MONTHLYMONTHLY BULLEBULLETINTIN ofof thethe CAYMANCAYMAN ISLANDSISLANDS DEPARDEPARTTMEMENTNT ofof ENVIRONMENTENVIRONMENT TETERRESTRIALRRESTRIAL ECOLOGYECOLOGY UNUNIITT

Storm Survivors…

The endangered Cayman Brac Parrot Amazona leucocephala hesterna 1 has the smallest range of any Amazona parrot in world, making it particularly vulnerable to environmental disturbance. Recent years have seen increasing deforestation on Cayman Brac, impacting vital habitat for the parrots. The forest also serves as an important refuge for migratory , and accordingly, it has been designated an Important Area by Birdlife International. Nevertheless, only 113 ha are currently protected; the National Trust’s Bract Parrot Reserve .

In July 2008, a population monitoring programme was initiated by the Department of Environment (DoE), with the assistance of Frank Rivera‐Milán (USFWS). Four months Cayman Brac Parrots

later, Hurricane Paloma swept across the island, stripping most of the forest of its foliage, leaving little cover or available food for the parrots 2. When Hurricane Ike hit Inagua (Bahamas) two months earlier, many of the surviving parrots later starved 3. Now, our Brac parrots faced a similar fate. Given their already endangered status, the DoE implemented a period of emergency feeding, to tide the birds through the lean times ahead.

A month later, the forest began to recover and bear fruits, albeit in relatively small quantities. Now, almost a year later, though Robert Walton (DoE) preparing food the canopy is still very open, the forest is bearing fruits in abundance. Unfortunately, subsequent pre‐ and post‐ reproduction surveys still showed a significant population decline in the wake of the storm (Table 1. DoE, unpublished data). Historically, the parrot population was robust enough to recover from powerful storms, however, current habitat loss may hamper the ability of the population to recover naturally. Our Cayman Brac parrots are threatened with extinction, and urgent action is required to conserve them. The DoE is initiating further research centred around a Species Action Plan 4 for both the Cayman Brac Parrot and the Grand Cayman Parrot Cayman Pygmy Blue Amazona l. caymanensis. This research will take the form of a PhD study, the Pygmy Blue News… results of which will be developed into a The endemic Cayman Pygmy Blue conservation management plan. Brephidium exilis thompsoni may be the smallest butterfly in the world. It inhabits 800 Hurricane small pockets of high alkaline salt marsh, Paloma 700 where the salt‐tolerant plants on which it depends, such as Glasswort Salicornia 600 perennis and Sea Pusley Sesuvium portulacastrum, are to be found 5.

) 500 n on (

i Recent vegetation mapping and aerial t 400 a photography produced under the Darwin pul o

P 300 Initiative, have helped pin‐point potential habitat pockets for this species, and upon 200 closer inspection on the ground, DoE has discovered several new populations of 100 these tiny butterflies. 0 References Jul 08 Mar 09 Jul 09 1. Snyder, et al. (eds) (2000) Parrots. Status and Survey and Conservation Action Plan 2000‐2004. IUCN, Gland, Table 1. Estimation of the Brac parrot population Switzerland and Cambridge, UK. x + 180 pp. ISBN: 2‐8317‐ before and after Hurricane Paloma (Oct 2008), 0504‐5 5. within 95% CI. 2. Godbeer, K.D. (2008) Rapid Environmental Assessment of Cayman Brac Hurricane Paloma 13‐14th Nov 2008. Government. Department of Environment. TEXT For more information www.doe.ky TEXTKristan D. Godbeer on Cayman Parrots 3. Pers. Com., Henry Nixon, Bahamas National Trust MatMat DaCDaCostaosta‐Cottam‐Cottam and the Island’s 4. DaCosta‐Cottam, et al. (2009). Cayman Islands National Biodiversity Action Plan 2009. Cayman Islands Government. birdlife see our Department of Environment. www.doe.ky PHOTOSPHOTOS Kristan D. Godbeer © ‘Virtual Bird Guide’. 5. Askew, R. R. & Stafford, P.A. van B. (2009) Butterflies of Kristan Godbeer the Cayman Islands. Apollo Books. ISBN: 978‐8788757‐85‐9

