Surface flow for colonial integration in reef-building corals

Bouderlique, Thibault; Petersen, Julian; Faure, Louis; Abed-Navandi, Daniel; Bouchnita, Anass; Mueller, Benjamin; Nazarov, Murtazo; Englmaier, Lukas; Tesařová, Markéta; Frade, Pedro R.; Zikmund, Tomáš; Koehne, Till; Kaiser, Jozef; Fried, Kaj; Wild, Christian; Pantos, Olga; Hellander, Andreas; Bythell, John C.; Adameyko, Igor

doi:10.1016/j.cub.2022.04.054

Cited by 16 publications

(16 citation statements)

References 44 publications

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“…A colonial modular design is central to the success of scleractinians, because it allows indeterminate size [ 42 ], and the morphologically complex colonies that define this taxon. Through asexual proliferation, polyps remain connected through their gastrovascular cavities [ 43 , 44 ], a common skeleton and surface mucous [ 29 ], allowing networks of connected polyps to achieve properties that are more than the sum of the parts. The early notion that this design facilitates isometry [ 42 , 45 ] has been replaced by an expectation of allometry that is consistent with the contemporary understanding of scaling in this taxon [ 17 , 18 ], as well as the mechanisms integrating polyps [ 28 , 29 ] and determining their size [ 15 , 46 ].…”

Section: Discussionmentioning

confidence: 99%

“…Through asexual proliferation, polyps remain connected through their gastrovascular cavities [ 43 , 44 ], a common skeleton and surface mucous [ 29 ], allowing networks of connected polyps to achieve properties that are more than the sum of the parts. The early notion that this design facilitates isometry [ 42 , 45 ] has been replaced by an expectation of allometry that is consistent with the contemporary understanding of scaling in this taxon [ 17 , 18 ], as well as the mechanisms integrating polyps [ 28 , 29 ] and determining their size [ 15 , 46 ]. Nonetheless, the functional implications of corallum morphology remain incompletely known.…”

Section: Discussionmentioning

confidence: 99%

“…In branching corals, the physical and chemical conditions experienced by polyps in the interstices among branches are unlike those of ambient seawater [ 23 , 24 ], causing physiological processes in large colonies to differ from those of small colonies [ 25 ]. These effects are probably accentuated by confluent tissues and a common skeleton, which facilitate translocation of metabolites [ 26 , 27 ], the distribution of light [ 28 ], and the flow of mucus across the tissue [ 29 ]. Finally, polyp dimensions (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Branching coral morphology affects physiological performance in the absence of colony integration

2022

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For nearly 50 years, analyses of coral physiology have used small coral fragments (nubbins) to make inferences about larger colonies. However, scaling in corals shows that linear extrapolations from nubbins to whole colonies can be misleading, because polyps in nubbins are divorced of their morphologically complex and physiologically integrated corallum. We tested for the effects of integration among branches in determining size-dependent calcification of the coral Pocillopora spp. under elevated P CO 2 . Area-normalized net calcification was compared between branches (nubbins), aggregates of nubbins (complex morphologies without integration) and whole colonies (physiologically integrated) at 400 versus approximately 1000 µatm P CO 2 . Net calcification was unaffected by P CO 2 , but differed among colony types. Single nubbins grew faster than whole colonies, but when aggregated, nubbins changed calcification to match whole colonies even though they lacked integration among branches. Corallum morphology causes the phenotype of branching corals to differ from the summation of their branches.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Branching coral morphology affects physiological performance in the absence of colony integration

2022

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“…(except in homoscleromorph sponges that have ciliated surfaces), where they are sparsely distributed and probably not motile. 43 Moreover, the mucus transport rate on A. archeri (0.15-5.86 mm s À1 ) is two to four orders of magnitude slower than mucus transport in, e.g., human airways (70-117 mm s À1 ), 44 corals (up to 984 mm s À1 ), 31 or the feeding ridges of oysters (2,180 mm s À1 ). 45 Together, these findings suggest that our observations are not driven by ciliary motion, and therefore point to a novel mechanism of mucus transport in sponges.…”

Section: Llmentioning

confidence: 98%

“…Moreover, it would prevent clogging of the sponges' filtration system during periods of high turbidity, as suggested previously. 6,26 Mucus secretion and directed movement of mucus to transport particulate waste is a well-known strategy in other animals, such as corals, 30,31 and occurs in the human respiratory tract. 32,33 To this end, sponges may sneeze in a way analogous to human sneezing, by moving particle-laden mucus and ejecting this material into their surroundings via coordinated cycles of contraction and relaxation that propagate through (parts of) their bodies.…”

Section: Llmentioning

confidence: 99%

Sponges sneeze mucus to shed particulate waste from their seawater inlet pores

et al. 2022

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Intra‐colony spatial variance of oxyregulation and hypoxic thresholds for key Acropora coral species

Dilernia,

Woodcock,

Camp

et al. 2024

Ecology and Evolution

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Oxygen (O2) availability is essential for healthy coral reef functioning, yet how continued loss of dissolved O2 via ocean deoxygenation impacts performance of reef building corals remains unclear. Here, we examine how intra‐colony spatial geometry of important Great Barrier Reef (GBR) coral species Acropora may influence variation in hypoxic thresholds for upregulation, to better understand capacity to tolerate future reductions in O2 availability. We first evaluate the application of more streamlined models used to parameterise Hypoxia Response Curve data, models that have been used historically to identify variable oxyregulatory capacity. Using closed‐system respirometry to analyse O2 drawdown rate, we show that a two‐parameter model returns similar outputs as previous 12th‐order models for descriptive statistics such as the average oxyregulation capacity (Tpos) and the ambient O2 level at which the coral exerts maximum regulation effort (Pcmax), for diverse Acropora species. Following an experiment to evaluate whether stress induced by coral fragmentation for respirometry affected O2 drawdown rate, we subsequently identify differences in hypoxic response for the interior and exterior colony locations for the species Acropora abrotanoides, Acropora cf. microphthalma and Acropora elseyi. Average regulation capacity across species was greater (0.78–1.03 ± SE 0.08) at the colony interior compared with exterior (0.60–0.85 ± SE 0.08). Moreover, Pcmax occurred at relatively low pO2 of <30% (±1.24; SE) air saturation for all species, across the colony. When compared against ambient O2 availability, these factors corresponded to differences in mean intra‐colony oxyregulation, suggesting that lower variation in dissolved O2 corresponds with higher capacity for oxyregulation. Collectively, our data show that intra‐colony spatial variation affects coral oxyregulation hypoxic thresholds, potentially driving differences in Acropora oxyregulatory capacity.

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Surface flow for colonial integration in reef-building corals

Cited by 16 publications

References 44 publications

Branching coral morphology affects physiological performance in the absence of colony integration

Branching coral morphology affects physiological performance in the absence of colony integration

Sponges sneeze mucus to shed particulate waste from their seawater inlet pores

Intra‐colony spatial variance of oxyregulation and hypoxic thresholds for key Acropora coral species

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