Congreso; 25th International Ornithological Congress; 2010

Comité ad hoc del XXV IOC

Dusky-legged guan (Penelope obscura obscura), a threatened species in Argentina, is the southernmost member of the Cracid Family and the Delta of the Paraná River is its distribution boundary. This eco-region has been modified by human activities since the middle of the XIX Century, having a strong impact on the original habitat of this guan species. At present, the guan diet is composed mainly of alien fruits. We compared physical properties and lipids, carbohydrates, proteins, water and minerals contents of alien fruit in each season: Phytollaca Americana (PA), Ligustrum lucidum (LL), Ligustrum sinense (LS), Rubus sp. (RS), Morus nigra (MN), and M. alba (MA). All these fruits have red, purpure or black colours and the size of fleshy fruits were in average width and length between (0.42 x 0.42 mm to 1.90 x 1.20 mm). Their water content varied between 11% for LS and 90% for RS. Concentrations of sugar were higher in fruits eaten in spring and summer than the fruits eaten in fall and winter. The averages for fall-winter were (7.86 ± 8.73% to 35.02 ± 11.9%); for spring-summer (96 ± 3.13% to 44.65 ± 5.89%). The averages content of lipids was of 8.37 ± 3.17% spring-summer to 8.64 ± 3.83 for fall-winter. The average content of proteins was 0.4 ± 0.01% for fall-winter and 2.75 ± 0.77 % for spring-summer. The energy value of fruits varied from 1.74 to 2.17 Kcal/mg in fall and winter and from 2.44 to 2.38 Kcal/mg for spring and summer, respectively. We consider that determination of nutritional contents of the consumed alien fruits by dusky-legged guan, not only contribute with basic data on the nutritional quality of this kind of food for this species but also with information which could be a useful tool for identifying key food resources and habitat types for the conservation of this and another bird species in this ecoregion.Penelope obscura obscura), a threatened species in Argentina, is the southernmost member of the Cracid Family and the Delta of the Paraná River is its distribution boundary. This eco-region has been modified by human activities since the middle of the XIX Century, having a strong impact on the original habitat of this guan species. At present, the guan diet is composed mainly of alien fruits. We compared physical properties and lipids, carbohydrates, proteins, water and minerals contents of alien fruit in each season: Phytollaca Americana (PA), Ligustrum lucidum (LL), Ligustrum sinense (LS), Rubus sp. (RS), Morus nigra (MN), and M. alba (MA). All these fruits have red, purpure or black colours and the size of fleshy fruits were in average width and length between (0.42 x 0.42 mm to 1.90 x 1.20 mm). Their water content varied between 11% for LS and 90% for RS. Concentrations of sugar were higher in fruits eaten in spring and summer than the fruits eaten in fall and winter. The averages for fall-winter were (7.86 ± 8.73% to 35.02 ± 11.9%); for spring-summer (96 ± 3.13% to 44.65 ± 5.89%). The averages content of lipids was of 8.37 ± 3.17% spring-summer to 8.64 ± 3.83 for fall-winter. The average content of proteins was 0.4 ± 0.01% for fall-winter and 2.75 ± 0.77 % for spring-summer. The energy value of fruits varied from 1.74 to 2.17 Kcal/mg in fall and winter and from 2.44 to 2.38 Kcal/mg for spring and summer, respectively. We consider that determination of nutritional contents of the consumed alien fruits by dusky-legged guan, not only contribute with basic data on the nutritional quality of this kind of food for this species but also with information which could be a useful tool for identifying key food resources and habitat types for the conservation of this and another bird species in this ecoregion.Phytollaca Americana (PA), Ligustrum lucidum (LL), Ligustrum sinense (LS), Rubus sp. (RS), Morus nigra (MN), and M. alba (MA). All these fruits have red, purpure or black colours and the size of fleshy fruits were in average width and length between (0.42 x 0.42 mm to 1.90 x 1.20 mm). Their water content varied between 11% for LS and 90% for RS. Concentrations of sugar were higher in fruits eaten in spring and summer than the fruits eaten in fall and winter. The averages for fall-winter were (7.86 ± 8.73% to 35.02 ± 11.9%); for spring-summer (96 ± 3.13% to 44.65 ± 5.89%). The averages content of lipids was of 8.37 ± 3.17% spring-summer to 8.64 ± 3.83 for fall-winter. The average content of proteins was 0.4 ± 0.01% for fall-winter and 2.75 ± 0.77 % for spring-summer. The energy value of fruits varied from 1.74 to 2.17 Kcal/mg in fall and winter and from 2.44 to 2.38 Kcal/mg for spring and summer, respectively. We consider that determination of nutritional contents of the consumed alien fruits by dusky-legged guan, not only contribute with basic data on the nutritional quality of this kind of food for this species but also with information which could be a useful tool for identifying key food resources and habitat types for the conservation of this and another bird species in this ecoregion.sp. (RS), Morus nigra (MN), and M. alba (MA). All these fruits have red, purpure or black colours and the size of fleshy fruits were in average width and length between (0.42 x 0.42 mm to 1.90 x 1.20 