A Biometrical Study of Growth in Pseudemys concinna suwanniensis. I

Jackson, Crawford G.

doi:10.2307/1442280

Cited by 21 publications

(7 citation statements)

References 11 publications

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“…2A,B). This gap falls within the sizes at which growth was very rapid in populations of Pseudemys concinna and Pseudemys floridana in Florida (Jackson 1 970; Dreslik 1997; Jackson and Walker 1997; Huestis and Meylan 2004), as well as in populations of other emydid species (e.g. Trachemys scripta , Cagle 1946; Dunham and Gibbons 1990; Chrysemys picta , Frazer et al .…”

Section: Methodsmentioning

confidence: 76%

Comparative growth in the postnatal skull of the extant North American turtle Pseudemys texana (Testudinoidea: Emydidae)

Bever¹

2008

Acta Zoologica

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Bever, G.S. 2008. Comparative growth in the postnatal skull of the extant North American turtle Pseudemys texana (Testudinoidea: Emydidae). -Acta Zoologica (Stockholm) 89 : 107-131Postnatal growth is one of the many aspects of developmental morphology that remains distinctly understudied in reptiles. Variation and ontogenetic scaling within the skull of the extant emydid turtle, Pseudemys texana is described based on 25 continuous characters. Results indicate that skull shape in this species changes little during postnatal growth relative to the only cryptodire taxa for which comparable datasets are available ( Apalone ferox and Sternotherus odoratus ). This relative lack of change results in the paedomorphic retention of a largely juvenile appearance in the adult form of P. texana . The skulls of males and females, despite the presence of distinct sexual dimorphism in size, grow with similar scaling patterns, and the few observed differences appear to reflect alteration of the male growth trajectory. Comparisons with A. ferox and S. odoratus reveal a number of similarities and differences that are here interpreted within a phylogenetic context. These preliminary hypotheses constitute predictive statements that phylogenetically bracket the majority of extant cryptodire species and provide baseline comparative data that are necessary for the future recognition of apomorphic transformations. Plasticity of ontogenetic scaling as a response to the homeostatic needs and behaviour of individuals commonly is evoked as a limitation of ontogenetic scaling as a means to inform phylogenetic studies. These evocations are largely unfounded considering that variability itself can evolve and thus be phylogenetically informative.

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Section: Methodsmentioning

confidence: 76%

Comparative growth in the postnatal skull of the extant North American turtle Pseudemys texana (Testudinoidea: Emydidae)

Bever¹

2008

Acta Zoologica

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“…1975 or when they have access to supplementary food (Licht 1974). However, the direct relationship between nourishment and growth rate could be masked by the effect on the growth rates produced by water availability (Nagy 1973, Smith 1977 or by the existence 01' circadian rhythms of appetite and other endogenous factors (Jackson 1970, Licht 1972.…”

Section: Discussionmentioning

confidence: 99%

Growth effort of <i>Sceloporus scalaris</i> (Sauria: Phrynosomatidae) at La Michilía Biosphere Reserve, Mexico

Ortega‐Rubio

Barbault²,

Halffter

et al. 2015

RBT

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Usando métodos de Marca-Recaptura estudiamos el esfuerzo de crecimiento de Sceloporus scalaris en la Reserva de laBiosfera de La Michilía, Durango, México. Se analizaron 146 registros de recaptura sobre 68 individuos en cuatro años de estudio en un transecto de 50 000 m'. El esfuerzo de crecimiento disminuye drasticamente conforme el individuo crece, es casi igual para los machos y hembras de 1m; dos puestas, y en el caso de los adultos se registró un crecimiento más rapido en primavera. El patrón de crecimiento sigue las predicciones propuestas por el modelo de Benalanffy. Los recién nacidos de S. scalaris eclosionan cuando la disponibilidad de alimento es todavía la más propicia. La madurez sexual de los individuos es muy precoz en La Michilía: de 4.5 a 6 meses. El patrón de crecimiento de S. scalaris en La Michilía ayuda a explicar la estructura y dinámica de esta población.

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“…The size at which sampling is the least dense occurs between approximately 75 and 110 mm carapace length ( 65-90-mm plastron length and 20-25-mm total skull length; see Figure 2, Bever, 2008). This gap falls within the sizes at which growth was most rapid in populations of P. concinna and P. floridana in Florida (Jackson, 1970;Dreslik, 1997;Jackson and Walker, 1997;Huestis and Meylan, 2004), as well as in populations of other emydid species (e.g., Trachemys scripta, Cagle, 1946;Dunham and Gibbons, 1990); Chrysemys picta, (Frazer et al, 1991(Frazer et al, , 1993; Glyptemys insculpta, Lovich et al, 1990). Growth rates and age of sexual maturity are not reported specifically in P. texana; however, turtles generally are accepted to exhibit growth rates that are relatively high early in postnatal ontogeny followed by a significant decline or cessation of growth at or near the attainment of sexual maturity (Cagle, 1946;Kennett, 1996;Litzgus and Brooks, 1998).…”

Section: Age Estimationmentioning

confidence: 93%

The postnatal skull of the extant North American turtle Pseudemys texana (Cryptodira: Emydidae), with comments on the study of discrete intraspecific variation

Bever

2008

Journal of Morphology

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This study describes the postnatal morphology of the skull in the extant testudinoid turtle Pseudemys texana. The material basis of this study is drawn from a single population and therefore provides the opportunity to document cranial variation expressed at multiple levels of inference (e.g., ontogeny, sexual dimorphism, individual) within a taxonomically restricted sample. Such descriptions are exceedingly rare for reptiles but are important for evaluating the inherent biological information that skeletal morphology provides to more inclusive biological questions. Results indicate that postnatal variation in Pseudemys texana for discrete cranial characters is considerable, especially when recognizing the taxonomically conservative nature of the sample and the fact that most of the examined characters were drawn from published phylogenetic analyses. Results demonstrate a complex relationship between size, skeletal maturity, and the expression of discrete skeletal characters in this sexually dimorphic reptile. Such complexity potentially could affect our interpretation of evolutionary history based on discrete characters. This study emphasizes the need for increasing the numbers and taxonomic breadth of morphological descriptions based on expanded samples so that a better understanding of the phylogenetic distribution and modular expression of anatomical variability can be achieved. The available empirical data lag seriously behind recent theoretical advances that broaden the application of intraspecific variation data for discrete characters to phylogenetic and evolutionary questions.

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A Biometrical Study of Growth in Pseudemys concinna suwanniensis. I

Cited by 21 publications

References 11 publications

Comparative growth in the postnatal skull of the extant North American turtle Pseudemys texana (Testudinoidea: Emydidae)

Comparative growth in the postnatal skull of the extant North American turtle Pseudemys texana (Testudinoidea: Emydidae)

Growth effort of <i>Sceloporus scalaris</i> (Sauria: Phrynosomatidae) at La Michilía Biosphere Reserve, Mexico

The postnatal skull of the extant North American turtle Pseudemys texana (Cryptodira: Emydidae), with comments on the study of discrete intraspecific variation

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