Structure and development of air bladders in<i>Fucus</i>and<i>Ascophyllum</i>(Fucales, Phaeophyceae)

Garbary, David J.; Brackenbury, Angela; McLean, Alicia M.; Morrison, D.

doi:10.2216/05-62.1

Cited by 12 publications

(13 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This suggests that the annual growth is independent of frond age. Because one can assume that older fronds will be larger and therefore have higher photosynthetic capabilities, it indicates that the fronds may be devoting their energy to other factors, such as annual reproductive output, repairing damaged frond segments (e.g., bladders, Garbary et al 2006), growth of vegetative lateral branches, or increasing production of phlorotannins to deter herbivores (Pavia et al 1999).…”

Section: Discussionmentioning

confidence: 99%

Developmental and Environmental Sources of Variation on Annual Growth Increments of Ascophyllum nodosum (Phaeophyceae)

Eckersley¹,

Garbary²

2007

ALGAE

Self Cite

View full text Add to dashboard Cite

Annual growth segments of Ascophyllum nodosum (L.) Le Jolis (Fucales, Fucaceae) are denoted by air bladders that form each spring. By examining annual growth segments, it may be possible to infer information about the physical conditions during the growth period; however, it is uncertain whether the annual segments will expand in size after the initial growth. We examined A. nodosum segments from three populations in Nova Scotia, and statistically evaluated whether the annual growth (length, mass, and maximum diameter) of segments was independent of the age of the frond, whether the segments increased in size after the initial growth, and whether the segment lengths were correlated with mean water temperatures and mean air temperatures when the segments were formed. We found that the growth in length of A. nodosum is dependent on the age of the frond, but frond age explained less than 12 % of the overall variation in length. However, the mass and maximum diameter of segments were independent of the age of the frond. Differences occurred between the lengths of segments formed in different years, but there was no significant correlation with regional mean water or air temperatures. This study indicates that the length of A. nodosum segments may be an indicator of the annual physical characteristics of a site, but future studies are needed to identify which factors have the strongest influence on growth patterns.

show abstract

Section: Discussionmentioning

confidence: 99%

Developmental and Environmental Sources of Variation on Annual Growth Increments of Ascophyllum nodosum (Phaeophyceae)

Eckersley¹,

Garbary²

2007

ALGAE

Self Cite

View full text Add to dashboard Cite

show abstract

“…Like other taxa known to drift, H. banksii has structures that may assist flotation. Thalli of H. banksii consist of branched chains of fluid‐filled vesicles, contrary to other fucoids where air bladders are small and/or exist only on part of the thallus (e.g., F. vesiculosus, Garbary et al. 2006).…”

mentioning

confidence: 99%

DISPERSAL OF HORMOSIRA BANKSII (PHAEOPHYCEAE) VIA DETACHED FRAGMENTS: REPRODUCTIVE VIABILITY AND LONGEVITY¹

McKenzie

Bellgrove

2008

Journal of Phycology

View full text Add to dashboard Cite

Drifting, fertile thalli are well documented to be the primary long-distance dispersal vector for many marine macroalgae, but little information about reproductive viability of drift is known. This study examined the reproductive viability and longevity of floating fragments of the intertidal Australasian fucoid Hormosira banksii (Turner) Decne. Beach wrack surveys and field experiments were conducted to test the model that long-distance dispersal is achieved in H. banksii via floating, fertile fronds. High densities of beach wrack fragments were evident during summer compared to autumn. The majority of beach wrack occurred on sandy beaches rather than rocky shores. Both male and female fragments were present in the beach wrack. Detached fronds were capable of releasing gametes up to 8 weeks after detachment. Beach wrack produced high fertilization rates and recruited successfully onto artificial panels. Results suggest that detached fragments are reproductively viable and that floating, fertile fronds may be an important mechanism for facilitating long-distance dispersal in this species. Nevertheless, the frequency of fronds reaching a suitable habitat and contributing to gene flow between populations, or colonizing new populations, may not be proportional to the total density of beach wrack.

