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Can amphibians take the heat? Vulnerability to climate warming in subtropical and temperate larval amphibian communities
Predicting the biodiversity impacts of global warming implies that we know where and with what magnitude these impacts will be encountered. Amphibians are currently the most threatened vertebrates,…
Subterranean rodents of the genus Ctenomys (Caviomorpha, Ctenomyidae) follow the converse to Bergmann's rule
Tuco-tucos follow the converse to Bergmann's rule at the interspecific level, and the observed latitudinal body-size gradients are more probably related to seasonality, ambient energy, primary productivity and/or intensity of predation.
Bergmann's rule across the equator: a case study in Cerdocyon thous (Canidae).
- P. Martinez, D. A. Martí, W. Molina, C. Bidau
- Geography, MedicineThe Journal of animal ecology
- 1 September 2013
It is possible that the observed pattern - southern populations following Bergmann's rule while northern populations reflecting the opposite - has been influenced by the events that occurred during the LGM that could have led to the differentiation of populations.
Geographic distribution of Robertsonian fusions in Dichroplus pratensis (Melanoplinae, Acrididae): the central-marginal hypothesis reanalysed
A series of central and marginal populations which display typical features of each type and also, identify for the first time completely standard telocentric marginal populations at the southernmost and northernmost limits of the species distribution and show, as expected, the highest recombination indices.
Variability along a latitudinal gradient in the chiasma frequency and morphological characters of Dichroplus pratensis (Orthoptera: Acrididae)
The decrease in fusion polymorphism and the consequent increase in genetic recombination in the marginal areas, is a result of natural selection favouring higher levels of variability, which could be adaptive in ecologically harsher and changing environments.
Tracking the evolution of sex chromosome systems in Melanoplinae grasshoppers through chromosomal mapping of repetitive DNA sequences
- O. M. Palacios-Gimenez, Elio R D Castillo, D. A. Martí, D. C. Cabral-de-Mello
- Biology, MedicineBMC Evolutionary Biology
- 9 August 2013
This work used classical cytogenetic and FISH analyses to examine the repetitive DNA sequences in six phylogenetically related Melanoplinae species to suggest a common origin and subsequent differential accumulation of repetitive DNAs in the sex chromosomes of Dichromatos and an independent origin of the sex chromosome of the neo-XY and neo-X1X2Y systems.
Sex and Neo-Sex Chromosomes in Orthoptera: A Review*
The hypothesis that neo-sex chromosome systems produce favorable new linkage relationships between genes in the X and the involved autosome, some of which could be sex determination related, creating a new balance between sex chromosomes and autosomes is discussed.
B chromosomes and Robertsonian fusions of Dichroplus pratensis (Acrididae): intraspecific support for the centromeric drive theory
The centromeric drive theory of karyotypic evolution in the grasshopper Dichroplus pratensis is tested and logistic regression analysis revealed that B chromosomes are more probably found in populations with a higher proportion of acrocentric chromosomes, as the theory predicts.
Male and Female Meiosis in a Natural Population of Dichroplus Pratensis (Acrididae) Polymorphic for Robertsonian Translocations: A Study of Chiasma Frequency and Distribution
The results suggest that, in this species, Robertsonian translocations exert parallel effects on recombination in both sexes, and that, if there exist separate controls of recombination for males and females, these are overruled by the effects of the rearrangements, which, in turn, would control balanced orientation and segregation of trivalents and, thus, the maintenance of the polymorphisms in nature.
Contrasting patterns of sexual size dimorphism in the grasshoppers Dichroplus vittatus and D. pratensis (Acrididae, Melanoplinae)*
Analysis of populations of the grasshoppers Dichroplus vittatus and D. pratensis in Argentina found that SSD occurs in both species across their geographical distribution ranges, also involving differences in allometry and shorter developmental times in males.