Mark J Garcia

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To maximize reproductive success, many animal species have evolved functional sex change. Theory predicts that transitions between sexes should occur when the fitness payoff of the current sex is exceeded by the fitness payoff of the opposite sex. We examined phenotypic differences between the sexes in a sex-changing vertebrate, the mangrove rivulus fish(More)
Reception of pheromone cues can elicit significant physiological (e.g. steroid hormone levels) changes in the recipient. These pheromone-induced physiological changes have been well documented for male-female interactions, but scarcely in same-sex interactions (male-male and female-female). We sought to address this dearth in the current literature and(More)
The mangrove rivulus (Kryptolebias marmoratus) is a small fish native to mangrove ecosystems in Florida, the Caribbean, Central America, and South America. This species is one of only two self-fertilizing, hermaphroditic vertebrates capable of producing offspring that are genetically identical to both the parent and all siblings. Long bouts of selfing(More)
Steroid hormones regulate many aspects of reproductive physiology and behavior, including parental care. Reptiles display a variety of egg- and neonate-directed parental behaviors, yet few studies have addressed their endocrine correlates. Viviparous female pitvipers remain at the birth site with their young for one to two weeks until neonates complete(More)
Southwestern Medical School in Dallas. Dr. Brown and his long-time colleague, Dr. Joseph L. Goldstein, together discovered the low density lipoprotein (LDL) receptor , which controls the level of cholesterol in blood and in cells. They showed in one out of every 500 people in most populations that mutations in this receptor cause Familial(More)
The College Maladjustment (Mt) Scale is a 41-item supplementary scale of the Minnesota Multiphasic Personality Inventory. It was designed to identify college students classified as maladjusted. Very little research has been conducted on the Mt Scale in the 40 years since its inception. The current study had the following four goals: (a) provide additional(More)
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