Larval Dispersal in the Subtidal Hydrocoral Allopora Californica Verrill (1866)

Ostarello, Georgiandra Little

doi:10.1007/978-1-4757-9724-4_35

Cited by 21 publications

(28 citation statements)

References 2 publications

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“…Creeping colonies are very unusual within Stylasteridae, in fact only Stylantheca species are known to grow according to this strategy. Ostarello (1976) attributed the distribution of new colonies of Stylaster californicus to the strong tendency of the planulae to settle near the parental colony. In situ observations of Stylaster sp.…”

Section: Discussionmentioning

confidence: 97%

Morphology and development of the early growth stages of an Indonesian Stylaster (Cnidaria: Hydrozoa)

Puce

Camillo

et al. 2010

J. Mar. Biol. Ass.

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The aim of this work is to describe the skeletal morphology of the early stages of the colonies of Stylaster sp., settled on artificial panels placed along a coral reef in the Bunaken Marine Park (North Sulawesi, Indonesia). The youngest observed stage deriving from the planula settlement is represented by a well developed primary cyclosystem symmetrically budding two secondary cyclosystems in a very early phase of growth. Successively each cyclosystem starts its vertical growth producing new cyclosystems sympodially arranged. At the same time the basal disc of the first cyclosystem enlarges producing a flattened crust from which new colonies arise. Vertical and encrusting forms are considered different modalities to face the problem of space competition in marine benthic organisms. The colonies of Stylaster sp. grow using both strategies resulting in the asexual reproduction of several colonies from a single settled planula. The new cyclosystems originate as small volcano-like elevations having the centre filled with calcium carbonate. Gradually this calcareous matrix dissolves starting from its perimetric zone and leads to the formation of the gastrostyle and the ring palisade. It is plausible that the cells composing the stolon nets deeply pervading the calcareous structure are responsible for this skeletal plasticity.

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Section: Discussionmentioning

confidence: 97%

Morphology and development of the early growth stages of an Indonesian Stylaster (Cnidaria: Hydrozoa)

Puce

Camillo

et al. 2010

J. Mar. Biol. Ass.

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“…Wisshak et al (2009), explaining the skeletal reorganization of Errina dabneyi, noted that the old ampullae are Wlled by carbonate or remain open but embedded while new active ampullae are formed closer to the surface. Moreover, several authors suggest that the ampullae do not go to waste and, in this way, they are used repeatedly (Broch 1942;Moseley 1881;Ostarello 1973). In light of these suggestions, the small irregular cavities of Stylaster sp.…”

Section: Reproductive Structuresmentioning

confidence: 99%

Three-dimensional analysis of the canal network of an Indonesian Stylaster (Cnidaria, Hydrozoa, Stylasteridae) by means of X-ray computed microtomography

et al. 2011

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This study describes the architecture of the coenosteal network in an Indonesian Stylaster species investigated by means of the X-ray computed microtomography (μ-CT) technique. The 3D approach allowed to characterize all internal cavity structures: a network of thin canals, gastropores, dactylopores, and ampullae. The main feature highlighted by this reconstruction is a dense network of thin canals extended to the entire colony. This network gives rise to and surrounds each cyclosystem. Moreover, the 3D analysis made it possible to study the reciprocal relationship between adjacent cyclosystems and to hypothesize the growth process of the branches of Stylaster sp.: each new cyclosystem buds between the gastropore and the dactylopores of the last formed one. The dactylopores of each cyclosystem are partially derived from the precedent one and are partially newly formed. The thin canals enveloping the dactylopores are actively involved in both the formation of a new gastropore and in the re-establishment of the typical amount of dactylopores in each cyclosystem. This growth process was confirmed by the scanning electron microscopy (SEM) observations of apical cyclosystems of several specimens. Results indicate that the non-destructive X-ray μ-CT technique can be fruitfully applied to characterize the coenosteal structures of stylasterids allowing the repetitive study of a specimen by means of virtually infinite section planes and different kinds of analyses (e. g., channel width and porosity)

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“…Limited dispersal oflarvae (in some cases less than 1 m) has been observed directly in many benthic marine taxa, including algae (paine 1979), sponges (Bergquist et al 1970), cnidarians (Ostarello 1976;Gerrodette 1981), molluscs (Janson 1983), crustaceans (Knowlton and Keller 1986), bryozoans (Keough and Chernoff 1987) and ascidians (Olson 1985;Grosberg 1987). Such philopatric dispersal should lead to increased genetic subdivision between populations and to greater speciation rates caused by decreased gene flow (Scheltema 1971;Hansen 1978;Stanley 1979;Jablonski 1986).…”

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RELATIONSHIPS BETWEEN INFERRED LEVELS OF GENE FLOW AND GEOGRAPHIC DISTANCE IN A PHILOPATRIC CORAL,BALANOPHYLLIA ELEGANS

1994

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Abstract. -When the dispersal capability of a species is considerably less than its geographic range, genetic differences between populations should increase with the distance separating those populations. This pattern should be most evident in linearly distributed species. The sessile solitary cup coral Balanophyllia elegans lives along nearly the entire Pacific coast of North America, yet its crawling larvae usually settle within 40 em oftheir birthplace. In this paper, I document geographic patterns of allozyme differentiation within and among populations of B. elegans and estimate the proportion of observed geographic pattern attributable to gene flow between adjacent populations.Genetic subdivision among localities separated by up to 3000 Ian was high (F ST = 0.283, SE = 0.038). Inferred gene flow between pairs of localities (M, individuals per generation) correlated inversely with the geographic distance between those localities, consistent with the pattern expected for a species at equilibrium in which gene flow occurred exclusively between adjacent localities. Within localities, patches separated by 4 to 30 m were also significantly subdivided, but genetic differentiation between patches did not vary significantly with the distance separating them. Simulations revealed that the power to detect genetic pattern expected from gene flow between adjacent populations increased with both the number of loci used to infer gene flow and the heterozygosity of those loci. Simulations also verified that when geographic distance poorly approximated the number of steps between populations, reduced major-axis regression more accurately portrayed the structural relationship between gene flow and separation than did ordinary least-squares regression. Attenuation of gene flow with distance explained 15% of the between-locality pattern of genetic differentiation in B. elegans. The remaining variation appeared to be due to neither natural selection nor a recent rangewide recolonization. Loci from the northern sampled localities, however, had fewer alleles than those from the remainder of the range, suggesting these localities had been recolonized recently following Pleistocene cooling.

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Larval Dispersal in the Subtidal Hydrocoral Allopora Californica Verrill (1866)

Cited by 21 publications

References 2 publications

Morphology and development of the early growth stages of an Indonesian Stylaster (Cnidaria: Hydrozoa)

Morphology and development of the early growth stages of an Indonesian Stylaster (Cnidaria: Hydrozoa)

Three-dimensional analysis of the canal network of an Indonesian Stylaster (Cnidaria, Hydrozoa, Stylasteridae) by means of X-ray computed microtomography

RELATIONSHIPS BETWEEN INFERRED LEVELS OF GENE FLOW AND GEOGRAPHIC DISTANCE IN A PHILOPATRIC CORAL,BALANOPHYLLIA ELEGANS

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