Markham's Storm-Petrel Oceanodroma markhami

Fernando Medrano, Jacob Drucker, and Alvaro Jaramillo
Version: 2.0 — Published October 29, 2020

Demography and Populations

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Measures of Breeding Activity

No information available.

Life Span and Survivorship

No information available.

Disease and Body Parasites

Body Parasites

The generalist stick-tight flea Hectopsylla psittaci was described for this species from the Arica colony (21). Furthermore, the presence of Philoceanus amadoni has been described for birds grounding in Lima (22), which also were recorded in Chile (R. Palma comm. pers.). In the nests, up to 60% of the younger nestlings can have ectoparasites, while the number increases to 100% in older fledglings (13).

Causes of Mortality

Known causes of direct mortality are light pollution (11, 23), natural predation by Sechura fox and South American gray fox (13, 14), and the predation of fledglings mediated by the light pollution by Peregrine falcon, Turkey vulture, dogs, ants (11) and Burrowing owls (20).

Population Spatial Metrics

Offshore, subadults tend to forage further offshore (greater than 500 km from the coast), while adults are found in greater numbers inshore (less than 200 km from the coast; 15).

Population Status


The first population size estimates are based on at-sea counts. In the austral spring, the population was estimated to be 700,000–1,000,000 individuals, and in austral autumn, the population was estimated to be 1,000,000–1,600,000 (15). However, estimates made at the colonies are much smaller, with approximately 150,000 mature individuals, comprising 58,000 breeding pairs (55,300 in Chile and 2,700 in Paracas; 11, 13, 14). Searching for new colonies in southern Peru is needed, which could increase these numbers.


Population trends are unknown, and could be studied using autonomous recorders.

Population Regulation

No information on the differential influence of threats.

Recommended Citation

Medrano, F., J. Drucker, and A. Jaramillo (2020). Markham's Storm-Petrel (Oceanodroma markhami), version 2.0. In Birds of the World (T. S. Schulenberg, S. M. Billerman, and B. K. Keeney, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.maspet.02