AUDUBON’S SHEARWATER (DUSKY PETREL): SAD NEWS FROM ABACO


Audobon's_Shearwater - Dominic Sherony wiki

AUDUBON’S SHEARWATER (DUSKY PETREL): SAD NEWS FROM ABACO

Just 2 short years ago, Abaco experienced a shearwater die-off event, when during a period of a week or so numerous dead and dying Great Shearwaters were washed up on many of Abaco’s beaches. You can read about it HERE and a follow-up HERE. This map shows the affected area in 2015.

Now comes news of another such sad event, with a large number of Audubon’s shearwaters (Puffinus lherminieri) appearing in the tideline and on beaches at Bahama Palm Shores, Casuarina, Winding Bay and doubtless elsewhere. Many are already dead. Some are still alive, but in a very poor state. 

Audubons Shearwater from Crossley ID Guide (Eastern Birds) - Richard Crossley : Crossley Guides CCL

SHEARWATER DIE-OFF
These upsetting beach finds seem to be a periodic phenomenon, and very likely result from climate conditions or shortage of food out in the ocean – or a combination. Although most will unavoidably have ingested plastics, that would not explain the simultaneous deaths. Poor fishing conditions – they eat fish and squid – will weaken and exhaust the birds as they try to find food. Woody Bracey thinks this the most likely cause, having noticed recent poor deep-sea fishing conditions and an unusual absence of the frigatebirds that are a sure sign of fish.
Pétrel de Barau - wiki .jpg
WHAT CAN BE DONE?
The dead birds will be quickly removed by the turkey vultures. If you do find one, you might want to bury it. The prognosis for sick birds, sadly, is not good. They may have been carried a long way from open sea and they will be exhausted and starved. Those that are strong enough may recover naturally; but most will sadly die, being too weak and emaciated to survive. There is no available facility able to deal with a large number of very poorly or dying birds. 
The most practical advice I can give is:
(1) move the bird gently into the shade if in the sun
(2) provide water in a shallow dish
(3) offer finely chopped fish BUT no bread – it’s very bad for birds…
(4) if it seems to be working, then carry on until the bird is strong enough to fly (this may be quite a commitment).
(5) do not reproach yourself if a bird you try to help dies. Many will be in such bad shape by the time they are washed up that they are unlikely to survive whatever steps you take.
 
Audubon's Shearwater Stamp) OS
WHAT DO I LOOK OUT FOR?
This poor bird was one of a number of dead birds found by Keith Kemp at Casuarina yesterday. I realise such images can be upsetting, so I am confining photos of the birds to just two so you will recognise one if you see it.
Audubon's Shearwater, Abaco (Keith Kemp)Audubon's Shearwater, Abaco (Keith Kemp)
 AUDUBON’S SHEARWATERS IN AN EGGSHELL
  • Belong to the petrel family
  • Named ‘Puffinus lherminieri’ after French naturalist Felix Louis L’Herminier
  • Also known as the Dusky-backed Shearwater – or by Audubon as the Dusky Petrel
  • Forages by diving out of flight or from the surface; or by surface-feeding
  • Colony breeders, nesting in rock crevices, in burrows, or under thick vegetation
  • Mated pairs spend much time together at nest site. They like rubbing bills together
  • Their ‘twittering calls and mewing’ are usually only heard at night 

Audubon’s ‘Dusky Petrel’

Audubon's Shearwater (Dusky Petrel) - Audubon.org

I’d be interested to hear any other accounts of the current event, especially of any recovery stories. By all means do this as a comment, or email me  / PM on FB

Finally, for those who wonder how pioneer naturalists went about their work observing a species, collecting specimens and recording their findings, here is Audubon’s own account for the ‘Dusky Petrel’, Plate 299 in his magisterial work.

Dusky Petrel (Plate 299)

On the 26th of June, 1826, while becalmed on the Gulf of Mexico, off the western shores of Florida, I observed that the birds of this species, of which some had been seen daily since we left the mouth of the Mississippi, had become very numerous. The mate of the vessel killed four at one shot, and, at my request, brought them on board. From one of them I drew the figure which has been engraved (see above). The notes made at the time are now before me, and afford me the means of presenting you with a short account of the habits of this bird.

