scholarly journals Growth rates and photon yield of growth in natural populations of a marine macroalga Ulva lactuca

1992 ◽  
Vol 81 ◽  
pp. 179-183 ◽  
Author(s):  
O Geertz-Hansen ◽  
K Sand-Jensen
Keyword(s):  
Growth Rates ◽  
Natural Populations ◽  
Ulva Lactuca ◽  
Photon Yield ◽  
Marine Macroalga

Temporal Changes of the Epiphytic Bacteria Community From the Marine Macroalga Ulva lactuca (Santa Marta, Colombian-Caribbean)

2021 ◽  
Author(s):  
Natalia Beatriz Comba González ◽  
Albert Nicolás Niño Corredor ◽  
Liliana López Kleine ◽  
Dolly Montoya Castaño
Keyword(s):  
Temporal Changes ◽  
Ulva Lactuca ◽  
Epiphytic Bacteria ◽  
Marine Macroalga

Hybridization in leopard frogs (Rana pipiens complex): terrestrial performance of newly metamorphosed hybrid and parental genotypes in field enclosures

2001 ◽  
Vol 79 (9) ◽  
pp. 1552-1558 ◽  
Author(s):  
Matthew J Parris
Keyword(s):  
Growth Rates ◽  
Life Histories ◽  
Parental Species ◽  
Natural Populations ◽  
Life Cycles ◽  
Natural Hybridization ◽  
Evolutionary Potential ◽  
Leopard Frogs ◽  
Rana Blairi ◽  
Advanced Generation

Terrestrial ecology has been largely neglected in the study of amphibian life histories because it is difficult to manipulate most species during the terrestrial stage. I examined the terrestrial performance of Rana blairi, Rana sphenocephala, and four hybrid (two F1 and two advanced generation) genotypes in replicated experimental enclosures to test for differences in traits related to juvenile terrestrial fitness. I produced all genotypes by means of artificial fertilizations using frogs collected from natural populations in central Missouri, and juvenile frogs were obtained from larvae reared in experimental ponds. Following metamorphosis, froglets were raised in single-genotype groups in terrestrial enclosures through the first overwintering. The proportion surviving did not vary among genotypes, but the power to detect significant differences was low. F1 hybrid genotypes BS and SB demonstrated significantly higher growth rates than either parental species or advanced-generation hybrid genotypes. Observation of growth rates of advanced-generation hybrids equal to those of the parental species, and heterosis in F1 hybrids for growth rate, suggests that natural hybridization between R. blairi and R. sphenocephala can produce novel and relatively fit hybrid genotypes. Direct measurement of multiple fitness components for hybrid and parental genotypes is critical for assessing the evolutionary potential of natural hybridization in organisms with complex life cycles.

Sex expression and growth rates in natural populations of the desert soil crustal mossSyntrichia caninervis

1998 ◽  
Vol 40 (4) ◽  
pp. 401-416 ◽  
Author(s):  
Lloyd R. Stark ◽  
Brent D. Mishler ◽  
D.Nicholas McLetchie
Keyword(s):  
Growth Rates ◽  
Natural Populations ◽  
Sex Expression ◽  
Desert Soil

Effects of Five Antifouling Biocides on Settlement and Growth of Zoospores from the Marine Macroalga Ulva lactuca L.

2013 ◽  
Vol 91 (4) ◽  
pp. 426-432 ◽  
Author(s):  
Ida Wendt ◽  
Åsa Arrhenius ◽  
Thomas Backhaus ◽  
Annelie Hilvarsson ◽  
Kristina Holm ◽  
...  
Keyword(s):  
Ulva Lactuca ◽  
Antifouling Biocides ◽  
Marine Macroalga

Interactions of silver nanoparticles with the marine macroalga, Ulva lactuca

Ecotoxicology ◽  
2011 ◽  
Vol 21 (1) ◽  
pp. 148-154 ◽  
Author(s):  
Andrew Turner ◽  
David Brice ◽  
Murray T. Brown
Keyword(s):  
Silver Nanoparticles ◽  
Ulva Lactuca ◽  
Marine Macroalga

Uptake of platinum group elements by the marine macroalga, Ulva lactuca

2007 ◽  
Vol 105 (3-4) ◽  
pp. 271-280 ◽  
Author(s):  
Andrew Turner ◽  
Marie S. Lewis ◽  
Leyla Shams ◽  
Murray T. Brown
Keyword(s):  
Platinum Group Elements ◽  
Ulva Lactuca ◽  
Platinum Group ◽  
Marine Macroalga

Growth dynamics in natural populations of Sphaeriidae clams (Sphaerium, Musculium, Pisidium)

1979 ◽  
Vol 57 (2) ◽  
pp. 441-456 ◽  
Author(s):  
G. L. Mackie
Keyword(s):  
Growth Rates ◽  
Larval Growth ◽  
Natural Populations ◽  
Growth Dynamics ◽  
Logarithmic Phase ◽  
River Population ◽  
Small Litter ◽  
Larval Stages ◽  
Permanent Pond ◽  
Accelerated Growth

Analyses of life history samples of five species of sphaeriid clams collected at least monthly for 1 year from 10 different habitats show that growth of all larval stages stops when parents cease to grow. During the logarithmic phase of growth larvae grow slower than parents in temporary and permanent pond populations of Musculium lacustre, Pisidium casertanum, and Pisidium variabile, as fast as parents in a river population of Sphaerium fabale, and as fast or faster than parents in five populations of Musculium securis. Species with slow larval growth rates are usually semelparous and univoltine but can be iteroparous by precocious birth of larvae and multivoltine by accelerated growth of semelparous individuals. Species with rapid larval growth rates are usually iteroparous because larvae grow faster than parents and (or) there is precocious birth of larvae. There is greater mortality of larvae during early stages than during later stages of larval development. The greatest numbers of larvae per parent usually occur in early winter and (or) late spring; winter and summer 'kills' often result in small litter sizes.

Field validation of an instantaneous estimate of in situ development and growth for marine copepod communities

2006 ◽  
Vol 63 (12) ◽  
pp. 2639-2647 ◽  
Author(s):  
Akash R Sastri ◽  
John F Dower
Keyword(s):  
Growth Rates ◽  
Natural Populations ◽  
Field Validation ◽  
Marine Copepod ◽  
Marine Zooplankton ◽  
Coastal British Columbia ◽  
Individual Body ◽  
Good Agreement ◽  
Marine Copepods

To date, efforts to develop a method for rapidly measuring the development and growth rates of marine zooplankton have met with little success. In recent years, however, a simple assay based on a crustacean moulting enzyme, chitobiase, has shown considerable promise. Previous laboratory studies have demonstrated that chitobiase activity is proportional to individual body size across three species of freshwater daphnids. Here, we show that a significant positive relationship exists between chitobiase activity and body length (and weight) across four species of marine copepods collected from natural populations in coastal British Columbia, Canada. We measured the decay rate of chitobiase in the water column and estimated in situ moulting and growth rates of the entire copepod community, which are in good agreement (5%–15%) with conventional moulting rates and literature-based estimates. This method can be applied at a relatively high spatial and temporal resolution and its utility is potentially analogous to conventional community-wide productivity estimates for phytoplankton and bacterioplankton in marine and freshwater systems.

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