Bycatch of the squat lobster Munida gregaria in bottom trawl fisheries in San Jorge Gulf, Argentina

Varisco, Martín; Vinuesa, Julio H.; Góngora, María Eva

doi:10.4067/s0718-19572015000300004

Cited by 7 publications

(5 citation statements)

References 11 publications

(20 reference statements)

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“…Varisco et al. () hypothesized that the lower abundance of Me. hubbsi could explain the demographic expansion of Mu.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, Mu. gregaria is actually the most important crustacean in the by-catch of the Patagonian shrimp fishery (Varisco, Vinuesa, & Góngora, 2015). Its commercial potential was recognized, and it was even included in cookbooks from Argentina (Bigongiari, 2016).…”

Section: Munida Gregaria Usually Exhibits High Abundances In Southernmentioning

confidence: 99%

“…Munida gregaria can remain pelagic after metamorphosis for up to 6 months; adults are benthic but can perform vertical migrations into the water layer (Diez et al, 2012;Zeldis, 1985), which would fa- populations were strongly inversely related to predator abundance (Worm & Myers, 2003). Varisco et al (2015) (Sánchez & Prenski, 1996). whereas top-down control should result in a negative correlation between predators and prey (Richardson & Schoeman, 2004 Sánchez, & Mianzan, 2012).…”

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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“…Varisco et al. () hypothesized that the lower abundance of Me. hubbsi could explain the demographic expansion of Mu.…”

Section: Discussionmentioning

confidence: 99%

Section: Munida Gregaria Usually Exhibits High Abundances In Southernmentioning

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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“…There are large spawning and hatchery areas for Argentine hake and Patagonian grenadier in the SJG. Bycatch that is discarded dead from the fishing vessels may be among the major causes of increased nutrient concentrations at depth; among the most abundant species discarded are invertebrates, bony fishes, cartilaginous fishes (Bovcon et al, 2013), lobster (Varisco et al, 2015), and Argentine hake (Góngora, 2011). Between 1998 and 2004, the biomass discarded south of 41°S ranged from 6,000 tons to 22,000 tons in the hake fishery, and from 17,000 tons to 46,000 tons in the grenadier fishery; the maximum value (105,000 tons) was recorded in 1997 (Cordo, 2006;Góngora, 2011).…”

Section: Fishing Activity As Nutrient Source In the San Jorge Gulfmentioning

confidence: 99%

Dynamics of Macronutrients in the San Jorge Gulf During Spring and Summer

Torres¹,

Paparazzo²,

Williams³

et al. 2018

Oceanog

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“…It is important to mention that Brickle et al (2002) also found M. gregaria in the stomachs of D. gahi, but its prominence within the last decade seems to have increased (Rosas-Luis et al, 2016). Munida gregaria became one of the most important bycatch species in Patagonian fisheries in Argentine waters (Varisco et al, 2015) and in the last decade an increased abundance of M. gregaria was observed on the Patagonian shelf (Diez et al, 2016). A study by Diez et al (2016) indicated a population expansion of M. gregaria over the whole Patagonian shelf due to the shelf's increased productivity.…”

Section: Discussionmentioning

confidence: 99%

Size-related, seasonal and interdecadal changes in the diet of the Patagonian longfin squid Doryteuthis gahi in the South-western Atlantic

et al. 2021

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The Patagonian longfin squid Doryteuthis gahi has an annual life cycle with two seasonal cohorts (autumn and spring spawners). Earlier studies on the Patagonian shelf found a predominance of Euphausiacea in the D. gahi diet, but no studies to date have investigated differences between feeding spectra of the two cohorts or decadal diet shifts. The present study investigated differences in diet of D. gahi on the Patagonian shelf sampled two decades apart, and differences between seasonal cohorts. Classical stomach content analysis and generalized additive models were used to investigate and model the influence of mantle length, sampling period and spawning cohort on the diet. Results revealed an ontogenetic diet change from ~70% Frequency of Occurrence of Euphausiacea in small squid to more than 60% FO of fish and Cephalopoda at larger sizes. Cannibalism was also frequently observed. Euphausiacea were ingested more frequently and in higher amounts during the austral summer and therefore were consumed more by the autumn spawning cohort, whereas fish was more frequently fed upon during austral winter and also by the spring spawning cohort. Cannibalism was also recorded more in austral winter months but, contrary to feeding on fish, was more prevalent in the autumn spawning cohort. Increased predation of Munida gregaria was observed in 2020 compared with 2001. This study is an important step towards improving the knowledge of D. gahi's two seasonal cohorts, providing data that can be used for future ecosystem modelling.

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Bycatch of the squat lobster Munida gregaria in bottom trawl fisheries in San Jorge Gulf, Argentina

Cited by 7 publications

References 11 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

Dynamics of Macronutrients in the San Jorge Gulf During Spring and Summer

Size-related, seasonal and interdecadal changes in the diet of the Patagonian longfin squid Doryteuthis gahi in the South-western Atlantic

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