They skim very low over the sea in search of the floating bunches of marine plants, usually called the gulf weed, so abundant here as sometimes to occupy a space of half an acre or more. In proceeding, they flap their wings six or seven times in succession, and then sail for three or four seconds with great ease, having their tail much spread, and their long wings extended at right angles with the body. On approaching a mass of weeds, they raise their wings obliquely, drop their legs and feet, run as it were on the water, and at length alight on the sea, where they swim with as much ease as Ducks, and dive freely, at times passing several feet under the surface in pursuit of the fishes, which, on perceiving their enemy, swim off, but are frequently seized with great agility. Four or five, sometimes fifteen or twenty of these birds, will thus alight, and, during their stay about the weeds, dive, flutter, and swim, with all the gaiety of a flock of Ducks newly alighted on a pond. Many Gulls of different kinds hover over the spot, vociferating their anger and disappointment at not being so well qualified for supplying themselves with the same delicate fare. No sooner have all the fishes disappeared than the Petrels rise, disperse, and extend their flight in search of more, returning perhaps in awhile to the same spot. I heard no sound or note from any of them, although many came within twenty yards of the ship and alighted there. Whenever an individual settled in a spot, many others flew up directly and joined it. At times, as if by way of resting themselves, they alighted, swam lightly, and dipped their bills frequently in the water, in the manner of Mergansers.

I preserved the skins of the four specimens procured. One of them I sent to the Academy of Natural Sciences of Philadelphia, by Captain JOHN R. BUTLER, of the ship Thalia, then bound from Havana to Minorca. Two others were presented to my excellent friend Dr. TRAILL, on my first becoming acquainted with him at Liverpool.

I found the wings of this species strong and muscular for its size, this structure being essentially requisite for birds that traverse such large expanses of water, and are liable to be overtaken by heavy squalls. The stomach resembles a leather purse, four inches in length, and was much distended with fishes of various kinds, partially digested or entire. The oesophagus is capable of being greatly expanded. Some of the fishes were two and a half inches in length, and one in depth. The flesh of this Petrel was fat, but tough, with a strong smell, and unfit for food; for, on tasting it, as is my practice, I found it to resemble that of the porpoises. No difference is perceptible in the sexes.

While on board the United States revenue cutter Marion, and in the waters of the Gulf Stream opposite Cape Florida, I saw a flock of these birds, which, on our sailing among them, would scarcely swim off from our bows, they being apparently gorged with food. As we were running at the rate of about ten knots, we procured none of them. I have also seen this species off Sandy Hook.

Audubon’s Range Map for the species
Audubon's-Shearwater_map (audubon.org)

Credits: thanks to those  on Abaco who have been reporting this sad event over the last few days, and to Woody Bracey for his views; Dominic Sherony (wiki) for the header image; Keith Kemp for photos from Casuarina; Audubon.org for images, quote & range map; Richard Crossley / Crossley Guides for the composite picture; Audubon, wiki and random pickings for info about these birds

THICK-BILLED VIREO ‘ON VOCALS’: A CHIRPY JUVENILE ON ABACO


Thick-billed Vireo (juv), Abaco - Charles Skinner

THICK-BILLED VIREO ‘ON VOCALS’: A CHIRPY JUVENILE ON ABACO

I’m not sure that TBVs would rank as anyone’s all-time favourite bird. Probably not in the top 10. Or 20. But we have a particular affection for them. When we first arrive at Delphi, that cheerful call is invariably the first birdsong we hear. And when we leave, it’s often the last. These small birds inhabit the coppice on either side of the drive, and are often found right by the the Lodge.

Thick-billed Vireo (juv), Abaco - Charles Skinner

The strange thing about them is that despite their ubiquity and their uninhibited advertising of their presence, they are surprisingly hard to see, let alone get a clear photograph of. A singing TBV often seems to be at least 2 rows of bush further back than it sounds, concealed by intervening branches, leaves, and twigs.

