Journal ArticleDOI
Space partitioning and interactions in an intertidal sand-burrowing amphipod guild
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A nine-year study at a moderately exposed, fine sand intertidal beach at Long Sands, Maine, USA identified marked seasonal changes in the foci of sand-burrowing amphipod activities, including seasonal population movements, degree of interspecific horizontal overlap, life stage segregation within and between species, and sand depth stratification.Abstract:
A nine-year study at a moderately exposed, fine sand intertidal beach at Long Sands, Maine, USA identified marked seasonal changes in the foci of sand-burrowing amphipod activities. These included seasonal population movements, degree of interspecific horizontal overlap, life stage segregation within and between species, and sand depth stratification. Behavioral interactions related to competition for available space are considered important in affecting the distribution and abundance of amphipod species, and community structure. Significant negative correlations were shown between the abundance and upper distributional limits of the smaller, lower shore Acanthohaustorius millsi and the abundance of the larger, higher shore species Haustorius canadensis. Tolerance limits to a variety of prevailing physical factors alone, were not considered a serious obstacle to occupation of higher intertidal level sands by A. millsi. Summer brooding females of both species occupied similar 5 to 10 cm sand depths, but were strongly segregated horizontally. Laboratory coexistence experiments during the reproductive period showed increased mortality of adults and negligible reproductive output of A. millsi when in combination with H. canadensis compared to controls where the former species was alone. A third species, Amphiporeia virginiana, occupied primarily very shallow sand (0 to 2.5 cm), and performed seasonal movements opposite in direction to A. millsi and H. canadensis. The presence, amount, and refinement of biological interactions across the wave exposure gradient requires further study. Until then, we consider as inappropriate the blanket designation of all types of intertidal sand communities as “physically controlled”.read more
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Patterns, processes and regulatory mechanisms in sandy beach macrofauna: a multi-scale analysis
Omar Defeo,Anton McLachlan +1 more
TL;DR: This synthesis suggests that biological interactions are more important regu- latory agents than previously thought in benign dissipa- tive beaches or undisturbed sites, intra- and interspecific competition can be more intense than in reflective beach- es or disturbed sites, where the populations are physi- cally controlled.
Journal ArticleDOI
Competition and Predation in Marine Soft-Sediment Communities
TL;DR: It is argued that softsediment habitats are sufficiently different from other communities that different paradigms are needed, and paradigs of co~nmunity organization based on other habitats seem to offer little insight into the structure of marine soft-sediment communities.
BookDOI
Coastal marine ecosystems of Latin America.
Ulrich Seeliger,Björn Kjerfve +1 more
TL;DR: A summary of natural and human-induced variations in coastal marine ecosystems of Latin America can be found in this paper, where the authors present a detailed overview of the evolution of marine ecosystems in the region.
Journal Article
Community Structure and Intertidal Zonation of the Macroinfauna on the Atlantic Coast of Uruguay
TL;DR: In this article, the authors analyzed the species richness, abundance and zonation of the intertidal macroinfauna in relation to beach textural characteristics at five sandy beaches, covering a complete range of dissipativereflective categories.
Journal ArticleDOI
Diversity, dynamics and biogeography of Chilean benthic nearshore ecosystems: an overview and guidelines for conservation
Miriam Fernández,Eduardo Jaramillo,Pablo A. Marquet,Carlos A. Moreno,Sergio A. Navarrete,F. Patricio Ojeda,Claudio Valdovinos,Julio A. Vásquez +7 more
TL;DR: In this paper, the authors present a vision general del estado actual del conocimiento sobre la ecologia and the biogegrafia del sistema costero en Chile.
References
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Marine Benthic Diversity: A Comparative Study
TL;DR: A within-habitat analysis was made of the bivalve and polychaete components of soft-bottom marine faunas which differed in latitude, depth, temperature, and salinity, and it was indicated that species number is the more valid diversity measurement.
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The Influence of Interspecific Competition and Other Factors on the Distribution of the Barnacle Chthamalus Stellatus
TL;DR: Field observations on the daily routine and social behavior of common Indian monkeys, with special reference to the Bonnet monkey (Macaca radiata Geoff roy).
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Species Diversity Gradients: Synthesis of the Roles of Predation, Competition, and Temporal Heterogeneity
TL;DR: It is suggested that the "predation" and "competition" hypotheses of community organization and species diversity are complementary, and that Predator-mediated escapes by primary producers from herbivores may explain the apparent importance of interspecific competition in certain primary producer associations.
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Refuges, Disturbance, and Community Structure: A Marine Soft‐Bottom Example
TL;DR: It is demonstrated experimentally that a tube-like structure, such as a plastic straw, has the same effect on the infauna as does the tube of Diopatra, and the physical and biological refuges affect infaunal abundances similarly.