Developmental changes in cnida composition of the coral Pocillopora damicornis

Paruntu, Carolus P.; Hidaka, Kei; Hidaka, Michio

doi:10.3755/jcrs.2000.23

Cited by 9 publications

(11 citation statements)

References 10 publications

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“…However, species that broadcast-spawn gametes, including 85% of all scleractinians (and all species used in this study), have an obligate planktonic period of ;12-36 h, during which embryogenesis occurs and larvae become motile Wallace 1990, Baird et al 2009). Additional time may be required to develop the capacity to attach to the substrate and metamorphose (Paruntu et al 2000). One way to approximate such a time delay parsimoniously is to assume that the rate of acquisition of competence is zero until this obligate period has expired:…”

Section: A Model Of Dispersal Potentialmentioning

confidence: 99%

Estimating dispersal potential for marine larvae: dynamic models applied to scleractinian corals

Connolly

Baird

2010

Ecology

187

184

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Dispersal influences ecological dynamics, evolution, biogeography, and biodiversity conservation, but models of larval dispersal in marine organisms make simplifying assumptions that are likely to approximate poorly the temporal dynamics of larval survival and capacity for settlement. In particular, larval mortality rates are typically assumed to be constant throughout larval life; and all larvae are frequently assumed to acquire and lose competence at the same time. To improve upon these assumptions, we here develop simple models of dispersal potential that incorporate rates of mortality, and acquisition and loss of settlement competence. We fit these models to empirical competence and survival data for five scleractinian coral species, to test the models' ability to characterize empirical survival and competence patterns, and to estimate the dispersal potential implied by those patterns. The models fit the data well, incorporating qualitative features of competence and survival that traditional approaches to modeling dispersal do not, with important implications for dispersal potential. Most notably, there was high within-cohort variation in the duration of the competent period in all species, and this variation increases both self-recruitment and long-distance dispersal compared with models assuming a fixed competent period. These findings help to explain the seeming paradox of high genetic population structure, coupled with large geographic range size, observed in many coral species. More broadly, our approach offers a way to parsimoniously account for variation in competence dynamics in dispersal models, a phenomenon that our results suggest has important effects on patterns of connectivity in marine metapopulations.

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Section: A Model Of Dispersal Potentialmentioning

confidence: 99%

Estimating dispersal potential for marine larvae: dynamic models applied to scleractinian corals

Connolly

Baird

2010

Ecology

187

184

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“…Paruntu et al () investigated the difference in cnida complement between larvae and polyps in the tropical coral P. damicornis , and found that planulae had abundant spirocysts that had decreased significantly during the process of settling, and the authors suggested these to be involved in substrate attachment. Hayashibara et al () found spirocysts to be used in settling also in the coral A. nasuta , while the actinula larva of the hydrozoan T. mesembryanthemum (syn.…”

Section: Discussionmentioning

confidence: 99%

“…A larger attachment area is beneficial when handling large prey, but for primary attachment of a planula, a smaller attachment surface area (fewer fibrillae/ adhesive strands) is probably sufficient and more economic to produce, and also easier to detach from. Paruntu et al (2000) investigated the difference in cnida complement between larvae and polyps in the tropical coral P. damicornis, and found that planulae had abundant spirocysts that had decreased significantly during the process of settling, and the authors suggested these to be involved in substrate attachment. Hayashibara et al (2000) found spirocysts to be used in settling also in the coral A. nasuta, while the actinula larva of the hydrozoan T. mesembryanthemum (syn.…”

Section: Comparison Of Larval and Adult Cnidomes And Their Functionsmentioning

confidence: 99%

“…Hayashibara, Kimura, and Hatta (2000) found that the maximum abundance of cnidocysts coincided with a peak of settling in larvae of the tropical coral Acropora nasuta and suggested cnidae to be a good marker for larval maturity. Other studies have also shown a unique cnida complement in cnidarian planulae, in comparison to adults (Holst, Sötje, Tiemann, & Jarms, 2007;Paruntu, Hidaka, & Hidaka, 2000;Zenkert, Takahashi, Diesner, & Özbek, 2011). In addition, Abelson, Weihs, and Loya (1994) showed that planulae of coral species that colonize protruding bodies are using mucus strings (or some kind of adhesive filament) to be able to settle in this preferred habitat.…”

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confidence: 96%

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The cnidome and ultrastructural morphology of late planulae in Lophelia pertusa (Linnaeus, 1758)—With implications for settling competency

2019

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The larval pre‐competency period and competency window are important in delimiting the potential dispersal distance for pelagic larvae of sessile marine fauna. Here, we provide evidence for morphological changes in the late planulae of Lophelia pertusa that have implications for their dispersal potential. Three weeks after spawning, the planulae gain functional cnidocysts, indicating that they are competent to settle at this time. Cnidae have been shown to be used for primary anchoring during settling, and before this time point, the larvae most probably do not have the ability to attach to a substrate in high flow conditions. The appearance of functional cnidae coincides with larvae gaining a flexible mouth that can be opened to the full width of the larva. The larval isorhizas differ the most from the adult polyps isorhizas, while the p‐ and b‐mastigophores bear more resemblance to the adult homologues of similar size. The external and internal morphology of late planulae is further described with demonstration of long apical cilia and its effect on swimming agility, morphological changes of the ciliated cells in the larval mouth region and an internal nerve plexus. This study also indicates that L. pertusa planulae seek out cryptic spaces for settling.

