Jennifer Wheeler shares “postcards” from her recent volunteer vacation in the Bahamas, where she sailed the ocean blue with a crew of dedicated conservationists. She shares stories from a week spent in the beautiful northern Exumas, surveying and banding shorebirds and seabirds, and removing invasive plants. 

Dear folks,

I’m recently back from my “volunteer vacation” in the Bahamas. I’m a bit burned, battered and bruised, but that’s the nature of the work we were doing to find and protect some special birds! Similar to last year, Conservian, a non-profit in Florida, invited BirdsCaribbean to share in the chartering of a sleep-aboard sailboat to take us from island to island. This photo was taken on a sunny afternoon, but much of the trip was overcast … too bad clouds don’t keep you from getting sunburned! (Photo by Dawn Rasmussen)

As you know, the Bahamas is made up of a lot of islands (about 700!) and during my week on the boat, the route focused on the Exuma Cays, which begin about 35 miles east-southeast of Nassau and stretch southeast in a gently curving arc for about 90 miles. Over a week, we visited the stretch between Allen Cay and Warderick Wells cay, which includes the Exuma Cays Land and Sea Park.

So what were we looking for?  Our primary targets were breeding populations of Wilson’s Plover, White-tailed Tropicbird and Audubon’s Shearwater. We deployed in teams to various cays to search the beaches and cliffs, walking many hours during the day (and sometimes night). We took note of other birds, as well, including American Oystercatchers, Laughing Gulls, and Least Terns. (Photo by Dawn Rasmussen)

Wilson’s Plover is a medium size (about 8” tall) shorebird that forages on the sand and wrack; pairs of plovers set up breeding territories widely separated along beach habitats. To find Wilson’s Plover, teams visited cays with suitable habitat and carefully walked the beach looking for adult birds to call out in warning. One or two adults chirping and/or pretending injury was a good sign that a nest was nearby. (Photo Bella Rooney)

Actually finding the plovers’ simple nest is not easy. The spotted eggs blend perfectly into their surroundings. Careful where you walk! (Photo by Dawn Rasmussen)

The White-tailed Tropicbird is a striking white bird, 14-16” long, not counting its long streaming tail feathers. To find these birds, one must do a lot of stooping and peering, as these beautiful birds nest in the holes and crevices formed in the wind and wave-carved limestone made of ancient corals (very, very sharp, by the way). We found most tropicbirds on a single egg or new chick; the males and females take turns in the burrow, waiting on average nine days until their turn to fly far out to sea to forage for squid, flying fish, and other prey. (Photo by Dawn Rasmussen)

In all, we found about 150 tropicbird nests on three different islands in the Exuma Cays Land and Sea Park. We banded 60 new birds and recaptured more than 10 that were banded in previous years. Though graceful in the air, in the hand these birds are fighters. The White-tailed Tropicbirds were none too pleased to be pulled from their nest holes and each came out screaming and biting. We took care to minimize the stress on the birds when handling and worked quickly to band them. (Photo by Lisa Ferguson)

Audubon’s Shearwater is another bird of the open ocean, which returns to land only in darkness and nests in natural cavities, under rocks, or in burrows it creates; it is a stocky, black and white bird, 12” from bill to tail. Surveying for shearwaters requires working at night. Being smaller, drabber, and more deeply tucked in than tropicbirds, shearwaters usually can’t be seen from the surface. Instead, a recording of courtship calls (or rather, screeches- listen below!) is played to prompt the birds to call out, sometimes from right beneath your feet. (Photo by Lisa Ferguson)

With a sleeping mat to cushion against sharp rock and vegetation, one can reach in to pull out struggling shearwaters, which fortunately are not able to bite nearly as hard as tropicbirds. We banded several, but it seemed as if shearwaters were taking a year off from breeding, something that is not uncommon when spring weather is bad (as it was this year). The good news is that the rodent traps that we set out for a week on Allen Cay yielded no mice! It would appear that the mouse eradication conducted in 2012 was successful. Mice did not directly harm the Audubon’s Shearwaters there, but their presence encouraged Barn Owls to settle on the island, which indiscriminately killed shearwaters. Also, a careful survey in daylight hours revealed very few fresh bird corpses – yay! (Photo by Jennifer Wheeler)

Keeping an eye on bird populations is important to conservation, but our project also involved taking action to help the birds. Caribbean bird populations today are just a remnant of the masses that once called the region home – historically reduced by human harvest, introduction of predators, and development and conversion of habitat to human uses. The small, uninhabitable cays and those in the Park are protected from development, but still threatened by alien species, and some cays are inhabited. In addition to bird sightings, teams recorded the state of the habitat and signs of threats, such as tire prints and footprints indicating human disturbance or predators. (Photo by Dawn Rasmussen)

