Demography and Populations

Age at First Breeding

Information needed.

Intervals Between Breeding

Information needed.

Clutch Size and Number of Clutches per Season

Little known. It appears to lay a single clutch per season, with two eggs (28 Luzuriaga Neira, N., D. Cuichán, M. da Costa, and N. Reyes (2021). Observations on the breeding biology of the Andean Ibis (Theristicus branickii) in Ecuador. Ornithology Research 29(1):22-28 Close ).

Annual and Lifetime Reproductive Success

Little is known about annual reproductive success and nothing about lifetime reproductive success. In one study in Ecuador, hatching success was 88%, while the fledging success (percent of successfully hatched eggs that resulted in fledged young) was 57% (n = 4 nests; 28 Luzuriaga Neira, N., D. Cuichán, M. da Costa, and N. Reyes (2021). Observations on the breeding biology of the Andean Ibis (Theristicus branickii) in Ecuador. Ornithology Research 29(1):22-28 Close ). It appeared that the nestlings of one nest were predated, while one nestling from another nest appeared to have fallen from the nest and died (28 Luzuriaga Neira, N., D. Cuichán, M. da Costa, and N. Reyes (2021). Observations on the breeding biology of the Andean Ibis (Theristicus branickii) in Ecuador. Ornithology Research 29(1):22-28 Close ).

Number of Broods Normally Reared per Season

Likely only a single brood is reared per season, but information needed to confirm this.

Proportion of Total Females that Rear ≥ One Brood to Nest-Leaving

Information needed.

Information needed.

Information needed.

Exposure

Information needed. One nestling appeared to have died after it fell from its nest during as study in Ecuador (28 Luzuriaga Neira, N., D. Cuichán, M. da Costa, and N. Reyes (2021). Observations on the breeding biology of the Andean Ibis (Theristicus branickii) in Ecuador. Ornithology Research 29(1):22-28 Close ).

Depredation

Information needed. Its relationship with Carunculated Caracara in Ecuador is not clear; caracaras have been observed chasing and pursuing Andean Ibis (27 West, B. (2014). New observations of the Andean Ibis (Theristicus branickii, Threskiornithidae): Distribution, movements, and behavior near Volcan Antisana. Independent Study Project (ISP) Collection. 2019. Close ), but whether this is related to predation is not known.

Disease

Information needed.

Direct Human Impacts

The only known cause is hunting in Ecuador (31 Granizo, T., Editor (2002). Libro Rojo de las Aves del Ecuador. SIMBIOE, Conservation International, UICN, Ministerio del Medio Ambiente & EcoCiencia, Quito, Ecuador. Close ). Nothing else is known.

Individual Distance

Very little information. Four nests at Antisana Ecological Reserve, Ecuador were between 3–10 km from each other (28 Luzuriaga Neira, N., D. Cuichán, M. da Costa, and N. Reyes (2021). Observations on the breeding biology of the Andean Ibis (Theristicus branickii) in Ecuador. Ornithology Research 29(1):22-28 Close ).

Territory Size

Information needed.

Home Range Size

Information needed.

Numbers

Mostly unknown.

Ecuador

In the Napo province there were estimates of 85, 94, and 134 individuals in 2016, 2017, and 2018 respectively (32 Naveda-Rodríguez, A., T. Santander, V. Utreras, and G. Zapata-Ríos (2020). Estimating the Abundance of Andean Ibis (Theristicus branickii) in the High Andes of Northern Ecuador. Tropical Conservation Science 13:1-8 Close ).

Peru

Unknown, but based on the densities from Ecuador, and the large area occupied by the species in this country, the population seems to exceed several thousand individuals.

Chile

The population in Chile might not exceed 200 individuals (FM, personal observation).

Trends

Apparently declining, with the rate of decline thought to be approaching 30% over three generations (29 years).

Information needed.