Abundance, distribution and population dynamics of the short fin squid Illex argentinus in Southeastern and Southern Brazil

Haimovici, Manuel; Santos, Roberta Aguiar dos; Bainy, Mara Cristiane Rodrigues Silveira; Fischer, Luciano Gomes; Cardoso, L. P.

doi:10.1016/j.fishres.2013.09.007

Cited by 13 publications

(15 citation statements)

References 30 publications

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“…This species feed upon large squids [ 55 ] that are probably more associated to a demersal food web with different temporal pattern of productivity. Therefore the distribution pattern found in this study is possibly related to abundance of the short fin squids, one of the species’ main prey in this area [ 56 , 57 ]. The short fin squid is associated with cold waters presenting high abundance during autumn mainly over the continental slope and a more sparse distribution with low abundances in late spring [ 57 ].…”

Section: Discussionmentioning

confidence: 99%

“…Therefore the distribution pattern found in this study is possibly related to abundance of the short fin squids, one of the species’ main prey in this area [ 56 , 57 ]. The short fin squid is associated with cold waters presenting high abundance during autumn mainly over the continental slope and a more sparse distribution with low abundances in late spring [ 57 ]. Probably this higher abundance of the short fin squid in autumn is a result of the enhanced productivity during spring as the development of all trophic levels between phytoplankton and large squids takes approximately four months [ 58 ].…”

Section: Discussionmentioning

confidence: 99%

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Diversity and Distribution Patterns of Cetaceans in the Subtropical Southwestern Atlantic Outer Continental Shelf and Slope

et al. 2016

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Temporal and spatial patterns of cetacean diversity and distribution were investigated through eight ship-based surveys carried out during spring and autumn between 2009 and 2014 on the outer continental shelf (~150m) and slope (1500m) off southeastern and southern Brazil (~23°S to ~34°S). The survey area was divided into southeast and south areas according to their oceanographic characteristics. Twenty-one species were observed in 503 sightings. The overall number of species was similar between the two areas, though it was higher in the spring in the south area. Five species were dominant and diversity varied more seasonally than spatially. ANOVA and kernel analyses showed that overall cetacean densities were higher in spring compared to autumn. Physeter macrocephalus, the most frequent species, concentrated throughout the south area at depths over 1000m in both seasons. Despite the overlapped occurrence at a broader scale, small delphinids presented latitudinal and in-offshore gradients as well as seasonal variation in distribution patterns, which could indicate habitat partitioning between some species. Delphinus delphis was only recorded in the south and its density decreased in areas where the presence of Stenella frontalis increased, mainly beyond the 250m isobath. Densities of S. longirostris and S. attenuata increased in lower latitudes and beyond the shelf break. The large delphinids Tursiops truncatus and Globicephala melas formed mixed groups in many occasions and were observed along the study area around depths of 500m. Grampus griseus was twice as frequent in the south area and densities increased in waters deeper than 600m. As expected, densities of both small and large migratory whales were higher during spring, over the continental slope, in the southeast area. The results presented here provided strong evidence on the importance of the outer continental shelf and slope to a diverse community of cetaceans occurring in the subtropical Southwestern Atlantic.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Diversity and Distribution Patterns of Cetaceans in the Subtropical Southwestern Atlantic Outer Continental Shelf and Slope

et al. 2016

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“…Along the southern Brazilian slope, between 27° and 34°S, prereproductive and reproductive concentrations (mature, fertilized and spawned adults) have been found from early winter to mid‐spring (July–October) (Haimovici and Alvarez‐Pérez, 1990; Perez et al, 2009; Haimovici et al., 2013). These squids spawn on the slope and in the BC to the north of the STF.…”

Section: Discussionmentioning

confidence: 99%

“…Haimovici et al. (1998, 2013) proposed that the spawning individuals caught in southern Brazil during winter–spring could belong to the SBS or be a migrating part of the BNPS. Perez et al.…”

Section: Discussionmentioning

confidence: 99%

Dynamics of the Confluence of Malvinas and Brazil currents, and a southern Patagonian spawning ground, explain recruitment fluctuations of the main stock of Illex argentinus

