Reproduction and Sexual Dimorphism in Two Populations of Sceloporus grammicus (Sauria: Phrynosomatidae) from Hidalgo, Mexico

Herpetologica ◽  
2010 ◽  
Vol 66 (1) ◽  
pp. 12-22 ◽  
Author(s):  
Uriel Hernández-Salinas ◽  
Aurelio Ramírez-Bautista ◽  
Adrian Leyte-Manrique ◽  
Geoffrey R. Smith
Keyword(s):  
Sexual Dimorphism ◽  
Sceloporus Grammicus ◽  
Two Populations

Intraspecific variation in a lizard from the Central Mexican Plateau: intersexual differences in size and shape explored

2020 ◽  
Vol 131 (3) ◽  
pp. 656-666
Author(s):  
Abraham Lozano ◽  
Aurelio Ramírez-Bautista ◽  
Raciel Cruz-Elizalde
Keyword(s):  
Body Size ◽  
Trophic Niche ◽  
Size And Shape ◽  
Biomechanical Models ◽  
Tree Population ◽  
Morphological Adaptations ◽  
Selective Forces ◽  
Sceloporus Grammicus ◽  
Intraspecific Morphological Variation ◽  
Two Populations

Abstract Morphological adaptations of individuals are directly (or indirectly) determined by the environment. Depending on sex, these adaptations may vary in different ways, given that different selective forces may be operating on organisms. Here, we evaluate intraspecific morphological variation (size and shape) in two populations of Sceloporus grammicus that occur in different structural habitats (trees and rocks). No difference in overall body size was found between the two populations. However, strong differences were found in body shape; the tree population was characterized by having shorter hindlimb proportions than the rock population, which agrees with the theory of biomechanical models. Furthermore, our results show that this species is dimorphic in size and shape, both in sex and population effects. A review of the literature suggests that the large overall body size and relatively longer distal segments of males could be an advantage for defending their territory, and the observation that females had relatively longer head length may be related to trophic niche divergence; however, this remains to be tested. Detailed quantification of behaviour, performance and reproductive characteristics must be performed to shed light on the evolution of sexual dimorphism in this widely distributed species in Mexico.

scholarly journals Intra-Specific Venom Variation in the Australian Coastal Taipan Oxyuranus scutellatus

Toxins ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 485 ◽  
Author(s):  
Theo Tasoulis ◽  
Anjana Silva ◽  
Punnam Chander Veerati ◽  
Mark Baker ◽  
Wayne C. Hodgson ◽  
...  
Keyword(s):  
Sexual Dimorphism ◽  
Snake Venom ◽  
Geographical Variation ◽  
East Coast ◽  
Population Variation ◽  
The Other ◽  
North East ◽  
The North ◽  
Specific Variation ◽  
Two Populations

Intra-specific venom variation has the potential to provide important insights into the evolution of snake venom, but remains a relatively neglected aspect of snake venom studies. We investigated the venom from 13 individual coastal taipans Oxyuranus scutellatus from four localities on the north-east coast of Australia, spanning a distance of 2000 km. The intra-specific variation in taipan venom was considerably less than the inter-specific variation between it and the other Australian elapids to which it was compared. The electrophoretic venom profile of O. scutellatus was visually different to six other genera of Australian elapids, but not to its congener inland taipan O. microlepidotus. There was minimal geographical variation in taipan venom, as the intra-population variation exceeded the inter-population variation for enzymatic activity, procoagulant activity, and the abundance of neurotoxins. The pre-synaptic neurotoxin (taipoxin) was more abundant than the post-synaptic neurotoxins (3FTx), with a median of 11.0% (interquartile range (IQR): 9.7% to 18.3%; range: 6.7% to 23.6%) vs. a median of 3.4% (IQR: 0.4% to 6.7%; range: 0% to 8.1%). Three taipan individuals almost completely lacked post-synaptic neurotoxins, which was not associated with geography and occurred within two populations. We found no evidence of sexual dimorphism in taipan venom. Our study provides a basis for evaluating the significance of intra-specific venom variation within a phylogenetic context by comparing it to the inter-specific and inter-generic variation. The considerable intra-population variation we observed supports the use of several unpooled individuals from each population when making inter-specific comparisons.

scholarly journals Length-weight relationship and morphometrics of Osmerus eperlanus populations from two lakes of northeastern Poland

2021 ◽  
Vol 29 (3) ◽  
pp. 185-188
Author(s):  
Andrzej Kapusta ◽  
Piotr Traczuk ◽  
Piotr Chmieliński ◽  
Krzysztof Kozłowski
Keyword(s):  
Sexual Dimorphism ◽  
Morphological Characters ◽  
Coefficient Of Determination ◽  
Detailed Data ◽  
Morphometric Characters ◽  
High Coefficient ◽  
Weight Relationship ◽  
Northeastern Poland ◽  
Osmerus Eperlanus ◽  
Two Populations

Abstract This study provides the length-weight relationship (LWR) of European smelt (Osmerus eperlanus) occurring in two lakes in northeastern Poland. The morphometric characters of the two populations of this species in lakes Dargin and Dejguny were also compared. The LWRs were highly significant (P < 0.05) with a high coefficient of determination (r2 ≥ 0.923). The estimated b values ranged from 3.256 to 3.508. Sixteen of the 26 morphological characters measured differed between the two populations. No sexual dimorphism was observed. The research presents detailed data on the biometric characters of the species that contributes to the assessment of phenotypic plasticity and general morphological variation of the populations.

scholarly journals A new hidden species of the Cymothoe caenis-complex (Lepidoptera: Nymphalidae) from western Africa

