Evolution and Maintenance of Sexual Reproduction

Ediriweera, C. and S.C. Weeks. (In press). Delineating the W sex chromosome in the clam shrimp, Eulimnadia texana. Cytogenetic and Genomic Research (in press).

Lang, C., C. Ediriweera and S.C. Weeks. 2024. Sex chromosome evolution in the clam shrimp Eulimnadia texana. Invertebrate Biology 143:e12426. doi.org/10.1111/ivb.12426.

Calabrese, A. and S.C. Weeks. 2022. Testing a behavioral model for the maintenance of androdioecy as a result of sexual conflict in the clam shrimp Eulimnadia dahli. Ethology 128:331-338

Astrop, T.I., L. Park-Boush and S.C. Weeks. 2020. Testing Weissman’s lineage selection model for the maintenance of sex: The evolutionary dynamics of clam shrimp reproduction over geologic time. Zoological Studies 59:16.

Calabrese, A. and S.C. Weeks. 2018. Are all-hermaphroditic populations of Eulimnadia

texana Packard, 1871 (Branchiopoda: Spinicaudata) resistant to invasion? Implications for the maintenance of androdioecy. Journal of Crustacean Biology (in press).

Baldwin-Brown, J.G., S.C. Weeks and A.D. Long. 2018. A new standard for crustacean genomes: the highly contiguous, annotated genome assembly of the clam shrimp Eulimnadia texana reveals HOX gene order and identifies the sex chromosome. Genome Biology and Evolution 10:143-156. (Also noted inBioRxiv doi: https://doi.org/10.1101/222869)

Weeks, SC, C. Benvenuto, SK Reed, RJ Duff, and ZH Duan. 2014. A field test of a model for the stability of androdioecy in the freshwater shrimp, Eulimnadia texana. Journal of Evolutionary Biology 41:251-261.

Weeks, SC, JS Brantner, TI Astrop, DW Ott and N Rabet. 2014. The evolution of hermaphroditism from dioecy in crustaceans: Selfing hermaphroditism described in a fourth Spinicaudatan genus. Evolutionary Biology 41:251-261. DOI 10.1007/s11692-013-9265-0.

Brantner, J. S. , D. W. Ott, R. J. Duff, L-O Sanoamuang, GP Simhachalam, KK Subhash Babu, and SC Weeks. 2013. Androdioecy and Hermaphroditism in Five Species of Clam shrimp (Crustacea: Branchiopoda: Spinicaudata) From India and Thailand. Invert. Biol. 132:27-37.

Brantner, J. S. , D. W. Ott, R. J. Duff, J.I. Orridge, J. R. Waldman and S.C. Weeks. 2013. Evidence of selfing hermaphroditism in the clam shrimp Cyzicus gynecia (Branchiopoda, Spinicaudata). J. Crust. Biol. 33:184-190.

Weeks, S.C. 2012. The role of androdioecy and gynodioecy in mediating evolutionary transitions between dioecy and hermaphroditism in the Animalia. Evolution 66:3670-3686

Weeks, SC, C Benvenuto, TF Sanderson, and RJ Duff. 2010. Sex Chromosome Evolution in the Clam Shrimp, Eulimnadia texana. J. Evol. Biol. 23:1100-1106.

Weeks, SC, EG Chapman, DC Rogers, DM Senyo, and WR Hoeh. 2009. Evolutionary transitions among dioecy, androdioecy and hermaphroditism in limnadiid clam shrimp (Branchiopoda: Spinicaudata). J. Evol. Biol. 22:1781-1799.

Weeks, SC, SK Reed, DW Ott, and F. Scanabissi. 2009. Inbreeding effects on sperm production in clam shrimp (Eulimnadia texana). Evol. Ecol. Res. 11:125-134.

Weeks, SC. 2009. Can males successfully invade hermaphroditic populations of clam shrimp (Eulimnadia texana)? Current Science 96:98-102.

Weeks SC, TF Sanderson, M Zofkova, and B Knott. 2008. Breeding systems in the clam shrimp family Limnadiidae. Invertebrate Biology 127:336-349.

Weeks SC, SK Reed, M Cesari, and F Scanabissi. 2006. Production of intersexes and the evolution of androdioecy in the clam shrimp Eulimnadia texana (Crustacea, Branchiopoda, Spinicaudata). Invertebrate Reproductive Development 49:113-119 .

Scanabissi F, M Cesari, SK Reed, SC Weeks. 2006.Ultrastructure of the male gonad and male gametogenesis in Eulimnadia texana (Packard, 1871)(Crustacea, Branchiopoda, Spinicaudata). Invertebrate Biology 125:117-124.

Weeks SC, C Benvenuto, and SK Reed. 2006. When males and hermaphrodites coexist: A review of androdioecy in animals. Integrative and Comparative Biology 46:449-464 (http://icb.oxfordjournals.org/cgi/content/abstract/icj048v1).

