Extreme rainstorms drive exceptional organic carbon export from forested humid-tropical rivers in Puerto Rico.

Extreme rainfall events in the humid-tropical Luquillo Mountains, Puerto Rico export the bulk of suspended sediment and particulate organic carbon. Using 25 years of river carbon and suspended sediment data, which targeted hurricanes and other large rainstorms, we estimated biogenic particulate organic carbon yields of 65 ± 16 tC km-2 yr-1 for the Icacos and 17.7 ± 5.1 tC km-2 yr-1 for the Mameyes rivers. These granitic and volcaniclastic catchments function as substantial atmospheric carbon-dioxide sinks, largely through export of river biogenic particulate organic carbon during extreme rainstorms. Compared to other regions, these high biogenic particulate organic carbon yields are accompanied by lower suspended sediment yields. Accordingly, particulate organic carbon export from these catchments is underpredicted by previous yield relationships, which are derived mainly from catchments with easily erodible sedimentary rocks. Therefore, rivers that drain petrogenic-carbon-poor bedrock require separate accounting to estimate their contributions to the geological carbon cycle.

Life events in patients with vulvodynia.

OBJECTIVE: Vulval pain, in the absence of pathology, may have a psychological basis that relates to life events. This study aimed to determine the nature of such events. DESIGN: Structured questionnaire about patient's symptoms and early-life events. SETTING: Private practice physiotherapist specialising in pelvic floor disorders. POPULATION: Patients with vulvodynia as their primary symptom and control patients being treated for urinary tract disorder or post-childbirth routine physiotherapy who had no vulval pain on direct questioning. METHODS: Questionnaire applied to consecutive patients referred for treatment. Seventy-eight consecutive women presenting with vulvodynia (mean age 34 years, mean duration of symptoms 48 months) and 78 controls (mean age 39 years). MAIN OUTCOME MEASURES: Incidence of life events. RESULTS: A similar proportion of both groups were married. Being in a new relationship (P < 0.04), adverse current or previous relationships (39 versus 9%, P < or = 0.01), parental divorce (26 versus 9%, P < or = 0.001), history of termination of pregnancy, and adverse childbirth experiences (P < 0.04) were more common in patients than in controls. A history of sexual abuse was not more common in patients with vulvodynia compared with controls (13 versus 10%, P = not significant). Lack of libido was common in patients with vulvodynia (94 versus 29%, P < 0.0001). CONCLUSIONS: Adverse life experiences, including conflict, are common in women with vulvodynia. These factors may be important in mediating the genesis of pain through stress-related mechanisms. Sexual interest is diminished in these women. Sexual abuse is not a factor in most of these women. These findings have implications for treatment.