Zootaxa ◽  
2009 ◽  
Vol 2197 (1) ◽  
pp. 53-63 ◽  
Author(s):  
ROBIN VAN VELZEN ◽  
TORBEN B. LARSEN ◽  
FREEK T. BAKKER
Keyword(s):  
Sexual Dimorphism ◽  
Niger Delta ◽  
Distinct Species ◽  
Common Species ◽  
Equatorial Zone ◽  
Western Africa ◽  
Single Form ◽  
Two Populations

Butterflies of the Afrotropical genus Cymothoe are characterised by sexual dimorphism. Females of the most common species of the genus, Cymothoe caenis Drury, occur in many different forms in the equatorial zone, while only a single form is present west of the Niger Delta in Nigeria, raising the question as to whether the two populations need taxonomic recognition. We present molecular and genitalic evidence that the western populations of C. caenis s.l. comprise a distinct species: Cymothoe druryi sp. nov.

Diet of Two Populations of Sceloporus grammicus (Squamata: Phrynosomatidae) from Hidalgo, Mexico

2010 ◽  
Vol 55 (1) ◽  
pp. 98-103 ◽  
Author(s):  
Adrian Leyte-Manrique ◽  
Aurelio RamÍrez-Bautista
Keyword(s):  
Sceloporus Grammicus ◽  
Two Populations

Reproduction and sexual dimorphism in two populations of the polymorphic spiny lizardSceloporus minorfrom Hidalgo, México

2013 ◽  
Vol 95 (4) ◽  
pp. 397-408 ◽  
Author(s):  
Aurelio Ramírez-Bautista ◽  
Barry P. Stephenson ◽  
Carmen Serrano Muñoz ◽  
Raciel Cruz-Elizalde ◽  
Uriel Hernández-Salinas
Keyword(s):  
Sexual Dimorphism ◽  
Two Populations

Sexual dimorphism and age structure of the Montseny newt (Calotriton arnoldi)

2015 ◽  
Vol 36 (3) ◽  
pp. 245-252 ◽  
Author(s):  
Fèlix Amat ◽  
Neus Oromí ◽  
Delfí Sanuy ◽  
Salvador Carranza
Keyword(s):  
Life History ◽  
Sexual Dimorphism ◽  
Age Structure ◽  
Sexual Maturity ◽  
Life History Traits ◽  
Geographic Scale ◽  
Total Body ◽  
Similar Body ◽  
Two Populations ◽  
Small Geographic Scale

Patterns of sexual dimorphism and age structure were investigated in two populations of the newtCalotriton arnoldi, endemic of the Montseny Massif (NE of the Iberian Peninsula). In contrast to the Pyrenean newt (Calotriton asper) sexual dimorphism in the Montseny brook newt is characterized by slightly larger females (60.3 ± 0.3 mm; maximum: 68 mm) than males (59.5 ± 0.2 mm; maximum: 64 mm) and more similar body shape between sexes. Both populations and sexes mature at the same age (3 years), show the same age structure and achieve similar longevity (8-9 years). Comparing our results with the framework of the variation of life-history traits inCalotriton, the Montseny newts exhibit fast sexual maturity and short longevity. Curiously, we have found a lack of covariation between age at sexual maturity, longevity and total body size in the populations ofCalotritonspecies. Only in males, age at sexual maturity seems to be affected by altitude, but in an unexpected way: sexual maturation is delayed in populations at low altitudes. Moreover, the age at sexual maturity does not differs between the populations where immatures are terrestrial vs. those where they remain aquatic. Our results suggest that life-history traits inCalotritonnewts could be determined by selective factors that play their role at small geographic scale.

Use of time, space, and food by the gymnophthalmid lizardPrionodactylus eigenmanni from the western Amazon of Brazil

1998 ◽  
Vol 76 (9) ◽  
pp. 1681-1688 ◽  
Author(s):  
Laurie J Vitt ◽  
Shawn S Sartorius ◽  
Teresa Cristina S. Avila-Pires ◽  
Maria Cristina Espósito
Keyword(s):  
Sexual Dimorphism ◽  
Body Temperatures ◽  
Terra Firme ◽  
Food Items ◽  
Use Of Time ◽  
Air Temperatures ◽  
Time Space ◽  
Different Seasons ◽  
Terra Firme Forest ◽  
Two Populations

The gymnophthalmid lizard Prionodactylus eigenmanni lives in leaf litter of terra firme forest in the western Amazon. Lizards are active during sunny and cloudy periods and body temperatures are 27.2 ± 0.19°C (mean ± SE). Body temperatures did not correlate with substrate or air temperatures: P. eigenmanni apparently gain heat by seeking temporary patches of relatively warm microhabitat. Two populations (Rio Ituxí in Amazonas and central Rondônia) were compared with respect to diet and morphology. The diet consists of a wide variety of invertebrates, but spiders, homopterans, orthopterans, and roaches constitute the majority of food items. Prey types and sizes in the two localities were similar. Females are larger than males and there is no apparent sexual dimorphism in head size as is found in many other lizards. Even though the two populations were studied in different seasons, there was no indication that wet versus dry season affected the ecology of these lizards.

BODY SIZE, SEXUAL DIMORPHISM, AND CLUTCH SIZE IN TWO POPULATIONS OF THE LIZARD SCELOPORUS OCHOTERANAE

2003 ◽  
Vol 48 (1) ◽  
pp. 123-126 ◽  
Author(s):  
Geoffrey R. Smith ◽  
Julio A. Lemos-Espinal ◽  
Royce E. Ballinger
Keyword(s):  
Body Size ◽  
Sexual Dimorphism ◽  
Clutch Size ◽  
Two Populations
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