mm). Their water content varied between 11% for LS and 90% for RS. Concentrations of sugar were higher in fruits eaten in spring and summer than the fruits eaten in fall and winter. The averages for fall-winter were (7.86 ± 8.73% to 35.02 ± 11.9%); for spring-summer (96 ± 3.13% to 44.65 ± 5.89%). The averages content of lipids was of 8.37 ± 3.17% spring-summer to 8.64 ± 3.83 for fall-winter. The average content of proteins was 0.4 ± 0.01% for fall-winter and 2.75 ± 0.77 % for spring-summer. The energy value of fruits varied from 1.74 to 2.17 Kcal/mg in fall and winter and from 2.44 to 2.38 Kcal/mg for spring and summer, respectively. We consider that determination of nutritional contents of the consumed alien fruits by dusky-legged guan, not only contribute with basic data on the nutritional quality of this kind of food for this species but also with information which could be a useful tool for identifying key food resources and habitat types for the conservation of this and another bird species in this ecoregion.. All these fruits have red, purpure or black colours and the size of fleshy fruits were in average width and length between (0.42 x 0.42 mm to 1.90 x 1.20 mm). Their water content varied between 11% for LS and 90% for RS. Concentrations of sugar were higher in fruits eaten in spring and summer than the fruits eaten in fall and winter. The averages for fall-winter were (7.86 ± 8.73% to 35.02 ± 11.9%); for spring-summer (96 ± 3.13% to 44.65 ± 5.89%). The averages content of lipids was of 8.37 ± 3.17% spring-summer to 8.64 ± 3.83 for fall-winter. The average content of proteins was 0.4 ± 0.01% for fall-winter and 2.75 ± 0.77 % for spring-summer. The energy value of fruits varied from 1.74 to 2.17 Kcal/mg in fall and winter and from 2.44 to 2.38 Kcal/mg for spring and summer, respectively. We consider that determination of nutritional contents of the consumed alien fruits by dusky-legged guan, not only contribute with basic data on the nutritional quality of this kind of food for this species but also with information which could be a useful tool for identifying key food resources and habitat types for the conservation of this and another bird species in this ecoregion.LS and 90% for RS. Concentrations of sugar were higher in fruits eaten in spring and summer than the fruits eaten in fall and winter. The averages for fall-winter were (7.86 ± 8.73% to 35.02 ± 11.9%); for spring-summer (96 ± 3.13% to 44.65 ± 5.89%). The averages content of lipids was of 8.37 ± 3.17% spring-summer to 8.64 ± 3.83 for fall-winter. The average content of proteins was 0.4 ± 0.01% for fall-winter and 2.75 ± 0.77 % for spring-summer. The energy value of fruits varied from 1.74 to 2.17 Kcal/mg in fall and winter and from 2.44 to 2.38 Kcal/mg for spring and summer, respectively. We consider that determination of nutritional contents of the consumed alien fruits by dusky-legged guan, not only contribute with basic data on the nutritional quality of this kind of food for this species but also with information which could be a useful tool for identifying key food resources and habitat types for the conservation of this and another bird species in this ecoregion.± 8.73% to 35.02 ± 11.9%); for spring-summer (96 ± 3.13% to 44.65 ± 5.89%). The averages content of lipids was of 8.37 ± 3.17% spring-summer to 8.64 ± 3.83 for fall-winter. The average content of proteins was 0.4 ± 0.01% for fall-winter and 2.75 ± 0.77 % for spring-summer. The energy value of fruits varied from 1.74 to 2.17 Kcal/mg in fall and winter and from 2.44 to 2.38 Kcal/mg for spring and summer, respectively. We consider that determination of nutritional contents of the consumed alien fruits by dusky-legged guan, not only contribute with basic data on the nutritional quality of this kind of food for this species but also with information which could be a useful tool for identifying key food resources and habitat types for the conservation of this and another bird species in this ecoregion.± 3.17% spring-summer to 8.64 ± 3.83 for fall-winter. The average content of proteins was 0.4 ± 0.01% for fall-winter and 2.75 ± 0.77 % for spring-summer. The energy value of fruits varied from 1.74 to 2.17 Kcal/mg in fall and winter and from 2.44 to 2.38 Kcal/mg for spring and summer, respectively. We consider that determination of nutritional contents of the consumed alien fruits by dusky-legged guan, not only contribute with basic data on the nutritional quality of this kind of food for this species but also with information which could be a useful tool for identifying key food resources and habitat types for the conservation of this and another bird species in this ecoregion.± 0.01% for fall-winter and 2.75 ± 0.77 % for spring-summer. The energy value of fruits varied from 1.74 to 2.17 Kcal/mg in fall and winter and from 2.44 to 2.38 Kcal/mg for spring and summer, respectively. We consider that determination of nutritional contents of the consumed alien fruits by dusky-legged guan, not only contribute with basic data on the nutritional quality of this kind of food for this species but also with information which could be a useful tool for identifying key food resources and habitat types for the conservation of this and another bird species in this ecoregion.