BAHAMA ORIOLE: HABITAT FIND FOR A RARE GEM


Bahama Oriole, Andros (Dan Stonko / abcbirds.org)

BAHAMA ORIOLE: HABITAT FIND FOR A RARE GEM

c300 LEFT IN THE WORLD – AND ALL ON ANDROS

The future of the gorgeous endemic Bahama Oriole (Icterus northropi) hangs in the balance. IUCN Red Listed as ‘Critically Endangered’, the Oriole once lived on both Abaco and Andros. As recently as the 1990s, the species became extirpated on Abaco, leaving a small and fragile population in  fairly specific areas of Andros. These are places where the habitat is conducive to the orioles’ well-being, and in particular where they can safely breed and (with luck) replenish their depleted population.

Bahama Oriole, Andros (Michael Baltz / Bahama Oriole Project)

We hear a lot about habitat loss as a grave worldwide problem for an increasing number of species. Narrow that down to one species, one island, a few defined areas, and a tiny, barely sustainable population, then add mankind and his needs to the mix. Not much habitat degradation, clearances, predation or disease is needed to reduce 300 specimens to zero.

Bahama Oriole, Andros (Mary Kay Beach Dec 2018)

Which is where conservation and science come into play. The Bahamas archipelago benefits from an astonishing number of (broadly-speaking) environmental organisations that are involved in species and habitat protection, both terrestrial and marine. They range from international to Bahamas-wide and Governmental, to NFP organisations on the main islands, and on through local communities via citizen scientists to dedicated individuals. All are fighting a specific battle with a single aim; all face an increasing array of metaphorical weapons being deployed against them.

Bahama Oriole, Andros (Bahama Oriole Project FB header)

SO, ANY GOOD NEWS THEN?

Returning to the orioles – in many ways a perfect indicator bird species – recent research has led to an encouraging discovery.  The American Bird Conservancy (@ABCbirds) has just published the results of a new study in The Journal of Caribbean Ornithology. This involved several organisations –  Bahamas National Trust, the Bahama Oriole Project (@BahamaOrioleProject), UMBC Biology, and Birds Caribbean. It concerns new evidence about the nesting habits and habitats of the orioles that will have “…major implications for future conservation”.

The study is the outcome of the work of a dozen conservation specialists. In a coconut-shell, the orioles were thought to nest only in the coconut palms found near the coast. However the recent intensive research program reveals that ‘multiple pairs’ breed in the pines and the thatch palms of the forests, away from the coast. The implications of these new findings are significant, not least for a possible uplift in numbers and the way in which conservation measures can be adapted to the new discovery. For those wanting something more authoritative, the short Abstract of the study is given at the end. And if you’d like to read the whole article, click on the link below.

472-Article Text-1543-1-10-20180828

Bahama Oriole Andros (C Ward BNT)

THE MAIN CAUSES OF THE CRITICAL DECLINE ON ANDROS

  • Lethal Yellowing Disease of the coconut palms, prime nesting habitat for the oriole. In some areas the palms have been all but wiped out.
  • The arrival in the 1990s and spread of the Shiny Cowbird Molothrus bonariensis, a brood parasite that lays its eggs in the nests of other bird species
  • Habitat loss / development
  • Forestry work / forest fires
  • Feral cats and rodents
  • Disease has also been mentioned (but I haven’t actually pursued the specifics…)

Bahama Oriole, Andros (Thomas Nierle / Bahama Oriole Project)

WHEN & WHY DID THE ORIOLES VANISH FROM ABACO?

This is a classic ‘riddle wrapped in a mystery inside an enigma’. Various sources I have looked at use a formula such as “…became extirpated from Abaco in the 1990s”, or “disappeared for unknown reasons in the 1990s”. I’ve found no clear clue as to the cause – nor even when the last sighting of an oriole on Abaco was made. I haven’t found a single photo of one taken on Abaco at any time in history. To be fair the option of snapping everything with wings multiple times using a digital camera with a huge chip didn’t exist then. 

