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Facilitative and inhibitory interactions among estuarine meiobenthic harpacticoid copepods
OLR (1988) 35 (6)
E. Biological Oceanography
88:3554 Brethes, J.-C.F., Francis Coulombe, P.-E. Lafleur and Roxane Bouchard, 1987. Habitat and spatial distribution of early benthic stages of the snow crab Chionoecetes opilio O. Fabricius off the north shore of the Gulf of St. Lawrence. J. crustacean Biol., 7(4):667-681. Dept. d'oceanogr., Univ. du Quebec, Rimouski, PQ G5L 3A1, Canada.
88:3555 Brinton, Edward, 1987. A new abyssal euphausiid, Thysanopoda m/nyops, with comparisons of eye size, photophores, and associated structures among deep-living species. J. crustacean Biol., 7(4):636-666. Scripps Inst. of Oceanogr., La Jolla, CA 92093, USA. 88:3556 Bruce, A.J., 1987. The occurrence of an Indo-west Pacific shrimp, Ailopontonia iaini Bruce, in Mexican waters (Decapoda, Palaemonidae). Crustaceana, 53(3):306-307. Northern Territory Mus., Darwin, 5794 Australia. 88:3557 Bruce, A.J., 1987. Onycocaridites anomodactylus, new genus, new species (Decapoda: Palaemonidae), a commensal shrimp from the Arafura Sea. J. crustacean Biol., 7(4):771-779. Div. of Nat. Sci., Northern Territory Mus., P.O. Box 4646, Darwin, NT 5794, Australia. 88:3558 Brusca, R.C. and J.R. Weinberg, 1987. A new isopod crustacean from Pacific Panama, Exdrolana chamensis new species (lsopoda: Flabellifera: Cirolanidae). Contr. Sci., nat. Hist. Mus. Los Angeles, 392:11-17. Invertebrate Zool. Section, Nat. Hist. Mus., 900 Exposition Blvd., Los Angeles, CA 90007, USA. 88:3559 Bucklin, Ann, R.R. Wilson Jr. and K.L. Smith Jr., 1987. Genetic differentiation of seamount and basin populations of the deep-sea amphipod Eurythenes grylins. Deep-Sea Res., 34(11A): 1795-1810.
Population genetic techniques are used to describe the genetic structure and estimate migration rates of E. gryllus from allozymic frequencies in basin and seamount samples. Genetic differential of crest populations may be explained by either strong differential selection, causing genetic divergence from basin populations or rarity of dispersal and interbreeding. If the latter is true (as seems more
567
probable), dispersal of E. gryllus is predominantly horizontal, and there may be a seamount form that is genetically, and perhaps taxonomically, distinct from the basin form. Scripps Inst. of Oceanogr., La Jolla, CA 92093, USA. 88:3560 Chandler, G.T. and J.W. Fleeger, 1987. Facilitative and inhibitory interactions among estuarine meiobenthic harpacticoid copepods. Ecology, 68(6): 1906-1919.
Monospecific patches of Pseudostenhelia wellsi and Scottolana canadensis (dominant species in the meiofaunal communities of Louisiana estuaries) were generated in laboratory microcosms to determine if the life history and sedimentary effects of either species influence colonization by two other burrowing harpacticoids, Nitocra lacustris and Cletocamptus deitersi. P. wellsi tube patches facilitated colonization by S. canadensis and N. lacustris but strongly inhibited C. deitersi colonization. S. canadensis patches were unattractive to N. lacustris. Mechanisms of P. wellsi facilitation were also studied. Belle W. Baruch Inst. for Mar. Biol. and Coastal Res., Univ. of South Carolina, Columbia, SC 29208, USA. 88:3561 Christy, J.H., 1987. Female choice and the breeding behavior of the fiddler crab Uca beehei. J. crustacean Biol., 7(4):624-635. Smithsonian Tropical Res. Inst., AP 2072, Balboa, Republic of Panama.
88:3562 Dahl, Erik, 1987. Malacostraca maltreated---the case of the Phyllocarida. J. crustacean Biol., 7(4):721726.
Because of the presence in the Phyllocarida of foliaceous thoracopods engaged in forward-directed ventral food transport, Schram (1986) removed the Phyllocarida from the Malacostraca and placed them in his class PhyUopoda. A reevaluation of the prevalence of malacostracan synapomorphies in the Phyllocarida proves beyond doubt their clearly malacostracan affinities. The placing of the Phyllocarida among the Phyllopoda involves Schram in difficulties, forcing him to build upon unwarranted hypotheses of 'loss' and 'redevelopment' of various characters and materially reducing the degree of clarity and credibility of his most important phylogenetic cladogram. Dept. of Zool., Univ. of Lund, Helgonavagen 3, S-223 62 Lund, Sweden.