Introduced mammals are a big problem for island birds. The Warderick Wells tropicbird colony is still recovering from its decimation by dogs several years ago. On this trip, we encountered dogs on Shroud Cay. They were very friendly, and you know I love dogs, but it was definitely not good to see them there! Dogs running free pose a threat to the birds, not to mention iguanas, hutias (native rodents), and other native species. (Photo by Dawn Rasmussen)

Introduced plants can also be a big problem. A prime example is Casuarina, or Australian Pine (Casuarina equisetifolia). The plant was originally brought to the region for landscaping and is now a scourge. Its fast growth and prolific seeding has distributed it to almost every island in the Bahamas, where its thick litter smothers native vegetation and increases beach erosion. We spent a full day killing casuarina on Shroud Cay, using axes to hack girdles and spraying an herbicide into the cuts. The “hack and squirt” method is quite effective, but hundreds of trees in, gets very tiring. Plus, the necessary gloves, glasses, long sleeves and pants makes for very hot work! (Photo by Lisa Ferguson)

All and all a great trip for me – the birds were awesome, my team members were great, the sailboat crew superb, the weather decent and no sea-sickness! It felt good to contribute to our knowledge of Bahamas birdlife and conservation efforts. I’m grateful to Margo Zdravkovic, Director of Conservian, for organizing the trip, Will Mackin, Co-chair of BirdsCaribbean’s Seabird Working Group, for leading the seabird monitoring work, the many volunteers who assisted with the work, and the fantastic captain and crew of the sailboat Avalon (charter them at Lost Island Voyages)! (Photo by Lisa Ferguson)

Love,

Jennifer

Jennifer Wheeler is an avid adventurer and loves volunteering her time to help conservation causes. She was the coordinator of the Waterbird Council for 10 years and is currently a member of the Board and Treasurer of BirdsCaribbean.

This trip was supported by BirdsCaribbean, Conservian, and many partners and donors. For more information about multi-week excursions that Conservian organizes to the Bahamas and the trip sponsors and partners, see the full trip description and visit Conservian’s Facebook page  

BirdsCaribbean is excited to announce 2018 awards for the David S. Lee Fund for the Conservation of Caribbean Birds. Five young scholars will carry out important research that will increase our knowledge of Caribbean birds and the actions needed to conserve them. The 2018 award recipients are Yvan Satge, Janine Antalffy, Juan Carlos Fernandez-Odoñez, Eduardo Manuel Llegus-Santiago, and Holly Garrod.

The David S. Lee Fund was established in 2016 to recognize the scientific and conservation efforts of David S. Lee, a biologist and naturalist dedicated to Caribbean biodiversity. The award funds innovative avian conservation research in the Caribbean. All projects demonstrate a commitment to engaging with local scientists, government officials, organizations and communities, as appropriate, to involve them in the research, share results, and build interest in local birds and their conservation. The projects are described below.

Thanks to support for the fund from a number of generous donors, BirdsCaribbean is able to provide a grant of $1,000 to each of the 2018 recipients. Congratulations to these dedicated and hard-working scholars, who we are confident will make important discoveries that will lead to enhanced conservation efforts and awareness of our amazing birds. Several students (Holly Garrod, Spencer Shubert, Maya Wilson, Paige Byerly) that received support last year have written blog articles sharing their exciting findings. We wish this new flock of Dave Lee award recipients all the best in their upcoming field seasons and look forward to hearing about their results in future articles and publications.

Foraging choices of the Diablotin Black-capped Petrel: using spatial ecology and diet to inform conservation

Yvan Satge, Clemson University

The Diablotin (Black-capped petrel; Pterodroma hasitata) is one of the most endangered seabirds in the western north Atlantic and one of only two extant seabird species endemic to the Caribbean. Although loss of terrestrial breeding habitat is a primary threat to the species, disturbances affecting the marine environment, which have been under-studied, are also likely to impact the survival of the population. Yvan Satge will study the diets of adult and juvenile Diablotin through novel DNA analysis of fecal samples collected at nest sites in the Dominican Republic. Data will inform conservation efforts by the Black-capped Petrel Working Group regarding use of marine resources by breeding Diablotin. The success of this project will be measured by evaluating diet composition and comparing those results to at-sea habitat use by tracked birds to assess the distribution of prey in the marine environment.

