HUTIAS: ABACO’S EXTINCT RODENTS LIVE ON… ELSEWHERE
The Bahama hutia (Geocapromys ingrahami) has the distinction of being the only indigenous land mammal in the Bahamas. Historically found on a number of islands, the species is now confined to very limited locations. Abaco is, sadly, no longer one of them; they are officially shown as extirpated here from about 1600. Hutias had been recorded on Great Abaco by early explorers from Europe, but their survival was already threatened by hunting and land clearance as the human population expanded.
Further evidence of their long-term existence on Abaco – prehistoric, even – comes from research carried out by divers in the land-based Blues Holes. SAWMILL SINK has been a particularly rich source of the remnants of early creatures, including well-preserved skeletons, carapaces or other remains of crocodiles, turtles, birds, bats – and hutias. These date from the Pleistocene epoch of the Quartenary period, spanning roughly 2.5m years and ending some 12,000 years ago. You can see some of these treasures in the wonderful Natural History Museum at Friends of the Environment in Marsh Harbour.
A c20 hutia from the Exumas on display in the museum
Exhibits in the museum – there’s even a dead parrot for Monty Python fans
The population of the extant Bahama hutia species Geocapromys ingrahami became so depleted that by the 1960s they were considered to be extinct. Then in 1966 a colony was discovered on East Plana Cay. Some have since been relocated (see below) and the overall population is now confined to a handful of locations, for which reason the Bahama hutia is IUCN listed as vulnerable. All the usual man-caused threats to their survival apply, as well as predation by dogs and feral cats. One place to find them is in the Exumas, but because they are mainly nocturnal creatures and there are few of them, a sighting is a rare event, let alone getting a decent photo op.
A ‘Demarest’s Hutia’ – not the Bahamian species, but very similar
The terrific header image and the second image were taken by teenager Cole Fiechter while on a sailing trip with his parents and brother in the excellently named ‘Truansea’. On the beach of the Exumas Land and Sea Park at Warderick Wells, they encountered “a guinea pig with a rat’s tail”: a hutia. Cole’s photograph will hopefully grace the forthcoming Field Guide to the Natural History of the Bahamas, now in the late stages of production, and with which I am peripherally involved.
MARK CATESBY‘s take on the hutia in the c18, where he describes it as a rabbit
The BAHAMAS NATIONAL TRUST notes that “Bahama hutias occur naturally only on East Plana Cay (located between Acklins and Mayaguana). Historically however, they were found on ten Bahamian islands. In a move to protect the species, a small Bahama hutia population was transplanted to two locations – Little Wax Cay and Warderick Wells (Exumas). These three locations now host the only known populations of this particular species in the whole world”.
It looks as though Warderick Wells might be your best bet to see a Bahama hutia if you are visiting the Bahamas. Don’t be too confident of coming across one – but if you do see one, you will have had the pleasure of seeing a very rare creature.
Credits: Cole Fiechter (1, 2); Keith Salvesen / FOTE (3, 4); ‘Yomangani’ wiki (5); OS (6); Princeton UP (7). Research credits PNAS, BNT, FOTE
Recently I was contacted by someone who had found an unusual orchid on Abaco and wanted to find out more about it, starting with ID. Lucy, an English botanist who has been visiting Abaco with her husband for many years, discovered a strange wild orchid species that did not appear in any of her books. So she turned to Detective Harbour who, unknown to her, is mostly paralysed with hopelessness when it comes to plant ID (except hibiscus, obvs). But he can sometimes find the people who know these things…
Lucy’s photos showed a striking, tall-stemmed plant growing from an exposed round root. She found 3 plants in Cherokee near Watching Bay; and another growing randomly beside the road at the airport – ‘bizarrely’, as she points out. She (and I) assumed the orchid to be a native species, and hopefully a rare one. I couldn’t track it down online so I got the views of Mark Bennet at the Leon Levy Preserve, and the BNT plant expert Ethan Freid. Both agreed that the orchid is Eulophia graminea.
Disappointingly, this orchid species turns out not to be a rare native one at all – which explains the problem of searching for it in books and online as a Bahamas species. It is in fact a non-native invasive plant from south east Asia. It has apparently been spreading through the Bahamas over the last 10 years or so, having originally been introduced into the region in south Florida. So, while of interest, the orchid does not really ‘belong’ – unlike Encyclia Inaguensis which Laine Snow has helpfully identified as the most similar Bahamian orchid.
This raises the ‘Brown-headed Cowbird Conundrum‘. The plant is here on Abaco. By rights it has no business to be. It has probably arrived from Florida, where it has no business to be either. So the big question is, does its presence impact on native flora species in any adverse way?
Is it a benign addition to the plant species of the Bahamas, that in 100 years time will be fondly viewed as a native and appearing in books / online as local.
Or is it an unwelcome intruder, quick to spread and slow to eradicate, aggressively gaining an increasing hold on the precious soil and water resources on Abaco and exterminating the native orchid species in the process (cf in the UK Himalayan Balsam / Giant Hogweed / Japanese Knotweed).
Or somewhere in-between – not exactly welcome and trouble free, but something the local flora can get along with, without unacceptable levels of damage to the local species. Just about tolerable.
SO, WHICH OF THE THREE IS IT?
Well, I’m afraid Eulophia graminea is in category 2 – the real brown-headed cowbird category. It was first discovered in Miami in 2007. The bulbs from which the plants grow are hard to dig up. They are covered in little roots, each one of which has the potential to become a new plant. Already it has spread rapidly in Florida, and has now been found growing in most types of plant habitat, from maritime to rockland. In other words, it is not at all good news.
OH NO! WHAT’S TO BE DONE?
Well, first I would not advise unilateral action… I take a tough line, though, on potentially damaging non-natives – namely, remove them before they spread uncontrollably and ineradicably. In this case I’d suggest that if you see this plant, note and mark the location and report it to the BNT and ask their advice. They will no doubt have a general policy on invasives, or make one on a case-to-case basis.
FUN (?) FACT
The word ‘orchid’ comes from the Latin Orchis or orchideæ, and Greek ὄρχις (orkhis). This means a testicle, and is based on the shape of the root. In medieval England, orchids were called ballockwort. To this day the surgical procedure known as an orchidectomy refers to the removal of one or both testicles. Moving swiftly on…
Credits: Lucy and Mark Davies (1 – 4); Bob Peterson Wiki (5); Scott Zona Wiki (6); Mark Bennet, Ethan Fried & Laine Snow for ID; University of Florida, Institute of Food and Agricultural Sciences, Center for Aquatic and Invasive Plants, Plant Directory for research; Online Etymology Dictionary for Orchid definition…
The national bird of the Bahamas, featured in the nation’s Coat of Arms, was once a familiar sight in the Bahamas, but sadly no more. On Abaco they are no longer seen, apart from occasional vagrant birds that stay for a few weeks and then disappear.
An attempt in the 1990s to reintroduce flamingos on Abaco and to establish a breeding population failed. You can read more about the history of the ‘fillymingo’ on Abaco HERE.
Nowadays, the flamingos breed only on Inagua, and to see these gorgeous birds you will have to go to theINAGUA NATIONAL PARK , where you will find the world’s largest West Indian flamingo colony.
The breeding season is now under way, with large numbers of fluffy gray chicks finding their legs in the lagoons. A team from the BAHAMAS NATIONAL TRUST is working with them at the moment.
The team have with them the distinguished wildlife photographer MELISSA GROO, whose wonderful award-winning work will be known to anyone with a keen interest in wildlife. If you want to see wild birds and wild animals as you may never have seen them portrayed before, do visit Melissa’s superb website by clicking her name link above.
Credits: Melissa Groo, with thanks as ever for use permission [please note that her images are subject to her professional copyright]; BNT, especeially Lynn Gape & Casper Burrows (header image)
A while back I wrote a post about the mysterious population of Cuban parrots in Nassau. The mysteries being, how and when did they get there; and how and especially why is the population slowly increasing when there is scant evidence of nests, fledglings or juveniles; and no equivalent secluded location for cave-nesting, as the Abaco parrots do in the limestone holes in the Abaco National Park.
STOP PRESSMelissa Maura comments“I was brought a wounded juvenile years ago, and raised and successfully released it here along with a wild flock of 5 or 6. They ARE nesting in the odd large tree cavity in undisclosed parts of Nassau. I’m pretty certain the original pair escaped from a cage within the garden of people associated with the BNT many years ago. They may have been re-habilitated youngsters, originally requiring human help. At any rate our precious birdies are thriving – along with the odd impostor!”
I won’t expound the theories again – if you are interested you can check out the original article HERE. You’ll find I have since incorporated quite a few very informative comments that were made in response, touching on the above mysteries but with differing theories.
HOW BIG IS THE NASSAU POPULATION?
