Reproductive biology of the school shark, Galeorhinus galeus, off Argentina: support for a single south western Atlantic population with synchronized migratory movements

Lucifora, Luis O.; Menni, Roberto Carlos; Escalante, Alicia H.

doi:10.1007/s10641-004-0305-6

Cited by 39 publications

(53 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The highly digested state of squid remains found in the stomachs (often only beaks and a few soft tissues) indicates that they were consumed some days before the sharks were caught. This agrees with the hypothesized northwards migration of male G. galeus from Patagonian waters in fall (Lucifora et al 2004). …”

Section: Food Habits and Foraging Strategysupporting

confidence: 90%

“…There is also an ontogenetic shift in the foraging behaviour because juveniles have a foraging strategy specialized in demersal teleosts while adults (in seasons other than summer) have a generalist strategy. This variation is to be expected for a predator that spends part of the year in shallow coastal waters and part in outer continental shelf waters (Menni 1985, Menni et al 1986, Peres & Vooren 1991, Vooren 1997, West & Stevens 2001, Lucifora et al 2004 where foraging opportunities are different.…”

Section: Food Habits and Foraging Strategymentioning

confidence: 89%

“…spring to fall), when it is taken in a hook-and-line recreational shark fishery occurring in the outer part of the bay, mostly at depths between 5 and 20 m (Lucifora et al 2004). Sam-ples for the present study were taken from this fishery from October to April in the fishing seasons of 1998-1999, 1999-2000 and 2000-2001. Food habits.…”

Section: Methodsmentioning

confidence: 99%

“…Total length (TL) was measured and sex and maturity were determined by examining the reproductive organs. Enlarged uteri and oviducal glands were considered to indicate mature females, while both the presence of convoluted epididymi and the degree of clasper calcification were used to determine maturity in males (Peres & Vooren 1991, Lucifora et al 2004). The samples consisted of 241 adult females (>124 cm TL), 45 juvenile females (<124 cm TL), 108 adult males (>119 cm TL), and 14 juvenile males (<119 cm TL).…”

Section: Methodsmentioning

confidence: 99%

“…Remarkably, I. argentinus is uncommon in the study area during fall, when it is concentrated in north Patagonian shelf waters south of Anegada Bay (Brunetti et al 1998). In fall, most adult Galeorhinus galeus in the study area are males (Lucifora et al 2004), which are concentrated in the north Patagonian gulfs during the summer (42 to 44°S, Elías et al 2004). This suggests that male G. galeus are sympatric with I. argentinus and may prey on it in the north Patagonian shelf.…”

Section: Food Habits and Foraging Strategymentioning

confidence: 97%

See 4 more Smart Citations

Food habits, selectivity, and foraging modes of the school shark Galeorhinus galeus

Lucifora¹,

García²,

Menni³

et al. 2006

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

The foraging ecology of the school shark Galeorhinus galeus was studied in Anegada Bay, Argentina, during the seasonal occurrence of this species in Argentinean waters (October to April) from 1998 to 2001. Of the 408 individuals examined, 168 (41.2%) had food remains in their stomachs. The proportion of individuals with food remains was negatively correlated with total length. In general, the diet was composed mainly of teleosts (98.5% IRI [index of relative importance]

show abstract

Section: Food Habits and Foraging Strategysupporting

confidence: 90%

Section: Food Habits and Foraging Strategymentioning

confidence: 89%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Food Habits and Foraging Strategymentioning

confidence: 97%

See 3 more Smart Citations

Food habits, selectivity, and foraging modes of the school shark Galeorhinus galeus

Lucifora¹,

García²,

Menni³

et al. 2006

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

show abstract

Species identification and comparative population genetics of four coastal houndsharks based on novel NGS‐mined microsatellites

Maduna

Rossouw

Silva³

et al. 2017

Ecology and Evolution

View full text Add to dashboard Cite

The common smooth-hound (Mustelus mustelus) is the topmost bio-economically and recreationally important shark species in southern Africa, western Africa, and Mediterranean Sea. Here, we used the Illumina HiSeq™ 2000 next-generation sequencing (NGS) technology to develop novel microsatellite markers for Mustelus mustelus. Two microsatellite multiplex panels were constructed from 11 polymorphic loci and characterized in two populations of Mustelus mustelus representative of its South African distribution. The markers were then tested for cross-species utility in Galeorhinus galeus, Mustelus palumbes, and Triakis megalopterus, three other demersal coastal sharks also subjected to recreational and/or commercial fishery pressures in South Africa. We assessed genetic diversity (N A , A R , H O , H E, and PIC) and differentiation (F ST and D est ) for each species and also examined the potential use of these markers in species assignment. In each of the four species, all 11 microsatellites were variable with up to a mean N A of 8, A R up to 7.5, H E and PIC as high as 0.842. We were able to reject genetic homogeneity for all species investigated here except for T. megalopterus. We found that the panel of the microsatellite markers developed in this study could discriminate between the study species, particularly for those that are morphologically very similar. Our study provides molecular tools to address ecological and evolutionary questions vital to the conservation and management of these locally and globally exploited shark species. K E Y W O R D Scross-amplification, Galeorhinus galeus, Illumina sequencing, microsatellites, Mustelus mustelus, Mustelus palumbes, Triakis megalopterus | INTRODUCTIONSharks play a crucial role in maintaining the ecological balance in marine ecosystems as keystone species, yet these animals are gradually declining worldwide in seascapes heavily impacted by humans (Dulvy et al., 2014). Such declines in wild populations not only will have negative ecological impacts on lower trophic species (Price, O'Bryhim, Jones, & Lance, 2015) but can also alter the levels and distribution of | 1463genetic diversity among populations (Dudgeon et al., 2012). It is likely that sharks may not respond well to population declines compared to other marine fishes owing to their K-selected life-history traits, i.e., slow growth, late maturity, and low reproductive outputs (Compagno, 1984;Ebert, Fowler, Compagno, & Dando, 2013). This highlights the need for conservation and management measures to ensure the sustainable utilization of these fishery resources. Implementing such measures often requires information on fishery dynamics, biological and baseline ecological data which in most cases are not yet available (Velez-Zuazo, Alfaro-Shigueto, Mangel, Papa, & Agnarsson, 2015).Molecular approaches have been very useful in providing insight into historical and contemporary demography of various commercially important shark species, especially with respect to population connectivity, stock structure, and m...

show abstract

Marine protected areas are not representative of chondrichthyan species assemblages in the Southwest Atlantic

et al. 2021

View full text Add to dashboard Cite

Reproductive biology of the school shark, Galeorhinus galeus, off Argentina: support for a single south western Atlantic population with synchronized migratory movements

Cited by 39 publications

References 15 publications

Food habits, selectivity, and foraging modes of the school shark Galeorhinus galeus

Food habits, selectivity, and foraging modes of the school shark Galeorhinus galeus

Species identification and comparative population genetics of four coastal houndsharks based on novel NGS‐mined microsatellites

Marine protected areas are not representative of chondrichthyan species assemblages in the Southwest Atlantic

Contact Info

Product

Resources

About