Habitat partitioning mediates the coexistence of sympatric dolphins in a tropical fjord-like embayment

Oviedo, Lenin; Fernández, Marc; Herra-Miranda, David; Pacheco-Polanco, Juan Diego; Hernández‐Camacho, Claudia J.; Aurioles‐Gamboa, David

doi:10.1093/jmammal/gyy021

Cited by 9 publications

(10 citation statements)

References 50 publications

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“…There are reports on the population of the sea snake Pelamis platurus (Bessesen, 2012) and its colour variability (Solórzano, 2011), and on a recently described subspecies (Bessesen & Galbreath, 2017). The population and habitat use of the green turtle Chelonia Research on marine mammals has been emphasized with studies on humpback whales (Megaptera novaeangliae) by Bessesen (2015) and Herra-Miranda et al (2016), the false killer whale Pseudorca crassidens (Sánchez-Robledo et al, 2020), dolphins (mainly the bottlenose dolphin Tursiops truncatus and the spotted dolphin Stenella attenuata) and other cetaceans (Acevedo, 1995;Acevedo-Gutiérrez, 1996;Acevedo & Burkhart,1998;Cubero-Pardo, 1998;Cubero-Pardo, 2007a;Cubero-Pardo, 2007b;Oviedo, 2007;Herra-Miranda et al, 2016;Moreno & Acevedo-Gutiérrez, 2016;Oviedo et al, 2018). Based on 943 sightings over a period of nine years the study by Oviedo et al (2015) identified 12 species of cetaceans in Golfo Dulce.…”

Section: Reptiles and Cetaceansmentioning

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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Section: Reptiles and Cetaceansmentioning

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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“…Bottlenose dolphins preferred the shelf-break and oceanic waters. Habitat and niche partitioning occur as response to the resource competition (Bearzi, 2005;Oviedo et al, 2018). Indeed, dusky and common dolphins shared the environmental space related to coldproductive waters with shallow OMZ, therefore latitudinal differences would allow reduce partially the inter-specific competition.…”

Section: Discussionmentioning

confidence: 99%

The oxygen minimum zone relative depth is a key driver of dolphin habitats in the northern Humboldt Current System

Llapapasca

Pardo²,

Grados³

et al. 2022

Front. Mar. Sci.

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Highly mobile odontocetes need habitats with environmental conditions with the potential of aggregating enough and high-quality prey, to maximize foraging success. Until now, the characterization of those habitats was in terms of physical and biological indicators of high production, capable of attracting and sustaining prey. Nevertheless, there has been no approach to quantifying the effects of a biophysical characteristic of the ocean with proven effects on the vertical distribution of prey for cetaceans: The oxygen minimum zone (OMZ) depth. In the northern branch of the Humboldt Current System off Peru (~6-18° S), a shallow OMZ (30-50 m) affects the distribution of the Peruvian anchovy (Engraulis ringens), main prey for several marine predators, including dolphins. We hypothesized these predators would aggregate in productive areas, but with preference for places where the relative OMZ depth can constrain prey vertically, making it more accessible and maximizing foraging success. We fitted Bayesian habitat models for three dominant odontocete species in this region, with multiple combinations of environmental covariates, smoothing techniques, and temporal and spatial random effects. Cetacean data came from 23 dedicated surveys spanning 2001-2019. Habitat predictors included the spatial anomalies of sea surface temperature, surface chlorophyl-a, pycnocline depth and OMZ depth. Dusky (Lagenorhynchus obscurus) and common dolphins (Delphinus delphis) preferred productive, cold areas with a very shallow OMZ, regardless of the season, while bottlenose dolphins (Tursiops truncatus) aggregated in both cold and warm waters, also with shallow OMZ. The former two species of higher metabolic demands would maximize energy intake by selecting areas with highly aggregated prey, while the latter, of more moderate metabolic needs and more diverse prey, would exploit less restricted habitats.

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“…Sympatric species, or populations within a species, that have similar prey preferences may compete for resources. Overlap in range does not always result in direct interaction due to the potential for spatiotemporal resource partitioning through variation in the timing and location of foraging behavior (Ratcliffe et al 2014, Oviedo et al 2018, Genov et al 2019. This may lead to differences in habitat use among populations, resulting in different exposure to human activities (Genov et al 2019, Teixeira et al 2021.…”

Section: Introductionmentioning

confidence: 99%

Passive acoustic monitoring reveals spatiotemporal segregation of two fish-eating killer whale Orcinus orca populations in proposed critical habitat

Emmons

Hanson

Lammers³

2021

Endang. Species. Res.

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Competition for prey resources among ecologically similar populations that occur in sympatry can be reduced by spatiotemporal resource partitioning. Understanding patterns of habitat use of cetaceans can be difficult since they are highly mobile and can have large home ranges. We used passive acoustic monitoring at 15 sites along the coast of Washington State, USA, to assess habitat use patterns of 2 sympatric populations of fish-eating killer whales Orcinus orca: northern residents (NRKW) and southern residents (SRKW). This area is part of the ocean distributions of a number of important runs of Chinook salmon Oncorhyncus tshawytscha, the preferred prey of both populations, and is proposed critical habitat for SRKW. We compared monthly occurrence of both populations at recorder locations grouped by their proximity to the Strait of Juan de Fuca to the north and the Columbia River to the south in one analysis and by their distance from shore in a second analysis. NRKW and SRKW were detected throughout the year with spring and fall peaks in occurrence. The northernmost sites accounted for 93% of NRKW detections, while less than half of SRKW detections were at these sites. SRKW were most frequently detected at nearshore sites (83% of detections), while the majority of NRKW detections were at mid-shelf and deep sites (94% of detections). This study provides further information about the habitat use of these resident killer whale populations with implications for their management and conservation.

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Habitat partitioning mediates the coexistence of sympatric dolphins in a tropical fjord-like embayment

Cited by 9 publications

References 50 publications

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

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

The oxygen minimum zone relative depth is a key driver of dolphin habitats in the northern Humboldt Current System

Passive acoustic monitoring reveals spatiotemporal segregation of two fish-eating killer whale Orcinus orca populations in proposed critical habitat

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