Recruitment and metamorphosis of Haliotis larvae induced by molecules uniquely available at the surfaces of crustose red algae

Morse, Aileen N. C.; Morse, Daniel E.

doi:10.1016/0022-0981(84)90166-7

Cited by 276 publications

(142 citation statements)

References 37 publications

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“…Coralline algae are of particular ecological importance in shallow waters and the ecosystem services they provide, which include provision of nursery habitat for commercially important invertebrate species, have been recognized (Kamenos et al, 2004). They produce chemicals or harbour specific bacteria that promote larval settlement and recruitment of numerous invertebrates (Morse et al, 1980;Morse & Morse, 1984;Johnson et al, 1991) and their rigid structure provides microhabitats for a high diversity of associated organisms (Cabioch, 1969;Bosence, 1976Bosence, , 1979Foster, 2001). Coralline algae are also of significant importance in the carbon and carbonate cycles of shallow coastal ecosystems, being major contributors to CO 2 fluxes through high community photosynthesis (CO 2 sink) and respiration (CO 2 source) (Martin et al, 2005(Martin et al, , 2006(Martin et al, , 2007 and through high CaCO 3 production (CO 2 source) and dissolution (CO 2 sink) (Barrόn et al, 2006;Martin et al, 2006Martin et al, , 2007.…”

Section: Introductionmentioning

confidence: 99%

Photosynthesis, respiration and calcification in the Mediterranean crustose coralline algaLithophyllum cabiochae(Corallinales, Rhodophyta)

Martin

Charnoz

Gattuso

2013

European Journal of Phycology

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Primary production and calcification responses to irradiance were investigated in Lithophyllum cabiochae, a crustose coralline alga from Mediterranean coralligenous communities, collected at c. 25 m depth in the Bay of Villefranche. Algae were maintained in aquaria at temperature and irradiance levels close to in situ conditions. Physiological measurements were performed using incubation chambers in the dark and in the light at different irradiance levels within the range of those measured in situ. Both photosynthesis and calcification rates in L. cabiochae were strongly related to irradiance. Dark respiration averaged 0.2-0.3 µmol cm −2 thallus h −1 in terms of both O 2 consumption and CO 2 release and maximal gross photosynthesis averaged 1.0 µmol cm −2 h −1 in terms of both O 2 production and CO 2 uptake. Mean rate of net calcification was 0.1 µmol CaCO 3 cm −2 h −1 in the dark and reached 0.4 µmol CaCO 3 cm −2 h −1 in the light. Diel net and gross organic C productions were estimated to be 3 and 7 µmol C cm −2 thallus d −1, respectively. Diel net inorganic C production was estimated to be 3 µmol CaCO 3 cm −2 thallus d −1. Despite the low light conditions experienced by the algae at c. 25 m depth, L. cabiochae can be considered as a major contributor to primary productivity and calcium carbonate deposition, making coralligenous communities a major carbon and carbonate producer in the Mediterranean Sea.

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Section: Introductionmentioning

confidence: 99%

Photosynthesis, respiration and calcification in the Mediterranean crustose coralline algaLithophyllum cabiochae(Corallinales, Rhodophyta)

Martin

Charnoz

Gattuso

2013

European Journal of Phycology

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“…Abalone larvae depend on recognition of external chemical signals from the environment for settlement and metamorphosis (Morse et al, 1979;Morse and Morse, 1984). Substances such as g-amino butyric acid (GABA; Morse, 1990), biotic films derived from seawater or mucus trails of grazing adult are used to induce metamorphosis Toole, 1988;Hahn, 1989).…”

Section: Introductionmentioning

confidence: 99%

Seed production and juvenile rearing of the tropical abalone Haliotis varia Linnaeus 1758

Najmudeen

Victor

2004

Aquaculture

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Spawning, larval and juvenile rearing of the tropical abalone Haliotis varia L. were studied. Brood stock abalone were induced to spawn by exposure to air for 2 h at 27 jC. Female abalone spawned a mean of 76,530 eggs. Fertilised eggs measured 180 Am in diameter. Seventy percent survival was obtained during larval rearing. Larvae passed trochophore, veliger, gliding and creeping stages and were induced to settle on a mat of diatoms containing Nitszchia sp. and Navicula sp. The larval rearing period of H. varia ranged from 4 to 6 days at 27 jC. The settled spat vigorously fed on the diatom mat until the 50th day of postfertilisation and coralline red algal film, until the 70th day of postfertilisation. First respiratory pore was formed on the 27th day of postfertilisation. Juvenile abalones were reared on three algal diets such as coralline red algae, green filamentous algae and Ulva lactuca from the 71st to 200th day of postfertilisation. Those fed with coralline algae showed best and consistent growth. Shell colour of juveniles was affected by diet. The present study on the production of juveniles in the hatchery is a baseline information to initiate abalone aquaculture in India and to help augment the natural population. D

