Hydroacoustical evidence of the expansion of pelagic swarms of Munida gregaria (Decapoda, Munididae) in the Beagle Channel and the Argentine Patagonian Shelf, and its relationship with habitat features

Diez, Mariano J.; Cabreira, Ariel G.; Madirolas, Adrián; Lovrich, Gustavo A.

doi:10.1016/j.seares.2016.04.004

Cited by 36 publications

(29 citation statements)

References 41 publications

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“…During the past decade scientists have started to examine the ecological role of these abundant organisms in an effort to take a more integrated ecosystem approach to fisheries management (Lovrich & Thiel, ). Diez, Cabreira, Madirolas, and Lovrich () have more recently noted that between 2009 and 2014 pelagic swarms of Mu. gregaria increased their occurrence and abundance in both the Beagle Channel and on the Argentine Patagonian Shelf.…”

Section: Discussionmentioning

confidence: 99%

“…In accordance with our results, an increase in Mu. gregaria swarms and benthic aggregations occurred in southern areas of the SJG (Diez, Cabreira et al., ; Roux & Piñero, ), probably driven by natural population growth in the absence of high predation‐related mortality, coupled with oceanographic factors. Both aspects are discussed below.…”

Section: Discussionmentioning

confidence: 99%

Section: Munida Gregaria Usually Exhibits High Abundances In Southernmentioning

confidence: 99%

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Adaptation of diet in a changed environment: Increased consumption of lobster krill Munida gregaria (Fabricius, 1793) by Argentine hake

2017

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A well‐replicated decadal‐term (2005–2014) stomach content data set was analysed in order to infer inter‐annual fluctuations in the diet of the Argentine hake, Merluccius hubbsi, an opportunistic predator in the San Jorge Gulf (SJG) ecosystem in the Southwest Atlantic. Ten research cruises were carried out each year during January from 2005 to 2014. A total of 18,461 specimens of Me. hubbsi was analysed, of which 6,777 (36.71%) contained food in their stomachs. The diet of Me. hubbsi changed markedly from 2011 onwards, with much greater consumption of the lobster krill Munida gregaria compared to the years before 2011. The frequency of occurrence (%F) of Mu. gregaria in the stomach contents of Argentine hake increased from the year 2009 onwards, most noticeably since 2011, and mostly over the southern region of the SJG. The main predators of Mu. gregaria in the SJG are two species of teleost fish (pink cusk eel, Genypterus blacodes, Argentine seabass, Acanthistius brasilianus) and three Rajidae skates (Zearaja chilensis, Psammobatis spp. and Sympterygia bonapartii), which exhibited decreased catches in the years analysed. The increased consumption of Mu. gregaria by Me. hubbsi, coupled with decreased trends in abundance of the main predators of the lobster krill during the last decade, indicate that top‐down trophic dynamic control occurs in the SJG ecosystem.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Munida Gregaria Usually Exhibits High Abundances In Southernmentioning

confidence: 99%

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Adaptation of diet in a changed environment: Increased consumption of lobster krill Munida gregaria (Fabricius, 1793) by Argentine hake

2017

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“…These species fulfill several criteria to be considered WW species, including: (1) they are species with high regional abundances (Madirolas et al 2000, Padovani et al 2012, Arkhipkin & Laptikhovsky 2013, (2) they seem to occupy low to mid-trophic positions (TPs) in food webs (Ciancio et al 2008, Riccialdelli et al 2010), (3) many predators feed on them (Raya Rey et al 2007, Riccialdelli et al 2010, Scioscia et al 2014, and (4) the population dynamics of these species appear to depend on the environment (e.g. climatic variations) (Diez et al 2016(Diez et al , 2018. There is a need for better identification of WW species as an essential functional trophic group to improve food-web models, but particularly for conservation purposes.…”

Section: Introductionmentioning

confidence: 99%

Trophic structure of southern marine ecosystems: a comparative isotopic analysis from the Beagle Channel to the oceanic Burdwood Bank area under a wasp-waist assumption

Riccialdelli

Becker

Fioramonti

et al. 2020

Mar. Ecol. Prog. Ser.

