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Effects of temperature on sperm swimming behaviour, respiration and fertilization success in the serpulid polychaete, Galeolaria caespitosa (Annelida : Serpulidae)

Journal article
Authors E. K. Kupriyanova
Jonathan N. Havenhand
Published in Invertebrate Reproduction & Development
Volume 48
Issue 1-3
Pages 7-17
ISSN 0792-4259
Publication year 2005
Published at Department of Marine Ecology, Tjärnö Marine Biological Laboratory
Department of Marine Ecology
Pages 7-17
Language en
Keywords Galeolaria caespitosa, temperature, viscosity, sperm swimming velocity, sperm longevity, sperm respiration rates, fertilization success, SEA-URCHIN SPERMATOZOA, WATER TEMPERATURE, MARINE-INVERTEBRATES, CIONA-INTESTINALIS, ENERGY-METABOLISM, VISCOSITY, MOTILITY, LARVAE, ACTIVATION, VELOCITY
Subject categories Ecology

Abstract

This study examines effects of water temperature on sperm swimming velocity, longevity, respiration, and fertilization success in the free-spawning serpulid polychaete Galeolaria caespitosa. Temperature is expected to influence metabolic rates (and swimming speeds) of sperm, and may affect sperm swimming through the mechanical effects of changing water viscosity. To separate the physiological and mechanical effects of water temperature, viscosity and temperature were manipulated independently. Changes in water temperature significantly influenced fertilization success and duration of sperm activity. In the range 11-31 degrees C peak fertilization rates (> 80%) were observed at 21 degrees C, the typical summer water temperature in the native habitat. Both lower and higher temperatures resulted in significantly lowered fertilization rates. Longevity experiments demonstrated a trade-off between sperm velocity and duration of activity: at 2 VC high sperm velocity declined sharply within 4 h, reaching zero within 8 h, at 11 degrees C sperm maintained reduced velocity for over 12 h. Thus, temperature influenced sperm longevity and fertilization success by directly affecting sperm swimming velocity. Both physiological and viscosity-induced components of temperature were shown to affect sperm swimming velocity and corresponding fertilization success in G. caespitosa. Lower water temperature also resulted in significantly lower respiration rates of G. caespitosa sperm. However, viscosity alone did not significantly affect sperm respiration, suggesting that sperm may not be capable of compensating for velocity changes due to increased viscosity. Studies examining sperm metabolism and physiological compensation are needed to understand how broadcasting organisms achieve high fertilization rates in a wide range of ambient temperatures.

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