<< Chapter < Page Chapter >> Page >

Thermal niche-fecundity and social factors hypotheses

However, despite the clear association between sexual dimorphism (due to viviparous and ovoviviparous reproduction) and sexual segregation, none of the hypotheses presented above are able to explain the presence of sexual segregation within the catshark, Sychliorhinus canicula (Wearmouth&Sims, 2008). Since catsharks oviparous , the females do need larger physique for bearing live young. As a consequence, S. canicula is one of the few monomorphic species of elasmobranches, making it an ideal model of study for environmentally and socially instigated sexual selection (Sims, 2003).

The thermal niche-fecundity and social factors hypotheses are very different theories: where the thermal niche-fecundity hypothesis suggests that sharks maximize reproductive success by responding to changes in environmental temperatures, the social factors hypothesis proposes that the sharks consciously segregate themselves by sexual preference and other social factors (Wearmouth&Sims, 2008).

Sychliorhinus canicual practices both spatial and habitat segregation despite being monomorphic: the female catsharks are found to spend most of their time in small tunnels in tidal loughs while the males are found to spend most of their time in deep waters offshore (Sims et al, 2001). However the cause of segregation in the catshark , S. canicula , is very different from the previous model: the two sexes are segregated for different reasons. While the female catsharks may gain benefits from the warm temperature of the shallows, these benefits are speculative at best; their behaviors are better explained as a social response to male violence during copulation. On the other hand, the males segregate themselves from the females solely because of an abiotic factor. Since all physical traits and prey preferences are the same, the differing reasons for segregation boil down to one thing: reproductive benefits.

Sims et al speculated in 2001 that female S. canicula lounge in the warm shallows, rather than the colder water found offshore, in order to better facilitate egg development, as observed in similar behaviorisms exhibited by many other elasmobranch species, such Triakis semifasciata , the leopard sharks . Refuging system behavior is often observed in adult female leopard sharks shortly after early summer mating (Hight&Lowe, 2007). The leopard sharks would migrate in groups to the warmest areas in the shallows, occasionally shifting position in order to remain in the warmest spot at all times, to better facilitate digestion, somatic growth, and embryonic development (Hight&Lowe, 2007). However, despite helping with growth and digestion, embryonic development is the most important proximate cause that facilitates this refuging behavior since reproduction is the only factor that directly increases the fitness of the organism. This is further supported by the fact that only mature female T. semifasciata exhibit this basking behavior during August, a time period associated with early embryonic development (Hight&Lowe, 2007). If this behavior was solely for facilitating growth, then juvenile females and males would also be spotted.

Questions & Answers

find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
how do they get the third part x = (32)5/4
kinnecy Reply
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
I'm not sure why it wrote it the other way
I got X =-6
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
is it a question of log
Commplementary angles
Idrissa Reply
im all ears I need to learn
right! what he said ⤴⤴⤴
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!

Source:  OpenStax, Mockingbird tales: readings in animal behavior. OpenStax CNX. Jan 12, 2011 Download for free at http://cnx.org/content/col11211/1.5
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Mockingbird tales: readings in animal behavior' conversation and receive update notifications?