User:Biologiaphilosophus/Temperature-dependent sex determination

Intro:
“The eggs are affected by the temperature at which they are incubated during the middle one-third of embryonic development. This critical period of incubation is known as the thermosensitive period (TSP).” middle one-third just sounds bad also might be unnecessary to state here since there is a TSP section

Thermosensitive period:
“temperature pulses” weird wording

“After this period, however, sex reversal is impossible.” This sentence doesn’t really make sense in the context of the previous sentence - Done

Could possibly expand on this section

Specify that TSP is only in the middle third at constant temperatures and can vary when temperature fluctuates

Types:
Figure should maybe express that it is showing pattern IA but not IB.

“Very near or at the pivotal temperature of sex determination, mixed sex ratios and (more rarely) intersex individuals.” This does not make sense

Pattern IA and IB paragraph could be better worded and laid out:

"Pattern IA has a single transition zone, where eggs predominantly hatch males if incubated below this temperature zone, and predominantly hatch females if incubated above it. Pattern IA occurs in most turtles, with the transition between male-producing temperatures and female-producing temperatures occurring over a range of temperatures as little as 1–2°C.[13] Pattern IB also has a single transition zone, but females are produced below it and males above it. Pattern IB occurs in the tuatara."

It has been proposed that essentially all modes of TSD are actually Pattern II and those that deviate from the expected female-male-female pattern are species whose viable temperature range does not allow for the extreme temperatures needed to pass the second threshold. - Done

Final paragraph is not discussing the types anymore, could be moved to another section.

Examples:
This section could be expanded upon, don’t really know what the histone paragraph has to do with examples

Australian Brush Turkey confusion on the source used, possibly look for more info on this

Hormones in TSD systems:

Adaptive significance:
Could mention that research has shown that hatchling viability is likely favored over sex ration when choosing nesting location in crocodilians.

Could also mention these tests were conducted at constant temperatures and may not be fully indicative of results seen in the wild.

"Temperature sex determination could allow the mother to determine the sex of her offspring by varying the temperature of the nest in which her eggs are incubated. However, there is no evidence thus far that sex ratio is manipulated by parental care." Don’t think we are supposed to use direct quotes…

instead...

Climate change effects:
Earlier nesting is not proven to be for preservation of sex ratio but rather seasonal adaptation/hatchling success.

It has been proposed that sea turtles may be able to use TSD to their advantage in a warming climate. When the offspring viability is decreased due to increased temperatures, they are able to use the coadaptation between sex ratio and survivability to increase the production of female offspring. This allows sea turtles to maintain populations and could increase their resiliency to climate change.