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A Survey of Butterflies from Aruba and Bonaire and New Records for Curaçao

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A Survey of Butterflies from Aruba and Bonaire and New Records for Curaçao Caribbean Journal of Science, Vol. 39, No. 2, 170–175, 2003 Copyright 2003 College of Arts and Sciences University of Puerto Rico, Mayagu¨ez A Survey of Butterflies from Aruba and Bonaire and New Records for Curaçao J. Y. MILLER1,A.O.DEBROT2 AND L. D. MILLER1 1Allyn Museum of Entomology, Florida Museum of Natural History, 3621 Bay Shore Rd., Sarasota, FL 34234. [email protected] 2Carmabi Foundation, Piscaderabaai z/n, P. 0. Box 2090, Curaçao, Netherlands Antilles Abstract.—We document 29 butterfly species for the island of Aruba and 32 for Bonaire. We also document five new records for Curaçao, increasing the total to 58 species. The three islands have inherently similar faunas but those of Aruba and Bonaire are significantly impoverished compared to Curaçao. The decreased diversity is ascribed to human intervention and degradation of the environment. INTRODUCTION (Freitas and Rojer, 2000). Curaçao, the larg- est of the three islands, has an area of 444 km2 and receives an average rainfall of 567 The three tropical arid Dutch islands of mm/y. The island has dense secondary Aruba, Curaçao, and Bonaire, a chain woodlands and its flora numbers 491 spe- of Antilllean islands off the coast of north- cies (Beers et al., 1997). ern Venezuela, are bordered by the Los Roques Trench to the north and the Bonaire Trench to the south. Debrot et al. (1999) METHODS documented 53 butterflies for Curaçao, the larger central island, but nothing has The end of the rainy season and its asso- been published on the diversity of the ciated verdant vegetation normally extends butterfly fauna of Aruba and Bonaire. until the middle or end of March in the We report herein on butterflies collec- leeward Dutch Antilles. During this period ted recently on Aruba and Bonaire, and butterfly abundance is high. The second provide five new species records for author visited six sites on Aruba and six on Curaçao. Bonaire (Fig. 1) during March 3-14, 2000. Aruba lies 75 km west of Curaçao and 30 Sites included habitats ranging from dis- km north of the Venezuelan mainland. Its turbed suburban habitat to natural springs, surface area is approximately 190 km2 and deciduous woodland, evergreen wood- its highest point is the 189 m Jamanota hill. land, coastal marsh, and mangrove areas. Rainfall averages 426 mm/y and the veg- The butterflies observed during up to3hof etation is typically xerophytic. Landscapes effort per site were recorded or collected are dominated by sparse low scrub growth for identification. With the exception of and the flora numbers 303 species (Stoffers, Phoebis argante for Bonaire and Phoebis aga- 1981; Freitas, 1996; Freitas and Rojer, 2000). rithe for Aruba, whose records are based on Bonaire lies 75 km east of Curaçao and 90 sightings, voucher specimens of the other km north of Venezuela. Its surface is ap- species are deposited in the collections of proximately 288 km2 and its highest point the Allyn Museum of Entomology, Florida is the 241 m Brandaris hill. Rainfall aver- Museum of Natural History. ages 504 mm/y and the vegetation is Since Aruba and Bonaire are smaller and xerophytic. There are large tracts of dense their habitats are severely degraded com- scrubland (3-4 m high) and evergreen pared to those of Curaçao, we hypoth- woodlands, especially on the northern half esized that the number of butterfly species of the island. The flora numbers 353 species on these two islands would be lower than 170 ARUBA AND BONAIRE BUTTERFLIES 171 in Curaçao. However, a direct comparison most common species (represented in at of butterfly numbers is premature because least four sites) were Danaus plexippus, Stry- our sampling occurred in one month as op- mon bubastus, Leptotes cassius, Hemiargus posed to 13 months surveyed for Curaçao hanno, Kricogonia lyside, Phoebis sennae, and by Debrot et al. (1999). Based on habitat Lerodea eufala. The fauna was largely di- availability and condition on Aruba and vided among the Lycaenidae (8 spp.), Pieri- Bonaire, we also hypothesized that species dae (8 spp.), and Hesperiidae (10 spp.). with small populations on Curaçao (rare or Nymphalidae were notably rare, amount- uncommon in Debrot et al., 1999) would be ingtoonly3%ofthedocumented fauna as less well represented on Aruba and Bonaire opposed to almost 20 % of the fauna on than the hardy generalist species character- Curaçao (Debrot et al., 1999). Twenty-two ized as common or abundant on Curaçao. To of the 26 species characterized as abundant test this hypothesis we compared the two or common in Curaçao were documented on faunas using a Chi-square Test of Indepen- Aruba, whereas only 7 of the 31 species dence with