Rasgos oceanográficos en el Golfo Dulce, Pacífico de Costa Rica: una revisión para la toma de decisiones en conservación marina

Moráles-Ramírez, Álvaro; Acuña-González, Jenaro; Lizano, Omar G.; Alfaro, Eric J.; Gómez, Eddy

doi:10.15517/rbt.v63i1.23100

Cited by 15 publications

(21 citation statements)

References 36 publications

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“…In addition to the protective bathymetry, the inner basin is sheltered by the geographic shape of Golfo Dulce, which hooks strongly to the left, further limiting the effects of oceanic currents and hydrographic exchange (Svendsen et al, 2006). As a tropical region, the climate is bimodal, with seasonality based on monthly precipitation: dry (<300‐mm rainfall, December–April) and rainy (>500‐mm rainfall, May–November; Morales‐Ramírez et al, 2015). Air temperatures are generally warm, averaging 21–33.5°C (Lobo et al, 2008).…”

Section: Methodsmentioning

confidence: 99%

Safe from sunburn: The divergent diel pattern of a Hydrophis sea snake

Bessesen

González‐Suárez

2022

Ecology and Evolution

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Diel activity patterns are an important aspect of wildlife ecology and evolution and provide valuable information for conservation and monitoring, yet for many species, activity patterns remain unstudied and may be presumed to mirror related taxa. Here, we describe the distinct diel patterns of an endemic population of venomous sea snakes Hydrophis platurus xanthos inhabiting a narrow range (circa 320 km2) in Golfo Dulce, Costa Rica. To investigate, we conducted a systematic visual survey over five 24‐h cycles and evaluated 339 h of previously obtained sighting data from different studies spanning a decade. While sporadic diurnal surfacing does occur, mostly for respiration, our observations revealed marked crepuscular peaks with regular surfacing through the night. We also report on observed surface behaviors that were also found to vary in frequency at different phases of the photoperiodic cycle. In particular, we show feeding as more common at night. Hydrophis platurus xanthos has developed a circadian rhythm that differs noticeably from its taxonomic parent (H. p. platurus is reported as diurnal across its Indo‐Pacific range), and no congeners have been categorized as crepuscular. Our work thus contributes to the ecological knowledge of this evolutionarily distinct marine elapid and offers insights into the potential role of environmental conditions in shaping animal activity.

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Section: Methodsmentioning

confidence: 99%

Safe from sunburn: The divergent diel pattern of a Hydrophis sea snake

Bessesen

González‐Suárez

2022

Ecology and Evolution

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“…Their abundance appears high when compared to offshore waters. Another survey (Morales-Ramírez et al, 2015) reported dominance (44 to 84 %) of copepods such as Oncaea mediterranea, Oithona plumifera, Acrocalanus gibber, Paracalanus parvus, P. aculeatus and Centropages furcatus. The gelatinous zooplankton was also studied and 41 species were identified of which 33 were cnidarians, six were thalaceans and two were ctenophores (Morales-Ramírez & Nowaczyk, 2006).…”

Section: The R/v Victor Hensen Faunal Survey and Other Studiesmentioning

confidence: 98%

“…A comprehensive study of water parameters along Golfo Dulce was conducted between 2005 and 2007 by Morales-Ramírez et al (2015) and included an evaluation of rainfall, currents, and nutrient concentrations. Rainfall ranged from 100 to near 700 mm/month.…”

Section: Temperature Oxygen and Salinity Profilesmentioning

confidence: 99%

A fjord-like tropical ecosystem, Pacific coast of Costa Rica: overview of research in Golfo Dulce

Vargas-Zamora¹,

Gómez-Ramírez

Moráles-Ramírez

2021

Rev. Biol. Trop.