ABSTRACT

The Bahama Oriole (Icterus northropi) is a Critically Endangered species endemic to The Bahamas and currently found only on the Andros island complex. With the elevation of the Bahama Oriole to full species status in 2011, research suggested that there were fewer than 300 individuals remaining in the global population. The Bahama Oriole was also termed a “synanthropic species” based on data suggesting that the species nested almost exclusively within anthropogenic residential and agricultural habitats in introduced coconut palms (Cocos nucifera). These conclusions were based on population surveys primarily confined to settled areas near the coasts. However, we documented multiple pairs of orioles with breeding territories deep in pine forests, and we present the first records of Bahama Orioles nesting in pine forests—in both a Caribbean pine (Pinus caribaea) and native understory Key thatch palms (Leucothrinax morrisii). Given the predominance of the pine forests on Andros, this newly documented breeding habitat has important implications for developing population estimates and future conservation plans for the Bahama Oriole.

640px-Picture_of_John_Isaiah_NorthropBahama Oriole Stamp birdtheme.orgCredits: Dan Stonko / American Bird Conservancy, Michael Baltz / Bahama Oriole Project; Mary Kay Beach; Bahama Oriole Project FB header; C Ward / BNT; Thomas Nierle / Bahama Oriole Project; Bahamas Postal Service; BNT; D Belasco / American Bird Conservancy

          ↑ Mr Northrop with his BirdBahama Oriole, Andros (D Belasco / abcbirds.org)

LA SAGRA’S FLYCATCHER: SMALL TYRANTS ON ABACO


La Sagra's Flycatcher, Abaco - Gerlinde Taurer

LA SAGRA’S FLYCATCHER: SMALL TYRANTS ON ABACO

The LA SAGRA’S FLYCATCHER (Myiarchus sagrae) is a common resident breeding species of flycatcher on Abaco, and these very pretty small birds can be seen in many habitats – pine forest, scrubland, coppice and gardens, for example. They are insectivores, as the name suggests, but they also eat seeds and berries. 

La Sagra's Flycatcher, Abaco - Tom Reed

As a ‘tyrant flycatcher’, this little bird is a member of the large passerine order that includes kingbirds, pewees and phoebes, with which they are sometimes confused. I last wrote about LSFs in the infancy of this blog, illustrated with my own rather… ahem… ‘simple’** photos. Time to revisit them and to do them justice with some new, improved images.

‘Simple’ photo from a less complex era, taken with a 2mp ‘Cheepo’™ cameraLa Sagra's Flycatcher, Abaco - Keith Salvesen

Magnificent photo by Gelinde Taurer that you can actually enlarge (click pic see?)La Sagra's Flycatcher, Abaco - Gerlinde Taurer

Unlike many bird species, adult LSFs are very similar in appearance in both sexes. Whatever the gender, they are sometimes confused with their cousins the Cuban Pewees, but those have a very distinctive eye-crescent.

Cuban Pewee – note eye-crescent, absent in the LSFCuban Pewee, Abaco - Keith Salvesen

Both species have a tiny hook at the end of the (upper) beak – to help trap insects, I assumeLa Sagra's Flycatcher, Abaco - Tom Reed

Another thing to notice about LSFs is the amount of rufous brown in their plumage, particularly on the wings and tail – and even at the base of the beak. This coloration is absent from their larger cousin kingbirds, the loggerhead and the gray.La Sagra's Flycatcher, Abaco - Charles SkinnerLa Sagra's Flycatcher, Abaco - Charles Skinner

WHAT SHOULD I LISTEN OUT FOR?

“A high pitched single or double noted sound described as ‘wink’... ” Or it might be ‘bip‘. Or ‘weep‘. Or (on one recording I listened to, complete with sonograph) it sounded like ‘chi-chitty chew‘. But it may have been a misID.

 Hans Matheve @ Xeno-Canto

A hint of a crest is visible in this photoLa Sagra's Flycatcher, Abaco - Peter Mantle

ANY IDEA WHAT LA SAGRA CHICKS LOOK LIKE?

Well, as it happens, yes. By good fortune Abaco photographer and piping plover monitor Rhonda Pearce happens to have had a nest at hand this very season. So, happy to oblige… La Sagra's Flycatcher chicks in nest, Abaco - Rhonda Pearce

WHO OR WHAT IS A ‘LA SAGRA’ WHEN IT’S AT HOME?

Mr La Sagra was a multi-talented Spanish botanist. Ramón Dionisio José de la Sagra y Peris (1798–1871) was also a writer, economist, sociologist, politician, anarchist, and founder of the world’s first anarchist journal El Porvenir (‘The Future’). At one time he lived in Cuba and became director of Havana’s Botanical Garden. His name lives on more significantly in ornithological than in anarchist circles (actually, ‘anarchist circles’ must be a contradiction in terms… that should be ‘anarchist disorganised squiggles’)

I note in passing that La Sagra is a provincial area in Spain, an Italian festive celebration, a chocolatier, and a small comet… All these meanings may have to be negotiated online before you get to the flycatcher…

Ramón Dionisio José de la Sagra y Peris

La Sagra's Flycatcher, Abaco - Tom Sheley

Continuing this blog’s philatelic natural history theme, here are stamps from the Cayman Islands and Cuba featuring the La Sagra’s Flycatcher. The Cuban stamp commemorates the death of Juan Gundlach, the man who chose La Sagra’s name to bestow on this bird. And Gundlach’s name lives on in the Bahama Mockingbird Mimus gundlachii…La Sagra's Flycatcher, Abaco - Keith Salvesen

** ‘Simple’, as in ‘not completely disastrous for an amateur effort but frankly not the sort of standard we have come expect around here’.

Photo Credits: Gerlinde Taurer (1, 4); Tom Reed (2, 6); Keith Salvesen (3 [!], 5, 12); Charles Skinner (7, 8); Peter Mantle (9); Rhonda Pearce (chicks) 10; Tom Sheley (11); Ramon and stamps, open source

BAHAMA ORIOLE: ABACO’S LOST ENDEMIC SPECIES


Bahama Oriole ABC : D. Belasco

BAHAMA ORIOLE: ABACO’S LOST ENDEMIC SPECIES

FEWER THAN 300 LEFT IN THE WORLD – AND ALL ON ANDROS

Having just posted about the endangered NASSAU GROUPER and its protection by the introduction of a 3-month closed season, it’s time to focus on a rare, beautiful and vulnerable bird, the Bahama Oriole (Icterus northropi). It is IUCN Red Listed as ‘Critically Endangered’. ENDEMIC to the Bahamas, this bird lived only on Abaco and Andros. Not any more. Now you’ll only find them on Andros, the species having been lost to Abaco in very recent memory. The 1990s, in fact. And on Andros, this lovely bird is now struggling against the threat of extinction and is found only in limited areas in very small numbers. The most optimistic population estimate I have found puts the total as fewer than 300 individuals… the consensus puts the likely total in the region of 250. Bahamas Oriole, Andros (Binkie Van Es)1 Bahamas Oriole, Andros (Binkie Van Es)2

THE SPECIES

In 2010, the Greater Antillean Oriole Icterus dominicensis was separated by the AMERICAN ORNOTHOLOGISTS’ UNION into 4 species, one being the Bahama Oriole. As the BNT wryly put it, “New species are always a source of excitement… but in this case the intrigue is overshadowed by a sense of alarm and urgency”. For by then this new species ‘in its own right’ was limited to certain parts of Andros, in small and diminishing numbers. It had already vanished from some areas – especially in North Andros – were it had formerly been abundant. The best estimates suggested 250 individual birds. Bahama Oriole - Harold Brewer (via PM) - Version 3

WHEN & WHY DID THEY VANISH FROM ABACO?

This is a classic ‘riddle wrapped in a mystery inside an enigma’. Various sources I have looked at use a formula such as “…became extirpated from Abaco in the 1990s”, or “disappeared for unknown reasons in the 1990s”. I’ve found no clear clue as to the cause – nor even when the last sighting of an oriole on Abaco was made. I haven’t found a photo of one taken on Abaco, although to be fair the option of snapping everything with wings several times using a digital camera with a large chip didn’t exist then. In the next para a number of crucial factors in the more recent decline of the Andros population are given; but as far as I can determine, some at least did not apply in the 1990s, or certainly not to the same extent. Maybe it was a combination of a degree of habitat loss and the gradual decline of a small population that could not breed prolifically enough to sustain the future population **. Bahama_Oriole (Mxmerce Wiki)

THE MAIN CAUSES OF THE CRITICAL DECLINE ON ANDROS

Lethal Yellowing Disease of the coconut palm, prime nesting habitat for the oriole. In some areas on Andros (e.g. Staniard Creek), the palm has been all but wiped out. 

