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- Gunton, L. M., et al.
(författare)
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Annelids of the eastern Australian abyss collected by the 2017 RV 'Investigator' voyage
- 2021
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Ingår i: Zookeys. - : Pensoft Publishers. - 1313-2989 .- 1313-2970. ; :1020, s. 1-198
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Tidskriftsartikel (refereegranskat)abstract
- In Australia, the deep-water (bathyal and abyssal) benthic invertebrate fauna is poorly known in comparison with that of shallow (subtidal and shelf) habitats. Benthic fauna from the deep eastern Australian margin was sampled systematically for the first time during 2017 RV 'Investigator' voyage 'Sampling the Abyss'. Box core, Brenke sledge, and beam trawl samples were collected at one-degree intervals from Tasmania, 42 degrees S, to southern Queensland, 24 degrees S, from 900 to 4800 m depth. Annelids collected were identified by taxonomic experts on individual families around the world. A complete list of all identified species is presented, accompanied with brief morphological diagnoses, taxonomic remarks, and colour images. A total of more than 6000 annelid specimens consisting of 50 families (47 Polychaeta, one Echiura, two Sipuncula) and 214 species were recovered. Twenty-seven species were given valid names, 45 were assigned the qualifier cf., 87 the qualifier sp., and 55 species were considered new to science. Geographical ranges of 16 morphospecies extended along the eastern Australian margin to the Great Australian Bight, South Australia; however, these ranges need to be confirmed with genetic data. This work providing critical baseline biodiversity data on an important group of benthic invertebrates from a virtually unknown region of the world's ocean will act as a springboard for future taxonomic and biogeographic studies in the area.
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- Kupriyanova, E. K., et al.
(författare)
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Effects of temperature on sperm swimming behaviour, respiration and fertilization success in the serpulid polychaete, Galeolaria caespitosa (Annelida : Serpulidae)
- 2005
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Ingår i: Invertebrate Reproduction & Development. - : Informa UK Limited. - 0792-4259 .- 2157-0272. ; 48:1-3, s. 7-17
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Tidskriftsartikel (refereegranskat)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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