Reproductive Ecology and Body Burden of Resident ... - The Love Lab

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Table 1. Details of Pacific sanddab, Citharichthys sordidus, collections made between 11 and 20 September 2005 in the Santa Barbara Channel. Site Date Depth (m) Location n TL (cm) ±SD Platform B 11 Sept. 61 m Rincon 16 Sept. 87 m Platform Gilda 20 Sept. 64 m Santa Cruz I. 20 Sept. 64 m 34°19’56” 119°37’18 34°15’21” 119·33’14” 34°10’56” 119°25’09” 34°01’48” 119°30’22” 18 16.1±1.6 19 19.3±4.8 20 20.8±2.6 21 20.7±3.4 Pt. Arguello Pt. Conception Santa Barbara Santa Barbara Channel B X X Rincon Gilda X Ventura San Miguel Island Santa Rosa Island X Santa Cruz Santa Cruz Island Anacapa Island C A L I F O R N I A Area Detailed Figure 1. The location of the four Pacific sanddab sampling sites (latitudes and longitudes listed in Table 1). 73
Results Within Pacific sanddab ovaries, we observed (1) hydrated eggs, (2) smaller eggs with yolks that would later grow and hydrate prior to spawning, (3) postovulatory follicles, (4) minor atresia, and (5) pronounced atresia (Figures. 2A-C, Table 2). Egg hydration (Figure 2A) occurs just prior to spawning, when a mature oocyte expands to as much as four times its original volume (Wallace and Selman, 1981). Between 100% (Platform Gilda) and 50% (Rincon) of fish at each site contained hydrated eggs (Table 2). Smaller yolked eggs were found in between 100% (Platform Gilda) and 55% (Rincon) of fish (Table 2). Postovulatory follicles (Figure 2B) are remnants of the granulosa layer of the previously spawned egg that hypertrophies after the oocyte is released and thus their presence demonstrates that a female has spawned earlier in the season. Older postovulatory follicles (> 24 hours) can be distinguished from “fresh” ones by deterioration of original shape and loss of organization. The presence of postovulatory follicles from a recent spawning alongside maturing follicles destined for a subsequent spawning (Figure 2B) indicates Pacific sanddab spawn more than once during a reproductive season. Postovulatory follicles were found in between 65% (Santa Cruz Island) and 5% (Rincon) of fish (Table 2). At least some fish with minor atresia (Figure 2C) were noted at all of the sites, with levels ranging from 60% (Platform Gilda) to 15% at Santa Cruz Island. Pronounced atresia was relatively rare. No fish at Platform Gilda and Santa Cruz Island were identified as having pronounced atresia, while 6% of the sanddabs at Platform B and 16% at Rincon exhibited this condition (Table 2). Table 2. Histological analyses of Pacific sanddab ovaries from four sites in the Santa Barbara. Values in each column are in percentages. Site n Hydrated Eggs Yolk in Smaller Modes Post-ovulatory Follicles Minor Atresia Pronounced Atresia B 18 95 95 61 22 6 Rincon 19 50 55 5 35 16 Gilda 20 100 100 35 60 0 SCI 21 85 85 65 15 0 74
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Pacific Outer Continental Shelf Reg
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Disclaimer This report had been rev
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TECHNICAL SUMMARY Study Title: Repr
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interactions between total length (
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REPRODUCTIVE ECOLOGY AND BODY BURDE
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tometry. The determination of selen
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Task 3: A Histological Examination
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Task 1: Whole-body Concentrations o
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Study Area and Methods The study ar
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Sample Collection Fish species cons
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to confirm the calibration status o
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variation in elemental concentratio
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Table 2. Summary of fish vital stat
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Table 3. Variation in total length,
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Cadmium. Cadmium concentrations in
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Iron. Iron concentrations in the th
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Nickel. None of the three fish spec
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Strontium. None of the three fish s
Page 38 and 39: Vanadium. Kelp bass and kelp rockfi
Page 40 and 41: came from an oil platform (PL4, 3 o
Page 42 and 43: Table 4. Comparisons of selected tr
Page 44 and 45: Literature Cited Allen, M.J., D.W.
Page 46 and 47: May, T.W., J.F. Fairchild, J.D. Pet
Page 48 and 49: Task 2: Otolith Elemental Signature
Page 50 and 51: sider the ecology of species of int
Page 52 and 53: Table 1. Characteristics of the 18
Page 54 and 55: an undetectable amount of an isotop
Page 56 and 57: Table 2. Two-way ANOVA comparing tr
Page 58 and 59: G 5.0 Kelp rockfish H 20 Platform N
Page 60 and 61: Table 4A. Correlations of predictor
Page 62 and 63: CDA generated a model discriminatin
Page 64 and 65: Pacific sanddab otolith elemental s
Page 66 and 67: A 0.034 Pacific Sanddab B 0.10 Plat
Page 68 and 69: Table 7. One-way ANOVA comparing tr
Page 70 and 71: Table 9A. Correlations of six predi
Page 72 and 73: Kelp rockfish Otolith (element/Ca (
Page 74 and 75: Discussion Results from univariate
Page 76 and 77: of non-drilling associated discharg
Page 78 and 79: ture and salinity on otolith elemen
Page 80 and 81: Miller, J. A and A. L. Shanks. 2004
Page 82 and 83: Appendix 2. Seawater element-to-cal
Page 84 and 85: Appendix 3. Seawater element-to-cal
Page 86 and 87: Task 3: A Histological Examination
Page 90 and 91: Figure 2. A) Ovary of Pacific sandd
Page 92 and 93: Literature Cited Allen, M. J. 1982.
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