A preliminary investigation of the effect of sea temperature fluctuations and wind direction on catches of chokka squid<i>Loligo vulgaris reynaudii</i>off the Eastern Cape, South Africa

Sauer, W. H. H.; Goschen, Wayne S.; Koorts, A. S.

doi:10.2989/025776191784287466

Cited by 16 publications

(8 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where the temperature is one of the main environmental variables involved in the 378 inshore spawning migration of this species (Sauer et al, 1991;Roberts, 1998). In agreement with the results reported here, relatively small areas (e.g., those 398 bounded by red circles in Fig.…”

Section: Sampling Strategy 139 140supporting

confidence: 85%

Using artificial devices for identifying spawning preferences of the European squid: Usefulness and limitations

et al. 2014

View full text Add to dashboard Cite

Section: Sampling Strategy 139 140supporting

confidence: 85%

Using artificial devices for identifying spawning preferences of the European squid: Usefulness and limitations

et al. 2014

View full text Add to dashboard Cite

“…Augustyn, 1990Augustyn, , 1991Sauer et al, 1991;. Olyott et al (2006) studied spatio-temporal patterns in maturation of this species off the coast of South Africa, relating maturity cycles to environmental conditions, finding that squid matured smaller in winter/spring than in summer/ autumn and that squid in the east Agulhas Bank matured at a smaller size than squid in the west.…”

Section: Cephalopod-environment Relationships In Other Areasmentioning

confidence: 99%

“…In the early 1990s, some authors started to describe relationships between temperature and distribution or abundance for various squid species, initially in South Africa (e.g. Augustyn, 1990Augustyn, , 1991Sauer et al, 1991; and later in Europe (e.g. Rasero, 1994;.…”

Section: Introductionmentioning

confidence: 99%

A review of cephalopod–environment interactions in European Seas

et al. 2008

View full text Add to dashboard Cite

Cephalopods are highly sensitive to environmental conditions and changes at a range of spatial and temporal scales. Relationships documented between cephalopod stock dynamics and environmental conditions are of two main types: those concerning the geographic distribution of abundance, for which the mechanism is often unknown, and those relating to biological processes such as egg survival, growth, recruitment and migration, where mechanisms are sometimes known and in a very few cases demonstrated by experimental evidence. Cephalopods seem to respond to environmental variation both 'actively' (e.g. migrating to areas with more favoured environmental conditions for feeding or spawning) and 'passively' (growth and survival vary according to conditions experienced, passive migration with prevailing currents). Environmental effects on early life stages can affect life history characteristics (growth and maturation rates) as well as distribution and

show abstract

“…Squid abundance has been related to temperature changes (Sauer et al ., 1991; Dawe and Warren, 1993; Roberts and Sauer, 1994; Pierce, 1995; Yatsu and Watanabe, 1996), upwelling intensity (Costa and Fernandes, 1993; Rasero, 1994; Roberts and Sauer, 1994), salinity (Laughlin and Livingston, 1982; Yatsu and Watanabe, 1996), mixing and currents (Rees and Lumby, 1954; Sauer et al ., 1991; Costa and Fernandes, 1993; Roberts and Sauer, 1994; Pierce, 1995) and zooplankton abundance (Laughlin and Livingston, 1982). Even though potential causes of variations in octopus abundance have not been as intensively studied, some examples demonstrate relationships between fluctuations of catches or CPUE (catch per unit effort) and changes in temperature (Manami, 1985), salinity (Kubo, 1935; Hartwick et al ., 1984; Takeda, 1990) or upwelling intensity (Sy‐Moussa and Tchernichkov, 1985).…”

Section: Introductionmentioning

confidence: 99%

The importance of retention processes in upwelling areas for recruitment of Octopus vulgaris: the example of the Arguin Bank (Mauritania)

Faure¹,

Inejih

Demarcq³

et al. 2000

Fisheries Oceanography

View full text Add to dashboard Cite

The relationship between recruitment of octopus (Octopus vulgaris) populations and environmental conditions off the Arguin Bank (Mauritania) in the main nursery ground was investigated between 1990 and 1996. Three environmental indices (coastal upwelling intensity, coastal retention and wind‐induced turbulence indices) are derived from satellite infrared imagery (METEOSAT) and from the COADS (Comprehensive Ocean–Atmosphere Data Set) data to quantify the coastal retention process and productivity, both believed to be important factors for recruitment success. The octopus recruitment index as well as environmental indices fluctuate annually and seasonally. Linear regression and generalized additive models (GAM) are used to relate recruitment indices and the environmental conditions prevailing during the early‐life planktonic stage, known to be the main critical period of the octopus life cycle. Coastal retention especially appears to be a key factor for recruitment success. Owing to seasonal variations in enrichment and mixing processes, larvae benefit from retention in the spring but are negatively affected by a breakdown in retention in the autumn. Increasing upwelling intensity is beneficial for octopus recruitment, as the Arguin Bank limits the detrimental dispersive effects linked to upwelling.

show abstract

A preliminary investigation of the effect of sea temperature fluctuations and wind direction on catches of chokka squidLoligo vulgaris reynaudiioff the Eastern Cape, South Africa

Cited by 16 publications

References 5 publications

Using artificial devices for identifying spawning preferences of the European squid: Usefulness and limitations

Using artificial devices for identifying spawning preferences of the European squid: Usefulness and limitations

A review of cephalopod–environment interactions in European Seas

The importance of retention processes in upwelling areas for recruitment of Octopus vulgaris: the example of the Arguin Bank (Mauritania)

Contact Info

Product

Resources

About