ACAP Latest News

Read about recent developments and findings in procellariiform science and conservation relevant to the Agreement on the Conservation of Albatrosses and Petrels in ACAP Latest News.

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MacGillivray’s Prion predicted to become extinct if predatory House Mice are not eradicated on Gough Island

Macgillivrays Prion Prion Cave Gough Chris Jones

MacGillivray’s Prion in Prion Cave, Gough Island; photograph by Chris Jones

Chris Jones (RSPB Centre for Conservation Science, Royal Society for the Protection of Birds, Cambridge, United Kingdom) and colleagues have published in the journal Animal Conservation on the very poor breeding success of MacGillivray’s Prion Pachyptila macgillivrayi on Gough Island due to depredations by introduced House Mice Mus musculus.

The paper’s abstract follows:

“Petrels (Procellariidae) are a highly diverse family of seabirds, many of which are globally threatened due to the impact of invasive species on breeding populations. While predation by invasive cats and rats has led to the extinction of petrel populations, the impact of invasive house mice Mus musculus is slower and less well documented. However, mice impact small burrow‐nesting species such as MacGillivray’s prion Pachyptila macgillivrayi, a species classified as endangered because it has been extirpated on islands in the Indian Ocean by introduced rodents. We use historic abundance data and demographic monitoring data from 2014 to 2020 to predict the population trajectory of MacGillivray’s prion on Gough Island with and without a mouse eradication using a stochastic integrated population model. Given very low annual breeding success (0.01 fledglings per breeding pair in ‘poor’ years (83%) or 0.38 in ‘good’ years (17%), n = 320 nests over 6 years) mainly due to mouse predation, our model predicted that the population collapsed from ~3.5 million pairs in 1956 to an estimated 175,000 pairs in 2020 despite reasonably high adult survival probability (ϕ = 0.901). Based on these parameters, the population is predicted to decline at a rate of 9% per year over the next 36 years without a mouse eradication, with a 31% probability that by 2057, the MacGillivray’ prion population would become extremely vulnerable to extinction. Our models predict population stability (λ = 1.01) and a lower extinction risk (<10%) if mouse eradication on Gough Island restores annual breeding success to 0.519, which is in line with that of closely related species on predator‐free islands. This study demonstrates the devastating impacts that introduced house mice can have on small burrowing petrels and highlights the urgency to eradicate invasive mammals from oceanic islands.”

Macgillivrays Prion held by Chris Jones Prion Cave Gough Michelle Risi
 
 

Chris Jones holds a Macgillivray's Petrel and a downy chick attacked by mice

Photographs by Michelle Risi

The Gough Island Restoration Programme (GIRP) has reported on its Facebook page of the failure "of all our 50 monitored MacGillivray’s Prion nests due to mice predation” in the current 2020/21 breeding season, thus adding a further season of zero breeding success to the study and emphasizing the need for this year’s eradication attempt to succeed.

With thanks to Chris Jones and Michelle Risi.

Reference:

Jones, C.W., Risi, M.M., Osborne, A.M., Ryan, P.G. & Oppel, S. 2021.  Mouse eradication is required to prevent local extinction of an endangered seabird on an oceanic island.  Animal Conservation doi.org/10.1111/acv.12670.

John Cooper, ACAP Information Officer, 23 February 2021

One of the world’s least known seabirds, the ACAP-listed Spectacled Petrel, gets painted for conservation

Lee Mitchelson Spectacled Petrel Mixed media 8 x 10 Peter Ryan 

Spectacled Petrel by USA-based Lee Mitchelson who creates “traditional realism animal art”, mixed media.  “The details of the bird and plants were done in acrylic washes and Prismacolor coloured pencil”

With ACAP’s second collaboration “Painting Petrels in Peril” with ABUN (Artists & Biologists Unite for Nature) coming to an end after two months in a couple of days, it’s pleasing to report that so far over 90 artworks have been received with all nine ACAP-listed petrels and shearwaters being depicted.  A wrap up of ABUN’s 35th Project supporting conservation efforts will follow next month but here’s a taster of some of the works created for the Vulnerable and little-known Spectacled Petrel Procellaria conspicillata, endemic to the South Atlantic’s Inaccessible Island.  Enjoy!