In the summer, when I last researched this, the maximum reported number was about a dozen. It’s not clear whether those were all seen at the same time – obviously an important evidential factor, since it precludes double counting. It has now become clear that there are a minimum of 15 birds, because recently a flock of 15 were all sighted together. As I added to the previous post:
STOP PRESS On 6 October 2016 New Providence was in the direct path of Hurricane Matthew. Despite the power of the storm, by the following day there was a report of a sighting in Nassau. Today, 9 October, comes a report of a group of 15 – as far as I am aware the highest number sighted together. Maybe they all came together for solidarity… In any event, the sighting confirms that, at least as far as the parrots are concerned, the hurricane has not caused any problems.
Posing prettily for photos – though maybe a bit ‘snooty supermodel whatevah’ in the second…
The photos in this post were all taken in the last couple of days by Nassau Resident Lynn Gape, of the BAHAMAS NATIONAL TRUST. Some of them show very clearly the bright blue on the wings of these lovely birds – a colour that is much more evident in flight.
You can keep track of the Nassau parrots on a dedicated Facebook pageBAHAMA PARROTS OF NASSAU LOCATOR. This is a well-used resource, with many local people adding their sightings (in some cases, just the ‘hearings’) of these lovely (but raucous) birds. From the reports I was able to draw up a rough map for the main area of sightings (red oval), and the hotspot from which most reports are made (orange oval). There are outliers, of course, mainly to the south.
Like all parrot species, Cuban parrots are gregarious. And the more that are gathered together, the louder the party. And other psittacine species are happy to get in on the act. The image below and image #2 above show a black-headed parakeet mixed in with the parrots. I’ve seen earlier photos where he is hanging out with them. There seems to be no animosity between the species.
So there we have it. The population is rising and there is no definitive explanation. Releases of captive birds are unlikely, since these parrots are now a protected species. The smart money must, I think, be on a the colony nesting in tree holes somewhere secluded. Parrot awareness has greatly increased on New Providence, and no doubt the issue will eventually be resolved. But in many ways I rather hope it remains a mystery.
Where did they come from, and when did they arrive on New Providence? And how? The conventional wisdom is that the Cuban Amazon or rose-throated parrots (Amazona leucocephala) exist in the Bahamas only on South Abaco (from Marsh Harbour down to the National Park) and Inagua. The species is arguably (but not as yet officially) divisible into two subspecies. On Inagua, the parrots behave as you’d expect, including in their breeding and tree-nesting habits. Conversely, the parrots of Abaco nest underground in limestone holes and crevices in the National Park at the southern end of the island. This very distinctive habit makes them vulnerable to predators of course. On the other hand, there is good protection from the forest fires that pass rapidly and harmlessly through the scrub above them, yet which would make tree-nesting extremely hazardous. It would be interesting to know if the parrots of Abaco have always done this; or whether they were originally tree nesters who adapted their behaviour to meet changed conditions in their habitat.
WHEN DID THE PARROTS ARRIVE IN NASSAU?
The BAHAMA PARROTS OF NASSAU LOCATOR group was set up on Facebook in early 2012 by Shelley Cant-Woodside. Lynn Gape of the Bahamas National Trust (BNT) was also involved from that early stage. The stated purpose of the group was “to help locate the increasing reports of parrot sightings on NP in general and Nassau in particular”. This suggests an increased awareness of an existing intrusion of the colourful and noisy Cuban parrots, a species hard to mistake or ignore. At the other end of the time-scale for their arrival on NP, when omniscient and much-missed ornithologist Tony White published his comprehensive checklist for each Bahama island in his Birder’s Guide to the Bahama Islands (inc. TCI) in 1998, no record existed of a sighting of a Bahamas parrot on NP. Abaco and Inagua, yes. But nowhere else. So that gives less than a 14-year window for a parrot influx.
SO HOW DID THEY GET TO NP?
There are realistically two possibilities. Either two or more captive parrots on NP (including a male and a female!) escaped or were released on NP; or were brought to NP and freed. Alternatively, says another theory, a flock of parrots in the Abaco National Park were caught up in a hurricane, and involuntarily relocated to the nearest land in the confusion. It could of course be both (Helpful Reader: “…or neither?”). Shelley tells me: “I know thatARDASTRA GARDENS(Nassau Zoo) positively identified Bahama Parrots on New Providence as early as 2004, which is when I worked there. We were told at the time that some folks had purposely released them. I doubt that it is related to hurricanes”.