E. Biological Oceanography
88:3554 Brethes, J.-C.F., Francis Coulombe, P.-E. Lafleur and Roxane Bouchard, 1987. Habitat and spatial distribution of early benthic stages of the snow crab Chionoecetes opilio O. Fabricius off the north shore of the Gulf of St. Lawrence. J. crustacean Biol., 7(4):667-681. Dept. d'oceanogr., Univ. du Quebec, Rimouski, PQ G5L 3A1, Canada.
88:3555 Brinton, Edward, 1987. A new abyssal euphausiid, Thysanopoda m/nyops, with comparisons of eye size, photophores, and associated structures among deep-living species. J. crustacean Biol., 7(4):636-666. Scripps Inst. of Oceanogr., La Jolla, CA 92093, USA. 88:3556 Bruce, A.J., 1987. The occurrence of an Indo-west Pacific shrimp, Ailopontonia iaini Bruce, in Mexican waters (Decapoda, Palaemonidae). Crustaceana, 53(3):306-307. Northern Territory Mus., Darwin, 5794 Australia. 88:3557 Bruce, A.J., 1987. Onycocaridites anomodactylus, new genus, new species (Decapoda: Palaemonidae), a commensal shrimp from the Arafura Sea. J. crustacean Biol., 7(4):771-779. Div. of Nat. Sci., Northern Territory Mus., P.O. Box 4646, Darwin, NT 5794, Australia. 88:3558 Brusca, R.C. and J.R. Weinberg, 1987. A new isopod crustacean from Pacific Panama, Exdrolana chamensis new species (lsopoda: Flabellifera: Cirolanidae). Contr. Sci., nat. Hist. Mus. Los Angeles, 392:11-17. Invertebrate Zool. Section, Nat. Hist. Mus., 900 Exposition Blvd., Los Angeles, CA 90007, USA. 88:3559 Bucklin, Ann, R.R. Wilson Jr. and K.L. Smith Jr., 1987. Genetic differentiation of seamount and basin populations of the deep-sea amphipod Eurythenes grylins. Deep-Sea Res., 34(11A): 1795-1810.
Population genetic techniques are used to describe the genetic structure and estimate migration rates of E. gryllus from allozymic frequencies in basin and seamount samples. Genetic differential of crest populations may be explained by either strong differential selection, causing genetic divergence from basin populations or rarity of dispersal and interbreeding. If the latter is true (as seems more
567
probable), dispersal of E. gryllus is predominantly horizontal, and there may be a seamount form that is genetically, and perhaps taxonomically, distinct from the basin form. Scripps Inst. of Oceanogr., La Jolla, CA 92093, USA. 88:3560 Chandler, G.T. and J.W. Fleeger, 1987. Facilitative and inhibitory interactions among estuarine meiobenthic harpacticoid copepods. Ecology, 68(6): 1906-1919.
Monospecific patches of Pseudostenhelia wellsi and Scottolana canadensis (dominant species in the meiofaunal communities of Louisiana estuaries) were generated in laboratory microcosms to determine if the life history and sedimentary effects of either species influence colonization by two other burrowing harpacticoids, Nitocra lacustris and Cletocamptus deitersi. P. wellsi tube patches facilitated colonization by S. canadensis and N. lacustris but strongly inhibited C. deitersi colonization. S. canadensis patches were unattractive to N. lacustris. Mechanisms of P. wellsi facilitation were also studied. Belle W. Baruch Inst. for Mar. Biol. and Coastal Res., Univ. of South Carolina, Columbia, SC 29208, USA. 88:3561 Christy, J.H., 1987. Female choice and the breeding behavior of the fiddler crab Uca beehei. J. crustacean Biol., 7(4):624-635. Smithsonian Tropical Res. Inst., AP 2072, Balboa, Republic of Panama.
88:3562 Dahl, Erik, 1987. Malacostraca maltreated---the case of the Phyllocarida. J. crustacean Biol., 7(4):721726.
Because of the presence in the Phyllocarida of foliaceous thoracopods engaged in forward-directed ventral food transport, Schram (1986) removed the Phyllocarida from the Malacostraca and placed them in his class PhyUopoda. A reevaluation of the prevalence of malacostracan synapomorphies in the Phyllocarida proves beyond doubt their clearly malacostracan affinities. The placing of the Phyllocarida among the Phyllopoda involves Schram in difficulties, forcing him to build upon unwarranted hypotheses of 'loss' and 'redevelopment' of various characters and materially reducing the degree of clarity and credibility of his most important phylogenetic cladogram. Dept. of Zool., Univ. of Lund, Helgonavagen 3, S-223 62 Lund, Sweden.