Thick-billed Vireo (juv), Abaco - Charles Skinner

Maybe growing juveniles are less cautious. This little guy is right out in the open, and singing away happily. He’s still cutely fluffy, but his plumage already starting to turn yellow. He has the diagnostic yellow marking in front of and around the eyes. However at the base of his characteristically plump beak there’s still a hint of baby bird mouth.

Thick-billed Vireo (juv), Abaco - Charles Skinner

Here’s a recording of an adult TBV I took from the Delphi drive (you may need to turn up the volume a bit). And no, I couldn’t actually see the bird, though I knew exactly where it was from the slight movements of foliage. All-in-all, the TBV is a most engaging little bird and well-deserving of affection if not perhaps a high placing in the Avian Popularity Charts…  

Thick-billed Vireo (juv), Abaco - Charles Skinner

All photos by Charles Skinner (a significant contributor to The Birds Of Abaco)

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

MAPPING ABACO, BAHAMAS & FLORIDA IN THE c17


MAPPING ABACO, BAHAMAS & FLORIDA IN THE c17

I once wrote a post tracking the history of Abaco in general, and Hole-in-the-Wall in particular, in historic maps spanning 4 centuries. You can read it HERE.

The post includes a map of the Bahama Islands (‘Isles Lucayes’) by the early French mapmaker Alain Manesson Mallet, published in Paris in 1683. The header shows a later hand-coloured version. The splendid original looks like this. Now that is a map (as Crocodile Dundee once said of a knife)

The recognisable shape of Abaco – I. Lucaioneque – lies weirdly on its side beneath the billowing sails of the vignette, with Grand Bahama (Bahama) between it and Floride. The confusingly named and sized I. Abacoa is Andros; I. Ciguateo is Eleuthera; and I. Curateo is Exuma. I. Guanahani was the landfall for Columbus, and was renamed by him San Salvador. New Providence may or may not be made from the two similar shapes shown west of Andros (at the time, the Lucayan name was Nema). And so on. There’s more to be said on the historic Lucayan names in the Bahamas – maybe one day I’ll get round to saying it…

For now, I want to move on to another map by Mallet that I have just come across. Published in c.1684 (sources vary), this map is of Florida (and beyond), titled rather strangely in German but otherwise in French. Here, the Isles Lucayes are very much a side-feature, reduced to the West End of Grand Bahama, and 4 unspecified small cays like the 4-dot on dice. There’s no embellishment besides the simple ‘draped’ title, the trees and mountains – no fleet of ships in full sail in the Gulf of Mexico. To be honest, though dated within a year or 2 of each, other the maps are so entirely different in style and even script that they could easily have been made by different people. In fact I had to double-check the authorship with various online sources.

Florida is named Tegesta, for the Native American tribe that lived in the region. The name still exists in the form Tequesta, in Palm Beach County Fl. You can read more about this fascinating tribe, their lives and cultural practices HERE. Just two settlements in Tegesta – St. Augustine and St. Mathieu – are shown. I’ve gone rather off-piste from my usual Bahamian territory, but this early map provides an enjoyably interesting cartographic overview of the known topography / geography of the day.

Approximate territory of the Tequesta in the 16th centuryFLMap-Tequesta-tribe2.PNG

If the earth had an uniform surface like a ping pong ball there would be nothing for a geographer to study. But it is not thusly uniform – the actual earth has numerous variations of every sort studied by geographers. Topography maps the physical surface, and geology explores the underground features. But the geography of the earth includes many other [factors] like economics, weather, climate, social distribution, trade, etc.  At the core of geography is cartography – which is the mapping of all these things. Rudolf G. Barton, BA in geography UCB (Commercial Pilot ret.)
Credits: the maps are open source – frequently passed around on the internet and impossible to locate the originator; Wiki for the diagram; Geography lesson, as shown above…

JAW-DROPPING: A GROUP OF GROUPER(S)


Grouper at cleaning station - Melinda Riger @ GB Scuba

JAW-DROPPING: A GROUP OF GROUPER(S)

Today is going to be about Jaws – not those sinister-music-sharky types, but a look at the dentition, gill arrangements and oral hygiene of groupers(s). First, though, the vexed question of the correct plural for a group of these fish. I tackled the complex 3-option correct plural of OCTOPUS a while back. Now another problem piscine plural has cropped up.