This theory is by far the most likely one, and is supported by anecdotal evidence. Even so, it is not entirely straightforward. I don’t know what protection was afforded the parrots in the Bahamas in the early 2000s, but certainly there were captive birds; and indeed there was and is a market for this species of Amazona further afield – Cuba for example, and (to my huge surprise) the UK, where a single bird may be had for £380 ($500). But even assuming the existence of a few males and females, they would have needed to breed. And there are few, if any, contemporary reports of parrot nests in trees; or of chicks or juveniles. If these bright, noisy birds were new to Nassau around 2004, they must surely have attracted some attention if they were breeding and spreading from then on.
I have taken a look at several Bahamas hurricanes and tropical storms between 2004 (the Ardastra ID) and 2012 (Locator page founded). Tracking and intensity information rules out most of them. It’s fair to say that the paths of the storms are almost invariably from the south / east veering west / northwards. You might think that a parrot flock could not be carried by hurricane 50 miles in the opposite direction, from the south of Abaco to New Providence. But perhaps disorientation and self-preservation play their parts – a psittacine instinct to fly away from the danger, in the opposite direction from its path, towards where the weather is calmer.
Hurricane Irene tracking path
WHAT’S THE ANSWER, THEN?
To check the rival theories, I asked well-known scientist and parrot expert Caroline Stahala for her views. This authoritative opinion leads to the conclusion that the Parrots of Nassau result from escape, or release from captivity, perhaps supplemented by later importation.
“I know people like the ‘hurricane’ theory but there isn’t much support for it, especially since we did get reports through-the-grapevine that someone had released these birds. They did show up after a serious hurricane season Frances/Jeanne etc  but thats probably because their housing in Nassau was damaged or the person who had them couldn’t take care of them properly. During hurricanes, parrots don’t fly away, they hunker down and ride out the storm. Amazon parrots absolutely do not like flying over large bodies of water, their wings are designed to be super manoeuverable in forests, not for distance flights, so the chance that they would fly over water during a hurricane is very very slim. Not to mention a whole group of them (6-12)”.
On the other hand, it’s not that simple. Lynn Gape (BNT) comments: “I heard the hurricane theory differently. I was told that someone thought that the parrots flew to Nassau with a flock of White Crowned Pigeons after one of the hurricanes. The thought being that although they do not like to fly over water, they were really in need of food and felt there would be strength in numbers for the flight”.
WHERE CAN I FIND THEM?
Almost all reported sightings have been in East Nassau. Occasional sightings have been reported outside that area but the overwhelming majority are within the RED oval on the map below, with the hotspot area within the ORANGE oval. I base this both on the Locator page and also the somewhat sporadic eBird reports.
SO THE NASSAU PARROTS MUST BE BREEDING, RIGHT?
Parrot sighting reports are increasing but that fact, as I have discovered on Abaco, does not necessarily suggest an increasing population. Increased citizen enthusiasm and awareness is also linked to increased bird reporting, as is the advent of simple reporting systems such as social media posts, eBird and so forth. However the impression I get from reading the Locator posts is that, while evidence of actual population growth is unclear, numbers may be being maintained despite an inevitable attrition rate. The Locator has sad images of 2 known casualties, causes of death unknown.
WHERE ARE THEY NESTING, THEN?
It seems that, unlike Abaco, there is no secluded forested area on NP with suitable limestone terrain to provide underground caves. Therefore the parrots must be finding other suitable cavities, the most obvious being in trees. As far as I can make out, there have been very few – if any – reports of juvenile parrots being seen. For that matter, there have been none of nesting behaviour either – a pair of parrots in a tree preparing a nest, taking turns on the eggs, foraging for food for the chicks, or squawking flying instructions at the fledglings**. So perhaps there is an unfrequented area of coppice on NP, some distance from the bustle of Nassau, where all this takes place in midsummer. By the time they put in an appearance in the town, they have already grown to young adulthood.
**COMMENTOn the question of evidence of nesting behaviour, Lynn Gape says: “I have seen four parrots in my garden, and they exhibited behaviour similar to what I have seen with adult and juvenile parrots on Inagua – calling for food, and adults feeding them. So possibly there may have been some successful breeding”.
