Effects of temperature, nutritive and metal stressors on the reproductive biology of Mytilus edulis

Industrial depuration may provide a means of removing domoic acid toxin from blue mussels (Mytilus edulis). Mussels containing up to 50 μg domoic acid∙g−1 were transported from a Prince Edward Island estuary into controlled laboratory conditions to test the effects of temperature, salinity, mussel size, and feeding upon depuration. Fifty percent of toxin was eliminated within 24 h. After 72 h, mussels were either clean or contained, on average, only residual levels of toxin (< 5 μg∙g−1), regardless of conditions. Exponential depuration curves were fitted to the domoic acid concentration data. To evaluate differences in rate of depuration under various conditions, statistical comparisons were made between slopes of the clearance curves. Rates of depuration were faster in small (45–55 mm) than in large mussels (60–70 mm) and more rapid at 11 than at 6 °C. There was no significant difference in depuration rate at 18‰ salinity as opposed to 28‰ or in starved versus fed mussels. Because of their relatively large digestive glands, meats of small mussels contained more toxin per unit weight than meats of large mussels. The bulk of domoic acid appeared to reside in the gut lumen. However, the presence of small amounts of domoic acid in intracellular compartments cannot be ruled out.

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Effects of Temperature and Photoperiod on the Reproductive Biology and Diapause ofOobius agrili(Hymenoptera: Encyrtidae), an Egg Parasitoid of Emerald Ash Borer (Coleoptera: Buprestidae)

Environmental Entomology ◽

10.1093/ee/nvw034 ◽

2016 ◽

Vol 45 (3) ◽

pp. 726-731 ◽

Cited By ~ 6

Author(s):

J. Hoban ◽

J. J. Duan ◽

J. Hough-Goldstein

Keyword(s):

Reproductive Biology ◽

Emerald Ash Borer ◽

Egg Parasitoid ◽

Effects Of Temperature

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Patterns of reproduction in two co-occurring Great Barrier Reef sponges

Marine and Freshwater Research ◽

10.1071/mf16272 ◽

2017 ◽

Vol 68 (7) ◽

pp. 1233 ◽

Cited By ~ 6

Author(s):

Muhammad Azmi Abdul Wahab ◽

Rocky de Nys ◽

Ross Holzman ◽

Caroline Luise Schneider ◽

Steve Whalan

Keyword(s):

Great Barrier Reef ◽

Reproductive Biology ◽

Histological Analysis ◽

Biological Process ◽

Sponge Species ◽

Simultaneous Hermaphrodite ◽

Barrier Reef ◽

Sperm Release ◽

Effects Of Temperature

Reproduction is a key biological process that underpins the persistence and maintenance of populations. However, information on the reproductive biology of Great Barrier Reef (GBR) sponges is depauperate. The present study established the reproductive biology of two co-occurring GBR sponges, namely Ianthella basta (Verongida) and Ircinia sp. (Dictyoceratida). Sponges were haphazardly sampled (monthly) over a period of 1 year. Histological analysis of samples established the sexuality, development, seasonality, gametogenesis and fecundity of the two species, as well as the effects of temperature on reproduction. I. basta is oviparous, whereas Ircinia sp. is viviparous. The mode of sexuality in I. basta could not be determined, because male propagules were not detected, whereas Ircinia sp. is a simultaneous hermaphrodite. Reproduction in I. basta is unique within the verongids and co-occurring oviparous species, with peak reproduction occurring at the minimum annual temperature (23°C) and spawning occurring as the temperature increased above 23.4°C. Reproduction in Ircinia sp. corresponded to patterns reported for other viviparous GBR species, with an increase in reproductive propagules, peak sperm release, fertilisation and spawning occurring at temperatures above 25°C. Fecundity in I. basta and Ircinia sp. is high compared with other sponge species in the region, which may contribute to their apparent abundance on the GBR.

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Biochemical Effects of Temperature and Nutritive Stress on Mytilus Edulis L.

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315400022268 ◽

1973 ◽

Vol 53 (2) ◽

pp. 269-286 ◽

Cited By ~ 201

Author(s):

P. A. Gabbott ◽

B. L. Bayne

Keyword(s):

Mytilus Edulis ◽

Condition Index ◽

Early Summer ◽

The Body ◽

Ostrea Edulis ◽

Rapid Loss ◽

Biochemical Effects ◽

Spring Period ◽

Body Tissues ◽

Effects Of Temperature

In a previous paper Bayne & Thompson (1970) showed that temperature and nutritive stress resulted in a decline in body condition of mussels, Mytilus edulis, when kept in the laboratory. Both carbohydrate and protein were lost from the body tissues but the losses (as a percentage of the initial values) were greater from the germinal (mantle) than from the somatic (non-mantle) tissues. In spite of the loss of body reserves, M. edulis was able to continue maturation of the gonad during the autumn to spring period. In the early summer, however, when the gametes were fully ripe, stress resulted in a recession of the gonad and a rapid loss of protein from the mantle tissues. A similar decline in condition index and loss of glycogen and protein has been reported for adult oysters, Ostrea edulis, when maintained under hatchery conditions (Gabbott & Walker, 1971).

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