Department of Environment PO BOX 486, 580 North Sound Rd. GRAND CAYMAN KY1‐1106 TEL: (345) 949‐8469 www.DoE.ky www.CaymanBiodiversity.com CONTENTS

In this issue

1 Storm Survivors Kristan D. Godbeer & Mat DaCosta‐Cottam The DoEs efforts to conserve the endangered Cayman Brac Parrot. 1 2 Pygmy Blue News

4 Essays and Notes

The Vitelline Warbler Dendroica vitellina,a Western Caribbean 2 4 endemic Kristan D. Godbeer

8 Bookshelf Butterflies of the Cayman Islands

8

3 Flicker (2009) 2, 4-7 Essays and Notes

The Vitelline Warbler Dendroica vitellina, a Western Caribbean endemic

Kristan D. Godbeer Department of Environment – Terrestrial Ecology, Cayman Islands

The Vitelline Warbler Dendroica vitellina, known colloquially in the Cayman Islands as the ‘Chip chip’[1], is a West Indian endemic, and a restricted range species [2]. Three sub-species are recognised. D. v. vitellina of Grand Cayman, D. v. nelsoni of the Swan Islands (Isla de Cisne), and D. v. crawfordi of Cayman Brac and Little Cayman, [2, 3, & 4]. The species is morphologically similar to the D. discolour [3 & 5]. For a while there was a degree of uncertainty regarding its taxonomic status [6]. Subsequent molecular analysis firmly supports the species status of the Vitelline Warbler, and its divergence from its sister taxa, the Prairie Warbler [4]. Furthermore, the magnitude of mitochondrial differentiation supports the Above: D.v.crawfordi, Cayman Brac & Little current subspecies separation [4]. Cayman. Below: D. v. vitellina, Grand Cayman.

Habits Haematoxylum campechianum stands [1 D. v. vitellina is a locally common & 7], especially where these are resident on Grand Cayman. It can be seen contiguous with primary habitat. The actively foraging in shrubland and forest, birds are mainly insectivorous, but also from the rocky karst limestone floor to the take fruit and nectar [8]. canopy. Occasionally Vitelline Warblers can be observed in remnant forest D. v. crawfordi is common throughout the fragments, urban gardens, the edge of sister islands, and is noticeably bolder wetlands and exotic Logwood than its Grand Cayman cousin. On

4 The Vitelline Warbler – K. D. Godbeer

to the avifauna of Grand Cayman, and D. v. vitellina was not immune [7]. Cayman Brac is seeing increasing development, with new roads and sub-divisions further penetrating the forested Plateau known locally as the Bluff. Since Diamond’s description of a relatively undisturbed Little Cayman [9], a new road now bisects the island, further opening the interior to the possibility of development. The many roadside realty signs, suggest hopes for future development, and a new larger airport for Little Cayman, has been under consideration for some time.

Presently the Cayman Islands have no legislation requiring an environmental impact assessment for development. Currently, no law protects the flora of the Cayman Islands, and no law provides a framework for the establishment of a system of terrestrial protected areas. Typical Vitelline Warbler habitat. Top: Xeric Shrubland, Little Cayman. Bottom left: Invasive predators such as the rat Rattus Xeromorphic Forest, Cayman Brac. Bottom right: norvegicus and the feral cat Felis catus Dry Forest, Grand Cayman. [7], are likely taking their toll on the Cayman Islands populations, especially in Cayman Brac they can be readily observed urban and suburban areas. in the interior of the forested bluff, and on edges and in contiguous shrubland, such as the salt water pond trail and above Peter’s Cave. Of the three Cayman Islands, Little Cayman is by far the least impacted by development. The species is common across the island.

Threats Grand Cayman has seen rapid development in recent years, with around fifty percent of the island now given over Deforestation on the Bluff, Cayman Brac. to man modified habitat. In 2004, Hurricane Ivan dealt a devastating blow

