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The Shallow-Water Crinoid Fauna of Kwajalein Atoll, Marshall Islands: Ecological Observations, Interatoll Comparisons, and Zoogeographic Affinities!

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The Shallow-Water Crinoid Fauna of Kwajalein Atoll, Marshall Islands: Ecological Observations, Interatoll Comparisons, and Zoogeographic Affinities! Pacific Science (1985), vol. 39, no. 4 © 1987 by the Univers ity of Hawaii Press. All rights reserved The Shallow-Water Crinoid Fauna of Kwajalein Atoll, Marshall Islands: Ecological Observations, Interatoll Comparisons, and Zoogeographic Affinities! D. L. ZMARZLy 2 ABSTRACT: Twelve species ofcomatulid crinoids in three families were found to inhabit reefs at Kwajalein Atoll during surveys conducted both day and night by divers using scuba gear. Eleven of the species represent new records for the atoll, and five are new for the Marshall Islands. A systematic resume of each species is presented, including observations on die! activity patterns, degree of exposure when active, and current requirements deduced from local distri­ butions. More than half of the species were strictly nocturnal. Densities of nocturnal populations were much higher than those typically observed during the day . Occurrence and distribution ofcrinoids about the atoll appeared to be influenced by prevailing currents. Some species, of predominantly cryptic and semicryptic habit by day, occurred at sites both with and without strong currents. While these species were able to survive in habitats where currents prevailed, they appeared not to require strong current flow. In contrast, the remaining species, predominantly large, fully exposed comasterids, were true rheophiles; these were found on seaward reefs and only on lagoon reefs in close proximity to tidal passes. Comparison of crinoid records between atolls in the Marshall Islands shows Kwajalein to have the highest diversity, although current disparities between atolls in the number of species recorded undoubtedly reflect to some extent differences in sampling effort and methods. Based on pooled records, a total of 14 shallow-water crinoid species is known for the Marshall Islands, compared with 21 for the Palau Archipelago and 55 for the Philippines. The Marshall Islands comatulid fauna is predominantly an attenuated western Pacif­ ic fauna, dominated by widely distributed members ofthe family Comasteridae. A field identification key for crinoids of the Marshall Islands is provided. OUR KNOWLEDGE of the occurrence and distri­ northeastern limit of distribution for Indo­ bution of shallow-water crinoids throughout West Pacific comatulids, which are absent the Indo-West Pacific is still very limited, due from the Hawaiian Archipelago. I have re­ in part to the vastness of the region and the ported (Zmarzly 1984) on the distribution of remoteness of many of its island groups. The shallow-water crinoids at Enewetak Atoll , crinoid fauna ofPalau, in the western Pacific, M.l., documenting the occurrence of six has recently been investigated (Meyer and species in three families. The reader is also Macurda 1980), but coma tulid crinoids in the referred to a short review of Enewetak central Pacific remain largely unknown. Crinoidea by Devaney (in press). The Marshall Islands occupy a key mid­ Records of comatulids from other atolls in Pacific position (Figure 1) and represent the the Marshall Islands are largely the result of three systematic collecting efforts, the earliest by the Swedish expedition totheSouth Sea 1 This research was supported by grants from the Foun­ Islands in 1917, the next during Operation dation for Ocean Research and Sigma Xi. Manuscript accepted May 1985. Crossroads in 1946, followed directly by the 2 Point Lorna Biology Laboratory, 4077 North Harbor Bikini Scientific Resurvey in 1947. The cri­ Drive, San Diego, CA 92101. noids from the Swedish expedition were re- 340 - , # t I k : . -e rtf' 'lMff¢tN, WmtttW!ili MW-M Shallow-Water Crinoid Fauna of Kwajalein-s-Zsrxnzt.v 341 1000E 140° 180 ° 160° 14 00W 400N ..---"T"-......",7'T'T:................r--.........r--........---i,.;;---"T"--+---,---r--r-----., 400N Pacif ic Ocean Hawa iian .'.s]ands 20° ...• 20° f sucm-' Enewetak* ' "Marsh all Kwojolein"*.:'::·.lslands ,• • Palau " 'S', I- Bikini " rR0ngelap • - 12°N P t kO .17 'Rongeri k "\ Enewe a r- Kw aj al ei~ Likiep' .: ,-:-~ .. ~ I- Ma rshall '\ • 8° d 200S Islands .. '" I- J ?lui.t~ A rn o~ Ebon_ I 16 2°E 166 ° 170 ° FIGURE I. Map of the Pacific Ocean, showing the location of the Marshall Islands. Inset shows location of atolls within the Marshall Islands. ported by Gislen (1940); those from the latter time. A field identification key for shallow­ two collection s were treated together by Clark water crinoids of the Marshall Islands is pro­ (1952). These reports documented a total of vided. Current Marshall Islands crinoid rec­ seven species from six atolls : Bikini, Ebon, ords are summarized , and crinoid faunas are Jaluit, Likiep, Rongelap, and Rongerik (Fig­ compared between atolls in the Marshalls and ure I). Coman thus bennetti, one of the seven between Indo-West Pacific island groups for species mentioned above, has also been re­ which comparable data exist. ported from Arno Atoll (Clark 1954) and from Enewetak and Kwajalein atolls as the host of a galatheid crab (Holthuis 1953), as MATERIALS AND ·METHODS the host of alpheid shrimps (Banner 1959; Banner and Banner 1968), as the host of Scuba diving surveys of the shallow-water pseudanthesiid copepods (Humes 1972), and crinoid fauna at Kwajale in were conducted in an echinoderm pigment study (Bartolini et both day and night over a 3-week period in al. 1973). December 1983. The sites investigated encom­ This paper presents the results ofa compre­ passed a depth range of 3 to 36m and are hensive survey of the shallow-water crinoid plotted in Figure 2. For logistic reasons, div­ fauna at Kwajalein Atoll (9°00' N, 167°40' E), ing effort was concentrated at the southern 485 km southeast of Enewetak. The survey end of the atoll , main ly on leeward seaward was conducted as part of a larger study on reefs due to the strength of the northeasterly Indo-West Pacific comatulids and their sym­ trade winds. When wind and tidal conditions biont faunas. Twelve comatulid species in permitted, crinoids were obtained from patch three families were collected; these are listed in reefs in Gea Pass and from a number of Table 1. The 24-hr exposure patterns ofmost lagoon pinnacles and patch reefs. Reefs at the species are described here, many for the first northern end ofthe lagoon (near North Pass) 342 PACIFIC SCIENCE, Volume 39, October 1985 TABLE I CRINOIDEA OF KWAJALEIN ATOLL FAMILY AND SPECIES CLOSEST PREVIOUS RECORD COMASTERIDAE Coman theria briareus (Bell) Palau, C. I. Comanthina schlegeli (P. H. Carpenter) Enewetak, M. I. Comanthus bennetti (J. Muller) Kwajalein, M . I. Comanthus parvicirrus (J. Muller) Enewetak, M. I. Comaster gracilis (Hartlaub) Bikini, M. I. Comaster multifidus (J. Muller) Gilbert Islands Comatella maculata (p. H. Carpenter) Truk and Mortlock, C. I. Comissia sp. cr. C. pectinifera A. H. Clark Kei Islands (c. pectinifera) MARIAMETRIDAE Lamprometra palmata (J. Muller) Likiep, M.1. Liparometra regalis (P. H. Carpenter) Tonga Stephanometra indica (Smith) Rongelap and Rongerik, M. I. COLOBOMETRIDAE Cenometra bella (Hartlaub) Jaluit Atoll, M. I. were surveyed for species present during two pinnules. Attachment by the lower arms dives. Consecutive day and night surveys at a created a pedestal which elevated the calyx single locality enabled determination of the several centimeters above the substrate (Fig­ diel activity patterns ofmost species. ure 3B). Crinoids were identified by using both the This species was observed only on seaward key of Clark and Rowe (1971) and the sys­ reefs at Kwajalein, at depths exceeding 22 m. tematic descriptions given by Clark (1931, In Palau, Meyer and Macurda (1980) found 1941, 1947). D. L. Meyer, University ofCin­ C. briareus no deeper than 12m, but the cinnati, kindly provided taxonomic advice. behavior and bathymetric distribution of Representative specimens will be deposited another form, which they referred to as with the Division of Invertebrate Zoology, Comantheria sp. cr. C. briareus, was similar Bernice P. Bishop Museum, Honolulu. to that of specimens referred to here as C. briareus. A very consistent, striking coloration was noted for this species. The division series and COMASTERIDAE brachials were greenish yellow. Some pin­ Comantheria briareus (Bell) nule groups were black with white tips; these groups alternated with groups of pinnules This species has not been reported previ­ which were proximally white, then black with ously from the Marshall Islands. Clark and white tips (Figure 3B). Rowe (1971) showed records of Comantheria briareus concentrated in the western Pacific. Comanthina schlegeli (P. H. Carpenter) Its range was only recently extended to Palau (Meyer and Macurda 1980), which represents Comanthina schlegeli, previously reported the closest previous record. from Enewetak Atoll (Bruce and Zmarzly Comantheria briareus, the largest comatulid 1983; Zmarzly 1984), has not been recorded at Kwajalein, characteristically appeared as a elsewhere in the Marshall Islands. dense mass of arms . Individuals were con­ Individuals were fully exposed on coral spicuous on prominent coral or limestone pro­ substrates both day and night. This crinoid jections both day and night. Since C. briareus was typically found on seaward reef slopes totally lacks cirri (Figure 3A), animals were between 6 and 20 m depth, although occur­ tethered to their perch by the lower arms and rence was patchy. Juveniles (10 to 12 arms /~ R o i - N a m u r North p~/~I ~\\.. , , r/0· .\. = d ~ \ lagoon " " • , Kwajalein Atoll t ~ N .1 I 8 \~ ' P '" South Pass• FIGURE 2. Map of Kwajalein Atoll, showing locations of sites surveyed for crinoids in the present study. Note especially the location of sites relative to major tidal passes. 344 PACIFIC SCIENCE, Volume 39, October 1985 FIGURE 3. A, Aboral view of Comantheria briareus, showing centrodorsal (2.5 mm in diameter) devoid of cirri. B, Posture of Comantheria briareus in situ. Note that the lower arms are used to tether the animal to its perch. Arrow indicates levelofelevation ofcalyx above substrate. Arm length (free arm) about 14em.CiComanthina schlegeli in situ, showing cirri (indicated by arrow) grasping a branch ofMillepora.
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