Tiger Grouper - Melinda Riger @ G B ScubaThe short answer is that the plural is usually ‘groupers’, but also – perhaps less commonly – ‘grouper’ (there’s a similar situation with plural of ‘hare’). One online source suggests ‘grouperer’, but that just seems cumbersome. I think there may be a useful distinction to be made here. When talking about grouper of the same species, one could say “I saw 17 Nassau grouper today”. But where reference is made to mixed species, “I saw plenty of groupers today” implies that there was more than one species – black and tiger, maybe. 

Grouper at cleaning station - Melinda Riger @ GB Scuba

Grouper - Melinda Riger @ G B Scuba

In some of these photos you’ll notice tiny fish attending to the grouper. These are CLEANERS and they are an essential part of the bodily and oral hygiene routine for larger fish species. The big fish call in at so-called CLEANING STATIONS, where the tiddlers remove parasites and dead skin, and polish up the gills. They will even enter the fish’s mouth to pick bits from between its teeth – the deal being that they will not be eaten. This mutually beneficial arrangement is called ‘cleaning symbiosis’ and is carried out by (for example) gobies, wrasses and cleaner shrimps.

Peterson’s cleaner shrimps and cleaner wrasseGrouper with Peterson's cleaner shrimps and wrasse - Melinda Riger @ GB Scuba

Some of these photos show groupers with open gills as well as open mouths, an invitation to the cleaners to do their work. I’d intended to write about how and why gills work but I’ve thought better of it. There’s a lot of detail about chemical exchange involved that, when I looked more closely, seemed rather dull… and therefore outside the remit of this blog, which includes trying to avoid ‘dull’. If you really want to know more, Wiki has a good article HERE. Good luck with that….

Grouper - Melinda Riger @ GB Scuba

Credits: All photos Melinda Riger, Grand Bahama Scuba

ONE GOOD INTERN DESERVES ANOTHER (Part 1)


Coral reef research, Australia (Oscar Ward)

ONE GOOD INTERN DESERVES ANOTHER (Part 1)

Four years ago a young English friend of ours, Oscar Ward, was lucky enough to be offered an internship with the Bahamas Marine Mammal Research Organisation (BMMRO). At the time, he was post-school, and waiting to start a degree course in marine biology at university. He had no practical experience at all, so he had to progress from the menial tasks (scraping barnacles off the bottom of the research boat) to the more adventurous (whale poop-scooping) to the scholarly (collection and analysis of samples and data, including audio file matching of whale calls for identification). The need for hard work, concentration and accuracy were made clear from the outset… and as you will see, Oscar’s short internship has stood him in very good stead during his university course.

Oscar weekending at Gilpin Point – self-sufficientBMMRO Internship - weekend off (Oscar Ward)

From a promising start on Abaco, and with 2 year’s study behind him, Oscar is currently spending the 3rd year of his 4-year course in Australia, working with The Australian Institute of Marine Science. He has been involved in a number of complex projects focussed on corals and reef life – as we all know, a matter of huge concern – and the projections for the future of the reef systems in a time of warming seas and raised acid levels. Oscar also assists PhD students, for example examining the damaging effects of parasitic worms on coral; and the effect of changing light conditions on corals.

Nurse Sharks, Great Barrier Reef (Oscar Ward)

Much of Oscar’s time has been spent doing fieldwork. Often he is at sea, monitoring and collecting samples in the Southern Great Barrier Reef, diving two or three times a day. This work is often carried out in restricted or preservation zones, and with ever-present manta rays, sharks and sea turtles around him.

