Age- and size-dependent growth and mortality in a population of Fucus distichus

Ang, Po

doi:10.3354/meps078173

Cited by 32 publications

(24 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This may be due to a greater mortality of the small plants over this period. However, the trend became less consistent in summer probably due to increased mortality of the larger plants (Ang 1991b). This seems to be the case for the density squares as well.…”

Section: Seeded Density Blocksmentioning

confidence: 83%

See 1 more Smart Citation

Density-dependence in a population of Fucus distichus

Ang¹,

Wreede²

1992

Mar. Ecol. Prog. Ser.

Self Cite

View full text Add to dashboard Cite

Regulation of a Fucus djstichus L. emend. Powell population is probably mediated through a density-dependent mortality of the recruits. Blocks seeded with different densities of germlings of E distichusand cleared plots with naturally occurring recruits of different densities and with artificially thinned densities were used to monitor the effect of density on mortality and growth among recruits in a populat~on of F: distjchus in False Creek. Vancouver, British Columbia. Canada. In the first 2 mo of development, germlings on the high density blocks experienced a lower mortality than those on the low density blocks. At later stages (> 2 mo), the effect of density on mortality was reversed. Plants recruited into the cleared plots were > 1 mm in length and they also experienced a positive effect of density on mortality. In both the density blocks and cleared plots, plant mortality eventually became independent of plant density. Plant growth rate was generally not related to density but was related to plant size (length). There was a large variation in the sizes of the plants. All 3 measures of si7c inequality: zero-centered skewness, coefficient of variation, and Gini coefficient are significantly correlated. Plants in both the density blocks and cleared plots showed a slight tendency towards a more normal or positively skewed size distribution from fall 1986 to spring 1987, probably due to an increased mortality of the smaller plants during this time. The mechanism of dominance-suppression and difference in the intrinsic growth rate or timing of settlement probably all contributed to the inequality in size distribution.

show abstract

Section: Seeded Density Blocksmentioning

confidence: 83%

“…As suggested in Ang (1991a), this mechanism could improve the chances of survival of Fucus germlings and make possible the existence of a 'germling bank'. On the other hand, prolonged exposure during summer low tide may exert a heavy toll on the larger plants (Ang 1991b).…”

Section: Seeded Density Blocksmentioning

confidence: 99%

Density-dependence in a population of Fucus distichus

Ang¹,

Wreede²

1992

Mar. Ecol. Prog. Ser.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Decay and erosion of receptacles is the main reason for this negative growth. As reflected in the phenology of the Fucus distichus population, plant length is positively correlated with reproduction (Pearson's linear correlation coefficient; r = 0.60, p = 0.001, n = 26; see also Ang 1991a), but is negatively correlated with growth rate (Ang 1991b). Reproduction takes place at a time when plants reach their maximum size.…”

Section: Discussionmentioning

confidence: 99%

Cost of reproduction in Fucus distichus

Ang¹

1992

Mar. Ecol. Prog. Ser.

Self Cite

View full text Add to dashboard Cite

Reproductive effort (ratio of fertile to total plant dry weight) was measured in Fucus distichus L. emend. Powell. On average, 12.7 % of plant dry weight is in reproductive biomass and this amount is relatively constant over most months. Reproductive effort does not vary among plants of different sizes and dry weights. However, fertile plants are significantly (p ~0 . 0 5 ) bigger than the nonfertile plants, and have a better survival rate. There is no clear indication of cost of reproduction with respect to the longevity of fertile vs non-fertile plants. Fertile plants, especially those > 17 cm in length, tend to exhibit negative or zero growth much more often than non-fertile plants, suggesting that the cost of reproduction may be manifested in the form of reduced growth, rather than in greater mortality or shorter longevity of the fertile plants. The failure to detect cost of reproduction with respect to mortality and longevity may be due to the modular nature of the plants, where cost occurs at the level of the modules (branches) rather than at the level of the whole plant.

show abstract

“…Second, the small initial size of individuals in the full removal treatments may have delayed canopy closure. Ang (1991b) showed that small F. distichus grew slower than larger individuals at some times but not at others. Malm et al (1999) found that F. vesiculosus regenerating from holdfasts grew 3-10 times faster than sexually produced recruits.…”

Section: Discussionmentioning

confidence: 99%