Chemoreception in
            <i>Nassarius obsoletus</i>
            : The Role of Specific Stimulatory Proteins

Gurin, Samuel; Carr, William E. S.

doi:10.1126/science.174.4006.293

Cited by 39 publications

(15 citation statements)

References 13 publications

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“…The preference of H. physis for sand with cirratulids could be explained by the fact that these polychaete worms are among the preferred prey of this species (Rudman, 1972). Thompson (1958) and Gurin & Carr (1971) suggested that opisthobranch larvae select substrata by means of sensitive chemoreception, which could explain how H. physis may detect the substratum offering the best food source. Similarly, Gibson & Chia (1989) showed that the cephalaspidea Haminoea callidegenita were positively induced to metamorphose by substrates on which juveniles and adults were found.…”

Section: Settlement Preferencesmentioning

confidence: 97%

Factors regulating the breeding and foraging activity of a tropical opisthobranch

Hamel

Mercier

2006

Hydrobiologia

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This study investigated the influence of environmental factors on the foraging cycle, breeding activity, settlement and growth of the opisthobranch Hydatina physis using laboratory trials and field observations. Results showed that H. physis follows a nocturnal circadian rhythm mediated by photic intensity and modulated by food availability. The adults foraged between 1900 and 0530 h, with an activity peak between 2000 and 2200 h, and remained inactive and burrowed in the sand during the day. This pattern was clearly influenced by cloud cover, rain and laboratory manipulated light:dark cycle. The reproduction of H. physis was primarily influenced by the lunar cycle. For 4 consecutive months, hermaphroditic reciprocal copulation, preceded by pre-copulatory courtship behaviour, occurred at night 5-7 d before the full moon. Spawning occurred 3-5 d later for up to 5 consecutive nights, the egg mass gradually decreasing in size with each spawning. An overcast sky or rain prevented or delayed both copulation and egg release. Settlement of veligers was largely influenced by the nature of the substrate. In multiple-choice experiments, settlement occurred predominantly on sand containing cirratulid polychaetes. The juveniles reached ca. 3.9 mm in shell length after 5.5 months growth.

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Section: Settlement Preferencesmentioning

confidence: 97%

Factors regulating the breeding and foraging activity of a tropical opisthobranch

Hamel

Mercier

2006

Hydrobiologia

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“…NADPHd staining in larval and juvenile Ilyanassa revealed no evidence of glomeruli or other internal organization in any ganglionic neuropils, not even in the apical, cerebral or osphradial ganglia, which are the ones most likely to participate in any olfactory processing. Larval and juvenile Ilyanassa probably respond to a relatively small number of odorants as compared to the strongly chemoreceptive adults (Carr, 1967a,b;Gurin and Carr, 1971;Atema and Burd, 1975;Hurd, 1985) and so may have experienced little selection pressure for the evolution of complex modular organization within their neuropils. An understanding of internal neuropilar organization within Ilyanassa larvae and juveniles awaits further neuroanatomical studies.…”

Section: Discussionmentioning

confidence: 99%

NADPH-Diaphorase activity changes during gangliogenesis and metamorphosis in the gastropod molluscIlyanassa obsoleta

Lin

Leise

1996

J. Comp. Neurol.

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Gaseous nitric oxide (NO) is produced through the action of the enzyme nitric oxide synthase (NOS) and acts as a neurotransmitter (Jacklet and Gruhn, 1994b;Elphick et al., 1995a;Jacklet, 1995) in the nervous systems of adult gastropod molluscs. By comparison, little or no information appears to exist about the ontogeny of molluscan NOS-containing neurons. NADPH-diaphorase (NADPHd) has been determined biochemically and histochemically to colocalize with NOS immunoreactivity in neurons; NOS is an isoform of NADPHd (Dawson et al., 1991;Hope et al., 1991). We used NADPHd histochemistry to map the distribution of NOS activity in the nervous systems of larvae, including metamorphosing individuals, and juveniles of the marine snail Ilyanassa obsoleta. Several ganglionic neuropils displayed reaction product throughout development. The most intense NADPHd staining occurred in the neuropil of the apical ganglion, a specialized larval structure. Intermediate staining levels occurred in neuropils of the cerebral, pedal, and pleural ganglia. Larval buccal and intestinal ganglia showed little reaction product, with slight increases arising in metamorphically competent larvae. NADPHd activity conspicuously decreased in the central nervous systems of metamorphosing larvae. The osphradial ganglion, which was present in young larvae, showed only weak NADPHd activity. Our results provide evidence for the existence of a nitrergic signalling system in molluscan larvae and juveniles.

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“…Such carrion can be quickly located (chemoreception) by many gastropods (Kohn, 1961). Even extremely low concentrations of a certain glycoprotein from oyster fluid (10-l0 molar) induced a 50 % positive response in N. obsoletus (Gurrin and Carr, 1971). Although their locomotory speed is low (ca.…”

Section: Change Of Dietmentioning

confidence: 99%

Population Dynamics of Nassarius reticulatus (Gastropoda, Prosobranchia) in Gullmar Fjord, Sweden

Tallmark¹

1980

Mar. Ecol. Prog. Ser.

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The population dynamics of Nassarius reticulatus (L.) (Gastropoda, Prosobranchia) was investigated in Gullmar Fjord on the Swedish west coast from 1973 to 1979. A fairly well-defined population on a shallow, sandy bottom in Kvarnbukten Bay (36 000 m*) was intensively studied. Settling of veliger larvae was very irregular and normally only took place where the organic content of the substrate was fairly high, i. e. in deeper water. The snails, especially small ones ( S 15 mm), were greatly attracted to detritus-rich substrates, whereas larger ones congregated on canion. The snails in Kvarnbukten Bay spent their first 3 years in the settling area living mainly on detritus. The change in diet may be a factor influencing the intraspecific competition between small and large snails. When nearly 4 years old (ca. 15 mm) they become sexually mature. From then on most of them participated in the yearly migrations: in April and May from winter quarters in deeper water (1-5 m depth) to the shallow part of the bay (0-1 m) where they spent the summer, and then back again in September to December. Growth rate was fast during the first 3 years with a length increment of about 5.5 mm year-', but then decreased considerably, also becoming individually very variable. Maximum age was about 15 years. Fecundity was high: ca. 6000 eggs female-' year-'; females spawned every year. Mortality rate during the planktonic phase was high but there were few predators on larger snails, parasitism in shallow water probably being the most important cause of losses at this age. Temperature was one of the main proximate factors affecting locomotory activity, migration, spawning and growth. Threshold temperatures for various activities were narrowly defined. Irregular settling of larvae and hence sporadic recruitment to the shallow parts of the bays seemed to be the main reason for population fluctuations in different bays. Advantages of inshore migration (temperature and availability of food) seemed to balance disadvantages (mainly parasitism) and this may explain the dimorphism in migratory habits. As a whole these snails show several special adaptations to the varying environment in this non-tidal, soft bottom littoral.

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Chemoreception in Nassarius obsoletus : The Role of Specific Stimulatory Proteins

Cited by 39 publications

References 13 publications

Factors regulating the breeding and foraging activity of a tropical opisthobranch

Factors regulating the breeding and foraging activity of a tropical opisthobranch

NADPH-Diaphorase activity changes during gangliogenesis and metamorphosis in the gastropod molluscIlyanassa obsoleta

Population Dynamics of Nassarius reticulatus (Gastropoda, Prosobranchia) in Gullmar Fjord, Sweden

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