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Introduction: Coastal ecosystems worldwide are under the influence of local, regional and global stressors, such as pollution, eutrophication and climate change. Golfo Dulce is a relatively pristine and accessible deep tropical ecosystem that provides opportunities for comparative and collaborative research. Objective: To summarize published reports on past research conducted in this ecosystem, identify topics for further study, and suggest new research issues. Methods: A search was made on the web for reports based on research conducted in Golfo Dulce and published in scientific journals. Reports focusing on environmental parameters and on the biota were included. Results: A total of 123 studies that include data from Golfo Dulce are cited. The four topics more frequently addressed were reports based on the results of the R/V Victor Hensen expedition (1993-1994) and follow-up work on microbiology, studies on water parameters, research on vertebrates, and zooplankton studies. The reports focusing on vertical profiles of oxygen and temperature are discussed in detail, followed by those on the biota. Conclusions: Golfo Dulce has low oxygen concentrations below 50 m and is frequently anoxic at the 200 m deep basin with occasional formation of H2S. However, the ecosystem contains a relatively high diversity of identified organisms, from bacteria to whales. Of particular relevance for future studies are multidisciplinary surveys aiming at obtaining data on primary productivity, the diversity and biomass of the main groups of planktonic, demersal and benthic organisms, and the frequency and magnitude of the influx of deep offshore waters over the sill into the basin. These data, as well as the information gathered in the past, are essential for updating the trophic model developed more than 25 years ago and in support of new predictive models on the functioning of the ecosystem.

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“…than does Golfo Dulce (1028 spp. : Morales-Ramírez 2011 ) or Isla del Coco (1688 spp. : Cortés 2012 ), but about the same as what is currently known for Bahía Culebra (577 spp: Cortés et al 2012 ).…”

Section: Discussionmentioning

confidence: 99%

Marine biodiversity baseline for Área de Conservación Guanacaste, Costa Rica: published records

Cortés

2017

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The diversity of tropical marine organisms has not been studied as intensively as the terrestrial biota worldwide. Additionally, marine biodiversity research in the tropics lags behind other regions. The 43,000 ha Sector Marino of Área de Conservación Guanacaste ( ACG , Marine Sector of Guanacaste Conservation Area), on the North Pacific coast of Costa Rica is no exception. For more than four decades, the terrestrial flora and fauna has been studied continuously. The ACG marine biodiversity was studied in the 1930’s by expeditions that passed through the area, but not much until the 1990’s, except for the marine turtles. In the mid 1990’s the Center for Research in Marine Science and Limnology ( CIMAR ) of the Universidad de Costa Rica ( UCR ) initiated the exploration of the marine environments and organisms of ACG . In 2015, ACG , in collaboration with CIMAR , started the BioMar project whose goal is to inventory the species of the marine sector of ACG (BioMar ACG project). As a baseline, here I have compiled the published records of marine ACG species, and found that 594 marine species have been reported, representing 15.5% of the known species of the Pacific coast of Costa Rica. The most diverse groups were the crustaceans, mollusks and cnidarians comprising 71.7% of the ACG species. Some taxa, such as mangroves and fish parasites are well represented in ACG when compared to the rest of the Costa Rican coast but others appear to be greatly underrepresented, for example, red algae, polychaetes, copepods, equinoderms, and marine fishes and birds, which could be due to sampling bias. Thirty species have been originally described with specimens from ACG , and 89 species are not known from other localities on the Pacific coast of Costa Rica except ACG . Most of the sampling has been concentrated in a few localities in Sector Marino, Playa Blanca and Islas Murciélago, and in the nearby waters of Bahía Santa Elena. In an effort to fill this gap, CIMAR is collaborating with ACG and a private foundation to start an inventory of the marine organisms of the conservation area. The project will be assisted by two marine parataxonomists, and all samples will be catalogued, photographed, bar coded and voucher specimens deposited at the Museo de Zoología, UCR . All the information will be available through Internet. It is anticipated that the BioMar project will fill many of the knowledge gaps and significantly more marine species will be encountered. This project could become a viable model for marine biodiversity inventories in other Costa Rican Conservation Areas (Áreas de Conservación) and in other countries.

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Rasgos oceanográficos en el Golfo Dulce, Pacífico de Costa Rica: una revisión para la toma de decisiones en conservación marina

Cited by 15 publications

References 36 publications

Safe from sunburn: The divergent diel pattern of a Hydrophis sea snake

Safe from sunburn: The divergent diel pattern of a Hydrophis sea snake

A fjord-like tropical ecosystem, Pacific coast of Costa Rica: overview of research in Golfo Dulce

Marine biodiversity baseline for Área de Conservación Guanacaste, Costa Rica: published records

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