The arrival and spread of the Shiny Cowbird Molothrus bonariensis, a brood parasite that lays its eggs in the nests of other bird species such as the yellow warbler, the black-whiskered vireo… and the oriole. The cowbird reached Andros in the mid-1990s. The first Abaco report that I have found is from 1999 (so presumably, as the oriole was already gone from the island by then, they were not a factor).  The cowbird is a summer resident on Abaco, though still relatively uncommon; and its range continues to expand northwards. Some might argue that the cowbird should be discouraged from spreading on Abaco right now for the sake of the indigenous warbler and vireo populations – before it is too late.

Habitat loss / island development (although Birdlife International notes “…the planting of coconut palms in residential areas has allowed the species to spread into human settlements”). Other factors put forward include forestry work, forest fires, diseases, rodents and feral cats – problems that affect many other birds such as the Abaco parrot. Bahamas Oriole (BNT / Carlton Ward) The photo below is a pleasure to include in this post. It was taken earlier this year on Andros by Christopher Johnson of Nassau. And here’s the thing. He is 13, and an avid birder. I’m sure he likes his X-Box time, but he certainly knows plenty about birds too. He’s quick off the mark with offering IDs – correct ones – for birds online, and when he saw this bird he knew the significance of it and managed to get some good shots too. This is my favourite, the oriole ‘vocalising’. See below for its song. Here is Christopher’s brief but enthusiastic field report: Awesome trip to Andros this past weekend! Was amazed to see the Bahama Oriole and its nest — feeling great”. Bahama Oriole, Andros (Christopher Johnson) 2

Bahama Oriole taken during a BMMRO research trip on AndrosBahama Oriole, Andros (BMMRO)

 Paul Driver / Xeno Canto

A GLIMMER OF HOPE?

In the same way that urgent conservation measures were put in place to halt and then reverse the critical decline of the Abaco parrot population, similar projects are in place for the Bahama Oriole on Andros. One proposal is to establish a ‘captive breeding’ program leading to reintroduction and reinforcement of the wild population. According to the American Bird Conservancy, this could even include reintroduction on Abaco… So perhaps in a decade or two, this fine bird will once again become firmly established as one of the birds of Abaco. Bahamas Oriole, Andros (Binkie Van Es)3 As I said in my Nassau Grouper post, a country’s attitude can to a degree be gauged by the pride with which it features its wildlife and natural resources in its stamps (I used North Korea for adverse comparison). In 2009 The Bahamas Postal Service even issued a ‘Rare Birds’ set featuring the Bahama Oriole.. I rest my case. Bahama Oriole Stamp birdtheme.org

♦    ♦    ♦    ♦    ♦    ♦    ♦    ♦    ♦    ♦    ♦    ♦    ♦

WHO WAS THE EPONYMOUS MR NORTHROP?

640px-Picture_of_John_Isaiah_Northrop

The comprehensive answer is provided by the University of Glasgow Library Research Annexe in relation to a fine  illustration from A Naturalist in the Bahamas (1910), reprinted in The Auk journal (below) at a time when Icterus northropi was still a mere subspecies: The yellow and black Bahama Oriole (Icterus Northropi) is a bird species unique to the Bahamas. The bird was named for American ornithologist and zoologist, John Isiah Northrop (1861–91); the illustration comes from an account of the trip Northrop and his botanist wife, Alice, took to the Bahamas in 1889 which was published in his memory: A Naturalist in the Bahamas: John I. Northrop, October 12 1861-June 25, 1891; a memorial volume (New York: Columbia University Press, 1910). It was edited and introduced by Henry Fairfield Osborn, professor of zoology at Columbia University where Northrop worked as a tutor and was killed in a laboratory explosion shortly (9 days) before the birth of his son John Howard Northrop (who became a Nobel prize-winning chemist). Icterus Northropi illustrated in A Naturalist in the Bahamas (plate 1)

