Countergradient Variation in Locomotor Performance of Two Sympatric Polynesian Skinks (Emoia impar, Emoia cyanura)

2014 ◽  
Vol 87 (2) ◽  
pp. 222-230 ◽  
Author(s):  
Matthew T. McElroy
Keyword(s):  
Locomotor Performance ◽  
Countergradient Variation

Dealing with hot rocky environments: Critical thermal maxima and locomotor performance in Leptodactylus lithonaetes (Anura: Leptodactylidae)

2019 ◽  
pp. 155-161 ◽  
Author(s):  
Ivan Beltran
Keyword(s):  
Environmental Temperature ◽  
Extreme Temperature ◽  
Effect Of Temperature ◽  
Maximum Speed ◽  
Locomotor Performance ◽  
Extreme Temperatures ◽  
Physiological Limits ◽  
Fitness Consequences ◽  
Thermal Maximum ◽  
Environmental Temperatures

Environmental temperature has fitness consequences on ectotherm development, ecology and behaviour. Amphibians are especially vulnerable because thermoregulation often trades with appropriate water balance. Although substantial research has evaluated the effect of temperature in amphibian locomotion and physiological limits, there is little information about amphibians living under extreme temperature conditions. Leptodactylus lithonaetes is a frog allegedly specialised to forage and breed on dark granitic outcrops and associated puddles, which reach environmental temperatures well above 40 ˚C. Adults can select thermally favourable microhabitats during the day while tadpoles are constrained to rock puddles and associated temperature fluctuations; we thus established microhabitat temperatures and tested whether the critical thermal maximum (CTmax) of L. lithonaetes is higher in tadpoles compared to adults. In addition, we evaluated the effect of water temperature on locomotor performance of tadpoles. Contrary to our expectations, puddle temperatures were comparable and even lower than those temperatures measured in the microhabitats used by adults in the daytime. Nonetheless, the CTmax was 42.3 ˚C for tadpoles and 39.7 ˚C for adults. Regarding locomotor performance, maximum speed and maximum distance travelled by tadpoles peaked around 34 ˚C, approximately 1 ˚C below the maximum puddle temperatures registered in the puddles. In conclusion, L. lithonaetes tadpoles have a higher CTmax compared to adults, suggesting a longer exposure to extreme temperatures that lead to maintain their physiological performance at high temperatures. We suggest that these conditions are adaptations to face the strong selection forces driven by this granitic habitat.

Locomotor Performance in Highly-Trained Young Soccer Players: Does Body Size Always Matter?

2013 ◽  
Vol 35 (06) ◽  
pp. 494-504 ◽  
Author(s):  
M. Buchheit ◽  
A. Mendez-Villanueva ◽  
N. Mayer ◽  
H. Jullien ◽  
A. Marles ◽  
...  
Keyword(s):  
Body Size ◽  
Soccer Players ◽  
Locomotor Performance

scholarly journals Evidence of Countergradient Variation in Growth of Spotted Gars from Core and Peripheral Populations

2015 ◽  
Vol 144 (4) ◽  
pp. 837-850 ◽  
Author(s):  
Solomon R. David ◽  
Richard S. Kik ◽  
James S. Diana ◽  
Edward S. Rutherford ◽  
Michael J. Wiley
Keyword(s):  
Peripheral Populations ◽  
Countergradient Variation

More sires may enhance offspring fitness in Northern Map Turtles (Graptemys geographica)

2013 ◽  
Vol 91 (8) ◽  
pp. 581-588 ◽  
Author(s):  
Nicola Banger ◽  
Gabriel Blouin-Demers ◽  
Grégory Bulté ◽  
Stephen C. Lougheed
Keyword(s):  
Sexual Selection ◽  
Reproductive Success ◽  
Hatching Success ◽  
Locomotor Performance ◽  
Conservative Estimate ◽  
Genetic Quality ◽  
Offspring Fitness ◽  
Sexual Selection Theory ◽  
Map Turtles ◽  
Graptemys Geographica

Sexual selection theory predicts that males should be promiscuous to maximize their reproductive success, while females should be choosy. Yet females of many taxa often produce progeny sired by multiple males, indicating that promiscuity can be important for the reproductive success of females. Promiscuity may enhance the fitness of females if it increases the genetic quality, or the genetic variety, and thus the viability of their offspring. We quantified the number of sires per clutch in a population of Northern Map Turtles (Graptemys geographica (LeSueur, 1817)) in Lake Opinicon, Ontario, Canada, and tested whether the number of sires affects several metrics of viability in hatchlings. Based on the most conservative estimate, at least 71% of clutches in this population are sired by multiple males, but there was no evidence that larger clutches are sired by more males. Clutches sired by more males had higher hatching success and survival, but the differences were not statistically significant. We did not find any effect of the number of sires on hatchling morphology or locomotor performance. Collectively, our results partially support the hypothesis that promiscuity can increase the reproductive success of female Northern Map Turtles.

Locomotor performance in an invasive species: cane toads from the invasion front have greater endurance, but not speed, compared to conspecifics from a long-colonised area

Oecologia ◽  
2009 ◽  
Vol 162 (2) ◽  
pp. 343-348 ◽  
Author(s):  
John Llewelyn ◽  
Benjamin L. Phillips ◽  
Ross A. Alford ◽  
Lin Schwarzkopf ◽  
Richard Shine
Keyword(s):  
Invasive Species ◽  
Locomotor Performance ◽  
Invasion Front
Sign in / Sign up

Export Citation Format

Share Document