Meristic and Morphometric Variation between the Endangered Acadian Whitefish, Coregonus huntsmani, and the Lake Whitefish, Coregonus clupeaformis, in the Canadian Maritime Provinces and the State of Maine, USA

1991 ◽  
Vol 48 (11) ◽  
pp. 2140-2151 ◽  
Author(s):  
Thomas A. Edge ◽  
Don E. McAllister ◽  
Sami U. Qadri
Keyword(s):  
Morphological Variation ◽  
Morphological Characteristics ◽  
Principal Component ◽  
The State ◽  
Coregonus Clupeaformis ◽  
Lake Whitefish ◽  
Maritime Provinces ◽  
Morphometric Variation ◽  
Morphometric Characters ◽  
Adipose Fin

Principal component and discriminant function analyses of morphological variation between whitefish populations from the Canadian Maritime Provinces and the State of Maine, USA, clearly distinguished the Acadian whitefish, Coregonus huntsmani, from the lake whitefish species complex, Coregonus clupeaformis. Ten meristic and 44 morphometric characters were examined and the species were best discriminated by number of vertebrae (>97% separation) and mouth shape. Acadian whitefish had a terminal mouth and 64–67 [Formula: see text] vertebrae, while lake whitefish had a subterminal mouth and 58–64 [Formula: see text] vertebrae. Acadian whitefish were also characterized by having more lateral line scales (88–100, [Formula: see text] than lake whitefish (63–95, [Formula: see text], a shorter adipose to caudal fin length, a smaller adipose fin, and a longer pelvic axillary process than lake whitefish. Considerable morphological variation was found between lake whitefish populations examined although there was no morphological basis to recognize any lake whitefish population as taxonomically distinct. The Acadian whitefish has morphological characteristics of both subgenera Leucichthys and Coregonus; it could be important for understanding the evolution of coregonine fishes and its imminent extinction would represent a serious loss of genetic diversity.

Distribution of the dwarf dog-faced bat Molossops temminckii (Chiroptera: Molossidae) in Colombia and comments on its morphometry

Mammalia ◽  
2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Julio J. Chacón-Pacheco ◽  
Luis José Avendaño Maldonado ◽  
Carlos Agamez-López ◽  
Ingrith Yuliany Mejía-Fontecha ◽  
Daniela Velásquez-Guarín ◽  
...  
Keyword(s):  
South America ◽  
Morphological Variation ◽  
Principal Component ◽  
The Other ◽  
Cryptic Diversity ◽  
Vocal Plasticity ◽  
Morphometric Variation ◽  
Integrative Analyses ◽  
Principal Component Analyses

AbstractThe genus Molossops includes two species that are restricted to South America: Molossops neglectus and Molossops temminckii. The smaller dog-faced dwarf Molossops temminckii is distributed from Colombia to Argentina and has a wide morphological variation and vocal plasticity. In Colombia, this species remains poorly known. To fill distributional gaps, we present novel records from Arauca, Atlántico, Bolívar, Córdoba, and Huila departments. We also present an analysis of the morphometric variation in South America using Principal Component Analyses. These show an external and cranial difference of specimens of Colombia in respect of other and South America populations. In Colombian landscapes dominated by the floodplain savanna of the Orinoco region, Molossops temminckii is smaller than in the other regions of the country, and the previously suggested existence of cryptic diversity within the taxon should be evaluated. Therefore, we suggest further integrative analyses to investigate a possible subspecific status of some Colombian populations.

Genetic and Morphological Differentiation between Dwarf and Normal Size Forms of Lake Whitefish (Coregonus clupeafotmis) in Como Lake, Ontario

1993 ◽  
Vol 50 (1) ◽  
pp. 210-216 ◽  
Author(s):  
J. A. Vuorinen ◽  
R. A. Bodaly ◽  
J. D. Reist ◽  
L. Bernatchez ◽  
J. J. Dodson
Keyword(s):  
Morphological Characteristics ◽  
Morphological Differentiation ◽  
Principal Component ◽  
Lake Ontario ◽  
Glacial Refugia ◽  
Lake Whitefish ◽  
Sympatric Populations ◽  
Allopatric Divergence ◽  
Significant Difference ◽  
Morphological Differences

