The Autecology of Eudiaptomus cf drieschi (Poppe & Mrazek 1895 ...

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Fig 1 Map of Lake Kinneret -Israel Kinneret Limnological Laboratory F -220 -230 32 o 50 / -240 -250 N o 32 45 / 35 o / 32 5 Km 35 o 35 / 35 o 38 / Figure 2: Map of Lake Kinneret (Seruuya, 1978) showing sampling station F.
2. Methods and Materials 2.1 Seasonal Abundance Studies (Routine Field Sampling) Samples were collected weekly from Station F (fig 1) using a 20 L plexiglass Schindler - Patalas trap. Duplicate water samples from 1, 5, 10, and 20 meters were concentrated through a 20 m mesh sieve net and preserved separately, in 4% sugar (Haney & Hall 1972) formalin (32g sugar / liter formalin). The entire sample was counted at 20x on a Wildco plankton wheel (10 ml vol.) with a Wild binocular dissecting microscope All life stages were identified (NI - VI, CI - V, adult males and females) and counted separately. Egg bearing females were noted separately from adult females without eggs, and the numbers of eggs per female were counted. Samples from fixed depths were counted separately to examine vertical distribution, then the counts were pooled for population dynamics. Diapausing (resting) eggs were distinguished from subitaneous (immediately hatching) eggs (for one season) in preserved samples by adding Lugol’s solution to the samples and examining them under an inverted microscope (Lohner 1990). Sex ratios were compiled using a chi – square test for goodness of fit: X 2 = (f – f^) 2 (1) f^ f is the observed frequency, and f^ the expected (Sokal & Rohlf 1973). 2.2 Benthic Resting Eggs Lake bottom sediments were collected monthly using a standard gravity corer with plexiglas cores (inner diameter: 5.2 mm, length: 47.0 cm.) from the RV Hermona at sampling station F (maximum depth 22 meters). Cores were also taken from random sites around the lake. The cores were removed to the lab and sediments were processed within one hour of collection, or held upright in cold (4 0 C) storage until sliced. The entire core (38.5 cm.) was sectioned into 1 cm. slices. (Investigations showed that viable resting eggs were rarely found at depths below 12 cm. in the sediments. For that reason, subsequent cores were sectioned only to 15 cm. depth.) Sediments were weighed and divided; half for dry weight determination and half for egg counts. Sediment samples for establishing dry weight were put into pre-weighed foil containers and placed in a drying oven (100 o C) for 48 hours. The sediment portions containing the eggs were processed
Page 1 and 2: The Autecology of Eudiaptomus cf dr
Page 3 and 4: Table of Contents Page Abstract Res
Page 5 and 6: Abstract Prior to the mid-eighties,
Page 7 and 8: occupying a niche and using its ada
Page 9 and 10: 1. General Introduction 1.1 Kinnere
Page 11 and 12: Over 30 different zooplankton speci
Page 13 and 14: The National Water Carrier, which w
Page 15: (Baird 1859); Arctodiaptomus (Arcto
Page 19 and 20: (>20 µm) and nano (20 m) and nano
Page 21 and 22: Stock preparations Females with rip
Page 23 and 24: when the population meets condition
Page 25 and 26: 2.4.4. Food Requirements Mature adu
Page 27 and 28: c) b) a) d) e) • Figure 2: a) fem
Page 29 and 30: 23 The female antennules are symmet
Page 31 and 32: 25 Monthly Copepod Biomass 25.0 20.
Page 33 and 34: E. drieschi has a strong seasonal p
Page 35 and 36: Total Number of Organisms, L -1 80
Page 37 and 38: decline of E. drieschi in the water
Page 39 and 40: Average Depth of Individual = x 1 z
Page 41 and 42: Resting Egg Distribution in the Sed
Page 43 and 44: ) c) Figure 14: (a) resting egg fro
Page 45 and 46: 3.6 Development Development Time De
Page 47 and 48: Development Rate Post-embryonic dev
Page 49 and 50: 3.7 Salinity tolerance Survival of
Page 51 and 52: 4. Discussion 4.1 Taxonomical Posit
Page 53 and 54: 4.2 Ecological Implications of Deve
Page 55 and 56: seasonal abundance or intra-specifi
Page 57 and 58: distinguish resting eggs from subit
Page 59 and 60: ability as copepods mature. Diaptom
Page 61 and 62: 4.5.2 Temperature Temperature has b
Page 63 and 64: 4.5.3 Food Calanoid copepods in gen
Page 65 and 66: chloride. Between 1955-69, salinity
Page 67 and 68:
This study offered the rare (and fo
Page 69 and 70:
Beeton, A. M. (1981) General introd
Page 71 and 72:
DeFrenza, J., Kirner, R.J., Maly, E
Page 73 and 74:
Gophen, M. 1977. Food and feeding h
Page 75 and 76:
Hanazato, T. and Yasuno, M. 1989. I
Page 77 and 78:
Kawabata, K. 1989. Natural developm
Page 79 and 80:
Norrbin, M.F. 1994. Seasonal patter
Page 81 and 82:
copepod species in the eastern Wedd
Page 83 and 84:
Implications for diel vertical migr
Page 85 and 86:
האאוטאקולוגיה של (Po
Page 87 and 88:
והוטלו שנה קודם לכך
Page 89:
האאוטאקולוגיה של (Po
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