A5037353357- Aquatic Invertebrate Ecology and Behavior
- Environmental Toxicology and Ecotoxicology
- Fish Ecology and Management Studies
- Physiological and biochemical adaptations
- Mollusks and Parasites Studies
- Orthopaedic implants and arthroplasty
- Marine Bivalve and Aquaculture Studies
- Parasite Biology and Host Interactions
- Freshwater macroinvertebrate diversity and ecology
- Soil and Water Nutrient Dynamics
- Amphibian and Reptile Biology
- Water Quality and Resources Studies
- Insect and Arachnid Ecology and Behavior
- Water Quality and Pollution Assessment
- CRISPR and Genetic Engineering
- Insect and Pesticide Research
- Environmental DNA in Biodiversity Studies
- Ocean Acidification Effects and Responses
- Aquaculture Nutrition and Growth
- Neurobiology and Insect Physiology Research
- Marine Biology and Environmental Chemistry
- Study of Mite Species
- Biomimetic flight and propulsion mechanisms
- High Altitude and Hypoxia
- Geology and Paleoclimatology Research
Missouri State University
2014-2025
United States Geological Survey
2012
Columbia Environmental Research Center
2012
Missouri Department of Conservation
2012
United States Fish and Wildlife Service
2012
Iowa State University
2008
University of Missouri
1999
University of San Diego
1992
University of California, Irvine
1987-1989
University of Calgary
1988
Freshwater mussel larval parasitism of fish is unique among bivalves. The relationship primarily phoretic rather than nutritive; only the smallest glochidia and haustorial larva grow substantially while on host. Growth larvae suggests a lower functional size limit ∼150 μm for juvenile stage. Most Ambleminae, most diverse North American clade, infect host gills by attracting feeding fish. Many species Pleurobemini some Lampsilini release conglutinates eggs that resemble food items. few...
Freshwater mussels (superfamily Unionoidea) are in serious global decline and urgent need of protection conservation. The declines have been attributed to a wide array human activities resulting pollution water-quality degradation, habitat destruction alteration. Linkages among poor water quality, pollutant sources, mussel rivers streams associated with results laboratory-based tests specific pollutants. However, uncertainties remain about the relationship laboratory data actual contaminant...
Chemical contaminants are among many potential factors involved in the decline of freshwater mussel populations North America, and effects pesticides on early life stages unionid mussels largely unknown. The objective this study was to determine toxicity technical-grade current-use glochidia juvenile mussels. We performed acute tests with (five species) juveniles (two exposed a suite including herbicides (atrazine pendimethalin), insecticides (fipronil permethrin), reference toxicant (NaCl)....
Freshwater mussels (order Unioniformes) fulfill an essential role in benthic aquatic communities, but also are among the most sensitive and rapidly declining faunal groups North America. Rising water temperatures, caused by global climate change, industrial discharges, drought, or land development, could further challenge imperiled unionid communities. The aim of our study was to determine upper thermal tolerances larval (glochidia) juvenile life stages freshwater mussels. Glochidia 8...
Abstract Freshwater mussels, one of the most imperiled groups animals in world, are generally underrepresented toxicity databases used for development ambient water quality criteria and other environmental guidance values. Acute 96‐h tests were conducted to evaluate sensitivity 5 species juvenile mussels from 2 families 4 tribes 10 chemicals (ammonia, metals, major ions, organic compounds) screen additional (mainly with a commonly tested mussel species, fatmucket ( Lampsilis siliquoidea )....
ABSTRACT The respiration of dormant land snails (Otala lactea Müller) is characterized by periodic retention and release CO2. Rates oxygen uptake CO2 individuals were recorded continuously for up to 21 days. was usually low (5·6μlg−1tissueh−1) but increased five-fold at intervals between 20 50h. Snails hypoventilated retained when low, while periods elevated commenced with hyperventilation net release. ratio varied about 0·2 4·8 during these cycles. Calculated whole body content fluctuated...
Protection of critically endangered species requires identification factors limiting their survival and growth. Previous studies have demonstrated that unionid mussels are sensitive to some chemicals, the sensitivity was similar among different taxonomic families tribes mussels. However, common were generally used in these previous studies; little is known about threatened relative species. The objective this study evaluate a mussel (Tennessee bean, Venustaconcha trabalis) seven chemicals...
