@article {366,
	title = {Host use patterns and demography in a guild of tropical sponge-dwelling shrimps},
	journal = {Marine Ecology-Progress Series},
	volume = {90},
	number = {2},
	year = {1992},
	note = {USA1992English},
	pages = {127-138},
	abstract = {Demographic consequences of the commensal lifestyle of shrimps Synalpheus spp. were assessed by sampling sponges and coral rubble on reefs in Caribbean Panama. Eight of 22 species were found solely or primarily within the internal canals of sponges. Among these sponge-dwellers, host specificity ranged from generation (occurrence in gtoreq 4 host species) to specialization on a single host species, and sponges used in the field were also preferreed in laboratory choice assays. Living in sponges had important consequences for shrimp populations. Parasitism by epicaridean isopods averaged 6 times higher in obligate sponge-dwellers (17\%) than in free-living species (2.5\%). Sponge species differed in the mean size and size range of habitable spaces they provide, number of potentially competing Synalpheus species they support, and vulnerability of associated shrimps to parasitism. Similarly, conspecific shrimp populations occupying different hosts differed demographically. Specifically, populations and Synalpheus brooksi in the sponge Spheciospongia vesparium were significantly less dense, less parasitized, had larger body sizes, and tended toward higher proportions of mature females than conspecifics in the co-occurring sponge Agelas clathrodes. High host specificity, regional variation in host use, and demographic and genetic differentiation among conspecific shrimps in different host species suggest that the commensal lifestyle has pervasive, and potentially evolutionarily important, consequences for the population biology of this diverse group of shrimps.},
	keywords = {Agelas clathrodes (Porifera), Animalia, animals, Arthropoda, Arthropods, Comparative and Experimental Morphology, Crustaceans, Ecology, Ecology (Environmental Sciences), Environmental Biology/Animal [07508], Environmental Biology/Oceanography [07512], Environmental Sciences), Evolution [01500], Evolution and Adaptation, Genetics, Genetics and Cytogenetics/Animal [03506], Genetics and Cytogenetics/Population Genetics (1972- ) [03509], Invertebrata, Invertebrates, Malacostraca: Crustacea, Marine Ecology (Ecology, Neotropical region), Panama (Central America, Physiology, Physiology and Pathology/Arthropoda-Crustacea [64054], Physiology and Pathology/Porifera [64006], Population Genetics (Population Studies), Porifera [39000], Porifera: Invertebrata, Spheciospongia vesparium (Organisms - Unspecified), sponge (Porifera), Synalpheus brooksi (Malacostraca), Synalpheus spp. (Malacostraca)},
	author = {Duffy, J. E.}
}
@article {344,
	title = {Multiple origins of eusociality among sponge-dwelling shrimps (Synalpheus)},
	journal = {Evolution},
	volume = {54},
	number = {2},
	year = {2000},
	note = {Article.0014-3820English},
	month = {April},
	pages = {503-516},
	abstract = {As the most extreme expression of apparent altruism in nature, eusociality has long posed a central paradox for behavioral and evolutionary ecology. Because eusociality has arisen rarely among animals, understanding the selective pressures important in early stages of its evolution remains elusive. Employing a historical approach to this problem, we used morphology and DNA sequences to reconstruct the phylogeny of 13 species of sponge-dwelling shrimps (Synalpheus) with colony organization ranging from asocial pair-bonding through eusociality. We then used phylogenetically independent contrasts to test whether sociality was associated with evidence of enhanced competitive ability, as suggested by hypotheses invoking an advantage of cooperation in crowded habitats. The molecular, morphological, and combined data each strongly supported three independent origins of monogynous, multigenerational (eusocial) colony organization within this genus. Phylogenetically independent contrasts confirmed that highly social taxa, with strong reproductive skew, have significantly higher relative abundance within the host sponge than do less social taxa, a result that was robust to uncertainty in tree topology and varying models of character change. A similar tendency for highly social species to share their sponge with fewer congener species was suggestive, but not significant. Because unoccupied habitat appears to be limiting for many sponge-dwelling shrimp species, these data are consistent with hypotheses that cooperative social groups enjoy a competitive advantage over less organized groups or individuals, where independent establishment is difficult, and that enemy pressure is of central importance in the evolution of animal sociality.},
	keywords = {[01500] Evolution, [07003] Behavioral biology - Animal behavior, [07502] Ecology: environmental biology - General and methods, [64054] Invertebrata:comparative, [75112] Malacostraca, altruism, Animalia, Arthropoda, Arthropods, asocial pair-bonding, Behavior, colony organization: monogynous, Crustacea, Crustaceans, dna, eusociality, Evolution and Adaptation, experimental morphology, Invertebrata, Invertebrates, Malacostraca: Animals, Morphology, multigenerational, multiple origins, phylogeny, physiology and pathology - Arthropoda: crustacea, social evolution, Synalpheus [Malacostraca]},
	url = {file://localhost/Users/kristinhultgren/Desktop/Papers/Duffy_Morrison_Rios_2000.pdf},
	author = {Duffy, J. E. and Morrison, C. L. and Rios, Ruben}
}
