BAHAMA ORIOLE: HABITAT FIND FOR A RARE GEM


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

BAHAMA ORIOLE: HABITAT FIND FOR A RARE GEM

RARE, PRECIOUS – AND FOUND ONLY ON ANDROS, BAHAMAS

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, then add mankind and his needs to the mix. The wrong mix of habitat degradation, clearances, predation or disease could cause the Andros population to disappear as well.

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.  A new study in The Journal of Caribbean Ornithology published by researchers from the University of Maryland, Baltimore County and Bahamas National Trust collaborating on the Bahama Oriole Project (@BahamaOrioleProject) reveals new evidence about the nesting habits and habitats of the orioles that will have “…major implications for future conservation” (this work was funded in part by the American Bird Conservancy and Birds Caribbean).

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. Indeed, these may prove to be the primary nesting locations. 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 coastal coconut palms, until very recently (see above) believed to be the prime nesting habitat for the oriole. In some areas the palms have been all but wiped out. The recent findings in the forests have clearly reduced the impact of this specific problem
  • 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 within the population is also cited as a contributory cause 

*The date of this arrival seems to correspond to when the orioles were extirpated from Abaco. However, see next para.

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”. However, Abaco birding expert Elwood ‘Woody’ Bracey comments (see below) that Bahama Orioles were last formally recorded on Abaco in 1973 by researcher Duncan Everette and his partner who were banding warblers in Southern Abaco in what is now the Abaco National Park. At that time, the Shiny Cowbird was only rarely found on Abaco, if at all.

I’ve found no clear clue as to the cause – nor even when the last evidences 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. As to past history, Kevin Omland of @BahamaOrioleProject says that there are at least 9 specimens in museums around the world collected from Abaco in the 1800s and early 1900s.

eBird map showing Bahama Oriole sightings distribution in c21

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 / Kevin Omland; 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; Handbook of World Birds (drawing)

          ↑ Mr Northrop with his Bird

Bahama Oriole, Andros (D Belasco / abcbirds.org)

6 thoughts on “BAHAMA ORIOLE: HABITAT FIND FOR A RARE GEM

    • News is even better! The conservation project has uplifted the ‘standard’ estimate of 300 birds. It’s now reckoned to be at least 1000, maybe double that. This is basically new Field research. There is a wingbeat of a chance for an Abaco find deep in the forest, but the last confirmed report was 30 years ago, so unlikely… But hey, import a few from Andros if the numbers there sustain it. Thanks for your interest, Myr.

      Liked by 1 person

    • Everyone lives in hope, and (almost?) Never say Never… Abaco Nat Park maybe, far down a logging track? Or off the Highway south of Crossing Rocks in the pines? Up to you to find one… one Kalik reward for picture!

      Like

  1. Bahama Orioles were Last seen on Abaco in 1973 by researcher Duncan Everette and his partner who were banding warblers in Southern Abaco. They now work at a state park in western Oregon in the high desert and he says they were seen in a seasonally flooded patch of Cabbage Palms ca. 6 miles north and west of Hole-in-the Wall. I went there with Erik Gauger in the early 2000s and found the area but we were unable to find any
    remnant population present.
    Why did they go extinct on Abaco? ? ?
    I’ve seen very few Shiny Cowbirds here.
    Woody Bracey
    Treasure Cay, Abaco

    Liked by 1 person

    • Hi Woody, this is a very helpful intervention, not least because ‘1990s’ has become the usual date-span for extirpation. Additionally, Kevin Omland has contacted me: the ‘300 individuals’, again a ‘standard’ stat, needs to be updated in the light of the BO Project research. He says there may now be as many as 2000! I need to amend the post accordingly. As for Abaco, that’s a mystery: shiny cowbirds (I haven’t checked eBird) don’t seem to have hit Abaco very hard even now. I was asked about one on a Cay. I may have mentioned the possibility of…. radical action. Maybe see you next week, with luck?

      Like

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