Yate’s correction for continuity characterized as rare or uncommon were (Walpole and Myers, 1978) noted (X2 = 19.82, df = 1, p < 0.005). Twenty-nine species were collected on Bonaire, which again indicates a peak of RESULTS butterfly abundance. When three species Table 1 shows the species documented collected from previous trips are included for Aruba and Bonaire, respectively. (Hypolimnas misippus, on the top of Bran- Twenty-nine species were collected on daris, October 1991; Phoebis argante, ob- Aruba, which is comparatively high for a served in October 1996 on Klein Bonaire; single collection period (Debrot et al., 1999) and Brephidium exilis, collected in Septem- and suggests that collection occurred dur- ber 1999 at Goto), the number of species ing a peak of butterfly abundance. The known from the island increases to 32. The FIG. 1. Maps of Aruba and Bonaire showing the location of the six collection sites for each island. 172 J. Y. MILLER ET AL. TABLE 1. Butterfly records per survey site for the islands of Aruba and Bonaire, March, 2000. Asterisks indicate species not recorded at location in March, 2000. Aruba Mangel Site name Playa Haltu Masiduri Papilon Jamanota Fontein Site number 1 2 3 4 5 6 Other Danaidae Danaus plexippus megalippe (Hu¨ bner) x x x x x Nymphalidae Hypolymnas misippus (Linn.) Junonia genoveva (Cramer) Anartia j. jatrophae (Linn.) x x Heliconiidae Dryas iulia alicionea (Cramer) Agraulis v. vanillae (Linn). x x x Heliconius erato hydara (Hewitson) Riodiniidae Theope virgilius (Fabricius) Lycaenidae Chlorostrymon s. simaethis (Drury) C. telea (Hewitson) x Ministrymon azia (Hewitson) x Ministrymon ligia (Hewitson) x x Electrostrymon nubes (H. H. Druce) x S. b. bubastus (Stoll) x x x x Leptotes c. cassius (Cramer) x x x x x Brephidium exilis ssp. (Boisduval) x Hemiargus h. hanno (Grose-Smith) x x x x x x Pieridae Appias d. drusilla (Cramer) x x x Ascia m. monuste (Linn). x Eurema elathea (Cramer) x x E. gratiosa (Doubleday) E. lisa euterpe (Boisduval & LeConte) x x x E. p. proterpia (Fabricius) x Kricogonia lyside (Godart) x x x x Phoebis a. argante (Fabricius) P. agarithe (Boisduval) x x P. s. sennae (Linn.) x x x x Hesperiidae Chiodes c. catillus (Cramer) Urbanus d. dorantes (Stoll) x x x Calpodes ethlius (Stoll) x Gesta gesta (Herrich-Schaeffer) x x x Zopyrion satyrina (C. & R. Felder) x x Pyrgus adepta (Plo¨tz) x x x Heliopetes d. domicella Erichson x x x Hylephila phyleus (Drury) x x Atalopedes clarkei Burns x Leroda eufala (W. H. Edwards) x x x x Panoquina p. panoquinoides (Skinner) x Total species 12 7 9 19 11 13 2 ARUBA AND BONAIRE BUTTERFLIES 173 TABLE 1. Continued. Bonaire Klein Wash./ Kralendijk Bonaire Karpata Dos Pos Rincon Slagbaai 1 2 3 4 5 6 Other xx x x* x x xx xxxxxx x xx* x x x xxxxxx xx x x* xxxxxx x xx x xxxxx x x x* x xxxxxx xx xx xx xx x x xxxxx xx x xxxx x x 13 10 12 12 14 15 2 174 J. Y. MILLER ET AL. only species for which we found earlier re- raised on Senna obovata (its native larval cords of collection from Bonaire is Theope host plant) and the non-native Glircidia se- virgilius from Dos Pos (2 (; 15.i.1961; B. pium (M. Koomen, pers. comm.). One Heineman; AMNH). Whereas 20 of the 26 Aphrissa statira (Cramer) was collected at species characterized as common or abun- Sta. Martha Grandi in May 2002. All new dant in Curaçao were documented for Bo- records for Curaçao can be considered as naire, only 12 of the 31 species character- rare (sensu Debrot et al., 1999). A species ized as rare or uncommon were found in that Debrot et al. (1999) previously re- Bonaire (X2 = 6.27, df = 1, p < 0.025). The ported as near M. maevia has been correctly most common species (represented in at identified (JYM, LDM) as Ministrymon ligia least four sites) were Agraulis vanillae, Stry- (Hewitson). These five additional species mon bubastus, Hemiargus hanno, Eurema lisa, records increase the butterfly fauna of Phoebis sennae, Chioides catillus, Pyrgus Curaçao to 58 species. adepta, and Lerodea eufala. Again, the fauna was largely divided among the Lycaenidae (6 spp.), Pieridae (9 spp.), and Hesperiidae DISCUSSION (9 spp.). As in Aruba, Nymphalidae were very rare. Our principal surveys for this study were A notable difference between islands conducted at the end of the extended rainy (based on two visits in October 1996 and season, when peak vegetation conditions September 1999) was the greater abun- occur. Thus, the butterflies documented dance of Phoebis argante and P. agarithe on here are most likely a characteristic sample Bonaire compared to the two other islands. of the insular butterfly faunas. Although On Bonaire, these two species are most of- our limited survey is probably incomplete, ten seen associated with the shrub Senna some comparison of butterfly faunas bicapsularis and the shrubby tree Pithecello- among these sister islands is possible.
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