The effects of environmental factors on the embryonic survival of the Patagonian squid Loligo gahi

Cinti, Ana; Barón, Pedro J.; Rivas, Andrés Luján

doi:10.1016/j.jembe.2004.05.017

Cited by 30 publications

(35 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The short life-span of squid means that the success of the next generation relies entirely on the capacity of each generation to produce viable offspring (Boyle and Boletzky 1996). Both temperature and salinity are important factors influencing embryonic development and survival (Cinti et al 2004) and thus, factors affecting the embryonic and juvenile phases will have crucial impacts on population success. Additionally, the embryonic phase of loliginids is quite long and thus, represents a significant portion of the entire lifespan (e.g.…”

Section: Embryonic and Hatchling Phasementioning

confidence: 99%

The potential impacts of climate change on inshore squid: biology, ecology and fisheries

Pecl

Jackson

2007

Rev Fish Biol Fisheries

150

110

View full text Add to dashboard Cite

Squid are important components of many marine ecosystems from the poles to the equator, serving as both important predators and prey. Novel aspects of their growth and reproduction mean that they are likely to play an important role in the changing oceans due to climate change. Virtually every facet of squid life-history examined thus far has revealed an incredible capacity in this group for life-history plasticity. The extremely fast growth rates of individuals and rapid rates of turnover at the population level mean that squid can respond quickly to environmental or ecosystem change. Their 'life-in-the-fast-lane' lifestyle allows them to rapidly exploit 'vacuums' created in the ecosystem when predators or competitors are removed. In this way, they function as 'weeds of the sea'. Elevated temperatures accelerate the life-histories of squid, increasing their growth rates and shortening their life-spans. At first glance, it would be logical to suggest that rising water temperatures associated with climate change (if food supply remains adequate) would be beneficial to inshore squid populations and fisheries-growth rates would increase, life spans would shorten and population turnover would accelerate. However, the response of inshore squid populations to climate change is likely to be extremely complex. The size of hatchlings emerging from the eggs becomes smaller as temperatures increase and hatchling size may have a critical influence on the size-at-age that may be achieved as adults and subsequently, population structure. The influence of higher temperatures on the egg and adult stages may thus be opposing forces on the lifehistory. The process of climate change will likely result in squids that hatch out smaller and earlier, undergo faster growth over shorter life-spans and mature younger and at a smaller size. Individual squid will require more food per unit body size, require more oxygen for faster metabolisms and have a reduced capacity to cope without food. It is therefore likely that biological, physiological and behavioural changes in squid due to climate change will have far reaching effects.

show abstract

Section: Embryonic and Hatchling Phasementioning

confidence: 99%

The potential impacts of climate change on inshore squid: biology, ecology and fisheries

Pecl

Jackson

2007

Rev Fish Biol Fisheries

150

110

View full text Add to dashboard Cite

show abstract

“…Significantly fewer embryos survived to full term in salinities of 45‰ and complete mortality occurred in treatments greater than this concentration. Salinity ranges for embryonic development in cephalopods are species specific, and previous research has shown that between 34‰ and 42‰ is optimal (D'Aniello et al, 1989;Paulij et al, 1990;Cinti et al, 2004;Sen, 2004). The current study has indicated that salinity which increases above 40‰ will lead to a decrease in survivorship of S. apama embryos and that with every 1‰ increase in salinity above 40‰ survival of embryos will decrease by $7%.…”

Section: Discussionmentioning

confidence: 99%

“…Previous research on the effects of salinity within cephalopods has focused on Loligo spp., and few studies have investigated effects of salinity on Sepia spp. What has been found however is that salinity ranges for embryonic development and hatching success are species specific and higher salinities (28-38‰) appear to be optimal (Palmegiano and Dapote, 1983;Paulij et al, 1990;Cinti et al, 2004;Sen, 2005). Growth rates of cephalopods are also affected by salinity, where lower salinities increase statolith size (Villanueva et al, 2007), but also cause deformations of embryos (Paulij et al, 1990).…”

Section: Introductionmentioning

confidence: 99%

Impacts of seawater desalination on the giant Australian cuttlefish Sepia apama in the upper Spencer Gulf, South Australia