Lea Finke Spectacled Petrel Charcoal chalk and sanguine Peter Ryan

Spectacled Petrel by Lea Finke; charcoal, chalk and sanguine

Marion Schön Spectacled Petrel Peter Ryan

Spectacled Petrel and chick by Marion Schön; there are practically no photographs of chicks of this species so some artistic license had to be used

Helen Worthington Spectacled Petrel water colour Peter Ryan

Spectacled Petrel by Helen Worthington, water colour

LynneWaters Spectacled Petrel watercolour Peter Ryan

Spectacled Petrel by Lynne Waters, watercolour

View a similar collection of ABUN’s Southern Giant Petrel Macronectes giganteus art.

See selected albatross artwork from the first ABUN/ACAP collaboration early last year that had 77 artists producing no less than 324 paintings and line drawings in support of the inaugural World Albatross Day on 19 June.

With thanks to Kitty Harvill, ABUN Co-founder, the contributing artists, and Peter Ryan, practically the only person who has studied the Spectacled Petrel at its breeding site, for his photographs that inspired the artists.

John Cooper, ACAP Information Officer, 22 February 2021

A hooked Black Petrel gets a reprieve

Hook Black Petrel WMIL 3

The fishing hook with cut line visible on the Black Petrel's chest

The ACAP-listed Black Petrel Procellaria parkinsoni, a New Zealand endemic, has both a global and a national conservation status of Vulnerable.  The species breeds on only two islands, with a detailed long-term study being undertaken on Great Barrier/Aotea by Wildlife Management International (WMIL).  Annual burrow monitoring in the study colony this summer revealed an incubating bird with a fishing hook embedded in its chest.  The non-profit organisation Southern Seabirds reports on its Facebook Page on one bird that got a lucky reprieve:

“A recreational fisher clearly hooked this black petrel and was unable to remove the hook.  The trace was cut nice and short which meant the bird returned safely to its burrow on Great Barrier Island and continued to incubate its egg.  A team led by Biz Bell at WMIL had the tools required to remove the hook which was only a few millimetres into flesh.  Happily, it was still incubating its egg when last checked a few days later.  Removing a hook is only possible with the barb crushed by pliers or snipped off with hand-held bolt cutters - definitely worth having on you when you are fishing!”

Hook Black Petrel WMIL 1

The hook after removal, photographs from Wildlife Management International

To learn more rdownload the ACAP Hook Removal from Seabirds Guide.

John Cooper, ACAP Information Officer, 20 February 2021

UPDATED WITH VIDEO. Southern Giant Petrels kill threatened Atlantic Yellow-nosed Albatrosses on Gough Island: a new conservation concern?

 Southern Giant Petrel AYNA Risi

Male Southern Giant Petrel attacking an incubating Atlantic Yellow-nosed Albatross on Gough Island; captured with a motion-sensor camera

Michelle Risi (RSPB Centre for Conservation Science, Royal Society for the Protection of Birds, Sandy, UK) and colleagues have published in the journal Polar Biology on Southern Giant Petrels Macronectes giganteus attacking and killing incubating Atlantic Yellow-nosed Albatrosses Thalassarche chlororhynchos (Endangered) on Gough Island.

