Patterns of gametophyte dominance ofIridaea splendens(Rhodophyta) in Vancouver Harbour, Vancouver, British Columbia, Canada

Wreede, Robert E. De; Green, Lesley G.

doi:10.1007/bf02179766

Cited by 41 publications

(28 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A different pattern, where phase dominance over the course of a single year is stable but changes over longer periods, has also been reported (e.g. Hansen and Doyle 1976, Hansen 1977, Dyck et al 1985 and the structure of populations might change over even longer time periods than seasons or years (Dyck et al 1985, De Wreede and Green 1990, Dyck and De Wreede 1995. Dyck and De Wreede (1995) demonstrated that seasonal alternation in life-history phase dominance in a Vancouver population of M. splendens was a result of variation in the rates of density change among the life-history phases of this species.…”

Section: Discussionmentioning

confidence: 93%

“…These ecological patterns include differences among life-history phases in terms of: growth; density; spatial and temporal distribution; perennation; biomechanical properties; salinity; desiccation tolerance; fertilisation success; spore production, germination and survival; and susceptibility to grazing (Craigie and Pringle 1978, Hannach and Santelices 1985, May 1986, Luxoro and Santelices 1989, De Wreede and Green 1990, Dyck and De Wreede 1995, Avila et al 1996, Lindgren and Åberg 1996, Carrington et al 2001, Fierst et al 2005, Guidone and Grace 2010, McLachlan et al 2011. However, Scrosati and De Wreede (1999) stressed the need for a combination of modelling and fieldwork to understand the G:T ratio within populations.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Clump structure, population structure and non-destructive biomass estimation of the New Zealand carrageenophyte Sarcothalia lanceata (Gigartinaceae, Rhodophyta)

Neill

Nelson

Falshaw³

et al. 2016

Botanica Marina

View full text Add to dashboard Cite

Sarcothalia lanceata is a New Zealand carrageenophyte with tetrasporophytic thalli that produce carrageenan very close to the idealised structure of lambda-carrageenan. As such there is interest in its potential for commercial utilisation. There is no information on the biology and ecology of natural populations of this species, but this knowledge is critical for determining whether a species is a suitable candidate for sustainable wild harvest or for aquaculture. Population studies were conducted at two sites in New Zealand's South Island in order to provide fundamental information on this species. The structure (abundance and composition of male, female, tetrasporophytic and non-reproductive clumps) of the two populations was assessed monthly over a year, and population biomass estimated using regression methods. Seasonal variation was not evident in most of the parameters measured, but differences between sites were found in total population density, the density of different life-history phases, and clump size and structure. The turnover in biomass occurs more frequently at the blade level than at the clump level and the presence of a basal crust in this species promotes population stability.

show abstract

Section: Discussionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Clump structure, population structure and non-destructive biomass estimation of the New Zealand carrageenophyte Sarcothalia lanceata (Gigartinaceae, Rhodophyta)

Neill

Nelson

Falshaw³

et al. 2016

Botanica Marina

View full text Add to dashboard Cite

show abstract

“…Annual shifts between haploid and diploid dominance are not uncommon in algal populations Klinger 1988, De Wreede andGreen 1990). In the Austral autumn-winter of 2011, populations in the Palmer area were 78% haploid and 22% diploid, or consisted of 24% tetrasporophyte, 51% sterile gametophytes, and 25% carposporophytes (Figure 2).…”

Section: Discussionmentioning

confidence: 99%

“…The haploid:diploid ratios at all sites were compared between seasons using a paired t-test (SPSS ver. 22, IBM, Foster City, CA, USA) to evaluate whether population demography shifts with season (De Wreede and Green 1990). Endophyte percent coverage data were arc-sin transformed and fertility data were square root transformed to fit the assumptions of normality for all statistical tests.…”

Section: Life History Stagesmentioning

confidence: 99%

“…Populations under adverse conditions, such as the cold temperatures or high disturbance levels characterizing the western Antarctic Peninsula, are hypothesized to be sporophyte dominated (Hansen and Doyle 1976) because diploid individuals have the ability to mask mutations (increased genetic variability; Sosa and Garcia-Reina 1992) and adapt quickly to environmental variation (Bell 1982). Still, there is no pattern describing every species population (De Wreede and Green 1990). By coupling population demography with differential endophyte presence and impacts on fertility in the sexual life histories of I. cordata, we can infer how the known pathogenicity of these predominantly green endophytes (Schoenrock et al 2013, Schoenrock 2014) affects the fitness of populations along the western Antarctic Peninsula.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Life history bias in endophyte infection of the Antarctic rhodophyte, Iridaea cordata

et al. 2015

View full text Add to dashboard Cite

Endophytic organisms are known to have varied effects on their host organism in terrestrial and marine environments. In previous studies on marine algae, these symbioses range from innocuous to pathogenic depending on the host and endophyte species. The present study further assessed a pathogenic relationship between filamentous algal endophytes and a red algal host from the western Antarctic Peninsula. We analyzed endophyte presence (appearance of filamentous thalli) in the three life history stages of Iridaea cordata and potential impacts on fertility in the fertilized female gametophytes (carposporophytes) and tetrasporophytes. We found that endophytes proliferate throughout significantly more thallus area in tetrasporophyte and unfertilized gametophyte hosts than in carposporophyte hosts, but there was no correlation between endophyte cover and fertility in these individuals. This study also provides a demographic analysis of I. cordata populations surrounding Palmer Station, Antarctica, showing that these populations are haploid dominated (∼78% of individuals). The differential presence of filamentous algal endophytes indicates that endophyte pathogenicity indirectly has greater effect on tetrasporophytes and unfertilized gametophytes than on the carposporophytes, which house the products of sexual recombination.

show abstract

Biological basis for the management of ‘luga negra’ (Sarcothalia crispata Gigartinales, Rhodophyta) in southern Chile

Avila

Otaíza

Norambuena

et al. 1996

Fifteenth International Seaweed Symposium

View full text Add to dashboard Cite

Patterns of gametophyte dominance ofIridaea splendens(Rhodophyta) in Vancouver Harbour, Vancouver, British Columbia, Canada

Cited by 41 publications

References 11 publications

Clump structure, population structure and non-destructive biomass estimation of the New Zealand carrageenophyte Sarcothalia lanceata (Gigartinaceae, Rhodophyta)

Clump structure, population structure and non-destructive biomass estimation of the New Zealand carrageenophyte Sarcothalia lanceata (Gigartinaceae, Rhodophyta)

Life history bias in endophyte infection of the Antarctic rhodophyte, Iridaea cordata

Biological basis for the management of ‘luga negra’ (Sarcothalia crispata Gigartinales, Rhodophyta) in southern Chile

Contact Info

Product

Resources

About