Weeks SC, TF Sanderson, SK Reed, M Zofkova, B Knott, U Balaraman, G Pereira, DM Senyo, WR Hoeh. 2006. Ancient Androdioecy in the Freshwater Crustacean Eulimnadia . Proceedings of the Royal Society of London, Series B 273:725-734.

Weeks, SC, RT Posgai, M Cesari, and F Scanabissi. 2005. Androdioecy inferred in the clam shrimp Eulimnadia agassizii (Spinicaudata: Limnadiidae). Journal of Crustacean Biology 25:323-328.

Weeks, SC. 2004. Seven generations of inbreeding does not purge inbreeding depression in the clam shrimp, Eulimnadia texana. Journal of Evolutionary Biology 17:475-484.

Weeks, SC and RL Bernhardt. 2004. Maintenance of androdioecy in the freshwater shrimp, Eulimnadia texana: Field estimates of inbreeding depression and relative male survival. Evolutionary Ecology Research 6:227-242.

Weeks SC, CL Marquette, and E Latsch. 2004. Barriers to outcrossing success in the primarily self-fertilizing clam shrimp, Eulimnadia texana (Crustacea, Branchiopoda). Invertebrate Biology 123:146-155.

Hollenbeck VG, N Zucker, W Gould and SC Weeks. 2002. Maintenance of androdioecy in the freshwater shrimp Eulimnadia texana: Sexual encounter rates and outcrossing success. Behavioral Ecology 13:561-570.

Weeks, SC, J Hutchison, and N Zucker. 2002. Maintenance of androdioecy in the freshwater shrimp, Eulimnadia texana: Do hermaphrodites need males for complete fertilization? Evolutionary Ecology 15:205-221.

Naida Zucker, Gabriela A. Aguilar, Stephen C. Weeks,  and L. Garner McCandless. 2002. Variation in reproductive cycle between selfing and outcrossing hermaphrodites in an androdioecious desert shrimp. Invertebrate Biology 121:66-72.

Zucker, N, B Stafki and SC Weeks. 2001. Maintenance of androdioecy in the freshwater shrimp, Eulimnadia texana: Relative longevity of males to hermaphrodites. Can. J. Zool. 79:393-401.

Medland, VL, N Zucker, and SC Weeks. 2000. Maintenance of androdioecy in the freshwater shrimp, Eulimnadia texana Parker: Encounters between males and hermaphrodites are not random. Ethology 106:839-848.

Gray, M and SC Weeks. 2001. A comparison of dietary use patterns of clonal and sexual fish (Poeciliidae: Poeciliopsis). Can. J. Fish. Aquat. Sci. 58:1313-1318.

Weeks, SC, BR Crosser, and MM Gray. 2001. Relative fitness of two hermaphroditic mating types in the androdioecious clam shrimp, Eulimnadia texana. Journal of Evolutionary Biology 14:83-94.

Weeks, SC, BR Crosser, B Bennett, MM Gray, and N Zucker. 2000. Maintenance of androdioecy in the freshwater shrimp, Eulimnadia texana: Variation in inbreeding depression between two populations.  Evolution 54:878-887.

Weeks, SC, BR Crosser, MM Gray, JA Matweyou, and N. Zucker. 2000. Is there Sperm Storage in the Clam Shrimp Eulimnadia texana? Invertebrate Biology 119:215-221.

Weeks, SC, and N Zucker. 1999. Rates of Inbreeding in the Clam Shrimp Eulimnadia texana. Can. J. Zool. 77:1402-1408.

Weeks, SC, V Marcus and B Crosser. 1999. Inbreeding Depression in a Self-Compatible, Androdioecious Crustacean, Eulimnadia texana. Evolution 53:472-483.

Weeks SC. 1996. A reevaluation of Red Queen model for the maintenance of sex in a clonal-sexual fish complex (Poeciliidae: Poeciliopsis). Canadian Journal of Fisheries and Aquatic Sciences 53:1157-1164.

Weeks SC. 1995. Comparisons of life-history traits between clonal and sexual fish (Poeciliopsis: Poeciliidae) raised in monoculture and mixed treatments. Evolutionary Ecology 9:258-274.

Weeks SC. 1993. The effects of recurrent clonal formation on clonal invasion patterns and sexual persistence: A Monte Carlo simulation of the frozen niche-variation model. The American Naturalist 141:409-427.

Weeks SC, OE Gaggiotti, R Schenck, K Spindler, and RC Vrijenhoek. 1992. Feeding behavior in sexual and clonal strains of Poeciliopsis. Behavioral Ecology and Sociobiology 30:1-6.

Weeks SC and C Sassaman . 1990. Competition in phenotypically variable and uniform populations of the tadpole shrimp Triops longicaudatus (Notostraca: Triopsidae). Oecologia 82:552-559.

Wetherington JD, SC Weeks, KE Kotora, and RC Vrijenhoek. 1989. Genotypic and environmental components of variation in growth and reproduction of fish hemiclones (Poeciliopsis: Poeciliidae). Evolution 43:635-645.