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Revista Ciencias Marinas y Costeras
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  This is an Open Access Journal Open Access journal
ISSN (Print) 1659-455X - ISSN (Online) 1659-407X
Published by Universidad Nacional Costa Rica Homepage  [24 journals]
  • New size record, morphometric and meristic data and length-weight
           relationship for the species Haemulon sexfasciatum Gill 1862 (Haemulidae:
           Perciformes)

    • Authors: Arturo Angulo, Federico Hampl
      Pages: 9 - 21
      Abstract: Haemulon sexfasciatum is an ecologically and commercially important fish species, widely distributed in the Tropical Eastern Pacific. In this paper report a new size record for this species is reported, based on a single specimen captured in Bahía Culebra, on the Northern Pacific coast of Costa Rica, in September 2020, as well morphometric and meristic data obtained from museum specimens, complementing previous descriptions. We also provide length-weight data generated from fresh and preserved specimens as a basis for calculating/estimating biomass and condition, with direct implications for the establishment of management measures, as well as conservation activities at both local and regional scales. Haemulon sexfasciatum has isometric growth, determined by the following equation: Weight = 0.0227 * Standard Length3.0400 (r2 = 0.99), with a maximum standard length of around 60 cm and a maximum total length of about 71 cm.
      PubDate: 2021-07-27
      DOI: 10.15359/revmar.13-2.1
       
  • Predation of Gecarcinus quadratus (Decapoda: Gecarcinidae) by Aramides
           cajaneus (Gruiformes: Rallidae) in Costa Rica

    • Authors: Sergio Villegas-Retana, Jorge Picado-Masís
      Pages: 23 - 26
      Abstract: Gecarcinus quadratus is a land crab preyed upon by some species, but there is little information about the genera and species of these predators. This scientific note presents the first record of Aramides cajaneus preying upon G. quadratus. This observation occurred during daylight in May 2021 in Costa Rica, and contributes to the knowledge about the natural history, behavior and ecology of these species.
      PubDate: 2021-07-27
      DOI: 10.15359/revmar.13-2.2
       
  • Sightings of Orcinus orca (Linnaeus, 1758) (Cetartiodactyla: Odontoceti:
           Delphinidae) in the Costa Rican Pacific (1990-2020)

    • Authors: César Castro-Azofeifa
      Pages: 29 - 47
      Abstract: Orcas are little studied cetaceans in the tropics, and their movements through Costa Rican waters have been scarcely addressed. They are animals of great ecological importance due to their role as top predators and documenting their presence in the country can be of great scientific and social importance, for coastal communities this information could represent a great opportunity from an ecotourism perspective. The objective of this research was to synthesize and systematize the existing reports regarding orcas in the country, using scientific publications, books and information derived from citizen reports. The information collected up to December 31, 2020, was considered. The sightings and the number of killer whales in the Costa Rican Pacific were divided regionally: 17 sightings and 56 individuals for the South Pacific, 7 sightings and 20 individuals for the North Pacific. 3 sightings and 19 individuals in the Central Pacific and 4 sightings and 10 individuals for Isla del Coco. There were 31 sightings and 105 individuals in total. No statistically significant differences were found in the occurrence of killer whales between the zones, although there is a greater number of reports in the South Pacific, especially in September. Studying the presence of orcas in the country, involving processes of environmental education and citizen science, can provide important tools for the formulation of public policies that allow an effective conservation of cetaceans and offer greater opportunities for growth for the ecotourism industry in the coasts.
      PubDate: 2021-07-27
      DOI: 10.15359/revmar.13-2.3
       
  • At the rhythm of the tide: acoustic landscape characterization of the
           coastal areas of Punta Morales, Puntarenas, Costa Rica

    • Authors: Ian Portuguez-Brenes, Roberto Vargas-Masís, Héctor Perdomo-Velázquez, Andrea García-Rojas
      Pages: 49 - 68
      Abstract: In coastal ecosystems, geophonies are a fundamental part of the acoustic landscape, and the impact of waves on their geomorphology is an example of it. An Audiomoth recorder was placed in four coastal sites of Punta Morales, Puntarenas, Costa Rica, from November 22 to December 18, 2020, and the devices were programmed to record 60 seconds every 10 minutes for 24 hours with the objective of characterizing the acoustic landscape associated to the tidal cycles of this locality. From the recordings, for the Normalized Difference Soundscape Index (NDSI), the Technophones, the Acoustic Entropy (TE), and the Sound Pressure Level (SPL) were analyzed. Comparisons of one-way trimmed means of all indices were made between the four study areas, and a correlation was made between the tide level and the SPL value at each sampling site; finally, these values were compared at high and low tide at each location. Differences were found for all indices between sites, a positive correlation was identified between the SPL of two of the study areas with the tide level, and differences in the SPL were observed between high tide and low tide. The substrate and vegetation of the surveyed region could have influenced these differences. In addition, waves significantly modify the acoustic dynamics of some places, so this factor could have affected the soundscape in this coastal zone.
      PubDate: 2021-07-27
      DOI: 10.15359/revmar.13-2.4
       
 
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