| phylogeny of the haplosporidia (eukaryota: alveolata) based on small subunit ribosomal rna gene sequence. | the phylogenetic position of the phylum haplosporidia was investigated with the complete small subunit rrna gene sequences from 5 species in the phylum: haplosporidium nelsoni and haplosporidium costale, parasites of the eastern oyster crassostrea virginica; haplosporidium louisiana, a parasite of the mudcrab panopeus herbstii; minchinia teredinis, a parasite of shipworms (teredo spp.) and urosporidium crescens, a hyperparasite found in metacercariae of the trematode megalophallus sp. in the blu ... | 1996 | 8691370 |
| effects of experience on crab foraging in a mobile and a sedentary species | the effects of experience on prey and prey-patch choice were compared between two species of marine predatory crabs. the blue crab, callinectes sapidus rathbun, is highly mobile and forages in a variety of estuarine and lagoonal habitats. the atlantic mud crab, panopeus herbstii h. milne-edwards, is smaller and less mobile and is found mostly in oyster reefs and on shelly bottoms. in the laboratory, crabs were offered a choice between two prey types (juvenile hard clams, mercenaria mercenaria li ... | 1997 | 9236012 |
| simulated predator extinctions: predator identity affects survival and recruitment of oysters. | the rate of species loss is increasing at a global scale, and human-induced extinctions are biased toward predator species. we examined the effects of predator extinctions on a foundation species, the eastern oyster (crassostrea virginica). we performed a factorial experiment manipulating the presence and abundance of three of the most common predatory crabs, the blue crab (callinectes sapidus), stone crab (menippe mercenaria), and mud crab (panopeus herbstii) in estuaries in the eastern united ... | 2008 | 18409432 |
| you are what you eat: a metabolomics approach to understanding prey responses to diet-dependent chemical cues released by predators. | prey responses to predator cues are graded in intensity in accordance with the degree of threat presented by the predator. in systems in which prey gather information on predators by using chemicals, prey often respond more to the odor of predators that have consumed conspecifics, as opposed to heterospecifics. we investigated the response of a prey species, the mud crab, panopeus herbstii, to urine of blue crab, callinectes sapidus, fed mud crabs or oysters. behavioral analysis was combined wit ... | 2016 | 27683309 |
| predator-prey interactions mediated by prey personality and predator hunting mode. | predator-prey interactions are important drivers in structuring ecological communities. however, despite widespread acknowledgement that individual behaviours and predator species regulate ecological processes, studies have yet to incorporate individual behavioural variations in a multipredator system. we quantified a prevalent predator avoidance behaviour to examine the simultaneous roles of prey personality and predator hunting mode in governing predator-prey interactions. mud crabs, panopeus ... | 2016 | 27075257 |
| the smell of success: the amount of prey consumed by predators determines the strength and range of cascading non-consumptive effects. | we examined whether chemically mediated risk perception by prey and the effects of changes in prey behavior on basal resources vary as a function of the amount of prey biomass consumed by the predator. we studied these issues using a tritrophic system composed of blue crabs, callinectes sapidus (top predator), mud crabs panopeus herbstii (intermediate prey), and oysters crassostrea virginica (basal resource). working in a well characterized field environment where experiments preserve natural pa ... | 2015 | 26618090 |
| interactions between multiple recruitment drivers: post-settlement predation mortality and flow-mediated recruitment. | dispersal is a primary driver in shaping the future distribution of species in both terrestrial and marine systems. physical transport by advection can regulate the distance travelled and rate of propagule supply to a habitat but post-settlement processes such as predation can decouple supply from recruitment. the effect of flow-mediated recruitment and predation on the recruitment success of an intertidal species, the eastern oyster crassostrea virginica was evaluated in two-replicated field ex ... | 2012 | 22493734 |
| ocean acidification impairs crab foraging behaviour. | anthropogenic elevation of atmospheric co2 is driving global-scale ocean acidification, which consequently influences calcification rates of many marine invertebrates and potentially alters their susceptibility to predation. ocean acidification may also impair an organism's ability to process environmental and biological cues. these counteracting impacts make it challenging to predict how acidification will alter species interactions and community structure. to examine effects of acidification o ... | 2015 | 26108629 |
| trait-mediated functional responses: predator behavioural type mediates prey consumption. | the predator functional response (i.e. per capita consumption rate as a function of prey density) is central to our understanding of predator-prey population dynamics. this response is behavioural, depending on the rate of attack and time it takes to handle prey. consistent behavioural differences among conspecific individuals, termed behavioural types, are a widespread feature of predator and prey populations but the effects of behavioural types on the functional response remain unexplored. we ... | 2014 | 24749626 |
| a non-native prey mediates the effects of a shared predator on an ecosystem service. | non-native species can alter ecosystem functions performed by native species often by displacing influential native species. however, little is known about how ecosystem functions may be modified by trait-mediated indirect effects of non-native species. oysters and other reef-associated filter feeders enhance water quality by controlling nutrients and contaminants in many estuarine environments. however, this ecosystem service may be mitigated by predation, competition, or other species interact ... | 2014 | 24718023 |
| effects of leached mirex on experimental communities of estuarine animals. | experimental communities of various estuarine animals in outdoor tanks were exposed to a continuous flow of water containing mirex for 10 weeks. the mirex was leached from fire ant bait (0.3% active ingredient) by fresh water which was then mixed with salt water to yield exposure concentrations averaging 0.038 mug/l. the experiment simulated runoff from treated land into estuarine areas. mortality of grass shrimp (palaemonetes vulgaris), pin, shrimp (penaeus duorarum), common mud crabs (panopeus ... | 1976 | 999334 |