We tested whether host fish that acquired resistance to glochidia of one mussel species were cross-resistant other species. Largemouth bass (Micropterus salmoides) primed with 4–5 successive infections Lampsilis reeveiana. The percentage attached survived and transformed the juvenile stage (transformation success) was compared between naïve controls. Transformation success L. reeveiana, abrupta, Villosa iris, Utterbackia imbecillis significantly lower on (37.8%, 43.5%, 67.0%, 13.2%,...
The sedentary terrestrial larvae of the tiger beetle, Cicindela togata, inhabit areas that are often flooded for days or weeks. We tested ability these to survive immersion and anoxia. Maximum survival time immersed, anoxic C. togata was 6 at 25 Time 50% mortality (LT50) in conditions 85.9 ± 23.5 h. Survival times were more than eight longer those similarly treated Tenebrio molitor (LT50 10.1 3.2 h). Similar somewhat observed exposed an nitrogen atmosphere 102 31 h) T. (LT5014.4 6.5 At 10 C,...
The respiration physiology of active and dormant land snails was examined in relation to the reduced rates metabolism water loss that occur during dormancy. In snails, partial pressures O₂ (PO₂) CO₂ (PCO₂) lung differed by less than 16 torr from air. Arterial PCO₂ similar gas, but arterial PO₂ as much 60 lower lung, indicating strong diffusion limitation uptake across epithelium. With increase temperature, increased decreased hemolymph pH declined. During dormancy, mean 100 50 higher...
ABSTRACT The pulmonate land snail Otala lactea undergoes simultaneous hypercapnia, hypoxia, extracellular acidosis and metabolic depression during dormancy. We tested the effects of ambient hypercapnia hypoxia on oxygen consumption intracellular pH active (i.e. non-dormant) individuals. Active snails reduced by 50% within 1h when exposed to 65 mmHg (1 = 133·3 Pa) 63% in 98 mmHg. These levels CO2 are range that occurs naturally lung blood hypercapnic remained below controls for duration...
Abstract A draft update of the U.S. Environmental Protection Agency ambient water quality criteria (AWQC) for ammonia substantially lowers AWQC, primarily due to inclusion toxicity data freshwater mussels. However, most mussel used in updated AWQC were generated from water‐only exposures and limited information is available on potential influence presence a substrate response mussels laboratory tests. Our recent study demonstrated that acute sensitivity was not influenced by 4‐d The...
Oxygen available to amphibian embryos fluctuates widely and is often very low. We investigated the effects of oxygen partial pressure (1.3–16.9 kPa) on embryonic development hatching two salamander (Ambystoma) frog (Rana) species. In Ambystoma, chronic hypoxia resulted in slowed development, delayed hatching, that were less developed at time hatching. Although was not lethal embryos, temporary developmental abnormalities observed Ambystoma pressures 3.8 kPa below. Posthatching survival...
Low temperature is known to suppress immune function in ectothermic vertebrates, including fish. Therefore, we hypothesized that low might facilitate successful encystment and transformation of the parasitic glochidia larvae unionid mussels on fish hosts. Glochidia flat floater, Anodonta suborbiculata, are present hosts from January through March, when water low. The % success attached laboratory infections (golden shiner, Notemigonus crysoleucas) was significantly higher at 10°C (67%) 15°C...
The amphipod Gammarus pseudolimnaeus is an important prey species for trout in certain tailwater fisheries below hydropower dams. effects of low dissolved oxygen (DO) on this were investigated laboratory experiments. duration survival anoxia and lethally DO concentrations differed among adult female, male, juvenile individuals. Adult females the group most sensitive to both hypoxia; example, LC<sub>50</sub> hypoxia was 2.00, 1.28, 1.05 mg/L, respectively, females, males juveniles (48 h,...
ABSTRACT Fidicina mannifera Fab. (mass 3 g) can fly at a body temperature of 22 °C, but take-off is usually preceded by an endothermic warm-up that elevates Tth to 28 °C or higher. Warm-up accompanied slow, almost imperceptible, wing movements, gentle abdominal pumping and increase in V·O2 about 16 times the resting level. During wing-flapping fixed flight, increases explosively 70 level, thoracic rises 33 °C. Wing-beat frequency with Tth. Between 25 34 mean wing-beat 37 Hz. F. does not...
Freshwater mussels are among the most sensitive aquatic organisms to many contaminants and have complex life-cycles that include several distinct life stages with unique contaminant exposure pathways. Standard acute (24-96 h) chronic (28 d) toxicity tests free larva (glochidia) juvenile effective at generating data on effects two discrete but do not incorporate brooded glochidia. We developed a novel partial life-cycle assay incorporates exposures brooding adult female used this method in...