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Sexual cannibalism also exhibits an intriguing interplay between sexual and natural selection pressures. Depending on the timing of cannibalism (pre or post-mating), it can be either the process by which genes are selectively favored, or the instrument of their elimination. The relationship between female mate choice and natural selection through cannibalism may not be static, but contingent on the shifting value of the male as mate or prey item (Persons and Uetz 2005). Further research into the timing of sexual cannibalism could expand an awareness of this dynamic.

Diverse sexual cannibal species

Spiders and mantises are the basis of most research on sexual cannibalism, but the behavior has been anecdotally and experimentally observed in a variety of organism orders.

picture of horned nudibranch Herminssenda Crassicori
The horned nudibranch Herminssenda Crassicoris will consume members of its own species while mating if the male is small enough to be ingested (Megina and Cervera 2002). Image :Lemurdillo http://www.flickr.com/photos/lemurdillo/2650327503/in/set-72157607190457016/ .
picture of copepods
Copepods, small marine arthropods that include many species of plankton, occasionally exhibit sewual cannibalism. Image :Ethan Hein http://www.flickr.com/photos/ethanhein/2250890367/ .
picture of scorpions
Sexual cannibalism is rare in scorpions, but males have still developed the behavior of rapidly backing away from the female after copulation has terminated. Image :Andres N. Hayes http://www.flickr.com/photos/26432312@N06/2845311259/ .

Box

Nuptial gifts, why don’t males offer a proxy?

Males of some species provide “nuptial gifts,” or alluring food items, to females during a mating interaction (Choe 1995). The purpose of the gift is to entice females to accept the aspiring mate, and often his success is contingent on the size of the gift procured. The donation of foraged prey before mating is prominently seen in birds and insects, though one spider, Pisaura mirabilis, displays this courting ritual as well (Stalhandske 2001). Some insects, centipedes, and onycophorans offer nuptial gifts in the form of seminal secretions. When sexually cannibalized males offer their own body parts or soma as nourishment, they may also be viewed as extending a nuptial gift (Stalhandske 2001). But why don’t male mantises and spiders offer a “cheaper” version of the nuptial gift (a prey item, a nonessential body part, etc.), instead of opting for total self-sacrifice?

One study uses an experimental method of hypothesis testing to determine the value of the nuptial gift and its effectiveness as a proxy for the male suitor. Stalhandske summarized three hypotheses for gift giving:

  • The nuptial gift could represent a paternal investment. If the nutrients of the “gift” increase female fecundity and, subsequently, the fitness of the male’s own offspring, the offering has adaptive value. According to this hypothesis, nuptial gift giving arose from natural selection (Stalhandske 2001).
  • The gift could represent a male mating effort. Its primary purpose is to tempt the female to mate, distract the female while the male assumes a copulatory position, and maximize ejaculate transfer. According to this hypothesis, gift giving is derived from sexual selection.
  • Gift giving could be a mechanism for protecting the male from sexual cannibalism. By this hypothesis, the nuptial gift promotes male survivability and thus is a consequence of natural selection (Stalhandske 2001).

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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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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