Mrs. Moreau's Warbler Scepomycter winifredae Scientific name definitions

Flemming P. Jensen
Version: 2.1 — Published March 3, 2023

Demography and Populations


The population biology of the Mrs. Moreau's Warbler is poorly known, with no information on nest success, longevity, survivorship, or population regulation. No formal surveys to quantify abundance have been undertaken and only qualitative population estimates have been made. It is patchily distributed within its range, but can be locally fairly common in the Uluguru Mountains (23, 24), and locally common to moderately frequent in the Ukaguru Mountains (26, 27). In the Rubeho Mountains, it seems to be very local, and is so far only recorded from near the eastern ridge of Ukwiva Forest (5). BirdLife International has estimated the total population at 500‒1,500 individuals (see Population Status).

Measures of Breeding Activity

Information needed.

Life Span and Survivorship

Information needed.

Disease and Body Parasites

Information needed.

Causes of Mortality

Information needed.

Population Spatial Metrics

Individual Distance

Information needed.

Territory Size

Information needed. In the Uluguru Mountains, in areas with high density of pairs there were generally 200‒300 m between territory centers (24).

Home Range Size

Information needed.

Population Status


Information needed. No survey data are available to generate quantitative estimates of density and population size.

In the Uluguru Mountains, reported to be locally fairly common based on fieldwork in 1993 (24). Since this mountain range holds ca. 120 km2 of montane forest (N. Burgess in litt. 2007, 2012 in 34) it likely supports the largest population of this species.

In the Ukaguru Mountains, it is known only from Mamiwa-Kisara North Forest Reserve (8,203 ha) (35), where most of the fieldwork in these mountains has occurred. There are no population estimates for the Ukaguru Mountains, but the species was found to be moderately frequent at the forest reserve in the early 1990s (27). However, the amount of habitat within the species' altitude range is limited at Mamiwa-Kisara North Forest Reserve (35), so the population there is presumed to be small.

In the Rubeho Mountains, it has only been recorded from the humid eastern edge of Ukwiva Forest Reserve (54,635 ha), while surveys in Mafwemiro and Mangalisa forests did not detect the species (5). The Ukwiva population could number anywhere from a few hundred to a few thousand mature individuals (5).

BirdLife International estimated the total population at 500–1,500 individuals based on an estimate by L. Hansen (L. Hansen in litt. 2016 in 34) which roughly equates to 330–1,000 mature individuals (34). This estimate seems low since the number of individuals in Rubeho alone was believed to be at least a few hundred (5).


No quantitative estimates are available, but the population is believed to be experiencing a decline due to ongoing habitat loss and degradation.

Population Regulation

Information needed.

Recommended Citation

Jensen, F. P. (2023). Mrs. Moreau's Warbler (Scepomycter winifredae), version 2.1. In Birds of the World (P. G. Rodewald, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.mrmwar1.02.1