Sexual Dichromatism in the Northern Map Turtle,Graptemys geographica

2013 ◽  
Vol 12 (1) ◽  
pp. 187-192 ◽  
Author(s):  
Grégory Bulté ◽  
Ryan R. Germain ◽  
Constance M. O'Connor ◽  
Gabriel Blouin-Demers
Keyword(s):  
Sexual Dichromatism ◽  
Graptemys Geographica ◽  
Northern Map Turtle

Discovery of the Northern Map Turtle (Graptemys geographica LeSueur 1817) in Far Northeastern Mississippi

2020 ◽  
Vol 19 (2) ◽  
Author(s):  
Grover J. Brown ◽  
Luke Pearson ◽  
Gabrielle Berry ◽  
Will Selman
Keyword(s):  
Graptemys Geographica ◽  
Northern Map Turtle

Demographic differences among populations of Northern Map Turtles (Graptemys geographica) in intact and fragmented sites

2009 ◽  
Vol 87 (12) ◽  
pp. 1147-1157 ◽  
Author(s):  
A. M. Bennett ◽  
M. Keevil ◽  
J. D. Litzgus
Keyword(s):  
Growth Rates ◽  
Sex Ratios ◽  
Habitat Alteration ◽  
Population Densities ◽  
Demographic Differences ◽  
Fragmented Habitats ◽  
Habitat Alterations ◽  
Map Turtles ◽  
Graptemys Geographica ◽  
Northern Map Turtle

Habitat fragmentation is a leading cause of reptile declines worldwide. We examined demographic differences between populations of Northern Map Turtles, Graptemys geographica (Le Sueur, 1817), inhabiting intact and fragmented sites along the Trent–Severn Waterway (TSW) in Ontario over two field seasons. We examined population densities, sex ratios, body size, and growth rates in two control sites and two fragmented sites (where the waterway is disrupted by dams). We predicted that population density would be higher in control sites, and that sex ratios would differ among sites. Abundance was greater than expected, but densities could not be compared owing to a lack of recaptures. Sex ratios in control sites were slightly male-biased and were significantly female-biased in fragmented sites. Turtles in fragmented habitats were significantly smaller than those in control habitats. Estimated growth rates of juveniles and males were significantly reduced in fragmented populations compared with controls. We hypothesize that habitat alterations in fragmented sites are differentially affecting demographic classes because of the intersexual niche divergence observed in Map Turtles. We emphasize the need for further research to examine the interactions between habitat alteration and invasive species and the effects they are having on Northern Map Turtle populations.

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.

Cryptic sexual dichromatism occurs across multiple types of plumage in the Green-backed Tit Parus monticolus

Ibis ◽  
2006 ◽  
Vol 149 (2) ◽  
pp. 264-270 ◽  
Author(s):  
CHRISTOPHER HOFMANN ◽  
WEN-SUI LO ◽  
CHENG-TE YAO ◽  
SHOU-HSIEN LI
Keyword(s):  
Sexual Dichromatism

scholarly journals Mass mortality of Northern Map Turtles (Graptemys geographica)

2015 ◽  
Vol 129 (1) ◽  
pp. 80 ◽  
Author(s):  
Jordan Catrysse ◽  
Emily Slavik ◽  
Jonathan Choquette ◽  
Ashley E. Leifso ◽  
Christina M. Davy
Keyword(s):  
Lake Erie ◽  
Mass Mortality ◽  
Species At Risk ◽  
Long Term Effects ◽  
North Shore ◽  
The North ◽  
The Poor ◽  
Map Turtles ◽  
Graptemys Geographica

We report a mass mortality of Northern Map Turtles (Graptemys geographica [LeSueur, 1817]) on the north shore of Lake Erie, Ontario, Canada. Thirty-five dead adult females were recovered from a nesting area over a period of four weeks. Predation and boat strikes were both excluded as potential cause of death, but the actual cause could not be determined because of the poor condition of the carcasses. Other possible explanations for the mortality include poisoning, drowning, and infection with an unidentified pathogen. Mass mortality in long-lived species, such as turtles, can have long-term effects on population growth and is a cause for concern in a species at risk.

Bluegill Coloration as a Sexual Ornament: Evidence From Ontogeny, Sexual Dichromatism, and Condition Dependence

Ethology ◽  
2010 ◽  
Vol 116 (5) ◽  
pp. 416-428 ◽  
Author(s):  
Karen M. Cogliati ◽  
Lynda D. Corkum ◽  
Stéphanie M. Doucet
Keyword(s):  
Condition Dependence ◽  
Sexual Dichromatism ◽  
Sexual Ornament
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