Reproduction and sexual maturation of the scavenging deepwater isopod<i>Natatolana borealis</i>(Lilljeborg) from western Norway

Johansen, Per-Otto

doi:10.1080/00364827.1996.10413627

Cited by 9 publications

(19 citation statements)

References 16 publications

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“…They must probably reach these food sources as quickly as possible to compete with other scavengers, such as amphipods, gastropods, or polychaetes. These isopods were attracted significantly more often to baited than to non‐baited traps (Wong and Moore 1996), but breeding females, which have one or two broods during their lifetime, were not caught in the traps (Johansen 1996; Wong and Moore 1996). The tactic of N. borealis can be regarded as ‘sit‐and‐wait’ (Wong and Moore 1996); if food is available, however, this species shows a rapid response which is also found in several scavenging abyssal amphipods from the North‐East Atlantic Ocean (Thurston 1979).…”

Section: Discussionmentioning

confidence: 99%

Microscopic anatomy and ultrastructure of the digestive system of Natatolana obtusata (Vanhöffen, 1914) (Crustacea, Isopoda)

2002

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The scavenging cirolanid isopod Natatolana obtusata was caught using primarily meat‐baited traps at a station in the Weddell Sea at Kap Norvegica. The hindguts of most specimens were densely stuffed with meat from the traps. The anatomy and the ultrastructure of different sections of the digestive system are described. The large and extremely expandable mouth opens into a short oesophagus which extends posteriorly into a small stomach. Lateralia and primary filter can be observed directly when the mouth opening is widened to its extreme. The anterior hindgut is extremely variable in its lumen and very distensible, depending on the nutritional condition. The cuticle of the hindgut is colonized by fungi. The length of the midgut glands varies with the nutritional conditions. Morphology and anatomy of the digestive system of Natatolana obtusata are discussed with the background of the lifestyle of the species and compared with other taxa.

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Section: Discussionmentioning

confidence: 99%

Microscopic anatomy and ultrastructure of the digestive system of Natatolana obtusata (Vanhöffen, 1914) (Crustacea, Isopoda)

2002

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“…Large N. rossi have been maintained in laboratory conditions at 15°C without food for between 2 and 3 months. Although this period appears lengthy compared with amphipods [23-30 days (Sainte-Marie et al, 1989;Moore and Wong, 1995)], it may be usual for cirolanids, especially females which appear unlikely to feed for several months when carrying eggs within the marsupium (Johansen, 1996).…”

Section: Discussionmentioning

confidence: 99%

Feeding, Respiration, and Aerial Exposure in a Scavenging Cirolanid Isopod From New Zealand

Marsden¹

1999

Journal of Crustacean Biology

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The feeding rate, oxygen consumption, and effects of aerial exposure were measured for a cirolanid isopod, Natatolana rossi, collected from a shallow subtidal habitat at Kaikoura, New Zealand. The isopod survived 7 days exposure in water-saturated air at 15Â°C and mean survival time was similar both in water-saturated air (5.1 days) and water (4.6 days) at 1Â°C.Weight loss in aerial conditions increased both with time and with decreasing relative humidity (RH). Weight-specific transpiration rates (mg water loss h-1 mg-1 wet wt) were 0.057 for 60% RH and 0.017 at 80% RH. Lethal water loss was approximately 30% of the initial wet weight. Weightspecific rates of resting oxygen consumption for N. rossi were low compared with other aquatic peracarids (0.26 Î¼l O2 mg-1 h-1) at the habitat temperature of 10Â°C. Oxygen uptake increased with exposure temperatures between 5 and 25Â°C. Following aerial exposure, oxygen uptake was significantly reduced to 50% of the aquatic rate and was temperature-independent.Feeding experiments using blue moki fish (Latridopsis ciliaris) showed that N. rossi is unable to feed in air and that food intake in aquatic conditions increased with exposure temperature. Highest food consumption was measured at 15Â°C, where the rate represented 30% of the dry body weight per day.This study suggests that N. rossi is a "sit and wait, batch reactor" predator/scavenger. It displays a low resting metabolism and is capable of long periods of fasting. It maximizes food intake with a high feeding rate on an energy-rich food source. In addition, its ability to survive aerial exposure would allow it to survive and minimize energy expenditure if inadvertently displaced into intertidal habitats.The Isopoda is a diverse crustacean group, members of which have exploited a range of marine, fresh-water, and terrestrial habitats. They are predominantly opportunistic omnivores with some members specializing in carnivory, scavenging, or parasitism (Schram, 1986). In contrast with other isopods, cirolanid isopods are specialized macrophagous feeders which can be predators on fish, polychaetes, and amphipods as well as carrion feeders. Commonly known as sea-lice, these isopods are reported to cause extensive damage to fishes caught in nets and long lines (Hale, 1927;Bruce, 1986).Recently, there have been a number of studies on the population biology, reproduction, and physiology of the cirolanid Natatolana borealis Lilljeborg from deep-water habitats. However, there are no comparative data on the energetics and metabolism of shallow-water species. The present study is part of a larger investigation into the ecophysiology of cirolanids from New Zealand and concentrates on Natatolana rossi (Miers), which is frequently found in nets and baited traps. I investigated the effects of aerial exposure on feeding and respiration of N. rossi, including the effects of temperature on oxygen uptake. For the feeding studies, isopods were provided with blue moki, a commercial fish thought to be especially susceptible to damage...

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“…There is little information on the ecology of the Australian Natatolana species and most published work is on N. borealis, a deep sea species occurring in the northern hemisphere (Bird, 1981;Moore and Wong, 1995;Taylor and Moore, 1995;Wong and Moore, 1995;Johansen, 1996). It has been reported that these isopods burrow in the sediment during the day, emerging primarily at dusk to feed, and return to the sediment before dawn (Stepien and Brusca, 1985).…”

Section: Fate Of Discards: Cafeteria Experimentsmentioning

confidence: 99%

Fate and consumption of discarded by-catch in the Spencer Gulf prawn fishery, South Australia

2008

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Reproduction and sexual maturation of the scavenging deepwater isopodNatatolana borealis(Lilljeborg) from western Norway

Cited by 9 publications

References 16 publications

Microscopic anatomy and ultrastructure of the digestive system of Natatolana obtusata (Vanhöffen, 1914) (Crustacea, Isopoda)

Microscopic anatomy and ultrastructure of the digestive system of Natatolana obtusata (Vanhöffen, 1914) (Crustacea, Isopoda)

Feeding, Respiration, and Aerial Exposure in a Scavenging Cirolanid Isopod From New Zealand

Fate and consumption of discarded by-catch in the Spencer Gulf prawn fishery, South Australia

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