Manta Ray, Great Barrier Reef (Oscar Ward)

Right now Oscar is involved with the investigations into the recent bleaching events, work that is at the forefront of serious concern for the GBR and far beyond. I have recently corresponded with him – he has definitely not forgotten that his grounding for the fieldwork and studies that he is engaged in – and very likely his career – came from his time on Abaco and the lessons he learned during his time with the BMMRO at Sandy Point.  (In part 2: another good intern, currently at Sandy Point)

Coral reef research, Australia (Oscar Ward)

All photos: Oscar Ward (the header image is taken from a research vessel – no idea how, maybe a drone with fish-eye lens?)

‘EAGLE EYES’: NEW BALD EAGLE SIGHTING(S) ON ABACO


Bald Eagle - Poquoson, Virginia - Brian Lockwood

‘EAGLE EYES’: NEW BALD EAGLE SIGHTING(S) ON ABACO

In March, I posted about a bald eagle spotted by a Delphi fisherman out on the Marls near Big Pine Point. He didn’t know it at the time, but it was a very rare sighting of this magnificent raptor. The bird is classified for Abaco as a V4, which is to say an extremely unusual vagrant (but not quite a ‘one-off’ V5). 

Bald Eagle - Poquoson, Virginia - Brian Lockwood

You can read all the details HERE, but to summarise, the only previous Abaco sightings were 3 years running over 2000 – 2002, at the end of each year. The annual visits over such a short time-span suggest that this may have been the same bird each time. So this March’s report is possibly the second bald eagle ever seen on Abaco… and on any view, the fourth.

Bald Eagle - Poquoson, Virginia - Brian Lockwood

Now comes the news of another bald eagle sighting in the last couple of days on the Marls, this time by Danny Sawyer while out fishing. The bird was sighted approx 1.5 miles west of the airport / 2 miles south of Bustic Point. Danny’s FB post has unsurprisingly attracted quite a number of comments – and even some more sighting reports. Here’s the list so far…

BALD EAGLE SIGHTINGS REPORTED ON ABACO SINCE c1950 (= ‘ever’)

  • 2000 December, location unknown – info from Woody Bracey
  • 2001  December – Chicken Farm area – Betsy Bracey
  • 2002 December – over Marls opposite Treasure Cay – Woody Bracey
  • 2014  Date unknown – circling the power plant – LC
  • 2017  March – Big Pine Point, Marls – James Cheesewright
  • 2017  Early May – Power plant area – LC
  • 2017  May – Marls – Danny Sawyer
  • 2017  May  – Lubbers / Tahiti Beach area – ‘Kelly’s mom’

Italics indicate a report in comments on Danny’s FB page

Bald Eagle - Poquoson, Virginia - Brian Lockwood

So far, however, there has been no photograph of an ‘Abaco’ bald eagle. It’s fair to say that the official verification of a sighting generally requires a photograph – more especially where there is a risk of confusion with a native bird (eg some warblers). But there really is no mistaking a bald eagle. For obvious reasons it is surely one of the most recognisable raptors of all. And the only Abaco candidates for confusion would be a turkey vulture or an osprey. A quick look shows very little scope for confusion with either:

Bald eagle in flight. Note: dark brown, head & tail bright white, huge yellow beak and feet Bald Eagle In Flight By Carole Robertson (Wiki)

Turkey vulture & Osprey for comparison. No comparison, in fact

Turkey Vulture, Abaco - Bruce Hallett  

 ABACO BALD EAGLE CHALLENGE

How about being the first person to capture an Abaco bald eagle on film digital media? The kudos! The traditional Rolling Harbour bottle of Kalik is already on ice in the expectation of a usable image, together with the accurate location… Failing that, all reports welcome anyway.

Bald Eagle - Poquoson, Virginia - Brian Lockwood

Credits: all brilliant eagle photos by very kind permission of Brian Lockwood, taken in his backyard in Poquoson, Va. except eagle in flight, Carol Robertson (wiki); TUVU (Bruce Hallett); Osprey (Craig Nash); Amusing Cartoon, Birdorable