Polyandry Is Extremely Rare in the Firefly Squid, Watasenia Scintillans
bioRxiv preprint doi: https://doi.org/10.1101/2019.12.13.875062; this version posted December 13, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 1 Polyandry is extremely rare in the firefly squid, Watasenia scintillans 2 3 4 Noriyosi Satoa,b, Sei-Ichiro Tsudaa, Nur E Alam Mda, Tomohiro Sasanamic Yoko Iwatad, Satoshi 5 Kusamae, Osamu Inamurae, Masa-aki Yoshidaa, Noritaka Hirohashia,1 6 7 aOki Marine Biological Station, Shimane University, 194 Kamo, Okinoshima, Oki, Shimane 8 685-0024, Japan 9 bDepartment of Fisheries, School of Marine Science and Technology, Tokai University, 10 Shizuoka 424-8610, Japan 11 cDepartment of Applied Life Sciences, Faculty of Agriculture, Shizuoka University, 836 Ohya, 12 Shizuoka, Shizuoka 422-8529, Japan 13 dAtmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, 14 Kashiwa, Chiba 277-8564, Japan 15 eUozu aquarium, 1390 Sanga, Uozu, Toyama 937-0857, Japan 16 17 18 Abstract 19 Although polygamy has versatile benefits for both sexes, many species favor monogamy for 20 reasons with the clarity or unclarity. In cephalopods, all species are regarded to be polygamous, 21 which could be attributed to their common life-history traits. Contrary to this prediction, we show 22 empirical evidence for monogamy in the firefly squid, Watasenia scintillans. The peak spawning 23 season comes after male disappearance owning to long-reserved spermatangia deposited by 24 male at exact locations (bilateral pouches under neck collar) on female with a symmetric 25 distribution.
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