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7 results for “Asian shore crabs”
Figure 5 in Ectosymbionts of the non-indigenous Asian shore crab, Hemigrapsus sanguineus (Decapoda: Varunidae), in the western north Atlantic, and a search for its parasites
Figure 5. (A) Dorsal view of Carcinus maenas male (56.4 mm CW; injury to carpus of right cheliped) with five barnacles Semibalanus balanoides located in grooves around the mesogastric region of the carapace. Small colonies of Conopeum tenuissimum are scattered on the carapace. Arrow points to the opening of a Sabellaria vulgaris tube in the right hepatic area. (B) Dorsal view of Panopeus herbstii female (23.5 mm CW; right cheliped and two left walking legs missing) with large Conopeum tenuissimum colony on right side spanning frontal, progastric, hepatic, and branchial areas; another colony on carpus of the left cheliped. One large colony of Alcyonidium albescens on left side (arrow).
Figure 3 in Ectosymbionts of the non-indigenous Asian shore crab, Hemigrapsus sanguineus (Decapoda: Varunidae), in the western north Atlantic, and a search for its parasites
Figure 3. (A) Frequency of Conopeum tenuissimum versus CW (1.0 mm classes) of Hemigrapsus sanguineus collected March and April 2006 at Townsends Inlet, New Jersey. Open bars, total crabs examined (n5281); shaded bars, crabs with bryozoans (n5156). (B) Number of colonies of Conopeum tenuissimum (n5638) on specimens of Hemigrapsus sanguineus (n5119; 1.0 mm CW classes) collected March 2006 at Townsends Inlet, New Jersey. Regression equation: y (no. colonies)527.518+0.681x (CW); r250.281, p 0.0001, n5119.
Figure 2 in Ectosymbionts of the non-indigenous Asian shore crab, Hemigrapsus sanguineus (Decapoda: Varunidae), in the western north Atlantic, and a search for its parasites
Figure 2. Ventral view of Hemigrapsus sanguineus female (26.1 mm CW; same crab as Figure 1B) with a gaping abdomen caused by the accumulation of young blue mussels Mytilus edulis attached to the pleopods (white arrow shows largest mussel, 9.5 mm long). Colonies of the calcareous bryozoan Conopeum tenuissimum present on many of the pereopods. Black arrow points to the polychaete Spirorbis sp.
Figure 4 in Ectosymbionts of the non-indigenous Asian shore crab, Hemigrapsus sanguineus (Decapoda: Varunidae), in the western north Atlantic, and a search for its parasites
Figure 4. Percentages of colonies of Conopeum tenuissimum at various locations on the carapace of Hemigrapsus sanguineus based on 336 colonies from 134 crabs (Table III) collected 29 March 2006 and 26 April 2006 at Townsends Inlet. Anterolaterally are hepatic areas, posterolaterally are branchial areas; numbers in parentheses are for colonies that span the hepatic-branchial regions. Medially from anterior to posterior are frontal, progastric, mesogastric, cardiac, and intestinal locations.
Figure 1 in Ectosymbionts of the non-indigenous Asian shore crab, Hemigrapsus sanguineus (Decapoda: Varunidae), in the western north Atlantic, and a search for its parasites
Figure 1. Dorsal views of Hemigrapsus sanguineus with colonies of Conopeum tenuissimum and other ectosymbionts, collected intertidally in New Jersey. (A) Female (27.4 mm CW; first left walking leg missing) with several colonies on the carapace and on the pereopods. Arrow shows a large colony of Alcyonidium albescens covering the left posterior quadrant of the carapace. (B) Female (26.1 mm CW; same crab with mussels under abdomen, Figure 2) showing Conopeum tenuissimum colony spanning the left hepatic-branchial region of the carapace, a small medial colony and a colony in the right hepatic region, plus numerous colonies on the pereopods. (C) Male (18.5 mm CW) with a single colony of Conopeum tenuissimum covering more than half of the carapace, with some smaller colonies on the pereopods. (D) Female (24.9 mm CW; left cheliped missing) with four colonies of Conopeum tenuissimum on the carapace, two in hepatic and two in branchial areas. Barnacle is Semibalanus balanoides.
Aerial metabolic rates of the Asian shore crab Hemigrapsus sanguineus
<p>Rapid warming in the Gulf of Maine may influence the success or invasiveness of the Asian shore crab, <em>Hemigrapsus sanguineus</em>. To better predict the effects of climate change on this invasive species, it is necessary to measure its energy dynamics under a range of conditions. However, previous research has only focused on the metabolism of this intertidal species in water. We sampled adult crabs from three different sites and measured their metabolic rates in air. We show that metabolic rate increases with body mass and the number of missing limbs, but decreases with the number of regenerating limbs, possibly reflecting the timing of energy allocation to limb regeneration. Importantly, metabolic rates measured here in air are ~4× higher than metabolic rates previously measured for this species in water. Our results provide baseline measurements of aerial metabolic rates across body sizes, which may be affected by climate change. With a better understanding of respiration in <em>H. sanguineus</em>, we can make more informed predictions about the combined effects of climate change and invasive species on the northeast coasts of North America.</p>
Aerial metabolic rates of the Asian shore crab Hemigrapsus sanguineus
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