show abstract

“…Previous studies by Damant (1937) showed that bladder position, which correlates with age, generated distinct pressure changes. Furthermore Garbary et al (2006) showed a developmental change in bladder size and wall thickness with age in A. nodosum from Tor Bay and nearby sites. Given these results, differences in air bladder physiology might be expected.…”

Section: Discussionmentioning

confidence: 91%

“…1) was collected at Tor Bay, Nova Scotia (45.18°N, 61.35°W) in early August 2005. This site is exposed to moderate wave action and full salinity (> 30 psu) (Garbary et al 2006). Specimens were collected at midday during low tide and clear sunny conditions.…”

Section: Methodsmentioning

confidence: 99%

“…Although Hurka (1974) suggests that bladders are an adaptation against physical damage from wave action, most authors consider bladders an adaptation for light and nutrient acquisition in stands with extremely high frond densities. Garbary et al (2006) provided a detailed morphological and developmental account of bladders in Ascophyllum nodosum. A key observation was that the bladder wall varied in thickness during development with older bladders having thicker walls as previously documented by Damant (1937).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Air Pressure Regulation in Air Bladders of Ascophyllum nodosum(Fucales, Phaeophyceae)

Brackenbury¹,

Kang²,

Garbary³

2006

ALGAE

Self Cite

View full text Add to dashboard Cite

Diurnal and age-related changes in air pressure were measured in air bladders of Ascophyllum nodosum from the Atlantic coast of Nova Scotia. Exterior and interior bladder volumes vary significantly with 4 and 6 y bladders being about 40% larger than 2 y bladders (p < 0.01). Freshly collected bladders yielded a mean pressure of 40.8 ± 6.5 cm H 2 O. Overnight (20 h) dark treatment at 15°C generated pressure reductions by 80% in 2 y bladders but only by about 30% in 4 and 6 y bladders. Furthermore, in 2 y bladders 8 out of 11 bladders were reduced to atmospheric pressure. Pressure losses were inversely related to pressure recovery after 2.5 h in natural daylight, but after 5 h in daylight there was no significant difference in pressure within the age groups. Even under 25% of full illumination, bladders inflated to full pressure after 5 h. The results show that differences in bladder age and bladder wall thickness have roles in diurnal patterns of bladder inflation and deflation. These results confirm that bladder inflation is based on photosynthetic O 2 production and not on partial pressures of O 2 in the surrounding medium as was suggested for Sargassum. Chemical analyses of fluid recovered after the interior of bladders were washed with saline showed no evidence for the occurrence of surfactant that might be responsible for maintaining the air-liquid interface.

show abstract

Structure and development of air bladders inFucusandAscophyllum(Fucales, Phaeophyceae)

Cited by 12 publications

References 20 publications

Developmental and Environmental Sources of Variation on Annual Growth Increments of Ascophyllum nodosum (Phaeophyceae)

Developmental and Environmental Sources of Variation on Annual Growth Increments of Ascophyllum nodosum (Phaeophyceae)

DISPERSAL OF HORMOSIRA BANKSII (PHAEOPHYCEAE) VIA DETACHED FRAGMENTS: REPRODUCTIVE VIABILITY AND LONGEVITY¹

Air Pressure Regulation in Air Bladders of Ascophyllum nodosum(Fucales, Phaeophyceae)

Contact Info

Product

Resources

About

Structure and development of air bladders inFucusandAscophyllum(Fucales, Phaeophyceae)

Cited by 12 publications

References 20 publications

Developmental and Environmental Sources of Variation on Annual Growth Increments of Ascophyllum nodosum (Phaeophyceae)

Developmental and Environmental Sources of Variation on Annual Growth Increments of Ascophyllum nodosum (Phaeophyceae)

DISPERSAL OF HORMOSIRA BANKSII (PHAEOPHYCEAE) VIA DETACHED FRAGMENTS: REPRODUCTIVE VIABILITY AND LONGEVITY1

Air Pressure Regulation in Air Bladders of Ascophyllum nodosum(Fucales, Phaeophyceae)

Contact Info

Product

Resources

About

DISPERSAL OF HORMOSIRA BANKSII (PHAEOPHYCEAE) VIA DETACHED FRAGMENTS: REPRODUCTIVE VIABILITY AND LONGEVITY¹