Normal and dwarf size forms of lake whitefish (Coregonus clupeaformis) from Como Lake, Ontario, were sampled at spawning time and examined for differences in electrophoretic, mtDNA, and morphological characteristics to test the hypothesis of reproductive isolation and provide clues regarding evolutionary origin. Of the 36 enzyme loci examined, 33 were fixed for the same alleles in both dwarf and normal lake whitefish. At the three polymorphic loci, allele frequencies were not statistically different between dwarfs and normals. mtDNA analysis revealed five different haplotypes. The same mtDNA haplotype was the most common in both dwarf and normal lake whitefish, but there was a statistically significant difference in haplotype frequencies between the two size forms. Discriminant and principal component analyses demonstrated highly significant morphological differences between dwarfs and normals. Because the two size morphs spawn in the same place at the same time, it is most likely that genetic differences, not different rearing environments, underly the observed morphological differences. mtDNA haplotypes derived from both the Mississippi and Atlantic glacial refugia are present in Como Lake lake whitefish, raising the possibility of an allopatric divergence for the two forms; however, this hypothesis requires testing by genetic comparisons of other sympatric populations in Ontario.

scholarly journals Identification of morphometric variation of Aegel marmelos (L.) Correa correlated with habitat types in Western Terai

2021 ◽  
Vol 1 (1) ◽  
pp. 01-017
Author(s):  
Bimal Bahadur Kunwar
Keyword(s):  
Principal Component ◽  
Morphological Characters ◽  
Habitat Types ◽  
Morphometric Traits ◽  
Morphometric Variation ◽  
Morphometric Characters ◽  
Grouping Pattern ◽  
And Cluster Analysis ◽  
Disc Level ◽  
East West

Aegle marmelos (L.) Correa locally called “Bael” is an economically important plant mainly harvested and traded for medicinal as well as religious purposes. Most of the collection of the plant is from forest. Due to habitat change, deforestation and over harvesting, it is feared that such important plant and its precious genetic diversity may be lost from the nature. Responding to these challenges a major initiative has been launched in the Western Terai Landscape Complex of Nepal to identify morphometric variability in A. marmelos. Morphometric characters variation of this species in Western Terai Landscape Complex was statically and numerically evaluated. Sixteen populations were analysed, using 27 morphological characters of leaves and fruit, collected during 2007/2008 naturally. Most of the morphological characters were not significant with the east-west longitudinal gradient except few were, probably because of small gradient. The variation in the A. marmelos is clearly verified by uni- and multivariate statistics. Highest variation was observed in the (DL) Disc Level (CV= 6.08) from different morphometric characters and later that in PL and B. These DL, PL and B were determining characters of morphometric variation. Similarly, principal component and cluster analysis through forming dendrogram of morphometric traits indicated different grouping pattern of populations. The populations that are nearer to each other are not cluster together. At different sites of sampling analysis of variance in the morphometric traits revealed remarkable variation among population.

scholarly journals Morphometric variation of the horseshoe crab Tachypleus gigas (Xiphosura: Limulidae) from the Banyuasin estuarine of South Sumatra, Indonesia

2021 ◽  
Vol 22 (11) ◽  
Author(s):  
Fauziyah FAUZIYAH ◽  
APON Z. MUSTOPA ◽  
FATIMAH FATIMAH ◽  
ANNA I. S. PURWIYANTO ◽  
ROZIRWAN ROZIRWAN ◽  
...  
Keyword(s):  
Horseshoe Crab ◽  
Stock Assessment ◽  
Function Analysis ◽  
Principal Component ◽  
Growth Patterns ◽  
The Body ◽  
Morphometric Variation ◽  
Morphometric Characters ◽  
Morphological Studies ◽  
Significant Difference

