Morphological variation between red mullet populations in Greece
Morphometric variation in 15 characters of the red mullet Mullus barbatus samples from seven Greek localities was examined using multivariate analysis. ANOVA, stepwise discriminant analysis and cluster analysis revealed a rather high morphological variability between the populations studied. The discriminant analysis revealed that about 80% of the examined fish could be correctly classified into the seven areas. This variability could be explained in terms of genetic structuring of the populations and/or environmental conditions prevailing in each geographic area in combination with fish migration and egg/larvae transportation from one area to another. The results suggest that multivariate analysis when combined with other important biological parameters of red mullet may have important implications for the management of the Greek demersal fish resources.
Available from: Fabiana C. Félix-Hackradt
- "Stripped red mullet (Mullus surmuletus, Linnaeus, 1758) and red mullet (Mullus barbatus, Linnaeus, 1758) are distributed in the Eastern Atlantic Sea from North Sea to Senegal as well as throughout the Mediterranean and Black seas (Whitehead et al., 1986). Both are demersal fishes and share very similar biological characteristics (Mamuris et al., 1998); both species spawn in spring, and their larvae and juveniles are pelagic. Notwithstanding, they differ in their habitat preference: while M. surmuletus is mostly found on rough bottoms, M. barbatus instead prefers sandy or/and muddy habitats (Tserpes et al., 2002). "
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ABSTRACT: Population connectivity scales are important tools to achieve a mechanistic understanding of the factors regulating the abundance and distribution of marine populations and therefore support conservation actions to manage fisheries and stocks. We used 10 microsatellites markers on mullets' samples across the Spanish coast to determine the spatial scale of gene flow as well as the origin of post-larvae caught inside two MPAs. Population structure varied from complete homogeneity for Mullus barbatus, to high spatial variability in Mullus surmuletus samples. Differential habitat utilization by species, geomorphological features and oceanographic patterns are discussed as potential causes of patterns observed. Although we were unable to verify the origin of most post-larvae caught inside MPAs we suggest that they may act as genetic reservoirs due to high heterozigosity levels found in adult specimens inside (M. surmuletus) and nearby (both) them. Our results indicate that early life history traits (i.e. larvae) may not be the only determinant on species dispersal capability, suggesting that other mechanisms such as fine scale adult or juvenile movement may have been underestimated as promoting population connectivity.
Marine environmental research 08/2013; 92. DOI:10.1016/j.marenvres.2013.08.008 · 2.76 Impact Factor
Available from: Dr.S.N. Sethi
- "This was pointed out by low values of coefficient of variation (< 25%) for all measured variables and implied that each group consisted of a more or less phenotypical homogeneous group (Ferrito et al., 2007). Low values of CV may possibly also give explanation for high inheritability (Mamuris et al., 1998) and as a result a limited pressure of environmental variation on morphological S. N. Sethi et al. "
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ABSTRACT: The morphometric relationships of endemic species of the palaemonid prawn Macrobrachium lar collected from the rivers
of Andaman Islands, India, were studied. A total of 57 specimens (27 and 30 males and females) were examined using
8 morphometric measurements. Significant difference in the pattern of growth was observed in males and females with
regards to most of the characters. Coefficient of variation values estimated revealed a low intra-group variation (CV < 25%)
for all characters. Mean size of all the parameters show higher values in males compared to females. The morphometric traits
of female individuals showed more positive and significant correlations compared to their male counterparts. In general, few
parameters showed similar patterns of relative growth in both sexes. The total length was significantly related with telson
length, carapace width and body weight while telson length was positively correlated with carapace width and body weight.
The species clearly exhibits sexual dimorphism.
Indian Journal of Fisheries 01/2013; 60(2):157-161. · 0.22 Impact Factor
Available from: Ali Bani
- "Map of sampling area (•) of kutum, Rutilus frisii kutum, in the Bandar Anzali area () of the southwest Caspian Sea. basis for transformation and FL and TL are directly related to SL (Mamuris et al. 1998). Morphometric variables were standardized for size through dividing SL by morphometric variables, since heterogeneity in size between the different samples may cause heterogeneity in shape (Reist 1986). "
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ABSTRACT: Twenty-nine morphometric and seven meristic characteristics were analyzed to identify non-reproductive (NR) and reproductive (R) female kutum, Rutilus frisii kutum. Seventy one samples of mature-size female kutum were collected from coastal waters of the southwest Caspian Sea during spawning season. Principal component analysis, discriminant function analysis, cluster analysis, and a Kruskal-Wallis test were used to identify the two types of fish. The results showed morphological variations between the non-reproductive and reproductive kutum. Discriminant function analysis revealed NR: 91.9% and R: 91.2% while cluster analysis demonstrated NR: 100% and R: 85.3%, verifying the classification of members in each group. Maximum body height, post back distance, dorsal fin height, and up caudal fin length were detected as the most functional characteristics of morphological discrimination between the two types of kutum. Meristic counts, however, were not different between the two types of fish.
Italian Journal of Zoology 09/2012; 79(3):1-7. DOI:10.1080/11250003.2011.642414 · 0.79 Impact Factor
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