Intertidal seaweeds from North Atlantic Patagonian coasts, Argentina

The coasts located between 39°S and 41°S in the Argentinean biogeographic province have been described by impoverished seaweed assemblages, however the floristic information about this region is sparse. The aim of this study was to survey the intertidal seaweeds inhabiting three sites in the oceanographic system “El Rincon” (Buenos Aires, Argentina). A total of 42 taxa were identified with a dominance of Rhodophyta species. The sandstone outcrops (SO) had 29 taxa, whereas both the tidal flat (TF) and oyster reefs (OR) had 11 taxa. The estuarial species Ulva intestinalis and Ulva prolifera were recorded in TF, whereas calcified macroalgae were only found in SO. The differences in richness and composition of seaweed assemblages were associated with substrate type, wave exposure, incident light and salinity. These differences were also evidenced by a dissimilar number of functional groups, which was higher in SO with a dominance of filamentous macroalgae.

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Reviews

Contributions to the History of Concepts ◽

10.3167/choc.2020.150207 ◽

2020 ◽

Vol 15 (2) ◽

pp. 130-139

Author(s):

Risto-Matti Matero ◽

Juan Alejandro Pautasso

Keyword(s):

North Atlantic ◽

Buenos Aires ◽

The North ◽

The World ◽

History Of ◽

The North Atlantic

Paul Warde, Libby Robin, and Sverker Sörlin, The Environment: A History of the Idea (Baltimore, MD: John Hopkins University Press, 2018), 244 pp. Fabio Wasserman, ed., El mundo en movimiento: El concepto de revolución en Iberoamérica y el Atlántico norte (siglos XVII–XX) [The world in motion: The concept of revolution in Iberian America and the North Atlantic (seventeenth–twentieth centuries)] (Buenos Aires: Miño y Dávila editores, 2019), 293 pp.

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Effects of Substrate on Movement Patterns and Behavior of Stream Fish through Culverts: An Experimental Approach

Sustainability ◽

10.3390/su11020470 ◽

2019 ◽

Vol 11 (2) ◽

pp. 470 ◽

Cited By ~ 4

Author(s):

Kyla Johnson ◽

Lindsay Wait ◽

Suzanne Monk ◽

Russell Rader ◽

Rollin Hotchkiss ◽

...

Keyword(s):

Freshwater Fish ◽

Functional Groups ◽

Fish Species ◽

Swimming Behavior ◽

Small Fish ◽

Natural Substrate ◽

Substrate Type ◽

Low Velocity ◽

Large Flow ◽

Leatherside Chub

Culverts can provide a significant barrier to fish passage by fragmenting fish habitats and impeding the passage success of small-bodied fish. Geographical connectivity is critical to the maintenance of diverse fish assemblages. Culverts with high cross-sectional velocity can cause population fragmentation by impeding passage of small, freshwater fish. Behavioral responses of small fish to high velocities can differ among functional groups, and swimming behavior of many species is not well known. We tested effects of substrate type on swimming behavior in two small, freshwater fish species—southern leatherside chub (Lepidomeda aliciae, a midwater species), and longnose dace (Rhinichthys cataractae, a benthic species)—across three substrate treatments: (1) a bare flume, (2) large flow obstacles, and (3) a natural cobble substrate. Both longnose dace and southern leatherside chub used paths of low velocity and swam in the near-substrate boundary area. Fish in the bare flume and large obstacle treatments swam along the corners of the flume in a straight swim path, whereas fish in the natural substrate treatment used all parts of the flume bed. There was no relationship between passage success of fish and substrate type, fish species, or their interaction. In contrast, substrate type, fish species, and their interaction were significant predictors of passage time. Southern leatherside chub passed through the test section about two to four times faster than longnose dace. Both species took longer to pass through the large flow obstacle treatment compared to the bare flume or natural substrate. The natural substrate created a complex velocity profile with areas of low velocity throughout the entire flume, in contrast to the other two treatments. Our data suggest natural substrates can improve the passage of small fish in high-velocity culverts for both benthic and midwater functional groups.

