Collin Lab

Directory of Calyptraeid Researchers

Dr. Oscar Chaparro

My research interest is focused on the reproductive biology and energetic physiology of estuarine invertebrates. Of particular interest is the brooding process as well as the reproduction mode and we use Crepipatella as one of our research models. During several years we have made anatomical, physiological, morpho-functional and energetic studies on brooded embryos, in pelagic larvae and in adult specimens. Most recently, we have studied the mother and embryo responses to reduced salinity levels due to effects of the tidal cycles in estuaries. Low-salinity exposure forces the mother to go into isolation from the environment and our research tries to characterize the changes that happen in the brooding chamber fluid as a consequence, and its impact on the brooded embryos.
We are beginning studies in collaboration with the Dr. J. Pechenik, relating the events of embryonic stress due to the mother’s isolation, with latent effects that are expressed during the juvenile stage.

Email: ochaparr@uach.cl
Phone: 56 63 221791
Address : Instituto de Biología Marina, Universidad Austral de Chile, casilla 567, Valdivia, CHILE

Publications on Calyptraeids from the last 10 years

Chaparro OR, Oyarzún RF, Vergara AM & RJ Thompson (1999). Energy investment in nurse eggs and egg capsules in Crepidula dilatata (Gastropoda, Calyptreaidae) and its influence on the hatching size of the juveniles. Journal of Experimental Marine Biology and Ecology 232: 261-274.

Chaparro OR, Pereda SV & I Bahamondes-Rojas (2001). Effects of protandric sex change on radula, pedal morphology, and motility in Crepidula fecunda (Gastropoda: Calyptraeidae). New Zealand Journal of Marine and Freshwater Research 35: 881-890.

Chaparro OR, Saldivia CL & KA Paschke (2001). Regulatory aspects of the brood capacity of Crepidula fecunda, Gallardo 1979 (Gastropoda: Calyptraeaidae). Journal of Experimental Marine Biology and Ecology 266: 97-108.

Chaparro OR, Thompson RJ & SV Pereda (2002). Feeding mechanisms in the gastropod Crepidula fecunda. Marine Ecology Progress Series 234: 171-181

Navarro JM & OR Chaparro (2002). Grazing-filtration as feeding mechanisms in motile specimens of Crepidula fecunda (Gastropoda: Calyptraidae). Journal of Experimental Marine Biology and Ecology 270: 111-122.

Chaparro OR, Soto AE & CE Bertran (2002). Velar caracteristics and feeding capacity of encapsulated and pelagic larvae of Crepidula fecunda Gallardo 1979 (Gastropoda; Calyptraeidae). Journal of Shellfish Research 21:233-237.

Chaparro OR, Charpentier JL & R Collin (2002). Embryonic velar structure and function of two sibling species of Crepidula with different modes of development. Biological Bulletin 203: 80-86.

Chaparro OR & ML Flores (2002). Reproductive output of Crepidula fecunda females: Distribution of energy in the production of gametes and capsules walls. New Zealand Journal of Marine and Freshwater Research 36: 661-673.

Chaparro OR, Segura CJ, Navarro JM & RJ Thompson (2004). The effect of food supply on feeding strategy in sessile female gastropds Crepidula fecunda. Marine Biology 144: 79-87.

Ojeda J & OR Chaparro (2004). Morphological, gravimetric and biochemical changes of the capsular wall in Crepidula fecunda during the brooding process. Marine Biology 144: 263-269.

Chaparro OR, Montiel YA & VM Cubillos 2005 Direct intracapsular development: implications for feeding mechanisms in early juveniles of gastropod Crepidula dilatata. Journal of the Marine Biological Association of the United Kingdom 85:163-169

Chaparro OR, Saldivia CL, Pereda SV, Segura CJ, Montiel YA & R Collin (2005). The reproductive cycle and development of Crepipatella fecunda (Gastropoda: Calyptraeidae) from southern Chile. Journal of Marine Biology Association of the United Kingdom 85: 157-161

Montiel YA, Chaparro OR & CJ Segura (2005). Changes in feeding mechanisms during early ontogeny in juveniles of Crepidula fecunda (Gastropoda, Calyptraeidae). Marine Biology 147: 1333-1342.

Schmidt AJ, Toro JE & OR Chaparro (2006). Reproductive patterns and their infleunce on the population genetics of sympatric species of the genus Crepidula (Gastropoda, Calyptraeidae). Journal of Shellfish Research 25 (2): 371-378

Cubillos VM, Chaparro OR, Montiel YA & D Véliz (2007). Unusual source of food: impact of dead siblings on encapsulated embryo development of Crepipatella fecunda (Gastropoda: Calyptraeidae). Marine and Freshwater Research, 2007, 58, 1152-1161.

Collin R, Chaparro OR, Winkler F & D. Veliz (2007). Molecular Phylogenetic and embryological evidence that feeding larvae have been reacquired in a marine gastropod. Biological Bulletin, 212: 83-92.

Chaparro OR, Montiel YA, Segura CJ, Cubillos VM, Thompson RJ & JM Navarro (2008). The effect of salinity on clearance rate in the suspension-feeding estuarine gastropod Crepipatella dilatata under natural and controlled conditions. Estuarine, Coastal and Shelf Science 76: 861-868.

Chaparro, O.R., C.J. Segura, J.A. Montory, J.M. Navarro & J.A. Pechenik. (2009). Brood chamber isolation during salinity stress in two estuarine mollusk species: from a protective nursery to a dangerous prision. Marine Ecology Progress Series. 374: 145-155.

Montory J.A., O.R. Chaparro, V.M. Cubillos & J.A. Pechenik. (2009). Isolation of incubation chambers during brooding: effect of reduced pH on protoconch development in the estuarine gastropod Crepipatella dilatata. Marine Ecology Progress Series. 374: 157-166.

Segura C.J., O.R. Chaparro, K.A. Paschke, J.A. Pechenik. (2010). Capsule walls as barriers to oxygen availability: Implications for the development of brooded embryos by the estuarine gastropod Crepipatella dilatata (Calyptraeidae) Journal of Experimental Marine Biology and Ecology 390: 49–57.

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