. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LEECH-MYSID SHRIMP INTERACTION 100- 90- 80- 70- 60- 50- 40- 30- 20- 10-. TemperaIure(°CI 5 10152CT2225 5 1015202225 5'lo'l5'20122l25l ' 5110I15I20I22I25I ' 5'10I15I20122I251 Salinity (°/oo) 0 10 15 20 30 FIGURE 3. Mean values for the survival of adult Mysidobdella borealis in 30 combinations of temperature and salinity after 10 days exposure. 4 weeks at 20°C and in about 14 weeks at 7°C. We did not collect cocoons in the wild. Juvenile leeches ( mm) usually attached themselves to TV. americana within hours of emerging
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LEECH-MYSID SHRIMP INTERACTION 100- 90- 80- 70- 60- 50- 40- 30- 20- 10-. TemperaIure(°CI 5 10152CT2225 5 1015202225 5'lo'l5'20122l25l ' 5110I15I20I22I25I ' 5'10I15I20122I251 Salinity (°/oo) 0 10 15 20 30 FIGURE 3. Mean values for the survival of adult Mysidobdella borealis in 30 combinations of temperature and salinity after 10 days exposure. 4 weeks at 20°C and in about 14 weeks at 7°C. We did not collect cocoons in the wild. Juvenile leeches ( mm) usually attached themselves to TV. americana within hours of emerging from cocoons. No young attached leeches survived more than 8 days at 20°C, but some juveniles remained attached to refrigerated mysids (7°C) for almost 6 months. These leeches were mm in length when the experiment ended in late November. Laboratory experiments indicated that M. borealis was intolerant of low salin- ities and high temperatures (Fig. 3). All leeches died in test salinities of 0 and 10%o at all temperatures, and at 25°C at any salinity. Leeches survived best in combi- nations of high salinity and low temperature; M. borealis maintained below 10°C and at 30%o in the laboratory usually survived for months. DISCUSSION The marine leech, M. borealis, suddenly occurred in sled collections in the salt marsh embayment at Hereford Inlet, New Jersey, each winter and persisted until early summer. The mysid host, TV. americana, was ubiquitous in the major water- ways throughout the year, but leeches were not associated with warm-water mysid populations. In New Hampshire, M. borealis was found only from December through March even though mysids were present all year (Burreson and Allen, 1978). Similar distributions of the leech and mysid were found in Barnegat Bay, New Jersey, where M. borealis occurred in 65 out of 307 samples from November 1975 to June 1976, but did not occur in any of the 224 collections taken from July through October (Sandine et al., 1977
Size: 1240px × 2014px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
