SEX RATIO VARIATION IN THE LESSONIA NIGRESCENS COMPLEX (LAMINARIALES, PHAEOPHYCEAE): EFFECT OF LATITUDE, TEMPERATURE, AND MARGINALITY 1

@article{ValeriaOppliger2011SEXRV,
  title={SEX RATIO VARIATION IN THE LESSONIA NIGRESCENS COMPLEX (LAMINARIALES, PHAEOPHYCEAE): EFFECT OF LATITUDE, TEMPERATURE, AND MARGINALITY 1},
  author={Luz Valeria Oppliger and Juan A. Correa and Sylvain Faugeron and Jessica Beltr{\'a}n and Florence Tellier and Myriam Valero and Christophe Destombe},
  journal={Journal of Phycology},
  year={2011},
  volume={47}
}
Little is known about variation of sex ratio, the proportion of males to females, in natural populations of seaweed, though it is a major determinant of the mating system. The observation of sexual chromosomes in kelps suggested that sex is partly genetically determined. However, it is probably not purely genetic since the sex ratio can be modified by environmental factors such as salinity or temperature. In this paper, sex ratio variation was studied in the kelp Lessonia nigrescens Bory… Expand
THE LESSONIA NIGRESCENS SPECIES COMPLEX (LAMINARIALES, PHAEOPHYCEAE) SHOWS STRICT PARAPATRY AND COMPLETE REPRODUCTIVE ISOLATION IN A SECONDARY CONTACT ZONE 1
TLDR
It is demonstrated that the two species were strictly segregated in space, indicating complete reproductive isolation in natural conditions, and raising new interesting questions as to the mechanisms that limit sympatry at small spatial scales. Expand
Species separation within the Lessonia nigrescens complex (Phaeophyceae, Laminariales) is mirrored by ecophysiological traits
TLDR
Phlorotannins, pigments and Chl a fluorescence of PSII were most crucial for species-specific adaptations at the respective growth sites, whereas changes in total lipids and fatty acid compositions were negligible, which may help to predict kelp responses towards future environmental changes. Expand
Temperature Effects on Gametophyte Life-History Traits and Geographic Distribution of Two Cryptic Kelp Species
TLDR
The critical role of the haploid microscopic stage (gametophyte) of the life cycle is emphasized to explain the difference of edge distribution of two related kelp species and show local adaptation of thelife cycle at the range limits of the distribution. Expand
Correction: Temperature Effects on Gametophyte Life-History Traits and Geographic Distribution of Two Cryptic Kelp Species
A major determinant of the geographic distribution of a species is expected to be its physiological response to changing abiotic variables over its range. The range of a species often corresponds toExpand
Temperature effects on the microscopic haploid stage development of Laminaria ochroleuca and Sacchoriza polyschides , kelps with contrasting life histories
TLDR
The microscopic stage of the annual Saccorhiza polyschides had a significant advantage in fitness compared to the perennial L. ochroleuca in this study, suggesting this annual opportunistic species may out compete this perennial species in areas where they share habitat. Expand
Effects of temperature and salinity on the reproductive phases of Macrocystis pyrifera (L.) C. Agardh (Phaeophyceae) in the Magellan region
The region of Magallanes has the world’s largest sub-Antarctic environments, including the heterogeneous habitats of archipelagos, fjords, channels, and inlets formed by ice advancing and retreatingExpand
Populations of a New Morphotype of Corrugate Lessonia Bory in the Beagle Channel, Sub-Antarctic Magellanic Ecoregion: A Possible Case of On-Going Speciation
ABSTRACT During a 2007 expedition dedicated to study kelp diversity within the Magellanic region, specimens of Lessonia Bory with corrugate, yellowish blades were found along the Beagle Channel. ThisExpand
Mates Matter: Gametophyte Kinship Recognition and Inbreeding in the Giant Kelp, Macrocystis pyrifera (Laminariales, Phaeophyceae)
TLDR
Investigating the effects of male–female kinship on female fecundity and fertility in Macrocystis pyrifera revealed that females left alone or in the presence of sibling males express the highest gametophyte size, number, and size of oogonia, suggesting they were able to sense the presence and the identity of their mates before gamete contact. Expand
