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Ecology and Classification of Bahamian Cytherellidae (Ostracoda)

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Ecology and Classification of Bahamian Cytherellidae (Ostracoda) ABSTRACT Four species {three new) of Ostracoda belonging to the family Cytherellidae, collected in the vicinity of Bimini, Bahamas, are described. The influence of water depth, salinity, substrate, and temperature on the distribution of cytherellids is dis- cussed. It is tentatively concluded that cytherellids are restricted to water having salinities above 25 parts per thousand and depths less than 2000 meters. Ecology and classification of Bahamian Cytherellidae (Ostracoda) LOUIS S. KORNICKER. Agricultural and Mechanical College of Texas College Station, Texas INTRODUCTION This paper is the fourth in a series describing Bahamian the Humble Oil and Refining Company, and the Shell Ostracoda and considering ostracode ecology. Previous Development Company. The writer was assisted in the papers are "Ecology and taxonomy of Recent marine initial phases of the present study by a grant from the ostracodes in the Bimini area, Great Bahama Bank" Esso Educational Foundation. He wishes to express his (Kornicker, 1958), "Distribution of the ostracode sub- appreciation to Mr. I. G. Sohn and Dr. Harbans S. order Cladocopa, and a new species from the Bahamas" Puri for helpful criticism of the manuscript. Figured (Kornicker, 1959), and "Ecology and taxonomy of specimens have been deposited at the U. S. National Recent Bairdiinae (Ostracoda)" (Kornicker, 1962). Museum, Washington, D. C. This paper is a contribu- Collections were made in the vicinity of the Bimini tion from the Department of Oceanography and Me- Islands, which are situated in the northwestern part of teorology of the Agricultural and Mechanical College the Great Bahama Bank. The collecting localities are of Texas. shown in text-figure 1. The ostracode family Cytherellidae has within it two OSTRACODE ECOLOGY genera, Cytherella and Cytherelloidea, that range from Distribution of cytherellids in the diverse environments Jurassic to Recent. These two genera are represented of Bimini is shown in text-figure 2. Environmental by four species in the Bimini area. Knowledge of the factors of water depth, salinity, substrate and tempera- ecology of living ostracodes whose ancestors have a ture that may influence the distribution of Ostracoda long geologic history may be useful to paleontologists are considered below. using ostracodes as a means of interpreting ancient environments. Ecological studies in the Bahamian area have especial significance because the Bahamas may Collections from Bimini were obtained in shallow water have similarities with depositional environments wide- less than 24 meters deep, with few samples collected in spread in the past. water deeper than 17 meters. Cytherellids were present in samples from all depths, but they were more abun- dant in samples collected in water less than 3 meters ACKNOWLEDGMENTS deep. Roughly 35 per cent of samples from water less than 3 meters deep contained cytherellids, compared The base for the field work in Bimini was the Lerner with only 23 per cent from water 3-6 meters deep and Marine Laboratory of the American Museum of 15 per cent from water 6-17 meters deep. Natural History. Summer collections were made by the writer while a member of a field group making a bio- The collections from the early exploration of the geologic survey of the northwestern part of the Great Challenger Expedition (Brady, 1880) indicate that Bahama Bank under the direction of Professors Norman cytherellids are absent from abyssal depths (table 1). D. Newell and John Imbrie. The writer is indebted for Cytherellids were also absent from deep-sea cores field assistance to Dr. Edward Purdy, Mr. Robert obtained in the North Atlantic in water ranging in Adlington, and Dr. Robert J. Menzies. Field collections depth from 1380-4820 meters (Tressler, 1941). Why the were made within the framework of a project supported ostracode suborder Platycopina, containing genera by financial grants-in-aid from Columbia University, ranging from Jurassic to Recent, with species abundant micropaleontology, vol. 9, no. 1, pp. 61-70, January, 1963 61 KORNICKER 33 NORTH ROCK EAST WELLS EAST BIMINI «,«^ V;o* » £"S -^ "*?,8i; " s *,„ '"' ; •i* •I ,9? TEXT-FIGURE 2 DISTRIBUTION OF CYTHERELLIDAE AT BIMINI Cytherellidae were collected at stations indicated by filled-in circles and were absent at those shown by open circles. Sample stations are numbered. and Cytherellapulchra Brady confined to depths exceeding 20 meters in the Gulf of Paria. Pun and Hulings (1957) reported Cytherella sp. to be restricted to 14-21 meters in the Gulf of Mexico off the Panama City area, Florida. Curtis (MS., 1958) found Cytherelloidea sp. cf. C. obtusata (Miiller) to be restricted to 15-25 meters, Cytherella TEXT-FIGURE 1 polita Brady to be rare in depths less than 15 meters, LOCALITY MAP OF BIMINI ISLANDS and Cytherella lata Brady to be characteristic of a depth zone of 5-15 