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Trophic functional groups and trophic levels of the macrobenthic community at the eastern tidal flat of Lingkun Island, China

Acta Ecologica Sinica ◽

10.1016/s1872-2032(09)60005-6 ◽

2008 ◽

Vol 28 (10) ◽

pp. 4796-4804 ◽

Cited By ~ 4

Author(s):

Ge Baoming ◽

Bao Yixin ◽

Cheng Hongyi ◽

Li Huanhuan ◽

Hu Zhiyuan

Keyword(s):

Functional Groups ◽

Tidal Flat ◽

Trophic Levels ◽

Macrobenthic Community

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Understanding the conditionality of ecosystem services: The effect of tidal flat morphology and oyster reef characteristics on sediment stabilization by oyster reefs

Ecological Engineering ◽

10.1016/j.ecoleng.2017.12.020 ◽

2018 ◽

Vol 112 ◽

pp. 89-95 ◽

Cited By ~ 11

Author(s):

João N. Salvador de Paiva ◽

Brenda Walles ◽

Tom Ysebaert ◽

Tjeerd J. Bouma

Keyword(s):

Ecosystem Services ◽

Tidal Flat ◽

Oyster Reef ◽

Oyster Reefs ◽

Sediment Stabilization

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Influence of piers on functional groups of benthic primary producers and consumers in the channel of a subtropical coastal lagoon

Brazilian Journal of Oceanography ◽

10.1590/s1679-87592012000100007 ◽

2012 ◽

Vol 60 (1) ◽

pp. 65-73 ◽

Cited By ~ 5

Author(s):

Paulo Roberto Pagliosa ◽

Mauricio Cantor ◽

Fernando Scherner ◽

Mariana Beatriz Paz Otegui ◽

Aurea Luiza Lemes-Silva ◽

...

Keyword(s):

Functional Groups ◽

Photosynthetic Activity ◽

Biomass Productivity ◽

Life Forms ◽

Artificial Habitats ◽

Negative Effect ◽

Primary Producer ◽

Filamentous Macroalgae ◽

Benthic Ecosystems ◽

New Habitats

Artificial habitats have become common in coastal areas worldwide and may influence the structure and functioning of benthic ecosystems. We analyze the influence of piers on the benthic morphofunctional groups of rocky seaweeds and of soft bottom macrofauna in the channel of Conceição Lagoon (southern Brazil). The main impact is a reduction in the luminosity available for photosynthetic activity which is directly related to a decrease in the biomasses of sediment microphytobenthos and of more highly structured macroalgae life-forms. Contrary to expectations, the morphotypes of potentially high biomass productivity, such as articulated coralline, corticated and leathery macroalgae, were in general less abundant and the low biomass foliose and filamentous macroalgae occurred in reference areas but not under the piers. The piers' effects on motile epifauna and infauna functional groups were site-specific and probably related to the general reduction in primary producer organisms in the new habitats. The discretely motile infauna was the only functional group able to thrive under the piers due to their reduced motility and fragile morphological structures, being benefited by the shelter provided by the artificial habitats. Our results showed that the piers might have a negative effect on the base-trophic level organisms responsible for bottom-up controls.

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Open discussion

Symposium - International Astronomical Union ◽

10.1017/s0074180900029533 ◽

1982 ◽

Vol 99 ◽

pp. 605-613

Author(s):

P. S. Conti

Keyword(s):

Buenos Aires ◽

Large Mass ◽

List Type ◽

Common Phenomenon ◽

Open Discussion ◽

The Stability ◽

Ring Nebulae

Conti: One of the main conclusions of the Wolf-Rayet symposium in Buenos Aires was that Wolf-Rayet stars are evolutionary products of massive objects. Some questions:–Do hot helium-rich stars, that are not Wolf-Rayet stars, exist?–What about the stability of helium rich stars of large mass? We know a helium rich star of ∼40 MO. Has the stability something to do with the wind?–Ring nebulae and bubbles : this seems to be a much more common phenomenon than we thought of some years age.–What is the origin of the subtypes? This is important to find a possible matching of scenarios to subtypes.

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