cytonuclear discordance across a leopard frog contact zone.we conducted a genetic analysis of the extent of hybridization within and outside a contact zone between two north american leopard frogs, rana blairi and rana pipiens by comparing distribution patterns of mitochondrial and nuclear haplotypes. the contact zone, located between south dakota, nebraska, and iowa, usa, was previously examined using morphological data in the 1970s, leading to the conclusion that hybridization was rare between r. pipiens and r. blairi. our genetic analysis of 51 popul ...200717689987
indicators of the statuses of amphibian populations and their potential for exposure to atrazine in four midwestern u.s. conservation areas.extensive corn production in the midwestern united states has physically eliminated or fragmented vast areas of historical amphibian habitat. midwestern corn farmers also apply large quantities of fertilizers and herbicides, which can cause direct and indirect effects on amphibians. limited field research regarding the statuses of midwestern amphibian populations near areas of corn production has left resource managers, conservation planners, and other stakeholders needing more information to im ...201425216249
detection and ecology of leptospirosis in iowa gain additional information on the extent of leptospirosis in wildlife following a human outbreak in iowa, wild mammals and lower forms of life were collected. isolation, darkfield microscopic, serologic and pathologic procedures were used to identify past or present evidence of leptospiral infection. leptospires were isolated from 7 of 75 (9%) mammals. serotype grippotyphosa was isolated from three raccoons (procyon lotor) and one western harvest mouse (reithrodontomys megalotis). serotype b ...197016512128
pesticide concentrations in frog tissue and wetland habitats in a landscape dominated by agriculture.habitat loss and exposure to pesticides are likely primary factors contributing to amphibian decline in agricultural landscapes. conservation efforts have attempted to restore wetlands lost through landscape modifications to reduce contaminant loads in surface waters and providing quality habitat to wildlife. the benefits of this increased wetland area, perhaps especially for amphibians, may be negated if habitat quality is insufficient to support persistent populations. we examined the presence ...201525244036
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