Coastal geomorphology and oceanographic features shape subtidal benthic communities in management areas of central Chile

2020 ◽  
Author(s):  
Aldo Hernández ◽  
Fabián J. Tapia ◽  
Gonzalo S. Saldías ◽  
Renato A. Quiñones
Keyword(s):  
Benthic Communities ◽  
Coastal Geomorphology ◽  
Central Chile

scholarly journals Benthic communities under anthropogenic pressure show resilience across the Quaternary

2017 ◽  
Vol 4 (9) ◽  
pp. 170796 ◽  
Author(s):  
Julieta C. Martinelli ◽  
Luis P. Soto ◽  
Jorge González ◽  
Marcelo M. Rivadeneira
Keyword(s):  
Management Practices ◽  
Benthic Communities ◽  
Anthropogenic Factors ◽  
Anthropogenic Pressure ◽  
North Central ◽  
Central Chile ◽  
Species Abundances ◽  
Mollusc Species ◽  
Evenness Indices ◽  
Benthic Resources

The Southeast Pacific is characterized by rich upwelling systems that have sustained and been impacted by human groups for at least 12 ka. Recent fishing and aquaculture practices have put a strain on productive coastal ecosystems from Tongoy Bay, in north-central Chile. We use a temporal baseline to determine whether potential changes to community structure and composition over time are due to anthropogenic factors, natural climatic variations or both. We compiled a database ( n  = 33 194) with mollusc species abundances from the Mid-Pleistocene, Late Pleistocene, Holocene, dead shell assemblages and live-sampled communities. Species richness was not significantly different, neither were diversity and evenness indices nor rank abundance distributions. There is, however, an increase in relative abundance for the cultured scallop Argopecten , while the previously dominant clam Mulinia is locally very rare. Results suggest that impacts from both natural and anthropogenic stressors need to be better understood if benthic resources are to be preserved. These findings provide the first Pleistocene temporal baseline for the south Pacific that shows that this highly productive system has had the ability to recover from past alterations, suggesting that if monitoring and management practices continue to be implemented, moderately exploited communities from today have hopes for recovery.

Primary production and phytoplanktonic biomass in shallow marine environments of central Chile: Effect of coastal geomorphology

2007 ◽  
Vol 73 (1-2) ◽  
pp. 137-147 ◽  
Author(s):  
Luis A. Henríquez ◽  
Giovanni Daneri ◽  
Carlos A. Muñoz ◽  
Paulina Montero ◽  
Rodrigo Veas ◽  
...  
Keyword(s):  
Primary Production ◽  
Coastal Geomorphology ◽  
Marine Environments ◽  
Central Chile ◽  
Shallow Marine

Potential effects of bycatch from the squat lobster fisheries in central Chile on the benthic ecosystem: a survey data approach

2020 ◽  
Vol 71 (10) ◽  
pp. 1281
Author(s):  
José T. Montero ◽  
Andres Flores ◽  
Dante Queirolo ◽  
Ariel Farias ◽  
Rodrigo Wiff ◽  
...  
Keyword(s):  
Benthic Communities ◽  
Potential Interaction ◽  
Survey Method ◽  
Benthic Species ◽  
Central Chile ◽  
Squat Lobster ◽  
The Past ◽  
Suitability Maps ◽  
Resource Status ◽  
Trawl Fisheries

In Chile, bottom trawling for squat lobsters is one of the most important crustacean fisheries. The fishery has been monitored for the past 15 years to assess the resource status, spatial distribution and effects on benthic species. Understanding the interactions of fishing and non-fishing activities with the benthic communities is of critical importance to estimate the potential bycatch of important economic species from fishing operations and to determine adequate spatial and temporal fishing bans. In this study we characterised the community of the main non-target species caught during historical squat lobster biomass surveys from 2000 to 2015 and interpreted the species included as potential bycatch of the fishery. Four ecological assemblages were found that differed in abundance but not in species richness, which suggests that the community structures did not differ among the areas, but rather in the relative abundances of the species. In addition, we created habitat suitability maps for the groups identified and discuss the effects of the environment and the survey method on the distribution of the groups. Managers can use this information to detect regions with high bycatch risk for demersal trawl fisheries and understand the potential interaction of fishing operations with the environment.

scholarly journals Composition and vertical distribution of metazoan meiofauna assemblages on the continental shelf off central Chile

2017 ◽  
Vol 43 (5) ◽  
pp. 922-935
Author(s):  
Eulogio Soto ◽  
Williams Caballero ◽  
Eduardo Quiroga
Keyword(s):  
Vertical Distribution ◽  
Southern Oscillation ◽  
Benthic Communities ◽  
Stable Carbon Isotope ◽  
Organic Content ◽  
Dominant Group ◽  
Central Chile ◽  
Chloroplast Pigments ◽  
Metazoan Meiofauna ◽  
Seasonal Hypoxia

A quantitative study of metazoan meiofauna was carried out in Valparaiso Bay (33°S 71°W) which is affected by seasonal hypoxia in central Chile. The contents of bottom water, dissolved oxygen (BWDO), organic carbon, chloroplast pigments and composition of stable carbon isotope (d13C)  in the sediment were used as a measure of the contribution of primary production in the water column, which accumulates in the sediment. Meiofauna abundances in the three sampling stations (80-140 m depth) ranged from 2.218 ± 643 to 1.592 ± 148 ind 10 cm-2. Nine upper metazoan meiofauna groups were recorded, with nematodes as the dominant group, contributing with more than 95% of total abundances. The abundance vertical distribution was concentrated in the first layers of sediment in most groups except Acari and nauplii larvae. Canonical correspondence analysis revealed significant correlations (P < 0.05) between the meiofauna abundance and organic content, depth and redox potential from sediments. These results represent a first approach to understanding the ecology of meiofaunal assemblages in the Valparaiso Bay and may be useful as a baseline for future comparisons and descriptions of the ENSO (El Niño Southern Oscillation) and seasonal variations of these unknown benthic communities.

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