Examinando por Autor "Hooker, Y."

Mostrando 1 - 2 de 2
  • Miniatura
    ÍtemAcceso Abierto
    A review on the diversity and distribution of opisthobranch gastropods from Peru, with the addition of three new records: (Gastropoda, Heterobranchia)
    (2013) Uribe, R.A.; Nakamura, K.; Indacochea, A.; Pacheco, A.S.; Hooker, Y.; Schrödl, M.
    Although the diversity of marine molluscs along the Humboldt Current ecosystem is relatively well known, some groups such as opisthobranch sea slugs and snails (Gastropoda, Heterobranchia) have received little attention. Herein, we critically review and update the taxonomical composition of Acteonoidea, Nudi pleura, Euopisthobranchia and marine panpulmonates Sacoglossa and Acochlida from coastal Peruvian waters. Our checklist comprises a total of 56 species belonging to 30 families. The nudibranch species Tritonia sp., Tyrinna nobilis and Diaulula variolata are reported for the first time in the Peruvian coast. We also add new collection localities for 19 species, including Bulla punctulata, Navanax aenigmaticus, Haminoea peruviana, Aplysia juliana, Dolabrifera dolabrifera, Elysia diomedea, Elysia hedgpethi, Doris fontainei, Baptodoris peruviana, Polycera alabe, Felimare agassizii, Doto uva, Dendronotus cf. venustus, Flabellina cynara, Fiona pinnata, Spurilla cf. neapolitana, Phidiana lottini, Bajaeolis bertschi and Glaucus atlanticus. The species Bulla punctulata, H. peruviana, F. cynara and A. juliana, which are usually distributed in the Tropical East Pacific, are now reported also from the Warm Temperate Southeastern Pacific Province. Earlier records of thecosome pteropods and several more or less adequately described Aplysia species still need taxonomic revision. Several benthic Peruvian opisthobranch species assumed to show wide or even circumtropical distributions are likely to be part of species complexes. Integrative approaches including molecular species characterization and intensified field work are necessary to enhance the knowledge on the diversity of opisthobranchs from Peru.
  • Miniatura
    ÍtemAcceso Abierto
    Feeding ecology of the green turtle Chelonia mydas in northern Peru
    (Escuela de Ciencias del Mar, 2017) Jiménez, A.; Pingo, S.; Alfaro-Shigueto, J.; Mangel, J.C.; Hooker, Y.
    Diet and food preferences of the green turtle Chelonia mydas were analyzed based on digestive tract contents of dead specimens caught incidentally by an artisanal gillnet fishery in Sechura Bay, northern Peru. We examined 27 digestive tracts and identified 35 prey items. The sampled turtles were all juveniles (CCL = 53.7 ± 1.2 cm, range 40.5-67.0 cm). The prey items were grouped into six categories: algae, cnidarians, mollusks, arthropods, chordates and garbage/anthropogenic debris. The items with the highest Frequency of Occurrence values (% FO) were: Caulerpa filiformis (77.8%), Loligo gahi (eggs) (51.9%) and Rhodymenia corallina (44.4%). By weight (% W), the most important items, were L. gahi (eggs) (33.3%), Stomolophus sp. (7.3%) and Aphos porosus (6.5%). According to the Preponderance Index (%IP), the preponderant item was L. gahi (eggs) with 6.1% and 61.2% during winter-spring and summer-autumn, respectively. According to the Resultant Weight index (Rw) of wet items, the most important items were: C. filiformis (13.1%), L. gahi (eggs) (10.5%), R. corallina (7.4%), plastic (7.5%), Gigartina chamissoi (5.1%). Garbage/anthropogenic debris was common in the digestive tracts analyzed. Plastic items had a frequency of occurrence of 44.4%. A greater diversity of food items was observed during summer and autumn. This study shows that juvenile C. mydas forage on a variety of resources. We recommend that conservation plans, land use planning and future management plans in the Sechura Bay include green turtles as a sentinel species for monitoring biodiversity of marine resources and the degree of pollution in the Bay. © 2017, Escuela de Ciencias del Mar. All rights reserved.