This recent photo (below) by Ian Coerbell shows the sort of tree cavity that according to Caroline Stahala might be a possible nesting site. She says:
“I did document a nesting pair of Abaco parrots in Nassau. The nest was in a tree cavity. However, as long as the birds have been there, the numbers do not seem to have increased. For some reason they aren’t very successful on NP. Melissa Maura rehabbed a young Abaco parrot that was found malnourished & dehydrated in Nassau. She ended up releasing it but we don’t know what happened to it.”
Cat Binks has commented that she believes there is a nesting location in an overgrown lot adjacent within the ‘hotspot’ area. She sees them most evenings, sometimes as many as six. Cat also confirms that “enthusiasm and awareness has increased… I’m getting daily feedback about fly-overs [in the hotspot area]”.
A parrot and chick in a limestone cave nest on Abaco
HOW MANY OF THEM ARE THERE?
The BNT gave this estimate of numbers a few years ago:“There is a very small population (less than ten individuals) on the island of New Providence”. I suspect it is difficult to make a reliable estimate of numbers now. The birds are unbanded, and there is a considerable risk of double-counting when the sightings are of 2 or 3 at a time, in different locations over a very small area. I think it’s probable that the number has reached double figures, and that in any event it is not diminishing despite some casualties.
STOP PRESSOn 6 October 2016 New Providence was in the direct path of Hurricane Matthew. Despite the power of the storm, by the following day there was a report of a sighting in Nassau. Today, 9 October, comes a report of a group of 15 – as far as I am aware the highest number sighted together. Maybe they all came together for solidarity… In any event, the sighting confirms that, at least as far as the parrots are concerned, the hurricane has not caused any problems.
Caroline points out that there is a good chance of interbreeding between feral Amazon species in Nassau that ‘hang out’ with the so-called Abaco parrots:“That would basically make the Bahama parrot population a hybrid and not of much conservation use. Having said that, I still think its really neat that the birds are there and I hope everyone enjoys seeing them in a natural setting. Hopefully we can find out more about them in the next few years”.
Lynn comments: “With regards to the interbreeding with feral parrots that does not seem to be a problem at this time – we did at one time see them with a Yellow Nape Amazon but that bird has disappeared; and according to Caroline Stahala they will not breed with the Black-headed Parakeet. We thought that the birds did nest in a large tree right on Parliament Street. Caroline Stahala and Predensa Moore investigated but did not find conclusive proof. However the timing would correspond with the time when Melissa found and took care of the young parrot”.
WHAT ARE THE HAZARDS FOR THE PARROTS?
Numerous, as you’d imagine, especially in an urban setting, though the birds may have adapted their behaviour to an extent to avoid some of the obvious dangers. There is evidence that some birds are already adapting to urban life, as this recent photo shows. Two parrots have teamed up with a black-hooded parakeet (presumably escaped or released from captivity) to investigate a vehicle and maybe play with the windshield wipers…
STOP PRESS Parrot in a Gumelemi tree, Skyline Heights, Nassau. A great shot by Linda J Clews, with thanks. The parrots have sadly stopped coming to her property since the clearance of coppice to make way for the golf course of the Baha Mar development – an example of the effects of habitat loss on wildlife.
ARE THEY PROTECTED, OR CAN WE CAGE THEM OR SHOOT THEM?
Yes, and no, and definitely not. According to the Bahamas National Trust “Bahama Parrots are protected under the Wild Birds (Protection) Act. It is illegal to harm or capture or offer this bird for sale. The Convention for the International Trade of Endangered Species (CITES) list the Bahama Parrot in Appendix 1 meaning that it is a species which is near extinction or very endangered”.
If anyone would like to know what a flock of these wonderful but uninhibitedly raucous birds sounds like, this is a short recording I made at Bahama Palm Shores, Abaco (an excellent hotspot for them incidentally).
Credits: Shelley Cant-Woodside and Caroline Stahala for information and advice; Locator page members for active or tacit use permissions; photos by Melissa Maura (1, 2, 5); Lynn Gape (3, 7); Sandy Cunningham (4); Neill Pritchard (6, 10); Ian Coerbell (8); Caroline Stahala (9); Tim Colclough (11); Linda Clews (12); Keith Salvesen (13)
HAWKSBILL TURTLES: A RARE FIND & SWIMMING WITH ANGELS
There is something unusual about this juvenile hawksbill turtle peacefully noodling round some impressive elkhorn coral with the grunts and sergeant majors. He’s a rarity. He was found at West End, Grand Bahama (just 67 miles swim from West Palm Beach Fl.), a place where hawksbills are very scarce. Loggerheads, they have. And there are plenty of hawksbills elsewhere in Grand Bahama waters. But not at the western tip. So finding this little guy and getting some good photos was a particular pleasure for Linda Cooper. And maybe the presence of a juvenile is a sign that hawksbills may begin to populate the reefs of West End, as perhaps they did historically.
