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a chart comparing territory quality versus status of deposed females.
Quality of Territory Previously Inhabited by Deposed Female Warblers Values of territory quality were derived from logistic regression analyses and normalized by log transformation. Ousted females that chose to become subordinates usually lived in territories of higher quality than those that chose to become floaters (Adapted from Richardson et al. 2007).


Cooperative breeding is driven by a variety of ecological factors, specific to the circumstances of the species in question. Some adult birds choose to become helpers in an effort to secure food and settling sites when resources are scarce. Others resort to helping behavior because their own personal attempts at reproduction have failed or they have lost their breeding status, and helping is the next best opportunity to pass on their genes, albeit indirectly. In each case, the cooperative breeding phenomenon appears to benefit either the helpers, the parents, or the chicks, creating a beneficial situation for the individuals involved.

Why Cooperative Breeders Choose to Become Helpers
Cooperative Breeder Reason for Helping
Azure-Winged Magpie Lack of available resources
Micronesian Kingfisher Access to ideal nesting sites and food
Brown-Headed Nuthatch Personal breeding failure
Seychelles Warbler (Grandparents) Best opportunity to pass on genes

Discussion questions

  1. Is cooperative breeding actually altruistic behavior? In what situations might it be entirely altruistic, and in what situations does the helper have an “ulterior motive”?
  2. While many birds do engage in cooperative breeding, many do not. What are the conditions that likely differentiate these species in terms of environmental factors, predation risks, and breeding patterns?


  • Altruism - helpful behavior that directly increases the fitness of the recipient at the expense of decreasing the fitness of the actor
  • Alloparent - offspring care-giver that is not a direct parent
  • Cooperative breeding - social system where individuals that are not the direct parents of the offspring play an active role in nurturing and caring for offspring
  • Direct fitness - genes are contributed to the next generation through personal reproduction, in the form of descendent offspring
  • Dominant pair - direct genetic parents of offspring
  • Floater - bird with no territory or permanent residence
  • Hamilton’s Rule - gene frequency should increase in interactions where rB>C , where r is the genetic relatedness of individuals, B is reproductive benefit gained by the recipient, and C represents the reproductive cost to the alloparent
  • Indirect fitness - genes are indirectly contributed to the next generation by helping non-directly related offspring in the form of relatives that would not have survived otherwise
  • Kin selection - form of natural selection that occurs when individuals alter their behavior to favorably affect genetically related individuals
  • Nondescendent kin - young progeny that are not direct offspring


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Questions & Answers

can someone help me with some logarithmic and exponential equations.
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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?
Commplementary angles
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what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
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a perfect square v²+2v+_
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algebra 2 Inequalities:If equation 2 = 0 it is an open set?
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or infinite solutions?
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
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if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
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rolling four fair dice and getting an even number an all four dice
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Kristine 2*2*2=8
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Differences Between Laspeyres and Paasche Indices
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No. 7x -4y is simplified from 4x + (3y + 3x) -7y
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J, combine like terms 7x-4y
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Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
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. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
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Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
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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
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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
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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.
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the Beer law works very well for dilute solutions but fails for very high concentrations. why?
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Source:  OpenStax, Mockingbird tales: readings in animal behavior. OpenStax CNX. Jan 12, 2011 Download for free at http://cnx.org/content/col11211/1.5
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