Status of Crested Penguin (Eudyptes spp.) populations on three islands in Southern Chile

Oehler, David A.; Pelikan, Steve; Fry, W Roger; Weakley, Leonard A.; Kusch, Alejandro; Marin, Manuel

doi:10.1676/07-108.1

Cited by 14 publications

(16 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Bingham & Mejias (1999) mentioned the same estimation number as Venegas (1998). We visited Isla Noir on five occasions and estimated (Oehler et al, 2008) a population of 158,200 (139,716 -176,700) breeding pairs, a considerable larger number than previous estimated. The next colony to the south Clark et al, (1992) reported 10,800 breeding pairs from at least 3 different sites around the island.…”

Section: Breeding Distributionmentioning

confidence: 93%

Distribution, Status and Natural History Notes on Rockhopper Penguins (Eudyptes Chrysocome) in Chile

Marín¹,

Oehler²,

Kusch³

2013

Anales Instituto Patagonia (Chile)

Self Cite

View full text Add to dashboard Cite

Section: Breeding Distributionmentioning

confidence: 93%

Distribution, Status and Natural History Notes on Rockhopper Penguins (Eudyptes Chrysocome) in Chile

Marín¹,

Oehler²,

Kusch³

2013

Anales Instituto Patagonia (Chile)

Self Cite

View full text Add to dashboard Cite

“…The decline that was occurring for the rockhopper penguins at the Antipodes Islands appears to have lessened and possibly halted, as is the case with other eastern rockhopper populations (Baylis, Wolfaardt, Crofts, Pistorius, & Ratcliffe, ; Dehnhard et al, ; Kirkwood et al, ; Morrison et al, ; Oehler et al, ). The widespread and largely simultaneous declines of rockhopper penguin populations throughout their range were thought to be the result of a single shared cause.…”

Section: Discussionmentioning

confidence: 95%

Significant decline of endangered Antipodes Island penguins: Is extreme weather an additional impact?

Chilvers

Hiscock

2019

Aquatic Conservation

View full text Add to dashboard Cite

Worldwide, most crested penguin species (Eudyptes spp.) are in decline. New Zealand's subantarctic Antipodes Islands are of international significance for erect‐crested (Eudyptes sclateri) and rockhopper (Eudyptes filholi) penguins. Between 1995 and 2011, a 23% decline was recorded in the two penguin species on the Antipodes Islands. In October 2014, nest abundance counts on Antipodes Island were undertaken to determine if this decline was continuing, particularly in light of a significant storm event that hit the Antipodes area in January 2014 causing massive landslides during the penguin breeding season. All penguin colonies ground counted in 2011 were preferentially ground counted in 2014 or, if time or weather did not allow, were checked with binoculars to confirm colony presence or absence. Seventy‐three per cent of the colonies and the equivalent of 82% of all nests counted in 2011 were recounted in 2014. Overall, there was a 19% decline in erect‐crested penguin nests between 2011 and 2014. Rockhopper penguins showed a slight increase (2.6%). Landslides affected 11% of the main islands’ land area and 44% of surveyed nesting colonies. Erect‐crested penguin colonies with approximately 75% or greater of their area impacted by landslides showed a significantly greater decline than unaffected or only partially impacted colonies. Landslides showed a minimal effect on rockhopper nest numbers. There continues to be a significant decline of erect‐crested penguins at the Antipodes Islands. An increasing occurrence of extreme weather events are predicted with climate change and have the potential to increase land‐based flooding and landslides, adding additional impacts to terrestrial breeding marine species. Greater understanding of what is causing erect‐crested penguin decline is needed to prevent this endangered species from extinction.

show abstract

“…Site-specific effects on colony size due to poorquality prey conditions have been recorded within adjacent Magellanic penguin colonies (Forero et al 2002, Wilson et al 2005) and may be the reason for other concurrent diverging colony size changes in other penguin populations elsewhere (Hinke et al 2007, Ghys et al 2008, Oehler et al 2008.…”

Section: Low Reproductive Success and Population Declinementioning

confidence: 99%

Site-specific reproductive failure and decline of a population of the Endangered yellow-eyed penguin: a case for foraging habitat quality

King¹,

Harper²,

Wright³

et al. 2012

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Sub-populations within species can exhibit differing population growth trajectories in relation to one another depending on various environmental factors. In threatened species, negative population growth in some sub-populations can ultimately cause the demise of the species; therefore, understanding causal factors of population change is critical to inform management aimed at reversing population declines. Feral house cats Felis catus are potential predators of Endangered yellow-eyed penguins Megadyptes antipodes and were considered the principal causal factor in the species' decline on Stewart Island/Rakiura, New Zealand. The number of yellow-eyed penguins breeding on Stewart Island is low relative to the number on close outlying islands, where cats are absent, and a census had recorded few juveniles on Stewart Island, suggesting poor reproductive success. Yellow-eyed penguin breeding attempts on the northern coast of Stewart Island and outlying islands were monitored for 5 yr, but predation by cats was not evident. Instead, disease, probably aggravated by starvation and poor dietary provisioning, was found to be a significant cause of chick mortality on Stewart Island. Reproductive success was consistently low there (0−33%), in contrast to outlying islands (27−76%). Little recruitment was recorded on Stewart Island, and the number of breeding pairs on the northern coast of Stewart Island declined by 27% between 1999 and 2008. Factors unique to the north coast of Stewart Island are believed to be adversely affecting nesting yellow-eyed penguins, as a similar decline was not recorded elsewhere on the island or on outlying islands.KEY WORDS: Megadyptes antipodes · Feral cat · Population decline · Breeding success · Chick mortality · Starvation · Disease · 'Junk-food' hypothesis Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 467: [233][234][235][236][237][238][239][240][241][242][243][244] 2012 ited distribution (IUCN 2008) and decreasing numbers (ca. 1600 to 1800 pairs, D. Houston pers. comm.). It is a tall, distinctive, penguin of a monotypic genus and species, endemic to the southern South Island and Stewart Island/Rakiura, New Zealand, and its sub-Antarctic islands (Marchant & Higgins 1990; our Fig. 1). Approximately 600 to 700 pairs breed in loose colonies around southern New Zealand, which are both geographically and genetically distinct from their sub-Antarctic conspecifics (Boessenkool et al. 2009). Most breeding areas in the southern South Island are monitored each year, and the population estimate for these areas (470 pairs) is considered reasonably accurate. Historical estimates for Stewart Island have varied from 470 to 600 pairs (McKinlay 2001) to 220 to 392 pairs (Darby 2003), while a recent survey found 178 pairs (Massaro & Blair 2003), suggesting a decline. Factors known to contribute to population decline in yelloweyed penguins include fishery by-catch (Darby & Dawson 2000) and human disturbance (Ellenberg et al. 2007), although dise...

show abstract

Status of Crested Penguin (Eudyptes spp.) populations on three islands in Southern Chile

Cited by 14 publications

References 8 publications

Distribution, Status and Natural History Notes on Rockhopper Penguins (Eudyptes Chrysocome) in Chile

Distribution, Status and Natural History Notes on Rockhopper Penguins (Eudyptes Chrysocome) in Chile

Significant decline of endangered Antipodes Island penguins: Is extreme weather an additional impact?

Site-specific reproductive failure and decline of a population of the Endangered yellow-eyed penguin: a case for foraging habitat quality

Contact Info

Product

Resources

About