Temperature Modulates Sex-Biased Gene Expression in the Gametophytes of the Kelp Saccharina latissima
TLDR
Temperature modulated sex-biased gene expression, with only a small percentage of differentially expressed genes consistently male or female-biased at the three temperatures, suggests that males are more heat tolerant than females. Expand
Temperature dependent sex-biased gene expression in the gametophytes of the kelp Saccharina latissima
TLDR
The transcriptomic basis for sexual dimorphism and associated metabolic needs are described for the kelp Saccharina latissima and temperature modulates sex-biased gene expression resulting in a stronger stress response in females. Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 59 REFERENCES
Parthenogenesis in the brown alga Lessonia nigrescens (Laminariales, Phaeophyceae) from central Chile 1*
TLDR
Quantification of DNA of various tissues demonstrated that early during their development, parthenosporophytes duplicated their DNA content, displaying levels similar to heterozygous sporophytes and almost twice the level found in gametophytes. Expand
Latitudinal Differences in Thermal Tolerance among Microscopic Sporophytes of the Kelp Lessonia nigrescens ( phaeophyta : Laminariales )
The strong temperature increase during the 1982/1983 El Nino event caused local extinction of many species in large coastal zones of northern Chile and Peru. One brown algal species affected byExpand
Latitudinal Differences in Thermal Tolerance among Microscopic Sporophytes of the Kelp Lessonia nigrescens (Phaeophyta: Laminariales)
TLDR
Comparisons of thermal tolerance in the microscopic progeny from plants of the three Chilean localities showed that, at higher incubation temperatures, central and northern thermal ecotypes do have higher survival and growth rates than the ecotypes from the south. Expand
Environmental sex determination in response to light and biased sex ratios in Equisetum gametophytes
TLDR
It is concluded that environmental sex determination in response to light cannot alone account for the female bias in natural populations of Equisetum gametophytes. Expand
Life history and growth in culture of the endemic New Zealand kelp Lessonia variegata J. Agardh in response to differing regimes of temperature, photoperiod and light
  • W. Nelson
  • Biology
  • Journal of Applied Phycology
  • 2005
TLDR
This is the first account of the growth in culture and life history of L. variegata, endemic to New Zealand, where it occurs in subtidal kelp forests on wave exposed coasts in the North, South and Stewart Islands. Expand
Microsatellite (GATA)n reveals sex-specific differences in Papaya
TLDR
This study indicates that the genetic material of the X and Y chromosomes of papaya is diverging in a sex-specific manner and hence they are in the process of differentiation. Expand
RECOVERY AND GENETIC DIVERSITY OF THE INTERTIDAL KELP LESSONIA NIGRESCENS (PHAEOPHYCEAE) 20 YEARS AFTER EL NIÑO 1982/831
TLDR
It is shown, effectively, that northward re‐colonization advanced less than 60 km in 20 years, whereas kelp beds of the Northern Hemisphere recovered 300 km in only six months after the same ENSO event. Expand
Conservation and polymorphism of mitochondrial intergenic sequences in brown algae (Phaeophyceae)
TLDR
It is argued that these intergenic spacer loci are highly efficient markers for within-family phylogenetic studies and for intra-specific phylogeographic studies in brown seaweeds. Expand
Evolution of an Expanded Sex-Determining Locus in Volvox
Revealing Volvox Female and male gametes of the green alga, Volvox, significantly differ in size. Those of Chlamydomonas, another green algae from a lineage that separated from Volvox some 200Expand
Disentangling genetic vs. environmental causes of sex determination in the common frog, Rana temporaria
TLDR
Results report results of studies shedding light on the sex determination system and sex ratio variation in this species, finding a microsatellite locus RtSB03 was found to be sex-linked in four geographically disparate populations, suggesting male heterogamy in common frogs. Expand
...
1
2
3
4
5
...