meters in the Gulf of Mexico off the Missis- sippi delta. Hulings (1959, p. 159) found the genus in shelf and slope waters of modern seas, is not repre- Cytherella to be one of the genera characterizing a zone sented at abyssal depths is a question not answerable between 200 and 760 meters off the southern Atlantic at the present time. Its absence at abyssal depths, where coast of the United States, between Cape Hatteras, environmental conditions have remained relatively North Carolina, and south of Cape Canaveral, Florida. constant, suggests that the suborder did not occupy this region during past ages. Salinity Some species appear to be restricted to certain depths. Some typical salinity values from the vicinity of Bimini Kruit (1955, p. 475) collected Cytherella laevis Brady reported by Turekian (1957) are listed below: only at depths greater than 10 meters, with the maxi- Area Salinity mum occurrence at a depth of 20 meters, in the Golfe (parts per thousand) de Fos (Rhone delta). This species had previously been Florida Straits (near Bimini) 35.85-35.92 recorded from depths between 100 and 700 meters off Great Bahama Bank (near Bimini) 37.50 the west coasts of Africa and Europe (Brady, 1866; North Bimini Harbor 36.10-39.40 Brady, 1868; Brady and Norman, 1896). Kruit (in North Sound 40.00-46.50 Andel and Postma, 1954) found Cytherella lata Brady Cavelle Pond, South Bimini (one sample) 31.52 62 BAHAMIAN CYTHERELLIDAE A series of samples collected on June 6, 1955, from gray ooze, and hard ground, but did not collect any North Sound showed the salinity to increase from 39 in Globigerina ooze, red clay, or volcanic sand, which parts per thousand at the lower end to 45 parts per were mostly restricted to abyssal depths, where cyther- thousand at the upper end. Specimens of Cylherella ellids were not found. Muller (1894, p. 386) collected aroslrala n. sp. and Cylherella harpago n. sp. with append- Cylherella sordida Muller in the Gulf of Naples on shell ages inside were abundant in dried samples collected detritus. At the species level, the substrate may limit the from North Sound, indicating that these species are distribution; e.g., Benson (1959, p. 39) found Cylherella able to live where salinity is higher than normal marine. bandaBenson restricted to a very fine sand to coarse silt, A few specimens of C. aroslrala were also collected alive and Hulings (MS., 1958) found species of Cylherella and in this area. Collections included juveniles, gravid Cylherelloidea restricted to certain substrates. females, and mature males; however, males were more abundant than females in North Sound, which is the Temperature opposite of the female-to-male ratio observed in other areas of Bimini. The fact that some cytherellids are able Water temperatures in the Bimini area, during the to live where salinities are higher than normal marine time when collections were made in the present study, (30-40 parts per thousand) is supported by the investi- ranged from 24° to 32°C. A low temperature of 14°C. gations of Kruit (1955), who collected Cylherella laevis was recorded in the Bimini Lagoon by Dr. Louis A. Brady in the Golfe de Fos, where surface salinities were Krumholtz (personal communication, 1956) on Janu- recorded as 39-45 parts per thousand. ary 12, 1956, at which time dead fish were observed floating in the lagoon. Cytherellids were found alive in Carapaces of Cylherella aroslrala n. sp. containing ap- the Bimini area in sediments collected in water having pendages were collected in Cavelle Pond, where a a temperature of 24°-32°C. Cytherellids have been salinity of 31 parts per thousand was reported by reported from much lower temperatures, e.g., Brady Turekian (1957). Cytherellids apparently do not (1880, p. 23) collected Cylherella punclala Brady and populate water having a salinity much lower than 30 Cylherella lala Brady in water at 4.9°C. off Ki Island, parts per thousand, which is considered by Hedgepeth and Cylherella abyssorum has been found in cold, deep (1951) to be the lower limit of normal marine water. waters off Norway (Sars, 1923). Elofson (1941) con- Benson (1959) reported Cylherella banda Benson and sidered Cylherella abyssorum to have a temperature range Cylherelloidea californica LeRoy from the Todos Santos of 0° to 11°-13°C. Bay area, where salinities as low as 33 parts per thou- sand were recorded, but these species were absent from the brackish water in Rio San Miguel Lagoon. Cyther- Behavior under ecologic stress ellids were not reported in the extensive collections in Cylherella and Cylherelloidea are crawling and burrowing San Antonio Bay (Swain, 1955), where the salinity did forms that are unable to swim. A few specimens collected not exceed 14 parts per thousand, or in collections from at Bimini were observed in the laboratory under various the Solomons Island, Maryland, region, where salinities conditions of salinity, temperature and pH (table 2). did not exceed 20 parts per thousand (Tressler and Although the observations in table 2 are insufficient Smith, 1948).
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