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“…Tentakel-tentakel penyapu dari polip sudah dianggap sebagai organorgan agresif dari karang, yang memiliki komposisi nematosit berbeda dari pada tentakel-tentakel biasa dari polip (den Hartog 1977;Hidaka dan Yamazato 1984;Hidaka et al 1987; Peach dan Guldberg http://ejournal.unsrat.ac.id/index.php/JPKT 1999). Paruntu (1996) dan Paruntu et al (2000) telah memperlihatkan bahwa komposisi cnidae berubah selama fase-fase perkembangannya, yaitu mulai dari fase planulae sampai pada polip dewasa dari Pocillopora damicornis. Planulae Pocillopora damicornis mempunyai tipe holotrichous isorhizas (HI) besar yang mana itu tidak hadir pada polip dewasa (Hidaka 1991;Paruntu 1996, Paruntu et al 2000.…”

Section: Pendahuluanunclassified

Nematosit Dari Tiga Spesies Karang Scleractinia, Genus Pocillopora

Paruntu

Rifai

Kusen

2013

JPKT

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Nematosit dari tiga spesies karang Scleractinia, yaitu Pocillopora eydouxi, Pocillopora woodjonesi dan Pocillopora verrucosa yang mendiami terumbu karang di kawasan Pantai Malalayang, Manado, Provinsi Sulawesi Utara diteliti dalam penelitian ini. Dari 25 tipe nematosit utama yang dikenal dalam filum Cnidaria, dua tipe di antaranya dijumpai pada ketiga spesies ini. Dua tipe utama nematosit, yaitu holotrichous isorhizas (HI) dan microbasic p-mastigophores (MpM) teramati pada P. eydouxi dan P. woodjonesi, dan hanya satu tipe, yaitu microbasic p-mastigophore (MpM) diamati pada P. verrucosa. Komposisi nematosit pada P. eydouxi serupa dengan P. woodjonesi, tetapi sangat berbeda dari P. verrucosa. Ukuran HI adalah berbeda antara P. eydouxi dan P. woodjonesi, dan juga ukuran MpM berbeda antara P. verrucosa dan P. eydouxi atau P. woodjonesi. Hasil pengamatan menunjukkan bahwa komposisi dan dimensi nematosit cenderung bervariasi di antara ketiga spesies ini, walaupun berada dalam satu genus. Perbedaan-perbedaan dalam nematosit ini diusulkan untuk dapat digunakan dalam klasifikasi karang. Kata kunci: Pocillopora eydouxi, Pocillopora woodjonesi, Pocillopora verrucosa, nematosit, holotrichous isorhizas (HI), microbasic p- mastigophore (MpM). Nematocysts of three Scleractinian corals, i.e., Pocillopora eydouxi, Pocillopora woodjonesi and Pocillopora verrucosa occurring in the reef of the coastal area of Malalayang, Manado, North Sulawesi Province were studied. Of the 25 major types of nematocysts recognized in the phylum of Cnidaria, two types were encountered in these three corals. Two major types of holotrichous isorhizas (HI) and microbasic p-mastigophores (MpM) were observed in P. eydouxi and P. woodjonesi, and only one type of microbasic p-mastigophore (MpM) was observed in P. verrucosa. The nematocyst composition of P. eydouxi was similar to that of P. woodjonesi, but markedly different from that of P. verrucosa. The size of HI was different between P. eydouxi and P. woodjonesi, and also the size of MpM was different between P. verrucosa and P. eydouxi or P. woodjonesi. The present observation showed that nematocyst composition and dimension might be varied among these three corals. It is suggested that the differences in the nematocysts could be used in the classification of corals. Keywords: Pocillopora eydouxi, Pocillopora woodjonesi, Pocillopora verrucosa, nematocysts, holotrichous isorhizas (HI), microbasic p- mastigophore (MpM).

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Developmental changes in cnida composition of the coral Pocillopora damicornis

Cited by 9 publications

References 10 publications

Estimating dispersal potential for marine larvae: dynamic models applied to scleractinian corals

Estimating dispersal potential for marine larvae: dynamic models applied to scleractinian corals

The cnidome and ultrastructural morphology of late planulae in Lophelia pertusa (Linnaeus, 1758)—With implications for settling competency

Nematosit Dari Tiga Spesies Karang Scleractinia, Genus Pocillopora

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