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Sequential hermaphroditism occurs when an organism changes sex at some point in its life. It’s seen in a few species of gastropods and plants, but mostly fish, like napoleon wrasse, clownfish, groupers and marine angelfish. This transformation involves the complete restructuring of their gonads, as well as changes in their morphology and behaviour. For these fish, sex change is a usual part in their life cycle, and it’s one that carries adaptive advantages.
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All images and videos used herein are 1) in the public domain, 2) used under a Creative Commons license, 3) used with a license, or 4) used under the parameters of Fair Use law.
References:
Avise JC & Mank JE. Evolutionary perspectives on hermaphroditism in fishes. Sex Dev 2009;3:152–163.
Berglund A. Sequential hermaphroditism and the size-advantage hypothesis: an experimental test. Anim Behav 1990;30:426–433.
Todd EV, et al. Bending genders: the biology of natural sex change in fish. Sex Dev 2016;10:223–241.
Casas L, et al. Sex change in clownfish: molecular insights from transcriptome analysis. Sci Rep 2016;6:35461.
Goikoetxea A, et al. Stress and sex: does cortisol mediate sex change in fish? Reproduction 2017;154:R149–R160.
Kazancioğlu E & Alonzo SH. Costs of changing sex do not explain why sequential hermaphroditism is rare. Am Nat 2009;173:327–336.
Waples RS, et al. Consequences of sex change for effective population size. Proc Biol Sci 2018;285:20181702.
Muñoz RC & Warner RR. A new version of the size-advantage hypothesis for sex change: incorporating sperm competition and size-fecundity skew. Am Nat 2003;161:749–761.
Credits:
ふうけ. https://commons.wikimedia.org/....wiki/File:Kobudai150
prilfish. https://www.flickr.com/photos/....silkebaron/232002459
Rickard Zerpe. https://commons.wikimedia.org/....wiki/File:Orange_sku
Sasuke Tsujita. https://www.youtube.com/watch?v=GD2-ZZsWBYs&ab_channel=SasukeTsujita
フリッパーダイブセンター 群馬県伊勢崎市のダイビングショップ FLIPPER dive center. https://www.youtube.com/watch?v=-5YLywPkUjM&ab_channel=%E3%83%95%E3%83%AA%E3%83%83%E3%83%91%E3%83%BC%E3%83%80%E3%82%A4%E3%83%96%E3%82%BB%E3%83%B3%E3%82%BF%E3%83%BC%E7%BE%A4%E9%A6%AC%E7%9C%8C%E4%BC%8A%E5%8B%A2%E5%B4%8E%E5%B8%82%E3%81%AE%E3%83%80%E3%82%A4%E3%83%93%E3%83%B3%E3%82%B0%E3%82%B7%E3%83%A7%E3%83%83%E3%83%97FLIPPERdivecenter
https://www.youtube.com/watch?v=4sr7rPhfWCc&ab_channel=SCUBADIVINGPRO-SHOPMAHI-MAHI
Rickard Zerpe. https://commons.wikimedia.org/....wiki/File:Yellow_clo
Carl Malamud. https://commons.wikimedia.org/....wiki/File:Yellow_Gob
Rickard Zerpe.
https://www.flickr.com/photos/....krokodiver/238064296
alif_abdulrahman. https://www.flickr.com/photos/....alif_abdulrahman/188
aquarist.me. https://www.flickr.com/photos/....aquarist/7075443335/
Christian Gloor. https://www.flickr.com/photos/....christian_gloor/3020
Christian Gloor. https://www.flickr.com/photos/....christian_gloor/3150
#sexchangingfish #sexchange #naturalselection #hermaphroditism #sequentialhermaphroditism #hermaphrodite #biology #evolutionarybiology #zoology #clownfish #kobudai #asiansheepshead
Uhem Mesut, le renouvellement des naissances: http://uhem-mesut.com/
Hommage au Pr Théophile OBENGA-ECHANGES AVEC LES MEDIAS
SARS (Special Anti Robbery Squad) is a unit in Nigeria that is killing peaceful protesters in Nigeria. Please lend your voice every retweet’s, post and donation will help to end the on going genocide in Nigeria.
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The story of how our Earth was formed 4.5 billion years ago, told from the perspective of an asteroid called Bennu (which has survived until now). NASA sent a satellite to study Bennu to help us learn more about the beginning of our solar system.
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Immediately Enroll in Dr. Oba T'Shaka’s Free Six-Fold Stages of Mental Freedom 6-Day Video eCourse https://goo.gl/mVNzhC
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Dr. T’Shaka is a warrior scholar, renowned public speaker, professor, workshop leader, author, leader, organizer and visionary of exceptional influence who addresses audiences in the United States, Britain, France, Rotterdam and Africa.
