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A 1 5-Month Field Study Was Made on the Reproductive Cycles Of AN ABSTRACT OF THE THESIS OF Donald Keith Seavy for the degree of Doctor of Philosophy in Zoology presented on April 28, 1977 Title: SEASONAL GAMETOGENESIS AND EGG LAYING IN THE PROSOBRANCH GASTROPODS NUCELLA LAMELLOSA, NUCELLA EMARGINATA, SEARLESIA DIRA AND AMPHISSA COLUMBIANA ON 'H OREGON COAST Abstract approved: Signature redacted for privacy. 3. Gonor A 1 5-month field study was made on the reproductive cycles of the prosobranch gastropodsNucella lamellosa, Nucella emarginata, Searlesia dira and Amphissa columbiana on the Oregon coast. Amphissa columbiaria and Seárlesia dira were collected from Boiler Bay, Nucella emarginata from Seal Rock and Nucella lamellosa from inside Yaquina Bay. All of these species are carnivores and produce relatively few large eggs which are deposited in capsules.Each species produces a non-pelagic crawling larva whose developmental time is highly temperature dependent. The seasonal gametogenic process in females was studied by measuring oocytes in histological sections.Since these oocytes are elliptical in cross section due to packing in the ovary, the long and short axis of each oocyte was measured and converted to the diameter of a circle of equivalent area. The time required to produce an egg is approximately 20 months in Nucella lamellosa, 16 months in Searlesia dira and Amphissa columbiana and 14 months in Nucella emarginata.Daily relative growth rates for oocytes are initially low in all four species, approxi- mately 1. 6% per day, increasing two or three months prior to spawn- ing to 5. 6% in Nucella emarginata, 4. 9% in Searlesia dira and 5.4% in Amphissa columbiana, but only 2. 0% in Nucella lamellosa.Pre- vitellogeriic oocytes begin to appear when middle-sized oocytes begin to grow rapidly to larger sizes.This rapid increase in oocyte growth rates begins in July for Amphissa columbiana and Searlesia dira and in September for Nucella emarginata and Nucella lamellosa. In males of all four species spermatogenesis continues through- out the year except for a brief period immediately after spawning. Spermatogenesis is not well correlated with environmental tempera- ture or salinity changes, but the percentage of sperm in tubules of the testis does decrease during the spawning season. Amphissa columbiana, Searlesia dira and Nucella emarginata begin spawning in October and November at the time coastal upwelling ceases.Nucella lamellosa, found inside Yaquina Bay, does not begin spawning until June, well past the period of extremely low salinities of December and January. The oogeriic cycles of Nucella lamellosa, Searlesia dira and Amphissa columbiana are adapted to maximize fecundity through the use of a restricted breeding season and a fixed-sized juvenile emerg- ing at the time of the year when food availability for juveniles is at a maximum.Fecundity is maximized by Nucella emarginata in re- sponse to an increased food supply by repeated spawnings over a long period of time.Juvenile size at hatching varies in this species due to a constant number of food eggs and a variable number of embryos placed in each capsule. Seasonal Gametogenesis and Egg Laying in the Prosobranch Gastr opods. Nucella lamellosa, Nucella emarginata, Searlesia dira and Amphissa columbiana on the Oregon Co3st by Donald Keith Seavy A THESIS submitted to Oregon State University in partial fulfillment of the requirements for the degree of Doctor of Philosophy Completed April 28, 1977 Commencement June 1977 ACKNOWLEPGMENTS I gratefully acknowledge the many stimulating discussions, advice and encouragement of my major professor, Dr. Jefferson J. Gonor, during all phases of my resecli program. The manuscript has been considerably improved by the com- ments and constructive criticism of Drs. James McCauley, Victor Neal, Robert E. Olson and John A. Wiens. Several people have helped with the final preparation of the dissertation: Kris Molesworth is due credit for the maps, histo- grams and graphs, Wes Loder rendered histological slides to photo- graphic plates, and my wife Mary devoted uncounted hours to whatever needed to be done during the course of this study. Without these people and many others this dissertation would not exist.To all of you I say thank you. TABLE OF CONTENTS INTRODUCTION 1 Purpose of this Study 1 Definition of Reproductive Cycle 7 Methods of Determining Reproductive Cycles 8 Types of Reproductive Cycles 9 Control of the Timing of the Events inR.eprodpctive Cycles 15 The Effect of Temperature 16 The Effect of Salinity 18 The Effect of Photoperiod 19 The Effect of Nutrition 20 The Strategy of Egg Numbers and Egg Size 22 MATERIALS AND METHODS 27 Description of Study Areas 27 Histology 31 Measurement of Gametes 32 Controlled Temperature Experiments 35 Field Observations 35 Statistical Treatment of Data 36 RESULTS 38 Environmental Temperatures and Salinities 38 Nucella lamellosa 48 Field Observations 48 Oogenesis 51 Determination of the Reproductive Cycle from Egg Diameter Data 52 Egg Capsules and Young 62 Spermatogenesis 