Dupavillon

Gillanders

2009

Marine Environmental Research

View full text Add to dashboard Cite

With seawater desalination expanding rapidly, it is important that ecological studies are undertaken to determine the effects of brine discharge on the marine species in the area. The abundance of giant Australian cuttlefish (Sepia apama, Gray 1849) eggs and environmental data were recorded at nine sites near Point Lowly, Spencer Gulf, South Australia, an area where the largest desalination plant in the Southern hemisphere is proposed. In addition, the effects of different concentrations of desalination brine on the growth, survival and condition of cuttlefish embryos were investigated. The primary egg-laying sites for the cuttlefish were in the vicinity of Stony Point (sites 4 and 3) and the area with the least egg abundance was on the eastern and western areas around Point Lowly (sites 9 and 7) where no eggs were found. The survival of embryos decreased with an increase in salinity, with no embryos surviving to full term in salinities greater than 50 per thousand. Mean weight and mantle length also decreased with increasing salinity. Besides elevated salinity, the brine also had increased concentrations of Ba, Ca, K, Sr and Mg relative to water near Point Lowly. Brine discharge from seawater desalination poses a potential threat to the unique spawning aggregation of the giant Australian cuttlefish, in the upper Spencer Gulf, South Australia.

show abstract

“…Means with the same letters are not significantly different b groups of embryos and may affect in some degree the results observed. Incubating loliginid eggs under constant salinities during full embryonic development period indicates that there are optimal salinities that maximise hatching success, e.g., Loligo vulgaris, 34-42& (D'Aniello et al 1989); 34-38& (Sen 2005); Loligo gahi, 26.4-32.8 & (Cinti et al 2004) and Sepioteuthis lessoniana, 21.8-36.6& (Nabhitabhata et al 2001). Coastal waters in subtropical and tropical coastal reefs are frequently exposed to heavy seasonal rain that may reduce salinity for short periods of time.…”

Section: Discussionmentioning

confidence: 99%

“…Statoliths are a very useful tool to study squid age and growth (Jackson 1994), and we know that a record of temperature effects are present in the statoliths of embryos and hatchlings (e.g., Durholtz and Lipinski 2000;Villanueva 2000a, b). However, the influence of other abiotic factors on embryonic development and hatching success in cephalopods, such as photoperiod (Paulij et al 1990a(Paulij et al , 1991, light intensity (Ikeda et al 2004), and salinity (Palmegiano and D'Apote 1983;D'Aniello et al 1989;Paulij et al 1990b;Nabhitabhata et al 2001;Cinti et al 2004;Sen 2005) is less understood. Identifying how the effect of these abiotic factors is recorded in the statolith structure will provide a useful tool when studying wild populations (Chung and Lu 2005).…”

Section: Introductionmentioning

confidence: 99%

Abiotic influences on embryo growth: statoliths as experimental tools in the squid early life history

Villanueva

Moltschaniwskyj

Bozzano

2006

Rev Fish Biol Fisheries

View full text Add to dashboard Cite

Statolith size and growth was used to determine the influence of abiotic factors on the growth of Loligo vulgaris and Sepioteuthis australis embryos. Recently spawned egg masses collected from the field were incubated in the laboratory under different levels of light intensity, photoperiod, or short periods of low salinity (30&). Double tetracycline staining was used to follow statolith growth. In L. vulgaris constant light conditions produced significantly slower growth in the embryonic statoliths and embryos held at summer photoperiod had slower statolith growth than those held at winter photoperiods. However once they hatched out there was no evidence that photoperiod affected statolith growth. After hatching, in all photoperiods statolith growth rates decreased in comparison with late embryonic rates. In S. australis embryos, differences between the high and medium light intensities for summer and intermediate photoperiods were found, suggesting that under summer incubation temperature, longer daylengths at medium light intensity favoured higher statolith growth for this species. In comparison to controls, slower statolith growth in S. australis embryos due to low salinity only occurred when exposed for 72 h. Comparison with previous studies indicates that temperature seems to be the main abiotic factor influencing statolith growth during early stages, however, interactions among all abiotic factors needs to be determined as well as the unknown influence of other isolated factors, e.g., oxygen concentration within the egg mass.

show abstract

The effects of environmental factors on the embryonic survival of the Patagonian squid Loligo gahi

Cited by 30 publications

References 20 publications

The potential impacts of climate change on inshore squid: biology, ecology and fisheries

The potential impacts of climate change on inshore squid: biology, ecology and fisheries

Impacts of seawater desalination on the giant Australian cuttlefish Sepia apama in the upper Spencer Gulf, South Australia

Abiotic influences on embryo growth: statoliths as experimental tools in the squid early life history

Contact Info

Product

Resources

About