☆ 4.2 Article

Molecular phylogeny of the South American sheldgeese with implications for conservation of Falkland Islands (Malvinas) and continental populations of the Ruddy-headed Goose Chloephaga rubidiceps and Upland Goose C. picta

BIRD CONSERVATION INTERNATIONAL (2014)

Journal

BIRD CONSERVATION INTERNATIONAL

Volume 24, Issue 1, Pages 59-71

Publisher

CAMBRIDGE UNIV PRESS

DOI: 10.1017/S0959270913000178

Keywords

Funding

Institute of Arctic Biology at the University of Alaska Fairbanks
Frank M. Chapman Fund at the American Museum of Natural History
NSF [DEB-0444748, IOS-0949439]
Division Of Integrative Organismal Systems
Direct For Biological Sciences [0949439] Funding Source: National Science Foundation

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Abstract

Sheldgeese of the genus Chloephaga are waterfowl (Anatidae) endemic to mainland South America and the Falkland Islands (Malvinas). Continental populations of three species C. picta, C. poliocephala, and C. rubidiceps breed in Patagonia and Tierra del Fuego and migrate northwards to winter in central Argentina and Chile. These continental populations have declined by > 50% in the past 30 years due to direct hunting to control crop damage and by the introduction of the grey fox Dusicyon griseus to their breeding grounds in Tierra del Fuego. The continental population of C. rubidiceps is critically endangered, estimated to be < 1,000 individuals. While no historic population size estimates exist for C. rubidiceps in its wintering grounds, the breeding population in Tierra del Fuego was estimated to number several thousand individuals in the 1950s. In contrast, the C. rubidiceps population in the Falkland Islands (Malvinas) is non-migratory and stable with > 42,000 individuals, as is the Falkland Islands (Malvinas) population of C. picta leucoptera with > 138,000 individuals. Here we use sequence data from the mitochondrial DNA control region to quantify genetic divergence between insular and continental populations of these two species of sheldgeese. Chloephaga rubidiceps and C. picta showed significant intraspecific differentiation of 1.0% and 0.6%, respectively. In both cases, mainland and insular populations were reciprocally monophyletic and did not share mtDNA haplotypes. These results suggest that the insular and continental populations of C. rubidiceps and C. picta are genetically distinct and that female-mediated gene flow is restricted. We recommend a reevaluation of the threat category status of the continental C. rubidiceps population, under IUCN guidelines. It is necessary to implement urgent actions for the conservation of this critically endangered population. degrees

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Automated satellite remote sensing of giant kelp at the Falkland Islands (Islas Malvinas)

Henry F. Houskeeper, Isaac S. Rosenthal, Katherine C. Cavanaugh, Camille Pawlak, Laura Trouille, Jarrett E. K. Byrnes, Tom W. Bell, Kyle C. Cavanaugh

Summary: Giant kelp populations, which are essential for productive coastal ecosystems, are vulnerable to changing climate conditions and human impacts. This study presents two approaches for automating the detection of giant kelp using satellite imagery and applies them to the Falkland Islands. The results show no evidence of long-term change in giant kelp canopy area, but recent declines should be carefully monitored.

PLOS ONE (2022)