Spatio-temporal distribution of skipjack in relation to oceanographic conditions in the west-central Pacific Ocean

Wang, Jintao; Chen, Xinjun; Chen, Yong

doi:10.1080/01431161.2016.1256509

Cited by 14 publications

(7 citation statements)

References 23 publications

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“…Incomplete migration offers one possible explanation for the evident but potentially uninformative genetic differentiation found in skipjack. Large-scale movements in Pacific skipjack are neither well documented nor ubiquitous and predictable (Wang et al, 2016a). Based on otolith analyses, some Pacific fish remain residents of the tropics their entire lives, while others make repeated trips into subtropical water (Arai et al, 2005).…”

Section: Discussionmentioning

confidence: 99%

No Population Genetic Structure of Skipjack Tuna (Katsuwonus pelamis) in the Tropical Western and Central Pacific Assessed Using Single Nucleotide Polymorphisms

et al. 2020

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Skipjack tuna (Katsuwonus pelamis) has historically been considered panmictic at the ocean basin scale because of the species’ life history and substantial absolute population size. However, recent advances in population genomics have enabled scientists to demonstrate population structure in other species that were likewise traditionally assumed to be panmictic. Accordingly, we used DArTseq, a proprietary platform of reduced-representation genome sequencing developed by Diversity Arrays Technology (DArTech) to genotype 222 skipjack tuna from 9 sample groups collected across 6 exclusive economic zones (EEZs) and over 6 years in the tropical Western and Central Pacific Ocean. This is one of the most fine-scale population genetics assessments of skipjack tuna to date. We found several statistically significant pairwise FST comparisons using purportedly neutral loci, but very little indication of structure based on observed and expected heterozygosity, effective population size, a Mantel test, AMOVA, numerous genetic clustering and population assignment tests, and exploration of correlation with oceanographic features. Significant pairwise FST values were often shallow and resulted in uncertainty about their biological significance. Furthermore, a test of the hypothesis that the geographic and temporal distribution of the potentially adaptive genetic diversity may depict cryptic fine scale structure using two different outlier detection methods, could not reject panmixia based on estimates of fixation indices and two clustering software. Our results support the presence of a single population of skipjack tuna in the tropical Western and Central Pacific Ocean, but highly recommend the expansion of the study area, in latitude, longitude, and seasonality, before drawing any global conclusions.

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Section: Discussionmentioning

confidence: 99%

No Population Genetic Structure of Skipjack Tuna (Katsuwonus pelamis) in the Tropical Western and Central Pacific Assessed Using Single Nucleotide Polymorphisms

et al. 2020

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“…The oceans' top predators including seabirds, cetaceans and pinnipeds seek out their prey in an environment that is not only vast but often complex. The location and abundance of prey is influenced by localised climatic and physical processes (Santos et al 2006), and also wide‐ranging oceanographic effects such as El Niño (Funes‐Rodriguez et al 2006, Chen et al 2007, Wang et al 2016). While many seabirds exhibit high levels of behavioural flexibility to contend with the resultant variability in the location of their food in the oceans (Kowalczyk et al 2015, Castillo‐Guerrero et al 2016), the degree of flexibility is reported to differ depending on large‐scale biogeographical factors (Weimerskirch 2007).…”

