Macrobenthos of the coastal Budi Lagoon, southern Chile: Changes associated with seasonal environmental variation

Bertrán, Carlos; Fierro, Pablo; Encalada, Elizabeth; Peña‒Cortés, Fernando; Tapia, Jaime; Hauenstein, Enrique; Vargas‐Chacoff, Luis

doi:10.1590/s1679-87592016113306403

Cited by 7 publications

(2 citation statements)

References 30 publications

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“…Higher species diversity of macrobenthic fauna in low to medium organic carbon content in the coastal zones has been similarly reported by other studies (Bertrán et al, 2016;Mosbahi et al, 2016;Shou et al, 2017). Increased in organic carbon enhance productivity in deposit feeders however more organic carbon metabolism results in reduced dissolved oxygen in sediments leading in anoxic condition which in turn inhibit the survival of other macrobenthic fauna.…”

Section: Influence Of Sediment Type and Toc On Benthic Macrofaunasupporting

confidence: 79%

Assessment of Sediment and Benthic Macrofauna Distribution at Dar es Salaam Harbour Channel

Mwakisunga¹,

Machiwa²,

Pratap³

2020

GEP

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Sediment and macrobenthic fauna distribution at Dar es Salaam harbour channel were investigated to attest the influence of sediment grain size distribution and total organic carbon contents on benthic macrofauna dominance and diversity. Sampling campaign was conducted from January to April, 2019 in 25 sampling stations along the channel. Sediment grain sizes ranged between 0.7405 and 0.00273 mm with an average of 0.0804 mm classified as medium silt. Sediment distribution showed an onshore-offshore pattern consisting of fine dark clay-silt sediments in the southern part of the harbour close to Mwalimu Nyerere Bridge, medium (sandy) at the harbour and coarse sandy offshore. Five classes of macrofauna were identified with sedentary Polychaetes (Diopatra cuprea) found in tubes and free forms being dominant in most of the sediment types, however more abundant in clay-silt. High species diversity index values were encountered in sediments with medium total organic carbon (TOC) and sediment grain sizes (sand-silt). Apparently, low species similarity indices were observed in all sediment type indicating significant dissimilarities in species composition among sediment grain sizes. Thus, the distribution of benthic macrofauna species along Dar es Salaam harbour channel is strongly influenced by the sediment grain sizes and organic carbon contents in sediments.

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Section: Influence Of Sediment Type and Toc On Benthic Macrofaunasupporting

confidence: 79%

Assessment of Sediment and Benthic Macrofauna Distribution at Dar es Salaam Harbour Channel

Mwakisunga¹,

Machiwa²,

Pratap³

2020

GEP

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“…Nonetheless, many of them have been lost in the past, especially in the Mediterranean zone of Chile (25-39 • S), where ca. 73% of the national population live [5,21], and land uses (agriculture, livestock production and industries) have had and still have great impacts on water resources [22,23]. Nonetheless, biomonitoring studies of these systems are still lacking.…”

Section: Introductionmentioning

confidence: 99%

Macroinvertebrate-Based Biomonitoring of Coastal Wetlands in Mediterranean Chile: Testing Potential Metrics Able to Detect Anthropogenic Impacts

Coccia

Vega

Fierro

2022

Water

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Coastal wetlands are suffering from anthropogenic alterations worldwide. Aquatic monitoring based on macroinvertebrates has been successfully used to assess the ecological condition of many aquatic systems worldwide. Nonetheless, studies are still insufficient for the coastal wetlands of the South Pacific. Here, we present a preliminary attempt to select metrics based on aquatic macroinvertebrates to incorporate into coastal wetlands biomonitoring in the Chilean Mediterranean ecoregion. We sampled 25 sites in ten coastal wetlands during the austral spring of 2019. We used an integrated index that considers both human activities at catchment and at local scales to identify sites less or more disturbed. We tested a total of 70 metrics (either traditional or new metrics) representing different aspects of community structure/composition, functions and tolerance to pollution. Two metrics were finally retained: detritivore abundance (traditional metric) and geometric mean body size (new metric). These metrics were able to detect sites impacted by human activities. Thus, they might be considered as candidate metrics for the biomonitoring of these systems and to develop future indices. Moreover, because of their generality, they might also be applicable to coastal wetlands in other Mediterranean regions, including sites where taxonomic identification is still a challenge.

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Assessing differences in macrofaunal assemblages as a factor of sieve mesh size, distance between samples, and time of sampling

Hemery

Politano

Henkel

2017

Environ Monit Assess

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With increasing cascading effects of climate change on the marine environment, as well as pollution and anthropogenic utilization of the seafloor, there is increasing interest in tracking changes to benthic communities. Macrofaunal surveys are traditionally conducted as part of pre-incident environmental assessment studies and post-incident monitoring studies when there is a potential impact to the seafloor. These surveys usually characterize the structure and/or spatiotemporal distribution of macrofaunal assemblages collected with sediment cores; however, many different sampling protocols have been used. An assessment of the comparability of past and current survey methods was in need to facilitate future surveys and comparisons. This was the aim of the present study, conducted off the Oregon coast in waters 25-35 m deep. Our results show that the use of a sieve with a 1.0-mm mesh size gives results for community structure comparable to results obtained from a 0.5-mm mesh size, which allows reliable comparisons of recent and past spatiotemporal surveys of macroinfauna. In addition to our primary objective of comparing methods, we also found interacting effects of seasons and depths of collection. Seasonal differences (summer and fall) were seen in infaunal assemblages in the wave-induced sediment motion zone but not deeper. Thus, studies where wave-induced sediment motion can structure the benthic communities, especially during the winter months, should consider this effect when making temporal comparisons. In addition, some macrofauna taxa-like polychaetes and amphipods show high interannual variabilities, so spatiotemporal studies should make sure to cover several years before drawing any conclusions.

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Macrobenthos of the coastal Budi Lagoon, southern Chile: Changes associated with seasonal environmental variation

Cited by 7 publications

References 30 publications

Assessment of Sediment and Benthic Macrofauna Distribution at Dar es Salaam Harbour Channel

Assessment of Sediment and Benthic Macrofauna Distribution at Dar es Salaam Harbour Channel

Macroinvertebrate-Based Biomonitoring of Coastal Wetlands in Mediterranean Chile: Testing Potential Metrics Able to Detect Anthropogenic Impacts

Assessing differences in macrofaunal assemblages as a factor of sieve mesh size, distance between samples, and time of sampling

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