RELATED MATERIAL

“Rediscovering the Bahama Oriole” Erik Gauger, author of the excellent Notes from the Road and photographic contributor to the Birds of Abaco has a good tale of the pursuit of the apparent sighting of a Bahama Oriole on Abaco 2o years after its (supposed?) extirpation. You can read it HERE The Auk Read more about this journal and the birding history of the Bahamas HERE There is a Care2Action ‘Save the Bahama Oriole Before It Is Too Late’ petition HERE. It seems to have stalled somewhat, so it would be good to generate some more signatories. ** Mathematically inclined? Find out about the application of the stochastic process to the oriole’s situation. In a nutshell, this concerns the combined effect of several random adverse factors on sustainability, given that the oriole’s already very small population, very limited range and particular habitat requirements militate against breeding expansion, and therefore increase the likelihood of extinction. We can only hope this is not an inevitability…

Image, audio and research credits: American Bird Conservancy, Binkie van Es, BNT / Carlton Ward, Birdlife International, Christopher Johnson, Cornell Neotropical, Harold Brewer, MxMerce, birdtheme.org, Wiki, Xeno Canto / Paul Driver; Uni of Glasgow / Roger Herriott

BAHAMAS STAMPS & ABACO BIRDS: ‘IMITATION IS THE SINCEREST FORM OF PHILATELY’


BAHAMAS STAMPS & ABACO BIRDS: ‘IMITATION IS THE SINCEREST FORM OF PHILATELY’ 

The Bahamas produces frequent issues of wildlife stamps. Mostly birds, but also reef fish and sea creatures, animals, butterflies and flowers. I am gradually collecting an album of Bahamas wildlife stamps on a PHILATELY page. I’ve been having a look at a 16-bird issue from 1991 which reflects the wide diversity of species extremely well. Here is the set, with comparative photos of each bird. All but one were taken on Abaco, the rare Burrowing Owl being the exception. All the other 15 birds may be found on Abaco as permanent residents, either easily or with a bit of a look and some luck. I personally have not seen the Clapper Rail (though I saw a SORA) or the rarer Key West Quail-Dove.

bah199101l                       GREEN HERON, Abaco (Nina Henry)

 

bah199102l                       Turkey Vulture Abaco (Keith Salvesen)

bah199103l                      Osprey - Abaco Marls (Keith Salvesen)

bah199104l                      Clapper Rail, Abaco (Erik Gauger)

bah199105l                     Royal Tern Abaco (Keith Salvesen)

bah199106l                     BAHAMAS - Key West Quail-dove (Becky Marvil)

bah199107l                    Smooth-biled Ani, Abaco (Bruce Hallett)

bah199108l                    Burrowing Owl (Keith Salvesen)

bah199109l                  Hairy Woodpecker, Abaco (Tony Hepburn)

bah199110l                   Mangrove Cuckoo, Abaco, Bahamas (Tony Hepburn) copy

bah199111l                   Bahama Mockingbird, Abaco (Keith Salvesen)

bah199112l                 Red-winged Blackbird Abaco Bahamas (Keith Salvesen)

bah199113l                 Thick-billed Vireo, Abaco (Susan Daughtrey)

bah199114l                 Bahama Yellowthroat vocalizing.Abaco Bahamas.Tom Sheley

bah199115l                 Western Spindalis Abaco (Janene Roessler)

bah199116l                  Greater Antillean Bullfinch, Abaco (Bruce Hallett)

 The bird list and image credits

 Green Heron                     Butorides virescens               Nina Henry

Turkey Vulture                   Cathartes aura                     Keith Salvesen / RH (Delphi)

Western Osprey                Pandion haliaetus                 Keith Salvesen / RH (Marls)

Clapper Rail                      Rallus longirostris                 Erik Gauger

Royal Tern                         Thalasseus maximus            Keith Salvesen / RH (Marls)