For 38 years Dr. T’Shaka was a Professor at San Francisco State University, where he is now Professor Emeritus. Dr. Nathan Hare says, “Oba T’Shaka (is) one of the key social philosophers in the Afro-American race today.” The late Dr. Asa Hilliard, a great educator and scholar said of Dr. Oba T’Shaka, “he is one of the most powerful deep thinkers in the world today.
RELATED:
Introducing the Six-Fold Stages of Mental Freedom with Dr. Oba T'Shaka and Professor Kaba Hiawatha Kamene http://bit.ly/2NmaGud
Oba T'Shaka talks PTSS, Vacant Esteem vs. Post 1968 Hostile Forces https://goo.gl/zqyJ1z
Dr. Oba T'Shaka Shares His Private Study with Philippe SHOCK Matthews https://goo.gl/Ls8zqK
#KemeticConversations - Dr. Oba T'Shaka's Birthday Remarks and Thanks https://goo.gl/rvae69
The Role of Religions in the African Slave Trade: Ancient and Modern Featuring: Dr. Leonard Jeffries, Dr. Oba T’Shaka and Professor Kaba Hiawatha Kamene http://bit.ly/2Di7ri3
#ObaTShaka
The Impact Of Malcolm X On Our Lives And Our Work
Brought to you by: Dr. Oba T'Shaka’s Free Six-Fold Stages of Mental Freedom 6-Day Video eCourse https://goo.gl/mVNzhC
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SONIA SANCHEZ, DANNY GLOVER, EMORY DOUGLAS, DR. MELINA ABDULLAH AND OBA T’SHAKA
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SONIC ACTS FESTIVAL 2019 – HEREAFTER
Filipa César, Jin Mustafa – Meteorisations: Reading Amílcar Cabral's Agro-Poetics of Liberation
24 February – De Brakke Grond, Amsterdam, The Netherlands
A reading of Amílcar Cabral’s agronomic writings exposes substrata of a syntax for liberation later performed in guerrilla language and the struggle against Portuguese colonialism in Guinea-Bissau and Cape Verde. This visual and sonic reading explores the definitions of soil and erosion that Cabral developed as an agronomist, as well as his reports on colonial land exploitation and analysis of the trade economy, to unearth his double agency as a state soil scientist and as a ‘seeder’ of African liberation. Cabral understood agronomy not merely as a discipline combining geology, soil science, agriculture, biology and economics but as a means to gain materialist and situated knowledge about peoples’ lived conditions under colonialism. The scientific data he generated during his work as an agronomist, along with his poetry, were critical to his theoretical arguments in which he denounced the injustices perpetrated on colonised land, and it later informed his warfare strategies.
Cabral used his role as an agronomist for the Portuguese colonial government subversively to further anti-colonial struggle. Cabral’s process of decolonisation was understood as a project of soil reclamation and national reconstruction in the postcolony. His agency as an agronaut ventures through soil cosmologies, mesologies, meteorisations, ‘atmos-lithos’ conflict zones, celluloid compost, violence of imperial consumption — the sugar question. Humble derives from Humus.
Performative lecture by Filipa César with sound by Jin Mustafa and images from Sana na N’Hada and Flora Gomes, 1974, Cape Verde.
This iteration of the lecture has been commissioned by Sonic Acts as a part of Re-Imagine Europe, co-funded by the Creative Europe programme of the European Union.
Filipa César is an artist and filmmaker interested in the porous boundaries between the moving image and its reception, the fictional dimensions of the documentary and the economies, politics and poetics inherent to cinema praxis. Characterised by rigorous structural and lyrical elements, her multiform meditations often focus on Portuguese colonialism and the liberation of Guinea-Bissau in the 1960s and 1970s. This research developed into the collective project Luta ca caba inda (The Struggle Is Not Yet Over). She gained an MA Art in Context at the University of Arts, Berlin. Selected exhibitions and screenings include at the São Paulo Biennial, Manifesta 8, Cartagena, and the Contour 8 Biennial in Mechelen, Belgium, and Gasworks, London. Festival screenings include the Kurzfilmtage Oberhausen, Curtas Vila do Conde, Forum Expanded at the Berlinale and the International Film Festival Rotterdam.
Jin Mustafa is a Stockholm-based visual artist, DJ and electronic music producer. Her work shifts between media, often taking the form of moving images, objects, sound and music. She is interested in the relationship between technology, imaginary spaces and questions of personal and collective memory. Recent exhibitions include I’m fine, on my way home now at Mossutställningar, Stockholm (2017); Ripple at Alta Art Space in collaboration with Signal, Malmö; If she wanted I would have been there once, twice or again at Zeller Van Almsick Gallery, Vienna; and a collaborative work with Natália Rebelo for Chart Emerging at Kunsthal Charlottenborg, Copenhagen (2018).
Exploring the Sorghum Value Chain in Kenya under UniBrain.