Alberto

Bodnariuk

Ivanovic

et al. 2020

Fisheries Oceanography

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The Argentine shortfin squid (Illex argentinus) sustains one of the world's largest squid fisheries. This squid presents strong interannual fluctuations in abundance, attributed to its semelparous life strategy coupled with environmental influences on recruitment. Several stocks have been identified, but the south patagonic stock (SPS) is the most abundant and the main support (ca. 80%) of the Argentine fishery. SPS spawns in autumn–winter, but there are controversies regarding the spawning ground location. We studied the relationship between the recruitment variability and oceanographic conditions to which eggs and paralarvae are exposed, considering two possible spawning ground locations: Patagonia and Southern Brazil. We tested the hypothesis that the SPS recruitment variability could be controlled by oceanographic fluctuations related to the transport of the egg masses spawned on each of the two grounds, to their retention on the continental shelf and to the attainment of the thermal habitat required for eggs hatching. We used a 24‐ years long time series (1993–2017) of catch per unit effort of the squid fishery, and a shorter stock‐assessment series as recruitment proxies; and satellite data of SST and of geostrophic velocities derived from sea surface height. This information was employed to model the advection of the squid egg masses along the external shelf and slope and to estimate the annual recruitment success. Results show that if spawning occurs in Patagonia, 52% of the recruitment variability could be explained. On the other hand, if spawning occurs in southern Brazil, it does not result in successful recruitments for the SPS.

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“…Ilex argentinus emerged as the second most important resource for SFSs in our study. This squid species is associated with the Brazil-Malvinas Confluence and predominantly inhabits the upper slope, with adults preferring deeper waters compared to juveniles (Haimovici et al, 1998). The average size of I. argentinus consumed by SFSs falls within the range of sexual maturity for male individuals (dos Santos & Haimovici, 1997;Haimovici & Alvarez-Pérez, 1990).…”

Section: Sub-antarctic Fur Sealsmentioning

confidence: 99%

Feeding habits of South American and sub‐Antarctic fur seals during their nonbreeding season in the southwestern Atlantic Ocean

Lima

Albernaz

Secchi

et al. 2023

Marine Mammal Science

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Stomach contents of South American (Arctocephalus australis) (n = 219) (SAFS) and sub‐Antarctic (A. tropicalis) (n = 37) (SFS) fur seals were opportunistically sampled from 1980 to 2021 to examine their feeding habits and resource partitioning in southern Brazil while in their nonreproductive periods. SAFSs mainly consumed abundant coastal pelagic species, such as Anchoa marinii and Doryteuthis sanpaulensis, resulting in high sexual trophic niche overlap. The frequency of occurrence (%FO) of fish prey, especially the overexploited Micropogonias furnieri, decreased between 1980–1992 and 2007–2021, while squid increased. For SFSs, offshore squids such as Ommastrephes bartramii and Illex argentinus were the most important prey considering both sexes in the long‐term. The interspecific trophic niche overlap was low, but it is likely underestimated since it increased with the inclusion of scat samples from SFSs. This sample‐size effect was also observed in Shannon's diversity index, which was lower for underrepresented SFSs. Marine debris ingestion was detected in both species (SAFS %FO = 2.7; SFS %FO = 8.3), with only flexible plastic material found. This study brings novel information on feeding habits of fur seal species in the extreme south of Brazil, as well as unprecedented information about their ecology during the nonreproductive period.

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Abundance, distribution and population dynamics of the short fin squid Illex argentinus in Southeastern and Southern Brazil

Cited by 13 publications

References 30 publications

Diversity and Distribution Patterns of Cetaceans in the Subtropical Southwestern Atlantic Outer Continental Shelf and Slope

Diversity and Distribution Patterns of Cetaceans in the Subtropical Southwestern Atlantic Outer Continental Shelf and Slope

Dynamics of the Confluence of Malvinas and Brazil currents, and a southern Patagonian spawning ground, explain recruitment fluctuations of the main stock of Illex argentinus

Feeding habits of South American and sub‐Antarctic fur seals during their nonbreeding season in the southwestern Atlantic Ocean

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