Records documenting the ingestion of plastic anthropogenic wastes in marine mammals are almost non-existent in the Eastern Pacifi c. In the present work, the ingestion of a plastic net by the South American sea lion Otaria fl avescens (Shaw, 1800) in the “San Pedro” Beach, Lurín, Lima, Peru is reported. Necropsy of the specimen showed the presence of whitish plastic fi laments (nylon) (≈ 0.5 mm in diameter) intermixed with individuals of Mugil cephalus Linnaeus, 1758. Previous documentation in research/dissemination articles on ingestion of plastic anthropic macro-waste in this species in Peru has not been reported, nor in articles of international review. With this new report, 42.85% (n = 6) of the otarid species around the world have ingested plastic macro-waste.

More than half of freshwater gastropods are in some category of conservation worldwide. Th e objective of this study was to evaluate the drastic decrease in the gastropod community of the Los Pantanos de Villa Wildlife Refuge (RVSPV), Lima, Peru from 2005 to 2010. 8,640 gastropods were collected from eight sampling stations near the “Marvilla” lagoon of the RVSPV. Th e relative abundances by species, families, and study year were obtained. Th e population density of gastropods (ind·m-²) by families was analyzed and also they were grouped between native and exotic species. Th e effect of water quality, established by physicochemical factors, on the density of gastropods according to family and year of study was evaluated. Th e alpha diversity for the gastropod community covered the indices of S (Richness), H' (Shannon- Wiener), D (Simpson), and DMn (Menhinick) per year of study. Th ...

En el presente estudio se realiza el primer registro de la presencia de Corbicula fluminea (Müller, 1774) en los sistemas acuícolas de la Cuenca de Mala, Lima, Perú y se detallan algunos caracteres de diagnóstico para su fácil determinación. Se colectaron 50 ejemplares provenientes de una acequia del Río Mala, en la cual, se midió la temperatura y el pH. Algunas variables conquiliométricas y características de la masa visceral fueron analizadas. Se obtuvieron los estadígrafos descriptivos de las variables y se hizo un gráfico de frecuencias de la longitud valvar (LV). La normalidad de las variables se comprobó mediante una prueba Q-Q plot, ratificada por la prueba de Kolmogorov-Smirnov. Posteriormente, se realizaron correlaciones de Pearson para comprobar la estabilidad morfológica. Se encontró un promedio de 1,57 cm para LV, con un valor máximo de 2,50 cm. La mayor propo...

Records documenting the ingestion of plastic anthropogenic wastes in marine mammals are almost non-existent in the Eastern Pacifi c. In the present work, the ingestion of a plastic net by the South American sea lion Otaria fl avescens (Shaw, 1800) in the “San Pedro” Beach, Lurín, Lima, Peru is reported. Necropsy of the specimen showed the presence of whitish plastic fi laments (nylon) (≈ 0.5 mm in diameter) intermixed with individuals of Mugil cephalus Linnaeus, 1758. Previous documentation in research/dissemination articles on ingestion of plastic anthropic macro-waste in this species in Peru has not been reported, nor in articles of international review. With this new report, 42.85% (n = 6) of the otarid species around the world have ingested plastic macro-waste.

More than half of freshwater gastropods are in some category of conservation worldwide. Th e objective of this study was to evaluate the drastic decrease in the gastropod community of the Los Pantanos de Villa Wildlife Refuge (RVSPV), Lima, Peru from 2005 to 2010. 8,640 gastropods were collected from eight sampling stations near the “Marvilla” lagoon of the RVSPV. Th e relative abundances by species, families, and study year were obtained. Th e population density of gastropods (ind·m-²) by families was analyzed and also they were grouped between native and exotic species. Th e effect of water quality, established by physicochemical factors, on the density of gastropods according to family and year of study was evaluated. Th e alpha diversity for the gastropod community covered the indices of S (Richness), H' (Shannon- Wiener), D (Simpson), and DMn (Menhinick) per year of study. Th ...

The objective of this research is to determine the effect of the riparian forest on the fish community of the Tumbaro, Naranjillo, and Mayo rivers in the Native Community of Shampuyacu, Awajun, Peru. Sampling was carried out at 14 points in the three rivers located in the Native Community. The collection of fish involved the use of passive and active fishing gear. The riparian forest was classified utilizing satellite images into three categories: primary forest, secondary forest, and agricultural cultivation, and finally eight physicochemical parameters were measured. A total of 1,198 fishdistributed in 12 families and 27 species were collected. The Characiformes represented 57.3% of the total, followed by the Siluriformes (32.7%) and Perciformes (10%). Chaetostoma marmorescens Eigenmann & Allen, 1942, Chaetostoma sp. (Tschudi, 1846), and Hypostomus fonchii (Weber & Montoya-Burg...

Coastal wetlands are ecosystems with a high diversity of species, and they are considered of strategic importance in the conservation of biodiversity. Th e aim of this research is to record the ichthyofauna found in the wetlands of Puerto Viejo, Peru between November and December 2019. Passive fi shing gear was used through the use of mesh traps. Relative abundance was calculated by family and species, as well as alpha diversity indices: specifi c richness (S), Menhinick index (DMn), Shannon index (H’), and Simpson index (D). A total of 201 specimens were obtained belonging to fi ve genera and seven species: Bryconamericus peruanus (Muller & Troschel, 1845); Andinoacara stalsbergi Musilová, Schindler & Staeck, 2009; Amatitlania nigrofasciata (Günther, 1867); Oreochromis niloticus (Linnaeus, 1758), Poecilia reticulata Peters, 1859; Poecilia velifera (Regan, 1914); and Poecilia...

The presence of the red swamp crayfish, Procambarus clarkii (Girard, 1852), a species native to the central and southern United States of America and northeastern Mexico, is reported in the Los Pantanos de Villa wetland, representing its first record in the continental waters of Peru. This species has a marked ecological plasticity, which gives it a strong invasive character that has made it one of the most widely distributed freshwater crabs in the world. It is omnivorous and opportunistic, being able to change its diet according to the body of water where it is established, which together with a short life cycle and great facility to increase its population, represents a potential threat to native species and natural ecosystems. Fish and birds are its main predators. In Los Pantanos de Villa it has been found in the Vista Alegre, Ganaderos and Huaylas channels, between September 22, 20...