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6 results for “Panopeus”
Rates of consumption of marsh periwinkles (Littoraria irrorata) by mud crabs (Eurytium limosum and Panopeus obesus) between August and December in a Georgia salt marsh
Predatory mud crabs (Panopeus obesus and Eurytium limosum) are two of the main resident infaunal predators in southeastern US salt marshes.The relative importance of the two species in the trophic control of marsh periwinkles (snails; Littoraria irrorata) is likley to change across seasons. We therefore manipulated the these predator species (Panopeus obesus and Eurytium limosum) in experimental cages in the field (at Dean Creek, Sapelo Island, GA) and assessed monthly predation rates over four months, between 15th August to 15th December. We included 3 treatments, consisting of two treatments containing each species alone, and one containing both species together; all treatments had the same density. Specifically, 1) 4 x Panopeus individuals; 2) 4 x Eurytium individuals; 3) 2 x Panopeus individuals + 2 Eurytium individuals. Only adult crabs (33-40mm carapace diameter) were used. We maintained the treatments over 4 months (15th Aug - 15th Dec 2009), replacing any missing crabs every two weeks and counting the number of snails killed by predators each month.
Effects of the relative abundance of predatory mud crabs (Panopeus obesus and Eurytium limosum) on abundances of snails and fiddler crabs in a Georgia salt marsh
Predatory mud crabs (Panopeus obesus and Eurytium limosum) are two of the main resident infaunal predators in southeastern US salt marshes. Little is known, however, about their effects on important prey species. These influences are llikely to be dependent on the identity and relative abundances of the two predator species. We therefore manipulated the relative abundances of Panopeus and Eurytium in experimental cages in the field (at Airport Marsh, Sapelo Island, GA). We maintained the treatments over 4 months (July - October 2011), before assessing impacts on predator limb loss (an indicator of interspecific antagonism) and prey densitities (small and large mud fiddler crabs and marsh periwinkles).
Experimental manipulation of predatory crab species identity (Panopeus obesus vs. Eurytium limosum) and size-structure and assessment of effects on invertebrate densities, sediment properties and plant biomass.
Predatory mud crabs (Panopeus obesus and Eurytium limosum) are two of the main resident infaunal predators in southeastern US salt marshes. Little is known, however, about their effects on important prey species, or their influences on sediment or plant properties. These influences are likely to be dependent on the identity of species and the size-stucture of the population. We therefore manipulated the species identity (Panopeus or Eurtium) and size-structure. The size-structure treatrment had four levels: small [9 individuals, each 18-22mm carapace diameter], medium [6 ind. 24 -28mm], large [3 ind. 32-36mm], mixed (3 small, 2 medium, 1 large, all within same cage). The numbers of crabs in each size-structure treatment were chosen to capture natural size-abundance relationships. The treatments were maintained in experimental cages (70 x 70 x 100 cm, length, width, height) in the mid-Spartina zone at Dean Creek, Sapelo Island, GA. We maintained the treatments over 4 months (July - October 2010), before assessing impacts on prey densitities (mud fiddler crabs, ribbed mussels and marsh periwinkles), and ecosystem properties (aboveground plant biomass, sediment redox potential, sediment water content).
Figure 2 in Microdistribution of juveniles and adults of the mud crab Panopeus americanus (Brachyura, Panopeidae) in a remnant mangrove area in the southwest Atlantic
Figure 2. Size-class frequency distribution of individuals of the narrowback mud crab Panopeus americanus in the three intertidal zones sampled (zone A: adjacent to the dry zone and farthest from the waterline; zone B: middle intertidal; zone C: lower intertidal, nearest the waterline).
Figure 3 in Microdistribution of juveniles and adults of the mud crab Panopeus americanus (Brachyura, Panopeidae) in a remnant mangrove area in the southwest Atlantic
Figure 3. Abundance of individuals of the narrowback mud crab Panopeus americanus among the sampling zones (zone A: adjacent to the dry zone and farthest from the waterline; zone B: middle intertidal; zone C: lower intertidal, nearest the waterline). Values followed by at least one same letter, in the same group, do not differ statistically (P.0.05).
Figure 1 in Microdistribution of juveniles and adults of the mud crab Panopeus americanus (Brachyura, Panopeidae) in a remnant mangrove area in the southwest Atlantic
Figure 1. Mean size variation (carapace width) of individuals of the narrowback mud crab Panopeus americanus collected in the Araçá region (zone A: adjacent to the dry zone and farthest from the waterline; zone B: middle intertidal; zone C: lower intertidal, nearest the waterline). Values followed by at least one same letter, in the same group, differ statistically (P,0.05).
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OpenNeuro
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