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Rollandia microptera

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA AVES PODICIPEDIFORMES PODICIPEDIDAE

Scientific Name: Rollandia microptera
Species Authority: (Gould, 1868)
Common Name(s):
English Titicaca Grebe, Short-winged Grebe
Spanish Titikakataucher, Zampullín del Titicaca
Synonym(s):
Rollandia micropterum micropterum Collar and Andrew (1988)
Rollandia micropterum micropterum Stotz et al. (1996)

Assessment Information [top]

Red List Category & Criteria: Endangered A2acde+3cde+4acde ver 3.1
Year Published: 2012
Date Assessed: 2012-05-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Aranibar-Rojas, H., Engblom, G., Fjeldså, J. & Hennessey, A.
Facilitator/Compiler(s): Benstead, P., Pilgrim, J., Sharpe, C J, Symes, A., Wege, D.
Justification:
This flightless grebe is listed as Endangered because it has suffered from very rapid population reductions. The population is small enough that, if declines continue, this species may soon need uplisting to Critically Endangered.

Geographic Range [top]

Range Description: Rollandia microptera is endemic to open, freshwater lakes on the altiplano of Peru and Bolivia. It occurs from lakes Arapa and Umayo in south-eastern Peru, through Lake Titicaca into adjacent Bolivia, and along the Desaguadero River to Lakes Uru-uru and Poopó (O'Donnell and Fjeldså 1997). Temporary populations occur on smaller adjacent lakes in years when Lake Titicaca floods (O'Donnell and Fjeldså 1997). Surveys in the 1970s and 1980s led to population estimates of between 2,000-10,000 individuals, with at least 1,147 on Lake Umayo alone in 1986 (Engblom et al. 2001). Surveys in 2001 found just four individuals on Lake Umayo, and 156 adults on Lake Arapa, whereas 215 adults and 45 young were recorded from 16 lakes in the Peruvian range (Engblom et al. 2001). Counts during 1997 in Bolivia found a total of 100 individuals (Engblom et al. 2001). Further declines were indicated during a brief follow-up survey in 2003 (G. Engblom in litt. 2003), but surveys of Lake Titicaca in 2003 found a total of 2,583 individuals, which was thought likely to be an underestimate of the total population on the lake. In 2007 preliminary census data found 1,254 individuals in the wet season (H. Aranibar-Rojas in litt. 2007). A census on a small section of the Río Laka Jahuira (at Paso Julian) in 2004 found 138 mature individuals, and further surveys are needed along the entire eastern section of the river to confirm the size of this subpopulation (Konter 2006). The total global population is estimated at 1,600 mature individuals (Martinez et al. 2006).

Countries:
Native:
Bolivia, Plurinational States of; Peru
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Martinez et al. (2006) estimated around 1,600 mature individuals by summing the adults counted in their study of Lake Titicaca in 2003 and those adults counted elsewhere in the Titicaca watershed by Engblom et al. and Rocha et al. 2,583 individuals of all ages were counted on Lake Titicaca itself which combined with smaller numbers elsewhere in the watershed represents a higher population than previously estimated.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: It is a social species, but usually solitary when feeding (O'Donnell and Fjeldså 1997). It breeds in wide reed-marshes composed primarily of tule-rushes (Schoenoplectus tatora) in places with easy access to open water, or in open view in floating water weeds (O'Donnell and Fjeldså 1997). Fish of the genus Orestias comprise up to 94% of prey as measured by biomass (Martinez et al. 2006). The species is an opportunistic breeder and reproduction occurs throughout the year (Martinez et al. 2006).

Systems: Freshwater

Threats [top]

Major Threat(s): Since at least the early 1990s, there has been unregulated use of 80-100 m long monofilament gill-nets in lakes throughout its range. Confirmation that birds are drowned in these gill-nets comes from local fishermen and direct observations - one study found 100% of Aymara fishermen questioned had found grebes drowned as bycatch in their nets (Martinez et al. 2006), 45% of the fishermen finding such birds on a weekly basis. A rapid evaluation with two fishermen in 2005 found one dead grebe per net/fisherman/day (B. Hennessey in litt. 2005) and studies in 2006-2007 found 2.7 individuals per fisherman/month. Local, natural fluctuations in water levels seriously impact breeding success (Engblom et al. 2001). Lakes Poopó and Uru Uru are threatened by chemical contamination from the heavy metal mining industry (Konter 2006). Lake ecosystems in the area are being affected negatively by the introduction of exotic fish such as Basilicthys bonariensis and Onchorhynchus mykiss (J. Fjeldså in litt. 2003, Martinez et al. 2006). Uro communities have recently started hunting birds, including Titicaca Grebes, on a commercial basis to sell at market (Martinez et al. 2006), and eggs may be harvested for food. Harvesting of tule-beds has taken place for centuries but human population growth and market demand for cattle may be changing harvesting patterns and posing a threat to the grebes' breeding habitat (Martinez et al. 2006). In particular burning of tule-rushes during the grebes' peak breeding period may be affecting reproduction (B. Hennessey in litt. 2005). Tourism on Lake Titicaca has increased rapidly over the past decade, and disturbance by boats may be a threat to reproductive success (H. Aranibar-Rojas in litt. 2007). Alteration of the rio Desaguadero watercourse for extensive farming may affect the aquatic ecosystems of Lakes Poopó and Uru Uru in the future (H. Aranibar-Rojas in litt. 2007). Organic and inorganic waste from cities such as Alto is dumped in large quantities in some parts of Lake Titicaca (H. Aranibar-Rojas in litt. 2007).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
Although some areas are protected, there is currently no action being taken to protect the species or to mitigate the threats it faces.

Conservation Actions Proposed
Promote awareness of the plight of the species amongst local communities and encourage involvement in its conservation. Formulate a Species Action Plan. Investigate alternatives to gill-netting along reedbed edges and scaring methods to reduce bycatch. Implement a monitoring programme using a standardised survey technique to assess declines. Survey Río Laka Jahuira to confirm whether species present along the whole section of the river and whether there is interchange with birds on Lake Poopó (Konter 2006). Identify areas with large numbers of breeding territories, good breeding habitat and minimal fishing nets and investigate possibility of designating these as net-free harvest refugia for Orestias spp (Martinez et al. 2006). Study potential effects of organic and inorganic waste on the species and lake ecosystem (H. Aranibar-Rojas in litt. 2007). Develop plans to mitigate current and future diversions of water bodies such as Lakes Uru Uru and Poopó (H. Aranibar-Rojas in litt. 2007). Assess genetic variability (H. Aranibar-Rojas in litt. 2007). Study effects of increased tourism and if necessary develop a management plan to reduce disturbance from tourist boats (H. Aranibar-Rojas in litt. 2007).


Citation: BirdLife International 2012. Rollandia microptera. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 02 September 2014.
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