Conservation biology of the Bahama Oriole, a critically endangered island endemic

Janine Antalffy, University of Maryland, Baltimore County

The Bahama Oriole (Icterus northrop) is a critically endangered songbird restricted to the Andros island complex in The Bahamas. Having disappeared from the neighboring island of Abaco in the 1990s, a 2011 study suggested that fewer than 300 individuals remained on Andros. Little is known about life history traits and causes of population decline of this species. Janine’s research will contribute knowledge to inform conservation strategies for the species through addressing three questions about the Oriole, including assessing genetic diversity and connectivity between populations in the Andros Islands, assessing the response of this species to logging (to estimate population size during wholesale clearcutting in the mid 1900s), and distribution modelling to look at past populations on Andros and for the extinct Abaco population. These data will be useful for The Bahamas government to determine if the species should be managed as one or several populations, and to guide the reintroduction of the Bahama Oriole to Abaco.

Updating information about Audubon’s Shearwater (Puffinus lherminieri loyemilleri) at Los Roques archipelago (Venezuela)

Juan-Carlos Fernandez Ordoñez, Fundación Científica ARA MACAO

Audubon’s Shearwater (Puffinus lherminieri) is a small seabird that inhabits warm waters, mostly in the tropics. It breeds in colonies on islands and offshore cays. Once common, it’s status is now vulnerable due to disturbance and loss of breeding habitats. Audubon’s Shearwater is known to breed in the islands of the Los Roques archipelago off the Caribbean coast of Venezuela. Thanks to its strategic geographical location, the 314 islands, cays and islets of this archipelago provide important stopover and breeding sites for migratory and endemic birds. Juan-Carlos will revisit the remote and unspoiled Los Roques Archipelago to locate and survey nesting populations of Audubon’s Shearwater. JC will also identify and describe threats at the breeding sites. These colonies have not been visited in many decades, thus JC’s work will fill in major gaps in our understanding of of the status of these nesting populations. In his analysis, JC will test occupancy models as a much faster way of monitoring remote populations. He will share his results with local managers to aid conservation efforts in the archipelago.

Restoration and Monitoring of Nesting Areas of Shorebirds in the Punta Cucharas Natural Reserve, Ponce, Puerto Rico.

Eduardo Manuel Llegus-Santiago, University of Puerto Rico at Ponce

Eduardo will work to restore and monitor beach-nesting bird habitat in Punta Cucharas Natural Reserve, an estuary ecosystem located at southern Puerto Rico, in the City of Ponce . This community-centered project will rebuild fences that were created to protect birds from invasive dogs, cats, and vehicles during their nesting. The project includes the restoration of the fence and monitoring of the birds with volunteers and an educational program to teach local communities about shorebirds with the production of a bird guide for the area to stimulate bird-friendly tourism. Eduardo will also monitor survival rates of shorebirds in the restored area and compare them with other colonies within the natural reserve.

 A tale of two todies: understanding how vocalizations mediate hybridization between two sympatric species

Holly Garrod, Villanova University

Climate change and other human disturbances are causing range shifts in bird populations around the world. In some cases, species that were previously separated may come into contact and hybridize, which ultimately can result in long-term losses of biodiversity. In the Dominican Republic, Broad-billed and Narrow-billed Todies separate on an elevational gradient, with the Broad-billed Tody (Todus subulatus) in lowland wet forests and the Narrow-billed Tody (Todus angustirostris) in montane cloud forest. Climate change may push Broad-billed Todies upslope, increasing the overlap (sympatry)  in the two species’ ranges at mid-elevation. Increased competition and hybridization could disproportionately harm one of the species, most likely the Narrow-billed Tody, because the high-elevation tody has “nowhere to go.” Holly will use playback experiments to investigate the extent to which the two species recognize and respond to each as competitive threats (e.g., for males defending territories) and as potential mates. If species recognition mechanisms are imperfect, this could lead to hybridization. To date, one such hybrid has been documented. Holly’s research will likely yield important insights about different ways in which behavior mechanisms influence hybridization. Holly’s research in 2017 (supported with David Lee funds) examined nesting success of todies in different habitats – read about her exciting results here.

To learn more about the David S. Lee Fund for the Conservation of Caribbean Birds, click here. If you would like to contribute to the fund and help support future projects, click here. You can choose to designate your gift to the David S. Lee Fund.

BirdsCaribbean thanks the scientists that provided thoughtful and constructive reviews of the proposals. We are very grateful to all that have donated to the David S. Lee Fund. We are pleased and proud to honor Dave’s legacy with the funding of these exciting projects that will advance the development of young Caribbean scientists and contribute to the conservation of Caribbean birds.