This digital document is a journal article from Journal of Experimental Marine Biology and Ecology, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

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Temperature determines all physiological responses by limiting cellular reaction rates. Daily temperature variation differs between microhabitats, which means that subpopulations of the same species may respond differently to temperature. The aim of this study is to determine how physiological responses to temperature of the limpet Cellana tramoserica differ between limpets from variable and from stable thermal environments. Oxygen consumption and anaerobic and aerobic metabolic capacities were measured over a range of temperatures in limpets from thermally stable and variable field sites in summer and winter, and in laboratory acclimation treatments. Limpets from both variable and stable sites, showed acclimatisation of anaerobic and aerobic potentials. Limpets from stable environments, but not from variable environments, showed increased oxygen consumption in winter. Comparison of field and laboratory data showed that temperature was the signal for acclimatisation. The physiological response of C. tramoserica to temperature depends on season and microhabitat. Care must therefore be taken when conducting interspecies comparisons of response to temperature to address the confounding effects of phenotypic plasticity. Differences in physiological response to temperature in phenotypically flexible species like C. tramoserica may simply reflect individual reactions to immediate environmental conditions.

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6 Large Polished Hawaiian Oval Limpets Shells Seashells 2"-2.5" Craft

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This digital document is a journal article from Journal of Experimental Marine Biology and Ecology, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
Spatial and trophic competitive interactions were analysed for the seldom-studied limpet Patella ferruginea (which is considered as an ”extinction risk”). Spatial patterns of distribution of P. ferruginea were studied using quadrats of 1×1 m^2 at several transects along the coastline, whereas trophic interactions were studied through manipulations of densities of P. ferruginea and Patella caerulea in experimental plots located at the mid-shore. Physical parameters were measured inside each plot to determine the microenvironmental differences between fenced and unfenced plots. Fenced plots of 50×50 cm^2 were used with six different treatments. Mortality was recorded every 15 days and length was measured monthly during the 3.5 months of the experiment. At the beginning and end of the experiment, lengths and weights of limpets were recorded and chlorophyll concentration was measured by spectrophotometric analysis of rock surface. Both species showed increased mortality and reduced size and weight in treatments with greater densities. High intraspecific competition was detected in P. caerulea compared with P. ferruginea whereas asymmetrical interspecific competition was observed. The results suggest that P. caerulea is the superior competitor, possibly due to differences in radular morphology and mobility between the two species. Microalgal food assessment showed that it is probably a limiting resource, especially for P. caerulea, although this species has a lower biomass than P. ferruginea. The high intraspecific competition observed in P. caerulea could be responsible for the coexistence of both species. The present study may be useful in helping to conserve P. ferruginea, which is presently under serious threat of extinction, because the results show that experimental fences are a viable means of concentrating breeding individuals.

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Modelling limpet dynamics in space and time (Department of Marine Ecology, Göteborg University)

Large (24 cm. tall) paperback. Text is in Englihs. Several graphs.

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6. Which of the following organisms is not a bivalve? (Points : 3)
quahog
oyster
mussel
limpet

7. Porifera pull bacteria and small plankton from water that circulates through their bodies. This form of feeding is called _________________. (Points : 3)
raptorial feeding
suspension feeding
filter feeding
ambush feeding

8. Asconoid, syconoid, and leuconoid are all examples of ___________________. (Points : 3)
specific shaped sponges
types of coral
scales found on Porifera
skeletal cell types of sponges

9. Spicules are supporting cells that act like that of a skeletal system in sponges. Spicules can be made of any of the following substances except ________________. (Points : 3)
calcium carbonate
silica
spongin
cellulose

10. Which of the following is not a way that some gastropods get food? (Points : 3)
pack hunting
scavenging
solitary hunting
filter feeding

11. The body cavity, coelom, of a mollusk contains a definite _________________. (Points : 3)
reproductive system
respiratory system
muscular system
digestive and intestinal system

12. Echinoderms such as sea stars and sea cucumbers are famous for their ability to _________ body parts once eviscerated or removed from the main body. (Points : 3)
regenerate
move
camouflage
retrieve

13. Simple marine worms belong to the phylum __________________. (Points : 3)
Aschelhelminthes
Platylhelminthes
Nemertea
Annelida

14. Which group of mollusks show the least amount of cephalization? (Points : 3)
pelecypods
gastropods
cephalopods
crustaceans

15. “Stomach-footed” mollusks are also called ________________. (Points : 3)
gastropods
pelecypods
cephalopods
molluskopods

16. Unlike most cephalopods, the ________________ has an external shell. (Points : 3)
octopus
cuttlefish
squid
nautilus

17. Layers of gills called book lungs are associated with _________________. (Points : 3)
shrimp
clams
horseshoe crabs
lobster

18. Which of the following is a member of the class Asteroidea? (Points : 3)
sea lily
sea feather
sea star
sea cucumber

19. The gastric cavity of the Cnidarians is called the _________________. (Points : 3)
coelenteron
stomach
intestine
blastophore

20. A __________ appears green to brown or yellow-brown in color, with many twisting grooves that are typically lighter in color. (Points : 3)
clubbed finger coral
common brain coral
great star coral
ivory bush coral

21. Because of their symbiotic photosynthetic algae, corals are net ______________. (Points : 3)
producers
consumers
scavengers
decomposers

22. The major predators of Porifera are ___________________. (Points : 3)
turtles
fish
eels
humans

23. Which of the following is not a type of symbiotic relationship? (Points : 3)
commensalism
scavenging
mutualism
parasitism

24. Which gastropod has lost its shell completely? (Points : 3)
octopus
cowry
abalone
nudibranch

25. Sponge fishing meccas in Florida, USA are _________________. (Points : 3)
Tarpon Springs and Clearwater
Key West and Miami
Boca Raton and Ft. Lauderdale
Tarpon Springs and Key West

26. Pelecypods are also known as ________________. (Points : 3)
bivalves
snails
conchs
squid

27. Polychaetes have a complete digestive tract, internal organs, excretory system, and reproductive system and belong to the phylum _________________. (Points : 3)
Aschelhleminthes
Nemertea
Platylhelminthes
Annelida

28. The larval form of a mollusk is called a ________________. (Points : 3)
tropophore
planula
veliger
fry

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6 hours of night-time feeding compressed into 5 seconds. Takne on a night-time low spring tide in Kimmeridge Bay, Dorset