Key West Quail-Dove      Geotrygon chrysia                 Becky Marvil

Smooth-billed Ani            Crotophaga ani                      Bruce Hallett

Burrowing Owl                  Athene cunicularia              Keith Salvesen / RH (UK)

Hairy Woodpecker             Picoides villosus                   Tony Hepburn

Mangrove Cuckoo             Coccyzus minor                     Tony Hepburn

*Bahama Mockingbird     Mimus gundlachii              Keith Salvesen / RH (National Park)

Red-winged Blackbird      Agelaius phoeniceus       Keith Salvesen / RH (Backcountry Abaco)

Thick-billed Vireo              Vireo crassirostris               Susan Daughtrey

*Bahama Yellowthroat       Geothlypis rostrata            Tom Sheley

Western Spindalis              Spindalis zena                       Janene Roessler

Greater Antillean Bullfinch  Loxigilla violacea            Bruce Hallett

* Endemic species for Bahamas

STAMPS            http://freestampcatalogue.com            Tony Bray

PHILATELY WILL GET YOU… NICE BAHAMAS WILDLIFE STAMPS


Parrot

WILDLIFE STAMPS OF THE BAHAMAS

with guest expert PHIL LATTERLY

The Bahamas ‘does’ extremely nice stamps, in particular ones featuring the rich and varied wildlife of the islands. The islands spread from the subtropical climates of the north, on a level with Florida, to the near-tropical islands of the south. This ensures plenty of scope for designing pretty sticky bits of paper to stick onto other bits of paper. One of the small pleasures in life, near-lost to the tyranny of the email…

The sets of wildlife stamps are issued by the Bahamas Post Office. I’ll add to this collection piecemeal (including some from my own modest collection). The very latest commemorative issue heads the display.

1. SEA CREATURES

BREEF 20th Anniversary Issue – November 2013IMG_2918

REEF FISHESBahamas Reef Fish StampsBahamas Bonefish Stamp (old-style)Bahamas Marine Life Stamps 2012

2. BIRDS

February 2012: WWF Flamingo Issue

Best seen on Inagua, the island where they breed. Less often found elsewhere, and sadly now only as occasional ‘vagrants’ on Abaco. Flamingo post with wonderful pictures of adults, babies and nests HEREBahamas Wildlife Stamps Flamingos

PARROT POST

Found mainly on Abaco (the resident underground nesting variety) and Inagua (conventional nesters), where they breed. Small groups are now found elsewhere, e.g. Nassau, where there is a local monitoring programme, but I’m not sure that there is evidence of breeding there. Any info welcome… One (of several) lavishly illustrated parrot posts HERE

 Impressive commemorative issues for the BAHAMAS NATIONAL TRUST

OTHER BIRD SPECIES

Bahamas Wildlife Stamp Osprey

The KIRTLAND’S WARBLER is one of the rarest birds of the Bahamas, a winter resident that breeds only in a small area of Michigan. The entire population is numbers only a few thousand birds. The number of sightings annually on Abaco is very small – fewer than a dozen, and in some years none at all. Increasing knowledge about their favourite haunts is now improving the recording rate. I know of two seen this year, on the same day… a birder’s lifetime achievement.

Bahamas Stamps Kirtland's Warbler (eBay)

This swallow is endemic to the Bahamas

Found on Abaco only as an occasional visitor.

stock-photo-a-bahamas-stamp-featuring-a-burrowing-owl-on-the-face-10479643 copy

WATERFOWL                Credit as shown

3. ANIMALS

Bahamas Wildlife Stamp Set

Bahamas Wildlife Stamps Sept 1984Bahamas Wildlife Stamp Set - Bat, Hutia, Raccoon, DolphinBahamas Potcake Stamps (First Day Cover)

4 BUTTERFLIES & INSECTSBahamas Butterfly Stamps

Credits: A compendious credit to sundry online sources including Bahamas PO, Bahamas Weekly, eBay and other sales / promotional sources, ads and the like, and unknown sources. I rarely find myself having to use this broad sweep approach: if your pic is here and you are upset, apologies, contact me to express your displeasure &co and I’ll take it down of course. But these are only non-rare small bits of paper; and this is a humble non-profit making info site of limited appeal in a Big Wide World. OK with that?