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“…Larvae (0.2 mm) of the Pacific red abalone, Haliotis rufescens, a gastropod mollusc, are induced to settle, attach to substrata, and metamorphose by chemosensory recognition of y-aminobutyric acid (GABA)-mimetic molecules that are uniquely associated with the surfaces of crustose red algae (9,10). These purified natural inducers alone, GABA, and a number of GABA analogs are sufficient to induce this genetically programed behavioral and morphogenetic sequence (11)(12)(13)(14); in the absence of such inducers, the larvae do not settle or metamorphose (11)(12)(13)(14).…”

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Availability of chemosensory receptors is down-regulated by habituation of larvae to a morphogenetic signal.

Trapido-Rosenthal¹,

Morse²

1986

Proc. Natl. Acad. Sci. U.S.A.

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Larvae of the gastropod mollusc Haliotis rufescens are induced to settle from the plankton and metamorphose in response to exogenous y-aminobutyric acid (GABA) and a number of GABA-mimetic compounds, including a GABA-mimetic inducer uniquely associated with the surfaces of the naturally recruiting algae. Previous evidence has shown that recognition of these inducers is mediated by specialized chemosensory receptors on the larval epithelium and that transduction of the morphogenetic signal then is mediated by cAMP and excitatory depolarization. We demonstrate here the specific and saturable labeling of a population of larval receptors with the GABA analog f-(p-chlorophenyl)-[3H]GABA ([3H]baclofen); identification of these labeled receptors with those controlling metamorphosis is suggested by four independent criteria: (i) the effectiveness of GABA and its close structural analogs to induce metamorphosis is closely correlated with the effectiveness ofthese compounds to compete for binding to this receptor; (ii) the natural inducer purified from the recruiting algae competes for binding to this receptor; (iii) (-)-[3H]baclofen specifically bound to the receptors is shed from the larvae after %20 hr, at the time corresponding to the metamorphic abscission and shedding of sensory cilia and other structures from the larvae; and (iv) the availability of the receptors for labeling and the ability of the larvae to respond to GABA and GABA analogs can be down-regulated in parallel by habituation of the larvae early in their development. These down-regulated larvae are fully capable of settlement and metamorphosis in response to agents that elevate intracellular cAMP or depolarize the chemosensory membrane, confirming that down-regulation is confined to the receptors, with no effect on the postreceptor pathway. The results reported here thus suggest that the sensitivity of marine invertebrate larvae to morphogenetic stimuli from the environment can be downregulated by reduction in the number of chemosensory receptors available for interaction with the molecules that induce settlement and metamorphosis. In this respect, chemosensory receptors for environmental and morphogenetic signals are demonstrated biochemically to respond to habituation in a similar manner to neuronal and hormonal receptors.Larvae of many benthic marine invertebrate animals, after dispersal in the plankton, are induced to settle and metamorphose only upon recognition of specific substrata (1-8). Larvae (0.2 mm) of the Pacific red abalone, Haliotis rufescens, a gastropod mollusc, are induced to settle, attach to substrata, and metamorphose by chemosensory recognition of y-aminobutyric acid (GABA)-mimetic molecules that are uniquely associated with the surfaces of crustose red algae (9, 10). These purified natural inducers alone, GABA, and a number of GABA analogs are sufficient to induce this genetically programed behavioral and morphogenetic sequence (11-14); in the absence of such inducers, the larvae do not settle or metamorphose (11)(12)(13)...

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Recruitment and metamorphosis of Haliotis larvae induced by molecules uniquely available at the surfaces of crustose red algae

Cited by 276 publications

References 37 publications

Photosynthesis, respiration and calcification in the Mediterranean crustose coralline algaLithophyllum cabiochae(Corallinales, Rhodophyta)

Photosynthesis, respiration and calcification in the Mediterranean crustose coralline algaLithophyllum cabiochae(Corallinales, Rhodophyta)

Seed production and juvenile rearing of the tropical abalone Haliotis varia Linnaeus 1758

Availability of chemosensory receptors is down-regulated by habituation of larvae to a morphogenetic signal.

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