Seabird temporal composition, abundance and habitat use in “Punta La Metalera” (Arequipa), Southern PeruAcrónimo: MCNB-Vilca-Taco et al-2021
Islands, islets, and guano headlands provide a unique variety of habitats for seabirds. Their variability determines the structure and dynamics of the community. Studies about the temporal diversity and habitat use of these systems in southern Peru are lacking. The aim of this study was to analyze the abundance, composition, and behavior of seabirds at La Punta La Metalera (El Faro) in the province of Islay in the Arequipa region of southern Peru. We recorded a total of 12 species. One of these is endemic to the Peruvian coast (Cinclodes taczanowskii), one is considered in endangered (Spheniscus humboldti), and four have been assigned near threatened status (Phalacrocorax gaimardi, Pelecanus thagus, Sula variegata and Larosterna inca). Some of these birds belong to the guano bird group. Laridae was the most abundant family due to Larosterna inca, which showed the highest number of individuals. Temporal variation showed that species were most abundant in December and January. The habitat was mainly used for resting, preening, and feeding. However, nesting was also recorded for six species. Based on the little information previously available for this region our findings indicate that La Punta La Metalera is an important area for the development and reproduction of some of the species recorded.
The study was conducted in Punta La Metalera in the Islay district of the city of Arequipa, 10 km northeast of Mollendo (-72.111527 °S, -17.015428 °W). Punta La Metalera is a cape that has varied landforms: cliffs, shoreline, rocky outcrops with steep slopes and guano-covered surface, and algae vegetation. Its surrounding areas are islets.
Calidad de los datos
Regarding the use of the territory and behavior, we considered eight categories according to the type of activity developed by the birds during the evaluations). Additionally, we recorded the interference of anthropic activity considering boats, tourism, guano collection and any other related activity that could be considered to disturb the birds in the evaluation area.
We analyzed the temporal fluctuation by comparing months and comparing the mean values for each month of the abundance variation using ANOVA (one way, p < 0.05.). Data normality was previously evaluated using the Shapiro test (Peña-Villalobos et al., 2012) and normalized using the bestNormalize (Peterson, 2020) package in RStudio (RStudio Team, 2020).
The species occurrence frequency (SOF) was analyzed considering six categories (Nores, 1996 cited by Brandolin et al, 2007), which are: i) very common (0.8–1), ii) common (0.6–0.8), iii) frequent (0.4–0.6), iv)scarce (0.2–0.4), v) occasional (0.1–0.2), and vi) accidental (< 0.1). These values were obtained for each species as the number of months in which the species was present, divided by the total number of sampled months. For the species relative abundance (SRA), we considered five categories: i) abundant (90–100 %), ii) common (65–89 %), iii) moderately common (31–64 %), iv)uncommon (10–30 %), and v) rare (1–9 %). These percentages were obtained for each species as the number of individuals of a species divided by the total number of individuals considering all species and multiplied by 100 (Güitrón–López et al., 2018).
The dissimilarity of species abundance between months was calculated using the index of similarity (Bray-Curtis), 1 - (2c/S1 + S2), where S1 and S2 are the number of species in sample months 1 and 2, respectively, and c is the number of species present in both sample months. This dissimilarity was represented with dendrograms using the UPGMA method with PAST v.2.17 (Kusch et al. 2008 cited by Peña-Villalobos et al., 2012) to establish a similarity relationship between assessment months on species/abundance fluctuations. And finally, habitat use (land-use) was analyzed comparing the birds' behavior s per month, for which we summed up each behavior record.
Tipo de contenido
Includes: point occurrence data.
Vilca Taco, L.M., Mamani T., E., Luque Fernández, C. R., 2021. Seabird temporal composition, abundance and habitat use in “Punta La Metalera” (Arequipa), Southern Peru. Museu de Ciències Naturals de Barcelona. Dataset/Occurrence. https://doi.org/10.15470/9umyvz
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