Julia Patricia Díaz-Martínez

• Doctor of Philosophy
• Research Associate at Universidad del Mar

Widely distributed species such as Arbacia stellata adjust patterns of their life history according to local conditions. In the present study the reproductive cycle of this species was analysed throughout a sampling year. Gonadal development cycle, sex ratio, actual fecundity and oocyte size distribution were characterized and the relationship of t...

Toxopneustes roseus performs a key role in the eastern tropical Pacific as a strategic herbivore and bioturbation promoter. We evaluated the effect of temperature on the fertilization success, embryonic development and larval survival of T. roseus under laboratory conditions, to understand how the increase in ocean temperature could affect it in a...

Diadema mexicanum is a common inhabitant of the Mexican Pacific coast and a key species for coral reefs dynamics. Several reproductive traits of D. mexicanum throughout one year at La Entrega Bay, Oaxaca (15°44′N), in the Mexican tropical Pacific, were analyzed. Maturity index or microscopic maturity index “MI” was calculated. Annual ratio of males...

Diadema mexicanum, a conspicuous inhabitant along the Mexican Pacific coast, is a key species for the dynamics of coral reefs; nevertheless, studies on population dynamics for this species are scarce. Monthly sampling was carried out between April 2008 and March 2009 at Isla Montosa and La Entrega, Oaxaca, Mexico using belt transects. Population de...

Reproductive patterns of Arbacia stellata (Blainville, 1825; ?Gmelin, 1788) in Punta Banda, Baja California, Mexico Julia Patricia Díaz-Martínez1, Eugenio de Jesús Carpizo-Ituarte2 and Francisco Benítez-Villalobos3. 1División de Estudios de Posgrado, Universidad del Mar (UMAR), Campus Puerto Ángel, Distrito de San Pedro Pochutla, Puerto Ángel, Oaxa...

We investigated the current patterns of diversity by country and by class of echinoderms, and analyzed their biogeographical, depth, and habitat or substratum affinities, using the database of the appendix of this book. Traditionally, the area has been divided into five biogeographical Regions and nine Provinces that cover a wide climate range. Cur...

Mexico is one of the most biodiverse countries on the planet. Knowledge of echinoderm diversity in Mexico started in the XIX Century with Louis Agassiz in 1841. Currently, 643 species of echinoderms are known from Mexico, with Class Ophiuroidea the richest (197 species); Class Asteroidea follows with 185 species, then Class Echinoidea with 119 spec...

I n t r o d u c c i ó n as estrellas de mar (clase Asteroidea) son sin duda los miembros más conocidos de los equi-nodermos, y de los invertebrados marinos en general. Son conocidas también como "el em-blema de los mares". El cuerpo de estos animales, como su nombre lo dice, tiene forma de estrella: cuentan con un disco corporal central del que se...

We analysed the reproductive biology of the asteroid species Styracaster elongatus based on time-series samples from a 5000-m-deep site on the Porcupine Abyssal Plain (N.E. Atlantic). The ratio of males to females, the gonadosomatic index (GI), and pyloric caecum index (PCI) were determined and the results were corroborated by histological examinat...

The reproductive features of two North-Atlantic starfish species, Henricia abyssicola and Styracaster elongatus was determined in time series samples. Specimens of H. abyssicola were collected between 1250 and 1900m in the Porcupine Seabight, and specimens of S. elongatus were collected around 5000m in the Porcupine Abyssal Plain. The ratio of male...

The sea urchin species Diadema mexicanum is a common inhabitant of the Bahias de Huatulco, an important reef area on the Pacific coast of Mexico (Reyes-Bonilla 2003). Until May 2009 the density of the sea urchins remained relatively constant through time since monitoring began in the 1990s, the highest being found at La Entrega (4–7 ind. m–2) (Beni...

The reproductive biology of the North Atlantic asteroid Henricia abyssicola is determined in time series samples taken from 1250 to 1900 m depth in the Porcupine Seabight (NE Atlantic). The male-female ratio, gonadosomatic index (GI), pyloric caecum index (PCI), fecundity and oocyte size distribution were determined and the results were corroborate...