scholarly journals Cascading Effects of Shrimp Trawling: Increased Benthic Biomass and Increase in Net Primary Production

2018 ◽  
Author(s):  
Luczkovich Joseph John ◽  
Deehr Rebecca A ◽  
Kevin J Hart ◽  
Lisa M Clough ◽  
Jeffrey C Johnson
Keyword(s):  
Net Primary Production ◽  
Network Models ◽  
Ecological Disturbance ◽  
Cascading Effects ◽  
Trawl Fishery ◽  
Southern Flounder ◽  
Management Actions ◽  
Benthic Biomass ◽  
Shrimp Trawl ◽  
Deposit Feeding

AbstractTrawling has been shown to cause high mortality of discarded species (bycatch) and short-term ecological disturbance to bottom communities in coastal systems, resulting in lowered benthic biomass. Here we report evidence of a trawling-induced trophic cascade resulting in an increase in biomass of benthic polychaetes after the end of the shrimp trawling season in areas open to trawling in North Carolina (USA). Using comparative measurements of abundance of bycatch species and benthos in open and closed trawling management areas and Ecopath network modeling, we show that trawling in the open area has led to increases in deposit-feeding polychaetes and decreases in bycatch species (fish and crabs) that are benthic predators on the polychaetes. We conclude that proposed management actions to reduce the shrimp trawl fishery effort will influence other net and trap fisheries for southern flounder and blue crabs indirectly, as revealed by our network models, and the proposed trawling ban may lead to improvements in other valuable fisheries.

Composition and diversity patterns of megafauna discards in the deep-water shrimp trawl fishery off Brazila

2013 ◽  
Vol 83 (4) ◽  
pp. 804-825 ◽  
Author(s):  
J. A. A. Perez ◽  
B. N. Pereira ◽  
D. A. Pereira ◽  
R. Schroeder
Keyword(s):  
Deep Water ◽  
Diversity Patterns ◽  
Trawl Fishery ◽  
Shrimp Trawl

scholarly journals Does the closed fishing season influence the ichthyofauna consumed by Larus dominicanus?

2017 ◽  
Vol 65 (1) ◽  
pp. 9-18 ◽  
Author(s):  
Maiara Larissa Miotto ◽  
Barbara Maichak de Carvalho ◽  
Henry Louis Spach
Keyword(s):  
Bird Species ◽  
Strong Relationship ◽  
Morphometric Measurements ◽  
Fishing Activity ◽  
Trawl Fishery ◽  
Shrimp Trawl ◽  
Larus Dominicanus ◽  
The Family ◽  
The Mean ◽  
Closed Season

Abstract Fish that are incidentally caught by shrimp trawling represent a predictable and abundant resource for feeding several bird species, especially for the gull Larus dominicanus. This fishing activity is subject to disruptions throughout the year during closed fishing seasons, when other fishing modalities are exercised, which can alter the composition, abundance and size of the fish bycatch. This study evaluated the influence of the restriction of fishing period of shrimp (closed season) on the diet of L. dominicanus, on the Paraná State coast. From December 2013 to August 2014, 10 pellets were collected per month in two distinct areas that have shrimp trawl fishery as the main economic activity: one continental and another in an estuarine island. In total, 920 fish were identified, divided into four families and 15 species, especially the family Sciaenidae with 11 species. There were differences in abundance and biomass of species between areas and between seasons of pre-closure, closure and post-closure. Differences for the mean total length of the species were only detected between the pre-closed and closed seasons in one area. This study evidenced the strong relationship between L. dominicanus and the shrimp trawl fishery, the species composition identified in the pellets and their respective morphometric measurements follow the same pattern of the literature for fish discarded in trawling activities.

scholarly journals New records of Hippocampus patagonicus Piacentino & Luzzatto, 2004 (Teleostei: Syngnathidae) from the coast of Paraná, southern Brazil

Check List ◽  
2016 ◽  
Vol 12 (1) ◽  
pp. 1822
Author(s):  
Luci F. Pereira ◽  
Rosana B. Silveira ◽  
Vinícius Abilhoa
Keyword(s):  
New Records ◽  
Conservation Strategies ◽  
Brazilian Coast ◽  
Southwestern Atlantic ◽  
Southern Brazil ◽  
Incidental Capture ◽  
Additional Information ◽  
Trawl Fishery ◽  
Shrimp Trawl ◽  
Management And Conservation

Abstract: The seahorse Hippocampus patagonicus (Teleostei: Syngnathidae) is the southernmost occurring species of its genus in the South Atlantic Ocean. Its distribution seems to be restricted to the Southwestern Atlantic, along the coasts of Argentina and Brazil. Herein we report the incidental capture of six individuals as bycatch in the shrimp trawl fishery off the coast of Paraná, southern Brazil. Additional information on the geographic distribution of H. patagonicus, together with its ecology and life history, is important for conservation of this threatened species. These data can promote the development of appropriate management and conservation strategies for populations along the Brazilian coast. 

Assessing the vulnerability of demersal elasmobranchs to a data-poor shrimp trawl fishery in Costa Rica, Eastern Tropical Pacific

2018 ◽  
Vol 217 ◽  
pp. 321-328 ◽  
Author(s):  
Tayler M. Clarke ◽  
Mario Espinoza ◽  
Raquel Romero Chaves ◽  
Ingo S. Wehrtmann
Keyword(s):  
Costa Rica ◽  
Tropical Pacific ◽  
Eastern Tropical Pacific ◽  
Trawl Fishery ◽  
Shrimp Trawl

scholarly journals Sistema para el Seguimiento del funcionamiento de ecosistemas en la Red de Parques Nacionales de España mediante Teledetección

2016 ◽  
pp. 119 ◽  
Author(s):  
J. Cabello ◽  
D. Alcaraz-Segura ◽  
A. Reyes ◽  
P. Lourenço ◽  
J. M. Requena ◽  
...  
Keyword(s):  
National Parks ◽  
Land Surface ◽  
Ecosystem Functioning ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Net Primary Production ◽  
Conservation Status ◽  
Vegetation Indices ◽  
Reference Conditions ◽  
Management Actions

<p>Management of protected areas in the current context of global change requires approaches to characterize and to monitor ecosystem functioning. Remote sensing provides adequate tools for that because it provides índices that inform repeatedly and for large areas of land, about matter and energy exchanges between the biota and land surface. Considering this principle, and the continuous improvements in the availability of satellite data of higher quality and friendly use, we have developed with the Autonomous Organization of National Parks of Spain (OAPN), a monitoring system that complements other monitoring initiatives from this agency to inform about the conservation status of national parks. The system, called REMOTE, is based on the most used spectral vegetation indices on scientific literature, EVI (Enhanced Vegetation Index) and NDVI (Normalized Difference Vegetation Index), derived from the time series of satellite images of the MODIS-Terra sensor. The systems allows to progress in identification of reference conditions to understand and predict ecosystems response against environmental perturbations or management actions, and their directional changes (trends) they are experiencing. Likewise, establishment of reference conditions helps to identify anomalies that warn of sudden changes in ecosystem functioning. The system uses as ecosystem functioning indicators three attributes related to the annual carbon gains (net primary production) by the canopy, their seasonality and phenology. In addittion, Remote has been designed and programmed on open and free software allowing future modifications and improvements in an easy way. The implementation of this system aims to inform decision-makers and managers of the Network of National Parks of Spain about the health and conservation status of ecosystems.</p>

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