63 Nucella emarginata 68 Field Observations 68 Oogenesis 71 Determination of the Reproductive Cycle from Egg Diameter Data 73 Egg Capsules and Young 80 Spermatogenesis 81 Searlesia dira 82 Field Observations 82 Oogenesis 85 Determination of the Reproductive Cycle from Egg Diameter Data 87 Egg Capsules and Young 94 Amphissa columbiana 96 Field Observations 96 Oogenesis 96 Determination of the Reproductive Cycle from Egg Diameter Data 100 Egg Capsules and Young 105 Spermatogenesis 106 Statistical Summary 106 Comparison of the Reproductive Cycles in Nucella lamellosa, Nucella emarginata, Searlesia dira and Amphissa columbiana 116 Comparison of Oocyte Growth Curves for Nucella lamellosa, Nucella emarginata, Searlesia dira and Amphissa columbiana 124 Constant Temperature Experiments 1 24 Histology of the Gonad and Digestive Gland 128 Interpretation of Experimental Data 133 DISCUSSION 137 Field Observations 137 Seasonal Appearance of Ripe Sperm in Males 142 Determination of Reproductive Cycle from Oocyte Diameter Measurements 143 Statistical Tests 146 Comparison of Oocyte Growth Rates 148 Relationship between Oocyte Growth and Feeding 150 Synchrony of Gametogenesis and Breeding Cycles 1 53 Strategy of Egg Numbers and Egg Size 1 58 SUMMARY AND CONCLUSIONS 162 BIBLIOGRAPHY 165 APPENDIX 176 LIST OF FIGURFS Figure Page The location of Boiler Bay, Yaquina Bay and Seal Rock in relation to the state of Oregon. 28 Yaquina Bay, Oregon with the Coquille Point sampling site. 29 The monthly range and mean of salinity and tempera- ture in Yaquina Bay from May, l97through July, 1971 measured at the intake to the Marine Science Center sea water system.Graphed from the data of Wyatt and Gilbert, 1971, 1972. 39 The monthly range and mean of surface water salinity and temperature measured at the Columbia. River lightship from May, 1970 through July, 1971.Graphed from the data of Wyatt and Gilbert, 1971, 1972. 39 Surface water temperature measured in Yaquina Bay at the Marine Science Center floating dock from May, 1970 through May, 1971.Graph and data from Thum, 1972. 40 Bottom water salinity in Yaquina Bay recorded from the Marine Science Center sea water system at the times of higher high water (HHW) ad lower low water (LLW) from May, 1970 through May, 1971.Graph and data from Thum, 1972. 40 5, Graph of percent tidal exposure with elevation for 1968. 43 Daily temperature range at the 0. 0 m tidal level mea- sured at Whale Cove from August 21, 1970 through August 20, 1971.Data from Gonor, Thum and Elvin, 1970 and Elvin, pers. comm. 45 Daily temperature at the +1.4 m (+4. 5 ft) tidal level measured at Whale Cove from August 20, 1970 through August 21, 1971.Data from Gonor, Thurn. and Elvin, 1970 and Elvin, pers. comm. 47 Figure Page Cross section of an ovary tubule from Nucella .lamellosa showing two pre-vitellogenic primary oocytes sectioned through the nucleus and nucleolus and yolk platelets of two vitellogenic oocytes not sectioned through the nucleus. 53 Range, mean and 95% confidence interval for the oocytes measured in Nucella lamellosa from May, 1970 through July, 1971. 54 Oocyte diameter frequency histograms forNucella lamellosa for the period from May, 1970 through July, 1971. 57 A portion of an ovarian tubule of a spawned Nucella lamellosa showing small primary oocytes attached to the tubule wall. 61 Section of the testis of a recently spawned Nucella lamellosa showing the increased hemoco-elic space between the tubules. 65 Cross section of a tubule from the testis ofa ripe Nucella lamellosa.Hemocoelic space is reduced and sperm are oriented with their tails extending into the lumen of the tubule. 66 Range and mean of sperm in the tubules of the testis of Nucella lamellosa, Nucella erriarinata, Searlesia dira and Amphissa columbiana for the period from May, 1970 through July, 1971. 67 Cross section through the gonad of a female Nucella emarginata infected with a trematode parasite.No oocytes are present in this portion of the gonad. 70 Cross section through the gonad of a female Nucella emarginata showing both a pre-viteLLogenic oocyte and a vitellogenic oocyte sectioned through the nucleolus. 72 Range, mean and 95% confidence interval fothe oocytes measured in Nucella emarginata from May, 1970 through July, 1971. 74 Figure Page Oocyte diameter frequency histograms for Nucella emarginata for the period from May, 1970 through July, 1971. 78 Cross section through a tubule in the testis of a parti- ally spawned Nucella emarginata male. 83 Cross section through the gonad of afemale Searlesia dira showing several stages of viteilogenesis. 86 Cross section through the gonad of a spawned female Searlesia dira.Pre-vitellogenic and vitellogenic oocytes remain attached to the tubule wall.Amoebo- cytes are present in the lumen of the tbule, and the hemocoelic space between the tubules has increased. 88 Range, mean and 95% confidence interval for the oocytes measured in Searlesia dira from May, 1970 through July, 1971. 89 Oocyte diameter frequency histograms for Searlesia dira for the period from May, 1970 through July, 1971.
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