Rapid Population Differentiation in a Mosaic Environment. II. Morphological Variation in Anthoxanthum odoratum

Evolution ◽  
1972 ◽  
Vol 26 (3) ◽  
pp. 390 ◽  
Author(s):  
R. W. Snaydon ◽  
M. S. Davies
Keyword(s):  
Morphological Variation ◽  
Population Differentiation ◽  
Anthoxanthum Odoratum

Morphological variation within and among six populations of Trillium erectum in southern Ontario

1987 ◽  
Vol 65 (11) ◽  
pp. 2450-2457 ◽  
Author(s):  
Gordon S. Ringius ◽  
Jerry G. Chmielewski
Keyword(s):  
Morphological Variation ◽  
Phenotypic Variation ◽  
Population Differentiation ◽  
Plant Size ◽  
Southern Ontario ◽  
General Symmetry ◽  
Precambrian Rocks ◽  
Aerial Shoot ◽  
Several Variables ◽  
Complex Relationships

Phenotypic variation within populations and among populations was examined in six populations of Trillium erectum from southern Ontario. The general symmetry of the flower was confirmed, although there was a tendency for the lower petals and sepals to be longer than the upper ones. Within populations, variation related to the overall expansion of the aerial shoot after emergence from the soil accounted for most of the variation. However, the expansion of the shoot was not uniform and independent growth components were found for the floral and vegetative variables. Only about one-third of the variation in floral variables was dependent on plant size. Also, within the flower, anthers, and filaments varied independently. Among-population differentiation was high and appeared to be determined by complex relationships among variables that are unique to each population. Several variables showed a correlation with underlying bedrock: populations located on Paleozoic limestone consist of plants that are smaller than those in populations located on Precambrian rocks. Whether the correlation between plant size and parental bedrock is causal is unknown.

Ceratozamia sanchezae (Zamiaceae): a new cycad species from Chiapas Highlands (Mexico)

Phytotaxa ◽  
2021 ◽  
Vol 500 (3) ◽  
pp. 201-216
Author(s):  
JOSÉ SAID GUTIÉRREZ-ORTEGA ◽  
MIGUEL A. PÉREZ-FARRERA ◽  
ANDREW P. VOVIDES ◽  
ANGÉLICA CHÁVEZ-CORTÁZAR ◽  
SERGIO LÓPEZ ◽  
...  
Keyword(s):  
Morphological Variation ◽  
Population Differentiation ◽  
Species Delimitation ◽  
Species Complex ◽  
Herbarium Specimens ◽  
New Taxon ◽  
Linear Discriminant ◽  
Discriminant Analyses ◽  
Male Cones ◽  
Adult Plants

The taxonomic classification within the Neotropical cycad genus Ceratozamia (Zamiaceae) has been a challenging task because cohorts of morphological variation in association with conspicuous geographic discontinuities that delimit species are not always easy to observe. Ceratozamia robusta is one example. Although previous studies have suggested that C. robusta presents an unusually high morphological variation across populations, this variation remains unquantified. In particular, we noticed that herbarium specimens from populations in the region Los Altos de Chiapas (Chiapas Highlands) that have been considered as C. robusta notably differ from the rest of the typical C. robusta forms by having narrower leaflets and fewer prickles on the petioles. Thus, we asked whether the populations in the Chiapas Highlands correspond to C. robusta as currently circumscribed. We examined the variation of ten leaf and trunk traits of 97 adult plants from six populations of C. robusta. Variation among the ten traits was significantly differentiated across populations, and such variation is correlated with elevation. Pairwise population differentiation tests and linear discriminant analyses clearly separated three groups: 1) populations similar to the neotype of C. robusta occur at mid-elevations in Chiapas, 2) a large C. robusta form occurs at low elevations in Belize, and 3) populations in the Chiapas Highlands that differ from both. The latter have fewer leaves and leaflets, shorter rachis, arched leaves in mature plants, petioles sparsely armed with thin prickles, smaller male cones, and juvenile forms more similar to those of the C. miqueliana species complex. These results suggest that the populations from the Chiapas Highlands represent a new taxon, here described as Ceratozamia sanchezae. This study highlights the importance of quantifying morphological variation across cycad populations to identify the species delimitation in complex groups.

scholarly journals Morphological Variation of Limnonectes blythii in West Sumatera, Indonesia

2018 ◽  
Vol 6 (08) ◽  
Author(s):  
Wince Hendri Hendri ◽  
Djong Hon Tjong ◽  
Dahelmi . ◽  
Dewi Imelda Roesma
Keyword(s):  
Genetic Variation ◽  
Morphological Variation ◽  
Population Differentiation ◽  
Phylogenetic Relationships ◽  
Nature Reserve ◽  
Morphological Characters ◽  
Natural Sciences ◽  
Significant Differentiation ◽  
Morphological Variations ◽  
West Sumatra

Abstract: This study aimed to analyze the morphological variations of Limnonectes blythii in West Sumatra by using morphometric in Genetics and Cytology Laboratory, Department of Biology, Faculty of Mathematics and Natural Sciences, Andalas University, Padang. The sample of this research was collected directly in West Pasaman (Nature Reserves Malampah), Sijunjung (Nature Reserve Pangean) and Payakumbuh (Harau Nature Reserve) in February until Mai 2015. The results showed that there is genetic variation in morphology of the population L. blythii in Malampah and Pangean as the first cluster with a population in Harau. The kinship between populations in Pangean and Malampah as the second cluster is closer to the population at second subcluster with Harau population and have the more distant kinship of the population L. blythii in Pangean. It was concluded that 12 morphological characters show differentiation significant (p≥ 0005) of the population, while the population of Harau and Sijunjung showed significant differentiation as many as 10 characters (32.2%), Between population differentiation Harau with Malampah show as much as 8 characters (25.8% ), and between population Malampah with Sijunjung show 7 (22:58%) differentiated character. This study requires molecular analysis to clarify the phylogenetic relationships among L. blythii to preserve the information of this frog as an export commodity.

Morphological variation inNepeta nuda L

1982 ◽  
Vol 93 (1-2) ◽  
pp. 71-76
Author(s):  
S. Kokkini ◽  
D. Babalonas
Keyword(s):  
Morphological Variation
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