Topic
Squilla
About: Squilla is a research topic. Over the lifetime, 120 publications have been published within this topic receiving 1054 citations.
Papers published on a yearly basis
1 / 2
Papers
TL;DR: Although the two littoral prawns in Gullmar Fjord enable the two species to coexist in certain habitats, their habitat segregation still appears to be of primary importance to reduce competition between them.
Abstract: Berglund, A. 1980. Niche differentiation between two littoral prawns in Gullmar Fjord, Sweden: Palaemon adspersus and P. squilla. - Holarct. Ecol. 3: 111-115. Palaemon squilla (L.) at the Swedish west coast occurred on bottoms covered with Zostera marina L., on bare sand bottoms, in moving water and in rock pools, while P. adspersus Rathke was found on Zostera covered bottoms only. During summer 1978 the increase in length of P. adspersus was 2.2 times greater than that of P. squilla, the former species also attaining a larger maximal size. Laboratory studies showed a wide tolerance in both species to combinations of temperature and salinity. P. squilla tolerated higher temperatures than P. adspersus. The locomotory activity of P. squilla was more than twice that of P. adspersus and concentrated to the dark period. Stomach analyses revealed no interspecific differences in food selection. P. squilla appears to be an opportunistic species able to survive in many different habitats, with a higher dispersal ability, smaller size and larger tolerance to extreme values of abiotic parameters, while P. adspersus is a K-strategist with a high competitive ability, a larger proportion of availably energy devoted to growth, and with larger body size and lower mobility. Although these differences enable the two species to coexist in certain habitats, their habitat segregation still appears to be of primary importance to reduce competition between them.
66 citations
TL;DR: The results of this study showed that all the samples possess an appreciable quantities of all the dietary elements tested for, which, more or less could make them partial or complete substitutes for the conventional feed sources.
Abstract: A trial was conducted to assess the nutrient composition of some novel feed ingredients so as to enhance livestock development and human protein intake. Ten (10) unconventional protein sources which include fish, crayfish, frog, shrimps, crabs, squilla, toads and grasshopper were harvested, processed and analyzed for their proximate and mineral (macro) composition using internationally established procedures. The results showed that the samples had percent crude protein that ranged from 28.14 (crab) to 61.38 (local fish meal). Frog, toad, squilla, crayfish, pellonula and crab respectively recorded appreciable percent ether extract (EE) values of 9.14, 8.74, 7.21, 6.32, 6.26 and 6.02. The gross energy (kcal/g) value was highest for squilla (2.97), followed closely by crayfish (2.87), Pellonula (2.85), mudskipper (2.84) while the others were below 2.0kcal /g. The crab gave the highest percent ash content (39.11) while the local fish meal gave the least value (5.96). Local fishmeal had the highest percentage of calcium (2.56%) followed by Pellonula (1.94%) and Mudskipper (1.89%) while the others had values that were lower than 1%. Percent Phosphorus followed a similar trend as calcium with local fishmeal recording the highest value of 1.92%. The results of this study showed that all the samples possess an appreciable quantities of all the dietary elements tested for, which, more or less could make them partial or complete substitutes for the conventional feed sources.
45 citations
TL;DR: The effect of increased habitat heterogeneity in tidal areas on coexistence between Palaemon prawns was studied at eight sites along the European Atlantic coast and it is concluded that these species are sensitive to the extremes in salinity, temperature or O2 levels characteristic of the intertidal zone.
Abstract: The effect of increased habitat heterogeneity in tidal areas on coexistence between Palaemon prawns was studied at eight sites along the European Atlantic coast. Two species which are sympatric in non-tidal areas, Palaemon adspersus Rathke and P. squilla (L.) are largely allopatric in tidal areas, and the sympatric size difference decreases in allopatry. In tidal areas the smaller species, P. squilla, is restricted to brown algal belts and rockpools. A third species, P. serratus (Pennant), larger than the others, occurs under oceanic salinities in subtidal brown algal belts and there has forced P. squilla to restrict its habitat distribution to adjacent intertidal rockpools. At estuarine salinities, however, P. squilla also inhabits the brown algal belts. A larger diel variation in stomach fullness index in P. squilla than in P. adspersus persists in non-tidal areas. Abiotic factors probably restrict the two largest species, viz. P. adspersus and P. serratus, to subtidal environments; these species are sensitive to the extremes in salinity, temperature or O2 levels characteristic of the intertidal zone. Competition and/or predation probably relegates P. squilla to the intertidal zone. In non-tidal areas, where this zone is reduced, P. squilla increases its niche width and coexists with P. adspersus, and the size differentiation associated with sympatry may reduce interspecific competition.
38 citations
1 Dec 2014
32 citations
TL;DR: Results indicate that Squilla haemolymph performs immunosurveillance, through rapid changes in haemocyte distribution, increase of antimicrobial and antioxidant enzymes and secretion of lectins stimulating agglutination, phagocytosis and encapsulation.
28 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 1 |
| 2018 | 2 |
| 2017 | 3 |
| 2016 | 5 |
| 2015 | 4 |
| 2014 | 6 |