caa a22 4500 469098139 CHVBK 20180323133037.0 cr unu---uuuuu 170328e19920801xx s 000 0 eng 10.1007/BF00317786 doi (NATIONALLICENCE)springer-10.1007/BF00317786 Causes of a non-random pairing by size in the brine shrimp, Artemia salina [Elektronische Daten] (Crustacea: Anostraca) [M. Forbes, H. Pagola, R. Baker] Summary: Brine shrimp (Artemia salina) males and females entered precopula assortatively by size in the laboratory; large males also had a pairing advantage over smaller males. We investigated the causes of such nonrandom pairing to test hypotheses on size-assortative mating. We found precopulatory biases with respect to male size in the absence of direct competition among males (which produces pairing biases in other species). Large males encountered females significantly more often than did small males. Similarly, large females encountered males more often than did small females, but showed less ‘willingness' than small females to enter precopula when housed with small males. Consequently, large females took longer than small females to enter precopula with small males. Although large males entered precopula readily with small females, such size-mismatched pairs appeared short-lived. We conclude that non-random pairing by size in A. salina is determined by several factors including: encounter rates between males and females of different sizes, female behavior, and time following initial pair formation. Our results are likely applicable to other species and can help explain variation for selection on size or other traits. Springer-Verlag, 1992 Artemia salina nationallicence Size advantage nationallicence Size-assortative pairing nationallicence Encounter rates nationallicence Reproductive success nationallicence Forbes M. Department Zoology, Erindale College, University of Toronto, L5L 1C6, Mississauga, Ontario, Canada aut Pagola H. Department Zoology, Erindale College, University of Toronto, L5L 1C6, Mississauga, Ontario, Canada aut Baker R. Department Zoology, Erindale College, University of Toronto, L5L 1C6, Mississauga, Ontario, Canada aut Oecologia Springer-Verlag 91/2(1992-08-01), 214-219 0029-8549 91:2<214 1992 91 442 https://doi.org/10.1007/BF00317786 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00317786 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Forbes M. Department Zoology, Erindale College, University of Toronto, L5L 1C6, Mississauga, Ontario, Canada aut NATIONALLICENCE 700 1- Pagola H. Department Zoology, Erindale College, University of Toronto, L5L 1C6, Mississauga, Ontario, Canada aut NATIONALLICENCE 700 1- Baker R. Department Zoology, Erindale College, University of Toronto, L5L 1C6, Mississauga, Ontario, Canada aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 91/2(1992-08-01), 214-219 0029-8549 91:2<214 1992 91 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer