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The relative importance of predatory decapod crustaceans in sedimentary communities depends on the spatial variability in their abundance and composition. At the scale of a fjord, such spatial patterns could be related to sill-mediated larval supply. This study examines larval and adult distribution...
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The collapse of the cod fishery in Newfoundland has coincided with marked increases in abundances of snow crab, pandalid shrimp, and other crustaceans that prey on sedimentary infauna. A 3-year sampling program in Bonne Bay, Newfoundland indicates differences in composition and number of these preda...
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Seasonal sampling of sediments (May 1988-May 1989), carried out at two intertidal areas of the Queule River Estuary, was used to analyse the vertical distribution of the macroinfauna and sedimentological characteristics. In all seasons, the substratum characteristics of both areas showed small diffe...
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Naticid gastropod predators leave characteristic boreholes in the shells of their bivalve prey that allow the evaluation of spatial differences in occurrence and intensity of predation. This approach, extensively used in paleobiological research, was used to compare spatial variation in predation by...
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Given the logistical difficulties, cost, and time involved in species-level identifications, several authors have proposed the use of coarser taxonomic resolution (e.g. family, order) in studies of pollution. The use of surrogates instead of species relies on their sufficiency to detect community re...
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Two sandy beaches were studied in south - central Chile (ca., 39 degrees S), during 17 months to analyze the seasonal variability in population abundances and zonation of the most common species of the intertidal macroinfauna. The beaches displayed differences in mean grain size, Dean's parameter (a...
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This study explores the association of 24 polychaete species with sandy and muddy habitats located in a sub-arctic fjord, and across Atlantic Canada including Labrador, Newfoundland, and the Gulf of St. Lawrence. Key characters used to facilitate species identification are also summarized. Within Bo...
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The potential for predatory infaunal species to increase trophic complexity in marine sedimentary habitats has been debated in the past; however, the status of predatory infauna as a distinct trophic level remains controversial. Specifically, it is unclear whether these assemblages can be accurately...
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We studied the infestation of the burrowing polychaete Polydora rickettsi on the shells of Crepidula fecunda in relation to the degree of intertidal exposure in Yaldad Bay (Chile). 175 specimens of C.fecunda were collected from five stations located at tidal levels experiencing air exposures of 0, 2...
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The community structure of the intertidal and subtidal macroinfauna was studied at the littoral of northern Chile, a coast characterized by the frequency of upwelling. Thus, samplings were carried out at the coast of Antofagasta, Caldera and La Serena - Coquimbo. The community structure of the inter...
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The spatial and temporal variations of cyclic organochlorine compounds, heavy metals, total hydrocarbons, surfactants, oil and grease, BOD, (biochemical oxygen demand), dissolved oxygen and nutrients were measured during summer and winter of 1996 from the Valdivia municipal landfill and its surround...
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The temporal variability in abundance and population structure of the gastropod Chilina ovalis Sowerby was studied in the upper intertidal zone of Queule River estuary, south-central Chile (c. 40 degreesS). Snails were collected monthly (September 1995-December 1997) from haphazardly-located quadrat...
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The role of predation in structuring soft-sediment communities varies as a function of the number and composition of predators that co-occur in a given habitat. In Bonne Bay, Newfoundland, contrasting abundances or predators in different areas of the bay may contribute to different regulatory roles ...
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Eight sandy beaches were seasonally sampled along the coast of Chile, from ca. 21 to 42degrees S (about 3000 km) to study the relationship between community structure 2 of the intertidal macroinfauna and beach characteristics. Sediment samples (0.1 m(2), 30 cm deep) were collected (July-September 19...
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Ten sandy beaches along the coast of northern Chile (20-23 degreesS) were studied in December 1998, to examine the distribution, abundance, and habitat characteristics of the crab Ocypode gaudichaudii. Beach width. slope, and intertidal fringes were identified, and Dean's parameter, describing ...
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Field experiments (exclusion and inclusion of gastropods) were carried out in the intertidal of the Lingue River estuary (south-central Chile) during the summers of 1991 and 1992. Cages were used to analyze the effects of the snail Chilina ovalis Sowerby on the macroinfaunal community structure and ...
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The effect of recreational bench users on the abundance of the intertidal macroinfauna was studied on a sandy beach of southcentral Chile (ca. 39 degrees S) during the summer of 1992. A field experiment was conducted over a period of about two months. A fence was installed in the middle of the beach...
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Sediment samplings were carried across the intertidal of the beach at Hornitos, northern Chile (22 degrees 26'S) during August and November 1996 and March, July and November 1997 for a study of the reproductive and population biology of Emerita analoga (Stimpson) (Decapoda, Anomura) in a region of t...
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Samples were collected from September 1990 to February 1992, at three subtidal sites of the middle reaches of the Queule River estuary, southern Chile, to analyze the spatial and temporal variability of the macroinfauna inhabiting substrata with different abundances of bivalves. In addition, water a...
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Sediment samples were monthly collected at Queule river estuary (ca. 39 degrees S), south-central Chile, from October 1990 to April 1992, and from September 1995 to November 1997 to study temporal variability in population abundances of the macroinfauna inhabiting sandy and muddy-sand intertidal sub...
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The reproductive cycles of the bivalves Ensis macha (Molina, 1782), Tagelus dombeii (Lamarck, 1818), and Mulinia edulis (King, 183 1) were studied at six sites in southern Chile (38-43degreesS) from November 1996 to December 1997. Samples of E. macha came from three subtidal shallow depths; those of...