Linda and her husband Keith run West End Ecology Tours.They have a comprehensive website HEREand a Facebook pageHERE. Check it out to see how much there is to explore at West End. The birds, the corals and reef life, the starfish – and a speciality, swimming with rays. To which can now be added the chance of seeing a hawksbill turtle…
A DOZEN HAWKSBILL FACTS TO CHEW OVER
All sea turtles are classed as reptiles (something that always surprises me, somehow)
The top shell (carapace) consists of scales that overlap like roof shingles
The yellowish bottom shell is called the plastron
Adult hawksbills weigh around 100 pounds
Sea turtles sleep at night, and can stay underwater for a hours without breathing
Hawksbills are omnivorous, eating algae and seagrass but also sponges, urchins and small fish
Females lay about 100 eggs like ping-pong balls, and then at once return to the sea for good
The sex of baby turtles is determined by relative nest warmth – females from the top eggs
Baby turtles hatch almost simultaneously: all must work to dig their way out.
They tend to hatch at night and head straight for the sea’s phosphorescence…
…except that artificial lights confuse them & lead them away from the sea to likely death
As I was writing this, another fact about hawksbills popped into my head. I checked through my archive – mainly Melinda Riger’s wonderful shots from elsewhere on GB – and yes, it is true. There seems to be some sort of symbiotic relationship between the turtles and angelfish. They are often found feeding together. A bit of research confirms this general observation, without giving a clear cause for it. Maybe it is simply that they eat some of the same food; and that there is plenty of it on healthy reefs so there is no cause for aggression on either side. It’s fine for a hawksbill to share with an angel.
NOTE The Hawksbill is listed as Critically Endangered by the IUCN red list of Threatened species as its populations have declined dramatically throughout the world and especially in the Caribbean region. It is listed in Appendix I of the Convention on the InternatIonal Trade of Endangered SpecIes (CITES) meaning that Hawksbills are near extinction or very endangered. All marine turtles are now protected under Bahamian law, as is the taking of eggs.
Credits: West End Ecology Tours / Linda & Keith Cooper (photos 1, 2, 3); Melinda Riger / Grand Bahama Scuba, all other images;BAHAMAS NATIONAL TRUST for their very useful fact-sheet (one of many) which I have adopted and adapted; Aquoflite for the vid.
Today the NOAA and other worldwide ocean guardian organisations are celebrating World Oceans Day. Looking at the websites and FB pages, one message is clear: People Are Rubbish. To put it another way, the global pollution of the oceans is caused solely by humans. The pristine seas and beaches of the world were unsullied until, say, the last 200 years. In 4 or 5 generations, all that has changed irreversibly.
My rather (= very) negative intro is counterbalanced by some more positive news: there are plenty of good guys out there working hard to make a difference to the rising tide of filth polluting the oceans. Clearing seas and beaches of plastic and other debris. Collecting tons and tons of abandoned fishing gear. Rescuing creatures trapped, entangled, injured and engulfed by marine debris and pollutants. Educating adults and – far more importantly – children and young people by actively involving them in their campaigns. Conducting research programmes. Lobbying and protesting. And a lot more besides.
A marine garbage patch: the sea creatures’ view (NOAA)
Abandoned fishing gear: a monk seal that was lucky; and a turtle that wasn’t (NOAA)
Four shearwaters killed by a cone trap. A fifth was rescued (NOAA)
The NOAA and sister organisations carry out massive programmes of clearance of marine debris, with working parties of volunteers who do what they can to deal with an intractable problem.
Elsewhere, some tackle the problems caused by particular types of trash, balloons being an excellent example. I have posted before about BALLOONS BLOW, the brainchild of two sisters who learnt of the serious consequences to wildlife caused by mass balloon releases. Their work has been so effective that increasing numbers of mass releases are being cancelled in favour of other forms of celebration. A minus for balloon-makers of course, but a big plus for wildlife. The BB sisters also keep their own beach clear of the junk brought in on every tide.
And on an individual basis, any old fool can make a tiny difference to a local beach. Here is one such doing just that…
A tangle of balloon strings on Delphi beach
Guinea Schooner Bay: little visited, rarely cleaned. Plastic crap from a 10 foot radius