Ontogenetic changes in the natural diet of the sandy shore crab, Matuta lunaris (Forskål) (Brachyura : Calappidae)

1988 ◽  
Vol 39 (2) ◽  
pp. 193 ◽  
Author(s):  
OS Perez ◽  
DR Bellwood
Keyword(s):  
Shore Crab ◽  
Ontogenetic Changes ◽  
Natural Diet ◽  
Sandy Shore ◽  
Percentage Occurrence

During June and July, 1984, the ontogenetic changes in the composition of the natural diet of M. lunaris from Pallarenda beach, Townsville, Australia, were investigated by analyses of foregut contents using the percentage occurrence and percentage point methods. M. lunaris was found to be a predator of small crustaceans and molluscs and a facultative scavenger. There were marked changes in the composition of its diet during ontogeny: small individuals fed primarily on small crustaceans such as sergestids and copepods; large individuals fed primarily on anomurans and gastropods. The possible influence of ontogenetic changes in chelae function upon the diet is discussed.

Multifunctional behaviour in a sandy shore crab enhances performance in extreme intertidal environments

Oecologia ◽  
2018 ◽  
Vol 189 (1) ◽  
pp. 79-89 ◽  
Author(s):  
Tin Yan Hui ◽  
Felix Landry Yuan ◽  
Timothy C. Bonebrake ◽  
Gray A. Williams
Keyword(s):  
Shore Crab ◽  
Sandy Shore ◽  
Intertidal Environments

Suspension feeding in larval crabs (Carcinus maenas)

1993 ◽  
Vol 73 (1) ◽  
pp. 207-211 ◽  
Author(s):  
Jan Robert Factor ◽  
Barbara L. Dexter
Keyword(s):  
Size Range ◽  
Sea Water ◽  
Carcinus Maenas ◽  
Epifluorescence Microscopy ◽  
Shore Crab ◽  
Suspension Feeding ◽  
Natural Diet ◽  
Crab Larvae ◽  
Water Suspensions ◽  
Detrital Particles

First-stage zoeal larvae of the green (shore) crab, Carcinus maenas (Crustacea: Brachyura: Portunidae), ingested three types of particles offered in sea-water suspensions. In experiments using two types of fluorescent particles (1–2 µm and 1–7 µm ) and living Dunaliella tertiolecta cells (5–7 µm), particles were ingested in at least 40% of the zoeae examined with brightfield, darkfield, and epifluorescence microscopy. These results suggest that green crab larvae may be capable of utilizing planktonic particles in the size range of bacteria, small algal cells, and organically-enriched detrital particles in their natural diet.

Ontogenetic development of transporter regulation in bullfrog intestine

1990 ◽  
Vol 258 (5) ◽  
pp. G770-G773 ◽  
Author(s):  
E. M. Toloza ◽  
J. M. Diamond
Keyword(s):  
Glucose Uptake ◽  
Dietary Protein ◽  
Dietary Carbohydrate ◽  
Ontogenetic Changes ◽  
Uptake Capacity ◽  
Adult Individual ◽  
Natural Diet ◽  
Dietary Changes ◽  
Nutrient Transporter ◽  
Regulatory Capacity

Intestinal nutrient transporter activity is adapted to dietary substrate levels on three time scales: reversibly, within an adult individual, to rapid dietary changes; developmentally, to normal ontogenetic changes in diet; and evolutionarily, among carnivores, omnivores, and herbivores, to a species' natural diet. Does the capacity for rapid reversible adaptation itself vary adaptively during development? Substrate-dependent regulation would make functional sense in herbivorous/omnivorous tadpoles in which dietary substrate levels fluctuate unpredictably, but would serve no purpose in strictly carnivorous adult bullfrogs in which dietary protein is always high and carbohydrate is low. Hence, we fed premetamorphosis bullfrog tadpoles either boiled lettuce (high in carbohydrate, low in protein) or ground beef (high in protein, low in carbohydrate). Gut weight relative to body weight was higher in lettuce-fed tadpoles. Glucose uptake was greater and proline uptake slightly less in lettuce-fed than in beef-fed tadpoles. The resultant ratio of glucose uptake capacity to proline uptake capacity was nearly twice as high in lettuce-fed as in beef-fed tadpoles, corresponding to a much higher ratio of dietary carbohydrate to protein. Adult frogs have been shown to lack such regulation. Therefore, the regulatory capacity seen in tadpoles must become lost during amphibian metamorphosis.

scholarly journals Ontogenetic changes in the olfactory antennules of the shore crab, Hemigrapsus oregonensis , maintain sniffing function during growth

2015 ◽  
Vol 12 (102) ◽  
pp. 20141077 ◽  
Author(s):  
Lindsay D. Waldrop ◽  
Miranda Hann ◽  
Amy K. Henry ◽  
Agnes Kim ◽  
Ayesha Punjabi ◽  
...  
Keyword(s):  
Particle Image ◽  
Relative Size ◽  
Physical Models ◽  
Shore Crab ◽  
Ontogenetic Changes ◽  
Return Stroke ◽  
Critical Range ◽  
Image Velocimetry ◽  
Flow Through ◽  
Hemigrapsus Oregonensis

Malacostracan crustaceans capture odours using arrays of chemosensory hairs (aesthetascs) on antennules. Lobsters and stomatopods have sparse aesthetascs on long antennules that flick with a rapid downstroke when water flows between the aesthetascs and a slow return stroke when water is trapped within the array (sniffing). Changes in velocity only cause big differences in flow through an array in a critical range of hair size, spacing and speed. Crabs have short antennules bearing dense arrays of flexible aesthetascs that splay apart during downstroke and clump together during return. Can crabs sniff, and when during ontogeny are they big enough to sniff? Antennules of Hemigrapsus oregonensis representing an ontogenetic series from small juveniles to adults were used to design dynamically scaled physical models. Particle image velocimetry quantified fluid flow through each array and showed that even very small crabs capture a new water sample in their arrays during the downstroke and retain that sample during return stroke. Comparison with isometrically scaled antennules suggests that reduction in aesthetasc flexural stiffness during ontogeny, in addition to increase in aesthetasc number and decrease in relative size, maintain sniffing as crabs grow. Sniffing performance of intermediate-sized juveniles was worse than for smaller and larger crabs.

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