@article {274,
	title = {Why Are There No Reports Of Eusocial Marine Crustaceans},
	journal = {Oikos},
	volume = {67},
	number = {3},
	year = {1993},
	month = {Sep},
	pages = {573-577},
	abstract = {Eusociality, a social system characterized by colonial living, extended parental care, a few reproducing individuals and functionally sterile worker castes, has been described in terrestrial arthropod species such as ants, bees and termites, and even in mammals, but no such observations have been reported in the marine arthropods. In this paper we explore the possible ecological and life history traits of certain marine arthropods which may predispose them to eusocial behavior. Our goal is to point out the possibility of the presence of eusocial marine forms, and to urge marine biologists to look for them.},
	url = {<Go to ISI>://A1993LN44900020},
	author = {Spanier, E. and Cobb, J. S. and James, M. J.}
}
@article {386,
	title = {Divergence In Proteins, Mitochondrial-Dna, And Reproductive Compatibility Across The Isthmus Of Panama},
	journal = {Science},
	volume = {260},
	number = {5114},
	year = {1993},
	note = {0036-8075},
	month = {Jun 11},
	pages = {1629-1632},
	abstract = {It is widely believed that gene flow connected many shallow water populations of the Caribbean and eastern Pacific until the Panama seaway closed 3.0 to 3.5 million years ago. Measurements of biochemical and reproductive divergence for seven closely related, transisthmian pairs of snapping shrimps (Alpheus) indicate, however, that isolation was staggered rather than simultaneous. The four least divergent pairs provide the best estimate for rates of molecular divergence and speciation. Ecological, genetic, and geological data suggest that gene flow was disrupted for the remaining three pairs by environmental change several million years before the land barrier was complete.},
	url = {<Go to ISI>://A1993LG17600023},
	author = {Knowlton, N. and Weigt, L. A. and Solorzano, L. A. and Mills, D. K. and Bermingham, E.}
}
@article {372,
	title = {Genetic Population-Structure In 2 Tropical Sponge-Dwelling Shrimps That Differ In Dispersal Potential},
	journal = {Marine Biology},
	volume = {116},
	number = {3},
	year = {1993},
	note = {0025-3162},
	month = {Jul},
	pages = {459-470},
	abstract = {The spatial context in which {\textquoteright}{\textquoteright}host races{\textquoteright}{\textquoteright} of parasitic animals originate is a central issue in the controversial theory of sympatric speciation. Sponge-dwelling shrimps in the genus Synalpheus provide a good system for evaluating the possibility of resource-associated divergence in sympatry. I used allozyme electrophoresis to assess the genetic population structure of two Caribbean Synalpheus species sampled in 1988 to 1990 at a hierarchy of spatial scales. S. brooksi Coutiere is a host-generalist, using several sponge species in an area, and develops directly, with no planktonic larval stage. G-tests and estimates of F(ST) revealed highly structured populations in this species, with significant differentiation among samples from individual reefs within a region, and strong divergence among regions (Panama, Belize, Florida). Moreover, samples of S. brooksi taken from the two sponges Spheciospongia vesparium (Lamarck) and Agelas clathrodes (Schmidt) in Panama, and separated by less-than-or-equal-to 3 km, showed significant differentiation at both of the loci that were polymorphic in these populations. Genetic distances between these host-associated populations averaged > 60\% greater than distances between samples from the same host species and were comparable to, or greater than, those for some inter-regional comparisons. These genetic data corroborate a previous finding of demographic differences between the same populations. The second species, S. pectiniger Coutiere, occurs only in Spheciospongia vesparium, and produces swimming larvae. Although allele frequencies in this species differed significantly among the three regions, S. pectiniger showed no differentiation within regions, and significantly lower differentiation (F(ST)) among regions than its direct-developing congener. These data suggest that genetic population structure in these two commensal crustaceans is related to dispersal potential, and that restricted dispersal may allow the divergence of host-associated populations on a local scale.},
	url = {<Go to ISI>://A1993LN99800013},
	author = {Duffy, J. E.}
}
@inbook {542,
	title = {Crustaceos Decapodos del Pacifico Mexicano},
	booktitle = {Biodiversidad marina y costera de Mexico},
	year = {1993},
	pages = {271-318},
	publisher = {Com. Nal. Biodiversidad y CIQRO},
	organization = {Com. Nal. Biodiversidad y CIQRO},
	address = {Mexico},
	author = {Hendrickx, M. E.},
	editor = {Salazar-Vallejo, S.I. and Gonzalez, N. E.}
}
@inbook {298,
	title = {Sibling species in the sea},
	booktitle = {Fautin, D. G.: Ed. Annual Review of Ecology and Systematics. 24. 1993. 189-216.},
	year = {1993},
	note = {Book. Literature Review.0066-4162English},
	publisher = {Annual Reviews Inc., P.O. Box 10139, 4139 El Camino Way, Palo Alto, California 94306},
	organization = {Annual Reviews Inc., P.O. Box 10139, 4139 El Camino Way, Palo Alto, California 94306},
	abstract = {Abstract: Sibling species are common in all major marine groups and habitats. Their abundance reflects both inadequate study of morphological features of living organisms ({\textquoteright}{\textquoteright}pseudo-sibling species{\textquoteright}{\textquoteright}) and divergence in habitat, life history, and chemical recognition systems without parallel divergence in morphology. Many marine sibling species are quite distinct genetically. Others, however, exhibit slight genetic differences whose significance is only clear in sympatry and in combination with other subtle but concordant patterns of differentiation. A large number of abundant, well-studied, or economically important taxa have recently been shown to be complexes of sibling species. The broad habitat and geographic distributions characteristic of many marine species require reevaluation in this context.},
	keywords = {Animalia, animals, book chapter, Comparative and Experimental Morphology, cryptic species, Ecology, Ecology (Environmental Sciences), Environmental Biology/Animal [07508], Environmental Biology/Oceanography [07512], Environmental Sciences), Evolution [01500], Evolution and Adaptation, General Biology/Taxonomy, General Life Studies, Invertebrata, Invertebrata - Unspecified: Invertebrata, Invertebrata (Invertebrata - Unspecified), Invertebrata-Unspecified [34000], invertebrate (Invertebrata - Unspecified), Invertebrates, marine, Marine Ecology (Ecology, Nomenclature and Terminology [00504], Physiology, Physiology and Pathology/General [64001], speciation, taxonomy},
	author = {Knowlton, Nancy}
}