Abstract. Fauziyah, Mustopa AZ, Fatimah, Purwiyanto AIS, Rozirwan, Agustriani F, Putri WAE. 2021. Morphometric variation of the horseshoe crab Tachypleus gigas (Xiphosura: Limulidae) from the Banyuasin estuarine of South Sumatra, Indonesia. Biodiversitas 22: 5061-5070. Morphological studies are essential for fish resource management, ecology, conservation, and stock assessment. This research was conducted to characterize the morphological variation of the coastal horseshoe crab (Tachypleus gigas) from the Banyuasin estuarine, South Sumatra, Indonesia. The body weight (BW), prosoma width (PW), carapace length (CL), telson length (TEL), and total length (TL) were measured for describing the morphometric variability of T. gigas. A total of 70 T. gigas (32 females and 38 males) were found using trammel net fishing and bottom gillnet during the survey. Multivariate and allometric methods analyzed their morphometric characters. Based on Kruskal- Wallis tests, the result showed a significant difference in somebody measurements (TL and CL) between males and females. The principal component analysis (PCA) results showed that all morphometric characters had a strong correlation in both sexes, so the first principal component (PC1) values were 92% and 72%. In comparison, the second principal component (PC2) values were 5% and 20% in females and males, respectively. The results of discriminant function analysis (DFA) suggested that only one (BW) of the five morphometric characters was significant in separating both sexes. Both sexes were also revealed variations in growth patterns based on the allometric analysis results. These results were expected to be used as a basis for managing the horseshoe crab population-based conservation.

scholarly journals Taxonomic revision of the genus Elmomorphus Sharp, 1888 I. Japanese and Korean species (Coleoptera: Dryopidae)

2021 ◽  
Vol 758 ◽  
Author(s):  
Ján Kodada ◽  
Dávid Selnekovič ◽  
Manfred A. Jäch ◽  
Katarína Goffová ◽  
Peter Vďačný
Keyword(s):  
Mitochondrial Gene ◽  
Principal Component ◽  
Taxonomic Revision ◽  
Morphological Characters ◽  
Molecular Data ◽  
Morphological Evidence ◽  
Morphometric Variation ◽  
Morphometric Characters ◽  
Gene Coding ◽  
Interspecific Divergence

The species of Elmomorphus Sharp, 1888 occurring in Japan and Korea are redescribed and illustrated: E. brevicornis Sharp, 1888 (Japan, Korea) and E. amamiensis Nomura, 1959 (Japan). The standard barcoding fragment of the mitochondrial gene coding for cytochrome c oxidase subunit I (COI) was sequenced and used together with morphological characters to delimit the taxonomic boundaries of the two species. To assess their morphometric variation, eight morphometric characters were measured and statistically evaluated using principal component analysis. The two species of Elmomorphus formed distinct and well-separated clusters in the COI tree. Their interspecific divergence is very high, ranging from 22.7 to 23.9%. On the other hand, morphometric characters, including those previously presumed to be diagnostic, overlap and per se do not allow unambiguous species identification. Reliable morphological distinguishing characters are described for males and females. Molecular data along with the morphological evidence strongly confirm the species status of E. amamiensis. An identification key to the Japanese and Korean species is provided.

Thermal dependence of size-at-hatch in the lake whitefish (Coregonus clupeaformis)

2019 ◽  
Vol 76 (11) ◽  
pp. 2069-2079 ◽  
Author(s):  
Charles Mitz ◽  
Christopher Thome ◽  
Mary Ellen Cybulski ◽  
Christopher M. Somers ◽  
Richard G. Manzon ◽  
...  
Keyword(s):  
Developmental Stages ◽  
Morphological Characteristics ◽  
Development Stage ◽  
Dominant Factor ◽  
Coregonus Clupeaformis ◽  
Lake Whitefish ◽  
Thermal Dependence ◽  
Break Up ◽  
The Difference ◽  
Incubation Temperatures

Lake whitefish (Coregonus clupeaformis) embryos incubated at low temperatures have a longer incubation period and hatch at a significantly greater size than those incubated at warmer temperatures. We examined hatch timing and morphological characteristics for whitefish embryos reared under different constant and varying temperatures to determine whether the thermal dependence of hatching size reflects differences in their development stage. Our results show that lake whitefish embryos hatch at different temperature-dependent developmental stages, and this is the dominant factor affecting size-at-hatch. The term “heterograde” is proposed for the thermal dependence of hatching stage to differentiate it from hatching that occurs at a fixed developmental stage. A method to quantify this effect is given using a ratio that describes the difference in relative development at hatching between different viable constant incubation temperatures. Heterograde hatching is proposed as a possible mechanism to synchronize the timing of hatch to the break-up of winter ice cover despite variability in the date of spawning and in the onset of spring break-up.