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Understanding the structure and functioning of marine ecosystems has become a critical issue to assess the potential short- and long-term effects of natural and anthropogenic impacts and to determine the knowledge needed to conduct appropriate conservation actions. This goal can be achieved in part by acquiring more detailed food web information and evaluating the processes that shape food web structure and dynamics. Our main objective was to identify large-scale patterns in the organization of pelagic food webs that can be linked to a wasp-waist (WW) structure, proposed for the southwestern South Atlantic Ocean. We evaluated 3 sub-Antarctic marine areas in a regional context: the Beagle Channel (BC), the Atlantic coast of Tierra del Fuego (CA) and the oceanic Burdwood Bank area (BB). We used carbon and nitrogen isotopic information of all functional trophic groups, ranging from primary producers to top predators, and analyzed them through stable isotope-based Bayesian analyses. We found that BC and BB have a more pronounced WW structure compared to CA. We identified species at mid to low trophic positions that play a key role in the trophodynamics of each marine area (e.g. Fuegian sprat Sprattus fuegensis, longtail southern cod Patagonotothen ramsayi and squat lobster Munida gregaria) and considered them as the most plausible WW species. The identification of the most influential species within food webs has become a crucial task for conservation purposes in local and regional contexts to maintain ecosystem integrity and the supply of ecosystem services for the southwestern South Atlantic Ocean.

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“…This is similar to the definition of TS where TS value is the result of the detection of a single organism, while SV is the value for detection organism groups in (Kaartvedt and Aksnes, 2012) To date research on fish stock estimates done by cruise track using a SIMRAD EK 60 Scientific split beam echo sounder system with a frequency of 70 kHz and acoustic data acquisition is performed continuously during the day and night during the period boat cruise at speeds ranging between 7-8 knots. Trails include a data acquisition area of an area that allows the analysis of spatially made with the zig-zag shape according to (MacLennan and Simmonds, 1992in (Diez et al, 2016, Jurvelius et al, 2016 with the length of each transect approximately 12 nmi of bounds islands outwards. Density values for fish processing performed on Ms. Excel.…”

Section: Introductionmentioning

confidence: 99%

Acoustic systems (split beam echo sounder ) to determine abundance of fish in marine fisheries

Lubis

Manik

2017

J. Geoscience Eng. Environ. Technol.

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Acoustic waves are transmitted into the subsurface ocean will experience scattering (scattering) caused by marine organisms, material distributed in the ocean, the structure is not homogeneous in seawater, as well as reflections from the surface and the seabed. Estimation of fish stocks in the waters wide as in Indonesia have a lot of them are using the acoustic method. The acoustic method has high speed in predicting the size of fish stocks so as to allow acquiring data in real time, accurate and high speed so as to contribute fairly high for the provision of data and information of fishery resources. Split beam echo sounder comprises two aspects, and a transducer. The first aspect is the high-resolution color display for displaying echogram at some observations and also serves as a controller in the operation of the echo sounder. The second aspect is transceiver consisting of transmitter and receiver. The Echosounder divided beam first inserted into the ES 3800 by SIMRAD beginning of the 1980s and in 1985 was introduced to fishermen in Japan as a tool for catching up. Split beam transducer is divided into four quadrants. Factors that contribute affect the value of Target Strength (TS) fish Strength target can generally be influenced by three factors: a target factor itself, environmental factors, and factors acoustic instrument. Factors include the size of the target, the anatomy of fish, swim bladder, the behavior of orientation.

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Hydroacoustical evidence of the expansion of pelagic swarms of Munida gregaria (Decapoda, Munididae) in the Beagle Channel and the Argentine Patagonian Shelf, and its relationship with habitat features

Cited by 36 publications

References 41 publications

Adaptation of diet in a changed environment: Increased consumption of lobster krill Munida gregaria (Fabricius, 1793) by Argentine hake

Adaptation of diet in a changed environment: Increased consumption of lobster krill Munida gregaria (Fabricius, 1793) by Argentine hake

Trophic structure of southern marine ecosystems: a comparative isotopic analysis from the Beagle Channel to the oceanic Burdwood Bank area under a wasp-waist assumption

Acoustic systems (split beam echo sounder ) to determine abundance of fish in marine fisheries

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