5 The Vitelline Warbler – K. Godbeer

In 1998 Hurricane Mitch swept across the Within the jurisdiction of the Cayman Swan islands with speeds up to 180 mph; Islands, the species is currently protected the affect on the population of D. v. under the Law (1976). Pending nelsoni remains unknown. Proposals to legislation, it would be protected under develop the Swan Islands, for tourism and schedule one of the National Conservation island living, may further threaten the Law [7]. This law would also facilitate the continued existence of this subspecies. creation of terrestrial protected areas. Furthermore, the SAP proposes a status Conservation assessment of the three Vitelline Warbler The Vitelline Warbler is listed as a populations, to be headed by the DoE [7]. restricted range species [2], and is An established population baseline will considered near threatened [10], but little provide a platform for long-term is known about the populations. The monitoring and conservation efforts. Cayman Islands Department of Environment (DoE) has completed References accurate habitat maps of the three Cayman 1. Bradley, P. E. (2000). The Birds of the Islands, which will facilitate the Cayman Islands. British Ornithologists’ quantification of suitable breeding habitat Union, BOU Checklist Series 19. ISBN for this and other species. Some areas 0907446 23 X have already been designated as 2. BirdLife International (2008) Important ‘Important Bird Areas (IBAs)’ by the Bird Areas in the Caribbean: key sites for Caribbean IBA Program [2]. Whilst IBA conservation. Cambridge, U.K.: BirdLife status highlights areas important for International. (Birdlife Conservation endemic and restricted range avian Series No.15). species, it does not legally designate the 3. Curson, J., Quinn, D., and Beadle, D. site a protected area. A few IBAs are (1994) New World Warblers. Christopher owned and protected by the National Helm (Publishers) Ltd, London. ISBN: 0- Trust. The majority remain in private 7136-3932-6. ownership. 4. Markland, H. M. and Lovette, I. J. (2005) Phylogentic affinites and inter- The Cayman Islands National Biodiversity island differentiation in the Vitelline Action Plan [7], includes a Species Action Warbler Dendroica vitellina, a West Plan (SAP) for the Vitelline Warbler and Indian endemic. Ibis 147: 765-771. its associated habitats. The SAP centres 5. Raffaele, H., Wiley, J., Garrido, O., on habitat management plans, and a Keith, A. & Raffeale, J. (1998) Birds of system of protected areas, the the West Indies. Christopher Helm Ltd., modification of existing planning laws, 35 Bedford Row, London WC1R 4JH. the introduction of Environmental Impact ISBN: 0-7136-4905-4. Assessments (EIAs), and the 6. Mayer & Short (1970) cited in encouragement of native landscaping in Markland, H. M. and Lovette, I. J. (2005) developed areas.

6 The Vitelline Warbler – K. Godbeer

Phylogentic affinites and inter-island differentiation in the Vitelline Warbler Dendroica vitellina, a West Indian endemic. Ibis 147: 765-771. 7. DaCosta-Cottam, M., Olynik, J., Blumenthal, J., Godbeer, K. D., Gibb, J., Bothwell, J., Burton, F.J., Bradley, P.E., Band, A., Austin, T., Bush, P., Johnson, B.J., Hurlston, L., Bishop, L., McCoy, C., Parsons, G., Kirkconnell, J., Halford, S. and Ebanks-Petrie, G. (2009). Cayman Islands National Biodiversity Action Plan 2009. Cayman Islands Government. Department of Environment. www.doe.ky 8. Bradley, P.E. and Rey-Millet, Y (1995) Birds of the Cayman Islands. Caerulea Press, Italy. ISBN: 976-8052-10-4. 9. Diamond, A. W. (1980) Ecology and Species Turnover of the Birds of Little Cayman. Atoll Research Bulletin, 241, 141-164. 10. IUCN Redlist. Accessed Sept 2009 http://www.iucnredlist.org/

7 Bookshelf

Butterflies of the Cayman Islands

Most of us will be familiar with one or two of Cayman’s commoner butterflies. Take a closer look, however, and you may discover that your garden or hedgerow plays host to an unexpected variety of these delicate creatures.

The recently published Butterflies of the Cayman Islands is a compact, hardback volume, rugged enough to withstand the rigors of the most challenging back yard foray. Full-colour images depict our butterflies in all their natural glory, while the detailed, but accessible, text includes helpful hints on points of identification, and descriptions of the plants on which the caterpillars and adults feed – of particular interest to readers keen to attract more butterflies to their gardens. Available from local bookshops, and the So, if you are struggling to tell your National Trust for the Cayman Islands. “Drury’s Hairstreaks” from your “Pygmy Blues”… Butterflies of the Cayman R. R. Askew & P. A. van B. Stafford Islands may point you in the right Apollo Books direction. ISBN: ISBN: 978-8788757-85-9