Land-Mark based morphometric and meristic variations in two congeneric hilsha population, Tenualosa ilisha and Tenualosa toli from Bangladesh water bodies

2020 ◽  
Vol 6 (2) ◽  
pp. 265-282
Author(s):  
Mithun Das ◽  
Md Mahiuddin Zahangir ◽  
Fatema Akhter ◽  
Md Main Uddin Mamun ◽  
Md Moudud Islam
Keyword(s):  
Function Analysis ◽  
Morphological Characteristics ◽  
Morphological Differentiation ◽  
Principal Component ◽  
Meristic Characters ◽  
Morphometric Measurements ◽  
Network Measurements ◽  
Morphometric Characters ◽  
Marine Population ◽  
Tenualosa Ilisha

The morphometric characters are effectively used for the better differentiation among the fish population and sustainable management. The appraisal of the natural population stock and morphological variation within and between two hilsha species (Tenualosa ilisha and Tenualosa toli) from three different habitat (Coastal, riverine and marine) of Bangladesh, were investigated by applying the land mark based morphometric and meristic variation measurement methods. All data were adjusted and Univariate ANOVA, where discriminant function analysis (DFA) and principal component analysis (PCA) exhibited the divergences in eight morphometric measurements and eight truss network measurements among the three stocks of T. ilisha. The 1st DFA accounted for 89.8% & 87.4% and the second DFA resolved 10.2% and 12.6%, respectively in morphometric characteristics variation among the group studied. Scattered plotting from PCA and dendogram from cluster analysis (CA) revealed that, the river habitants were morphologically different from the coastal and marine population. Twelve of fifteen morphometric measurements and thirteen of fourteen truss network measurements showed significant differences between T. ilisha and T. toil with significant variation in meristic characters. PCA revealed 89.23% and 88.29% in case of morphometric and truss measurement respectively confirmed high degree of variations in morphological characteristics between two species. Overall, our results based on morphometrics with truss measurements together provide useful information about the morphological differentiation which will be helpful for sustainable exploration and effective management for these two species. Asian J. Med. Biol. Res. June 2020, 6(2): 265-282

scholarly journals Karakterisasi Morfologi Ikan Bujuk (Channa lucius) pada Perairan Danau Singkarak Sumatera Barat, Rawa Banjiran Tanjung Jabung Timur Jambi dan Rawa Banjiran Kampar Riau

2014 ◽  
Vol 15 (1) ◽  
pp. 1 ◽  
Author(s):  
Azrita Azrita ◽  
Hafrijal Syandri ◽  
Dahelmi Dahelmi ◽  
Syaifullah Syaifullah ◽  
Estu Nugroho
Keyword(s):  
Principal Component Analysis ◽  
Morphological Characteristics ◽  
Principal Component ◽  
Environmental Water ◽  
Component Analysis ◽  
The Body ◽  
Meristic Characters ◽  
Morphometric Characters ◽  
A Value

Overfishing, the use of unfriendly-environmental fishing gears, changes of environmental water conditions and diversity of habitats are threaten the continuity of Bujuk fish (Channa lucius) and generate the morphologycal diversity. Consequently, appropriate conservation efforts are needed to preserve the fish. The first phase of these efforts were done through morphological approach. The research was held in 2010 in Singkarak Lake West Sumatera Province, in floodplain, Pematang sub-district Lindung Mendahara Ulu Regency East Tanjung Jabung, Province of Jambi, and in floodplain Mentulik Regency Kampar Kiri Hilir Riau Province. The aims of the research were to analyze the morphological characteristic of the fish with Principal Component Analysis (PCA) and to determine the range of similarity between populations of the fish. Determination of the location of fish sampling was conducted by proposive sampling in which there were 30 samples for every research location. The measurement of the specimen was done by digital calipers on the left of the body, at 4 meristic characters and 19 morphometric characters. The data obtained were analyzed by One Way ANOVA and principal component analysis using Statistical software version 13. The results showed that based on the analysis of morphological characteristics of bujuk fish, populations that exist in Lake Singkarak were different from those of Pematang Lindung floodplain sub-district Mendahara Ulu Regency East Tanjung Jabung Jambi Province and Mentulik Regency floodplain Kampar Kiri Hilir Province Riau. The meristic difference was on the number of scales along the lateral line with a value of 0.783. While the main difference on morphometric characters were the snout length with a value of 0.848, and length of upper jaw with a value of 0.847. Thus, the study showed that the fish was isolated geographically into two groups, which were Jambi-Riau population and Singkarak Lake population.