Section: Introductionmentioning

confidence: 99%

Linking foraging and breeding strategies in tropical seabirds

Soanes

Green

Bolton

et al. 2021

Journal of Avian Biology

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The archetypal foraging behaviour of tropical seabirds is generally accepted to differ from that of their temperate and polar breeding counterparts, with the former exhibiting less predictable foraging behaviour associated with the less predictable prey of the tropical marine environment. Similarly, temperate and polar species have predictable, annual breeding seasons, enabling them to profit during periods of the year when prey availability is highest, while tropical seabird species exhibit considerable variability in their breeding strategies. Until now, the reasons for such variation in breeding strategies between tropical seabirds are yet to be investigated. We hypothesise that while some tropical species breed asynchronously in response to unpredictable fluctuations in prey availability, others adopt a seasonal breeding strategy for the same reasons that temperate and polar species do. Consequently, the predictability of seabird foraging behaviour in the tropics may be related to breeding strategy, with populations that breed seasonally exhibiting more predictable foraging behaviour than those that breed aseasonally. To test these predictions, we used GPS tracking to examine the foraging behaviour of two closely related tropical seabird species that colonise the same island yet exhibit markedly different breeding strategies: the asynchronously breeding brown booby Sula leucogaster and the seasonal breeding masked booby Sula dactylatra. We obtained tracks for 251 birds over five years. We found that brown boobies forage less predictably than masked boobies, indicated by larger core foraging areas, lower levels of foraging area overlap between individuals and exhibit more variability between breeding periods. Our results challenge the view that the foraging behaviour of tropical seabirds is always less predictable than that of seabirds breeding in temperate and polar regions and highlight the considerable variability in the breeding and foraging strategies adopted by tropical seabirds which demand further exploration.

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“…Several environmental parameters are used to predict fish habitats and show a positive response. Several studies have even proven that oceanographic parameters have high significance for the distribution of fish in the waters (Wang et al 2016;Artetxe-Arrate et al 2020;Syah et al 2020). This study focused on skipjack tuna and its relationship with certain oceanographic factors (SST and SSC).…”

Section: Discussionmentioning

confidence: 99%

“…Oceanographic data has a significant relationship, especially with SST parameters (Tseng et al 2010;Wang et al 2016). As seen in Figure 3, the GAM test results show that the skipjack tuna catches have a relationship with SST parameters (Figure 3.A) and SSC (Figure 3.B).…”

Section: Skipjack Tuna's Relation To Oceanography Variablesmentioning

confidence: 91%

Mapping spatial-temporal skipjack tuna habitat as a reference for Fish Aggregating Devices (FADs) settings in Makassar Strait, Indonesia

et al. 2021

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Abstract. Hidayat R, Zainuddin M, Mallawa A, Mustapha MA, Putri ARS. 2021. Mapping spatial-temporal skipjack tuna habitat as a reference for Fish Aggregating Devices (FADs) settings in Makassar Strait, Indonesia. Biodiversitas 22: 3637-3647. Skipjack tuna (Katsuwonus pelamis) has a high economic value in the international market. Catching skipjack tuna using fish aggregating devices (FADs) without knowing its habitat characteristics can damage the ecosystem. This study aimed to determine suitable fishing areas for setting skipjack’s FADs. The data used included that on catch, sea surface temperature (SST), and sea surface chlorophyll-a (SSC) in the Makassar Strait obtained for 2017-2019. The generalized additive model (GAM) and empirical cumulative distribution function (ECDF) analyses were used to investigate the skipjack’s tuna habitat. A pelagic habitat index (PHI), with PHI > 75%, was applied to determine suitable FAD positions. The gravity center of the skipjack tuna habitat for ten months (January-October 2020) was calculated to validate the model’s results. The results showed that the optimum SST range was from 28.78°C to 31.25°C, while the SSC from 0.18 to 0.28 mg m-3. The best skipjack habitats in the southern Makassar Strait are criterion 4 (PHI > 90%) and criterion 3 (PHI = 85-90%), having a relatively high consistency of the average PHI values. These results can help determine the optimal positions for setting FADs to benefit the global management and sustainable development of skipjack tuna fisheries.

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Spatio-temporal distribution of skipjack in relation to oceanographic conditions in the west-central Pacific Ocean

Cited by 14 publications

References 23 publications

No Population Genetic Structure of Skipjack Tuna (Katsuwonus pelamis) in the Tropical Western and Central Pacific Assessed Using Single Nucleotide Polymorphisms

No Population Genetic Structure of Skipjack Tuna (Katsuwonus pelamis) in the Tropical Western and Central Pacific Assessed Using Single Nucleotide Polymorphisms

Linking foraging and breeding strategies in tropical seabirds

Mapping spatial-temporal skipjack tuna habitat as a reference for Fish Aggregating Devices (FADs) settings in Makassar Strait, Indonesia

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