Southern-Summer School on Mathematical Biology

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2014:groups:g1:start [2014/01/30 09:41] – [Group] kraenkel2014:groups:g1:start [2024/01/09 18:45] (current) – external edit 127.0.0.1
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 +**Group 1**
 ====== Sex, death and silence in Hawaiian crickets ====== ====== Sex, death and silence in Hawaiian crickets ======
  
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 If you are a group member login to edit this page, create new pages from it, and upload files. If you are a group member login to edit this page, create new pages from it, and upload files.
  
 +=== Final Presentation ===
 +
 +{{:2014:groups:g1:presentation-1.pdf|GROUP 1 Presentation}}
 ===== Group ===== ===== Group =====
  
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 ---- ----
  
- + === Assistants === 
 + 
 +  * Flávia Marquitti 
 +  * Juliana Berbert 
 +  * Bernardo Niebuhr 
 + 
 + 
 +----
  
 ===== Assignment ===== ===== Assignment =====
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 {{http://www.qm.qld.gov.au/Find+out+about/Animals+of+Queensland/Insects/Keeping+insects+at+home/~/media/97AB0C743B8B4906AB36C1F6673CDF23.jpg?200 |Teleogryllus oceanicus}} {{http://www.qm.qld.gov.au/Find+out+about/Animals+of+Queensland/Insects/Keeping+insects+at+home/~/media/97AB0C743B8B4906AB36C1F6673CDF23.jpg?200 |Teleogryllus oceanicus}}
  
-Males of many crickets species use calling songs as sexual signals.  +Males of many crickets species use calling songs as sexual signals. Females locate and select singing males even in the dark of night, and can be very choosy in their mating preferences. This is indeed the norm in many populations of the Pacific field cricket, //Teleogryllus oceanicus//, but not in Hawaii, where there is a deadly enemy, the fly //Ormia ochracea//. This fly is a parasitoid that uses the cricket's song to find and lay larvae on the singing males. The larvae then find their way inside the bodies of the unfortunate singers and
-Females locate and select singing males even in the dark of +
-night, and can be very choosy in their mating preferences.  +
-This is indeed the norm in +
-many populations of the Pacific field cricket, //Teleogryllus +
-  oceanicus//, but not in Hawaii, where there is a deadly enemy, the fly +
-//Ormia ochracea//. This fly is a parasitoid that uses the cricket's song to find +
-and lay larvae on the singing males.  +
-The larvae then finds their way inside the bodies  +
-of the unfortunate singers and+
 feast on their internal tissues, eventually killing the host. feast on their internal tissues, eventually killing the host.
  
 {{   http://upload.wikimedia.org/wikipedia/commons/2/2c/Ormia_ochracea_%28gravid_female%29.jpg?200|Ormia ochracea}} {{   http://upload.wikimedia.org/wikipedia/commons/2/2c/Ormia_ochracea_%28gravid_female%29.jpg?200|Ormia ochracea}}
  
-In 2006 Marlene Zuk and collaborators documented the rapid spread of +In 2006 Marlene Zuk and collaborators documented the rapid spread of a silent male morph in a population of //Teleogryllus oceanicus// in Kauai Island, Hawaii ((Marlene Zuk, John T Rotenberry, and Robin M Tinghitella. [[http://rsbl.royalsocietypublishing.org/content/2/4/521.full.pdf+html | Silent night: adaptive disappearance of a sexual signal in a parasitized population of field crickets]]. Biology Letters, 2(4):521–524, 2006.)). The morph is called 'flatwings', as it lacks the wing structures used to produce songs. The change is caused by a single gene in the sexual chromosome of males ((RM Tinghitella. [[ http://www.nature.com/hdy/journal/v100/n3/pdf/6801069a.pdf | Rapid evolutionary change in a sexual signal: genetic control of the mutation ’flatwing’ that renders male field crickets (Teleogryllus oceanicus) mute]]. Heredity, 100(3):261–267, 2007.)). 
-a silent male morph in a population of //Teleogryllus +
-  oceanicus// in Kauai Island, Hawaii [1].  +
-The morph is called 'flatwings',  +
-as it lacks the wing structures used to produce songs.  +
-The change is caused by a single gene in the sexual chromosome +
-of males [2]. +
  
-Flatwing males escape from the parasitoid, but also are not found +Flatwing males escape from the parasitoid, but also are not found by females. Instead, they have a 'satellite' sexual behavior -- they attempt to mate with females that are attracted by calling males. Currently about 90% of the male crickets in Kauai were of the flatwing morph. This huge proportion of silent satellites 
-by females. Instead, they have a 'satellite' sexual behavior -- they +
-attempt to mate females that are attracted by calling males.  +
-Currently about 90% of the male crickets in Kauai were +
-of the flatwing morph. This huge proportion of silent satellites +
 rely on the few remaining singing males to reproduce.  rely on the few remaining singing males to reproduce. 
 +
 +{{ :2014:groups:g1:fliescrickets.gif |}}
  
 ==== Questions ==== ==== Questions ====
  
-This is a well-documented case of  persistence of a maladaptative +This is a well-documented case of  persistence of a maladaptative sexual character due to parasitoid pressure. The genetic, evolutionary and behavioral patterns are far more explored than the demographic and/or population
-sexual character due parasitoid pressure. The genetic, evolutionary and behavioral +
-patterns are far more explored than the demographic and/or population+
 genetics dynamics of the system. genetics dynamics of the system.
  
-The basic question is to propose a mathematical model that portrays this +The basic question is to propose a mathematical model that portrays this dynamic in a simple but biologically realistic way. Given that, you can investigate the dynamic behavior of the model, as well as check which values of the parameters ensue persistence of both morphs and the parasitoid in the long run. Further well-grounded insights are welcome.
-dynamic in a simple but biologically realistic way. Given that, you +
-can investigate the dynamic behavior of the model, as well as check +
-which values of the parameters ensue persistence of both morphs and +
-the parasitoid in the long run. Further well-grounded insights are welcome.+
  
  
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   * A key feature of this system is the inheritance mechanism of the flatwing gene.   * A key feature of this system is the inheritance mechanism of the flatwing gene.
   * Another key information is the degree of specialization of the parasitoid.   * Another key information is the degree of specialization of the parasitoid.
-  * The published information about the system provides plenty of useful biological information. It was mainly produced by a single research group, so it is coherent and  well circumscribed, and can be fully appreciated. +  * The published literature about the system provides plenty of useful biological information. It was mainly produced by a single research group, so it is coherent and  well circumscribed, and can be fully appreciated. 
  
 ==== References ==== ==== References ====
- + 
-  - Marlene Zuk, John T Rotenberry, and Robin M Tinghitella. [[http://rsbl.royalsocietypublishing.org/content/2/4/521.full.pdf+html | Silent night: adaptive disappearance of a sexual signal in a parasitized population of field crickets]]. Biology Letters, 2(4):521–524, 2006.  +
-  - RM Tinghitella. [[ http://www.nature.com/hdy/journal/v100/n3/pdf/6801069a.pdf | Rapid evolutionary change in a sexual signal: genetic control of the mutation ’flatwing’ that renders male field crickets (Teleogryllus oceanicus) mute]]. Heredity, 100(3):261–267, 2007.+
2014/groups/g1/start.1391074918.txt.gz · Last modified: 2024/01/09 18:45 (external edit)