Ecology of Chondrus crispus Stackhouse on the Northern Coast of Spain. II. Reproduction

Fernández, Consolación; Menéndez, M. P.

doi:10.1515/botm.1991.34.4.303

Cited by 13 publications

(6 citation statements)

References 10 publications

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“…A t-test showed no significant difference between these populations and the overall mean in our entire analysis. A further attempt This assumption is consistent with results of Bhattacharya (1984Bhattacharya ( , 1985 and Fernández and Menéndez (1991). Given the similarities in size and shape of cystocarpic and tetrasporophytic fronds, and the apparent absence of biomechanical properties leading to selective frond removal that might be associated with carrageenan differentiation in C. crispus (Carrington et al 2001), gametophytic dominance of 2 : 1 would be an expected ratio.…”

Section: Resultssupporting

confidence: 76%

“…These factors were emphasized in theoretical models developed by Scrosati and DeWreede (1999), Fierst et al (2005) and Gaines (2003, 2004). There have been attempts to deal with these issues specifically in C. crispus from Nova Scotia and northern Spain (Bhattacharya 1984, 1985, Fernández and Menéndez 1991, Scrosati et al 1994. The latter concluded that spore production in the two phases was roughly equivalent (8 gametophytes) are consistent with other values from the Atlantic coast of Nova Scotia by Bhattacharya (1984) Our collections from fully marine sites in the Bay of Fundy showed variation from 63-90% gametophytes, i.e., ca.…”

Section: Resultssupporting

confidence: 66%

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Temporal and spatial variation in the distribution of life history phases of Chondrus crispus (Gigartinales, Rhodophyta)

Garbary¹,

Tompkins²,

White³

et al. 2011

ALGAE

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Thirty populations of Chondrus crispus Stackhouse from Nova Scotia were collected during the years 1993 to 2011. Taken from estuaries, wave exposed open coasts, high intertidal rock pools and shallow subtidal habitats, the populations were evaluated for relative abundance of tetrasporophytic and gametophytic life history phases. Over 2,800 thalli were characterized using the resorcinol-acetal test to distinguish the kappa-and lambda-carrageenan containing fronds of gametophytes and tetrasporophytes, respectively. These populations had 77 ± 5% gametophytes (mean ± 95% confidence interval), with most populations having gametophyte : sporophyte ratios ranging from 2 : 1 to 9 : 1. No population had a dominance of tetrasporophytes, although two populations had 1 : 1 ratios. A meta-analysis of our data along with previously published accounts showed no significant changes in gametophyte dominance with respect to hypothesized gradients of wave exposure, salinity, or water depth. Significant changes occurred in ratios at five sites where replicate sampling occurred in different years. We conclude that C. crispus in Maritime Canada has a natural ratio of 3 : 1 or greater in stable conditions, and that lower ratios represent recovery from disturbance in which bare substratum is created that is subsequently colonized by carpospores from remaining gametophytic thalli.

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Section: Resultssupporting

confidence: 76%

Section: Resultssupporting

confidence: 66%

Temporal and spatial variation in the distribution of life history phases of Chondrus crispus (Gigartinales, Rhodophyta)

Garbary¹,

Tompkins²,

White³

et al. 2011

ALGAE

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“…At Porz Liogan, the unimodal distribution of gametophytes, and bimodal distribution of tetrasporophytes, were similar to those observed in many locations (Chopin 1986). The reverse type of distribution (bimodal for gametophytes and unimodal for tetrasporophytes) has, however, been reported in Spain (Fernandez & Menendez 1991), and bimodal distribution for both generations has been shown in Canada (Chopin et al 1988). These changes in mode of distribution and in the ratio gametophytes/tetrasporophytes have been attributed, so far, to wave exposure, depth, differential reproductive capacity, harvesting pressure, and substratum disturbance (Prince & Kingsbury 1973, Mathieson & Burns 1975, Craigie & Pringle 1978, Bhattacharya 1985, Chopin et al 1988, Lazo et al 1989; however further investigations, especially over a longer period of time, are needed to check if other parameters could be responsible.…”

Section: Variations Of Total P and Total N Contentsmentioning

confidence: 94%

Eco-physiological and biochemical study of two of the most contrasting forms of Chondrus crispus (Rhodophyta, Gigartinales)

Chopin¹,

Floc′h²

1992

Mar. Ecol. Prog. Ser.

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Seasonal variations of distribution of the gametophytic and tetrasporophytlc generations, growth, carrageenans, phosphorus and nitrogen nutrition, and dry matter content were studied in 2 of the most contrasting forms of the red alga Chondrus crispus Stackhouse in Britanny. France. Seasonal variations of generations were more pronounced in the infralittoral than in the midlittoral form; the former had more reproductively mature plants and twice as many tetrasporophytes. Growth was greater in the infralittoral than in the midlittoral form. Contents of total carrageenans were comparable in the 2 forms; the K -, L -, and p-carrageenan structures did not vary significantly (qualitatively, quantitatively, during the year, or between the 2 forms). The midlittoral form had a higher total phosphorus content, more marked seasonal variations and an earlier spring decline than the infralittoral form Seasonal variations of total nitrogen content had different patterns in the 2 forins during summer The dry matter content of the infralittoral form was lower than that of the midlittoral form. These eco-physiological and biochemical differences and similarities are discussed in terms of the polymorphism of this alga.

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“…However, algal propagules are subjected to many selective influences after release and before settlement (Hoffmann, 1987), perhaps even more than a seed rain, and we may expect to find nonnormal size distributions in recently settled propagule populations. There are very few data sets for seaweeds which allow the examination of this starting point, and data that are available are derived from studies considering other aspects of seaweed ecology (Mshigeni, 1976;Ngan & Price, 1979;Fernandez & Menendez, 1991;Destombe et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

The development of size structure in a youngFucus serratuspopulation

Creed

Norton

Harding

1996

European Journal of Phycology

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Artificial discs were used to monitor the settlement and development of Fucus serratus propagules in five areas cleared of an adult canopy, in order to test the assumptions that sizes of recently settled propagules are normally distributed but that over time plant sizes become more variable and hierarchical. Settlement was spatially (3-20 m) variable only at the beginning and end of the settlement period, and at the time when most settlement took place (88% in a fortnight) no differences between areas were found. Increases in the skewness coefficient, Gini coefficient and coefficient of variation confirmed that there was not a size hierarchy in the recently settled population, but 8 months later sizes of plants were variable and a positive skew in plant sizes (many small and few big) developed. Mortality was high at first (70% in 1 month) but fell considerably later. F. serratus behaves like most higher plants with respect to changing population structure. The observed change in population structure provided evidence of how a "seed bank" develops in an algal population, as I year after settlement an estimated 37 000 plants m 1 are still

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Ecology of Chondrus crispus Stackhouse on the Northern Coast of Spain. II. Reproduction

Cited by 13 publications

References 10 publications

Temporal and spatial variation in the distribution of life history phases of Chondrus crispus (Gigartinales, Rhodophyta)

Temporal and spatial variation in the distribution of life history phases of Chondrus crispus (Gigartinales, Rhodophyta)

Eco-physiological and biochemical study of two of the most contrasting forms of Chondrus crispus (Rhodophyta, Gigartinales)

The development of size structure in a youngFucus serratuspopulation

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