scholarly journals Quantifying the Geometric Shell Shape between Populations of True Limpets Lottia Mesoleuca (Mollusca: Lottidae) in Colombia

Animals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 675
Author(s):  
Ana María Echeverry ◽  
Edgardo Londoño-Cruz ◽  
Hugo A. Benítez
Keyword(s):  
Geometric Morphometrics ◽  
Morphological Characteristics ◽  
Structural Complexity ◽  
Principal Component ◽  
Morphological Diversity ◽  
Shell Shape ◽  
Ecological Processes ◽  
Morphometric Variation ◽  
Morphological Studies ◽  
Different Populations

The increasing activity in morphological studies has provided new tools to analyses the shape quantitatively, these quantitative measurements allow the researcher to examine the variation in shape and perform analysis to examine the quantitative differences among the species shapes, where geometric morphometrics has rendered great results in the last years. This study was focused on assessing the morphometric variation between populations of Lottia mesoleuca of the family Lottidae, an abundant group of gastropods in the rocky ecosystems of Bahía Málaga and Isla Gorgona (Colombian Pacific). This family has a high morphological diversity, making the identification of some morphotypes problematic work. Geometric morphometrics methods were applied on the shell using dorsal, lateral and ventral views. Different multivariate analyses were performed to differentiate the groups of species and populations (principal component analysis, morphological distances comparisons and grouping analysis by means of the Ward method). The results indicate that individuals of the species Lottia mesoleuca have key geometric characteristics associated to the different populations (depth intertidal zones) for classification, being the geometric shape of the shell enough to determine morphotypes between the different populations studied. Aspects associated with the combination of ecological variables with morphometric ones are necessary to be able to visualize with a higher resolution the structural complexity of populations and their adaptation processes. Furthermore, it is obvious that there is a strong need to conduct more explorations of environmental and ecological processes that provide some insight on why the morphological characteristics are so variable in the same species.

Morphometric variation within and between populations of the pine aphid, Cinara nigra (Wilson) (Homoptera: Aphidoidea: Lachnidae), in western North America

1990 ◽  
Vol 68 (7) ◽  
pp. 1410-1419 ◽  
Author(s):  
R. G. Foottit ◽  
M. Mackauer
Keyword(s):  
North America ◽  
Morphological Variation ◽  
Pinus Contorta ◽  
Principal Component ◽  
Significant Loss ◽  
Population Variation ◽  
Species Discrimination ◽  
Western North America ◽  
Shape Variation ◽  
Morphometric Variation

Morphological variation in Cinara nigra (Wilson), found on Pinus contorta Dougl. ex Loud, throughout western North America, was characterized with the aid of univariate and multivariate statistical methods. Within-population variation in one sample collected near Edson, Alberta, was examined. Correlation and principal component analysis revealed patterns of interdependence among characters as well as patterns of size and size-related shape variation in 52 characters. To examine morphological variation between 19 geographic samples, this initial set was reduced in two steps to 49 and 32 characters, respectively; the reduction did not result in a significant loss of information content. No geographic pattern in clusters of samples was revealed either by the ordination of sample centroids or by UPGMA cluster analysis of the Mahalanobis D values. The taxonomic implications of this morphometric analysis are discussed, in particular the usefulness of various morphological attributes for species discrimination.

Sign in / Sign up

Export Citation Format

Share Document