Development and phenology of Ecklonia radiata at two depths in Goat Island Bay, New Zealand

Novaczek, Irené

doi:10.1007/bf00393117

Cited by 67 publications

(49 citation statements)

References 10 publications

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“…Both annual (L. ephemera) and perennial kelps (L. setchelli) exhibit this variability. Novaczek (1984) found a two-fold difference in reproductive effort between subtidal populations of E. radiata at -7m (20%) and -15m (10%). Aruga, Toyoshima & Yokohama (1990) stated that sorus portions of bladelets (i.e.…”

Section: Fucus Distichusmentioning

confidence: 89%

Patterns of fucoid reproductive biomass allocation

Mathieson

Guo

1992

British Phycological Journal

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Section: Fucus Distichusmentioning

confidence: 89%

Patterns of fucoid reproductive biomass allocation

Mathieson

Guo

1992

British Phycological Journal

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“…Intrinsic properties such as energy reserves, photosynthetic capacity, and respiratory demand, as well as extrinsic environmental conditions, strongly influence the viability of the spores, and pre-determine their subsequent development (Santelices 1990;Amsler & Neushul 1991;Reed et al 1996). Periods of low temperature and light, presumably correlated with the presence of high environmental levels of nutrients, have been related to maximum production of spores in kelps (Novaczek 1984;Lee & Brinkhuis 1986;Kain 1989;Reed et al 1996). Growth of spores, gametophytes, and sporophytes obtained in different seasons of the year may have different requirements for light and temperature for their growth and development resulting more from a seasonal effect than from variability among plants ( Lee & Brinkhuis 1988).…”

Section: Discussionmentioning

confidence: 99%

Aspects of the reproductive phenology ofLessonia trabeculata(Laminariales: Phaeophyceae) from three populations in northern Chile

Tala

Edding

Vásquez

2004

New Zealand Journal of Marine and Freshwater Research

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Lessonia trabeculata is a brown seaweed inhabiting the rocky subtidal zone along the coast of central and northern Chile, where it is the dominant kelp, and an important species in community structure. Morphological and reproductive aspects of this alga are dependent on environmental conditions and geographic distribution, and the present study gives data on its reproductive periodicity. The reproductive phenology for three populations from northern Chile (29-30°S) was evaluated by means of seasonal examination of morphological and reproductive characteristics of both macroscopic sporophytes and microscopic gametophytes. Comparative laboratory cultures of spores were made to determine seasonal differences in their capacity to produce viable plants. This species is perennial, and demonstrates year-round presence of reproductive tissues, although showing variation in reproductive phenology over time and among populations. The size of blades increases in spring and summer, whereas its reproductive potential (e.g., area and proportion of the reproductive tissue and the release of spores) increases in autumn. Culture experiments showed that spring and summer reproductive tissue released zoospores which had low germination rates compared to those of autumn and winter, and which produced female gametophytes of low fertility. The population differences depended on the character analysed and the season of the year. The development of both phases of the life cycle of L. trabeculata may be influenced by the local environmental conditions and their seasonal changes, and were expressed as morphological and/ or reproductive changes in the plants. A better understanding of the seasonal adaptations may be obtained if future comparisons are made between widely separated populations or between individuals from the extremes of geographic distribution of the species.

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“…The ratios varied with time and locality. Novaczek (1984),using a n estimated 5 mg cm-2 as the dry weight of sporangia and accessory structures, calculated that fertile tissue constituted about 20 % of the yearly tissue production in Ecklonia radiata (C. Ag.)…”

Section: Discussionmentioning

confidence: 99%

Cost of reproduction in Fucus distichus

Ang¹

1992

Mar. Ecol. Prog. Ser.

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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.

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Development and phenology of Ecklonia radiata at two depths in Goat Island Bay, New Zealand

Cited by 67 publications

References 10 publications

Patterns of fucoid reproductive biomass allocation

Patterns of fucoid reproductive biomass allocation

Aspects of the reproductive phenology ofLessonia trabeculata(Laminariales: Phaeophyceae) from three populations in northern Chile

Cost of reproduction in Fucus distichus

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