Southern Giant Petrel depredating breeding Atlantic Yellow-nosed Albatross on Gough Island

The paper’s abstract follows:

“Giant petrels Macronectes spp. are the largest avian predator-scavengers in the Southern Ocean and feed both by direct predation and by scavenging carrion. However, they are not considered to be predators of adult albatrosses. We report the first records of Southern Giant Petrels M. giganteus attacking and killing incubating Atlantic Yellow-nosed Albatrosses Thalassarche chlororhynchos on Gough Island. From 2017 to 2019, a total of 87 adult carcasses were found near nests within long-term monitoring areas. In 2019, 16 motion-activated cameras filmed 32 nests between September and January, during incubation up until chicks were no longer guarded by their parents. Camera footage revealed at least six different male Southern Giant Petrels independently attacking 11 incubating Atlantic Yellow-nosed Albatrosses, killing and feeding on 5 of those. We also recorded a Southern Giant Petrel attacking a brooding Atlantic Yellow-nosed Albatross and carrying its chick away. Of these camera-monitored nests breeding success was 18.75%, nest failure was due to parent mortality (n = 6), chick mortality (3) and nest abandonment (17), with giant petrels being confirmed or strongly suspected in at least 14 of 26 cases (54%). We observed these attacks in two out of 11 study areas, but it is uncertain whether this behaviour occurs elsewhere on Gough Island, or whether it is a novel hunting method learnt by a few individuals. However, if this behaviour spreads across albatross colonies, the resulting increase in adult mortality could have a significant impact on this endangered Atlantic Yellow-nosed Albatross population.”

With thanks to Michelle Risi for photograph and video clip.

Reference:

Risi, M.M., Jones, C.W., Osborne, A.M., Steinfurth, A. & Oppel, S. 2021.  Southern Giant Petrels Macronectes giganteus depredating breeding Atlantic Yellow-nosed Albatrosses Thalassarche chlororhynchos on Gough Island.  Polar Biology doi.org/10.1007/s00300-021-02810-x.

John Cooper, ACAP Information Officer, 19 February 2021, updated 20 February 2021

ACAP’s new Tristan and Waved Albatross infographics are designed to support this year’s World Albatross Day

Tristan Albatross infographic colour 

Why is the Tristan Albatross Critically Endangered?  An infographic for World Albatross Day 2021

Infographics depicting the conservation threats faced by the Critically Endangered Tristan Diomedea dabbenena and Waved Phoebastria irrorata Albatrosses have been produced to support this year’s World Albatross Day on 19 June and its chosen theme “Ensuring Albatross-friendly Fisheries”.  The ACAP Species Infographics have been designed to help inform the general public, including school learners.  They serve to complement the detailed and referenced ACAP Species Assessments and to accompany the more concise ACAP Species Summaries.

Waved Albatross infographic colour

The infographic for the Critically Endangered Waved Albatross

The English version of the two infographics, and Portuguese language version of the Tristan Albatross infographic are available to download here, whilst French and Spanish versions can be found in their respective language menus of the website under, Infographies sur les espèces and Infographía sobres las especies. The infographics may be freely downloaded at a high resolution to allow for their printing and display as  posters. They also appear in the ACAP Species Summaries gallery.  Please note they are only being made available for personal use or when engaging in activities that will aid in drawing attention to the conservation crisis faced by the world’s albatrosses and petrels – when ACAP will be pleased to receive a mention.  It is envisaged further infographics will be produced as new featured species are chosen to support future World Albatross Days.

Namasri Niumim

Infographic illustrator, Namasri ‘Namo’ Niumim at her worktable

The two infographics have been created by Thai illustrator Namasri ‘Namo’ Niumim from Bangkok, who is currently based in Wellington, New Zealand.  Namo, who works in gouache, is a graduate of the School of Architecture and Design at the King Mongkut’s University of Technology Thonburi with a Bachelor of Fine Arts in Communication Design.  She used preliminary concept designs and texts by World Albatross Day Group member, Michelle Risi, along with photographs supplied by ACAP supporters to guide her work.

With thanks to Jonathon Barrington, Kate Huyvaert, Gustavo Jimenez, Namasri Niumim, Stephanie Prince and Michelle Risi for their inputs to the infographics.

John Cooper, ACAP Information Officer, 18 February 2021

The Agreement on the
Conservation of Albatrosses and Petrels

ACAP is a multilateral agreement which seeks to conserve listed albatrosses, petrels and shearwaters by coordinating international activity to mitigate known threats to their populations.

About ACAP

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Email: secretariat@acap.aq
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