Distribution of myctophid resources in the Indian Ocean

Vipin, P. M.; Ravi, Renju; Fernández, Teresa; Pradeep, Kumar G.; Boopendranath, M.R.; Remesan, M.P.

doi:10.1007/s11160-011-9244-4

Cited by 18 publications

(14 citation statements)

References 5 publications

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“…For lanternfishes, this information is taxonomically sparse and both geographically and temporally localized [e.g., [46][47][48]. Overexploitation is especially poised to adversely affect lanternfishes, as interest in the commercial use of their worldwide biomass as a fisheries product has grown in the past decade [2,49]. Given the role these fishes play in numerous food webs [50,51] and in fishmediated sequestration of carbon [52,53] and dispersal of anthropogenically introduced pollutants such as microplastics [54], global population-level data on these fishes is essential to provide policy recommendations for midwater resources as we enter a new frontier of oceanic resource extraction [2, 55].…”

Section: Practical Implications Of Rate Trends and Shifts In Lanternfishesmentioning

confidence: 99%

Diversification Patterns of Lanternfishes Reveal Multiple Rate Shifts in a Critical Mesopelagic Clade Targeted for Human Exploitation

Denton

2018

Current Biology

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The mesopelagic (midwater) and deep-sea environments together comprise over 90% of the volume of the world ocean [1] and provide services that are only recently becoming recognized [2]. One of the most significant of these services relates to midwater fish biomass, recently estimated to be two orders of magnitude larger than the current worldwide fisheries catch [3, 4]. Calls to exploit midwater fish biomass have increased despite warnings about the unknown recovery potential of such organisms [2] and despite existing data suggesting that deep-sea fishes could be classified as endangered [5]. Here, to provide a null model for the respondability of midwater fishes, I use lanternfishes-which comprise the majority of worldwide midwater fish biomass [6]-to examine the diversification response of a critical midwater clade to oceanic changes over evolutionary timescales, including several extinction and turnover events. Using a time-calibrated molecular phylogeny based on seven autosomal protein-coding loci, with over 50% species sampling and three ingroup node calibrations, I show that lanternfishes exhibit a continuously increasing diversification rate, consistent with nonequilibrium speciation dynamics, and three major evolutionary rate shift locations with timing that is similar to those of marine clades in more well-known environments. These results suggest that lanternfish diversification patterns overlapped with major events in the physical partitioning of the ocean volume and that the clade has responded positively to a range of pre-Anthropocene extinction drivers [7]. However, lanternfish respondability to modern extinction drivers-habitat loss and overexploitation-is best addressed with populational and ecological data and remains largely unknown.

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Section: Practical Implications Of Rate Trends and Shifts In Lanternfishesmentioning

confidence: 99%

Diversification Patterns of Lanternfishes Reveal Multiple Rate Shifts in a Critical Mesopelagic Clade Targeted for Human Exploitation

Denton

2018

Current Biology

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“…They also raise the maximum known size of the species from 73 mm (Quéro et al, 2009) to 82 mm SL. Second, to the best of our knowledge, the single Diaphus bertelseni caught in a deep trawl close to the La Pérouse seamount is the first record of the species in the Indian Ocean (Vipin et al, 2012). D. bertelseni was previously recorded in tropical to temperate seas in the Atlantic and Pacific oceans (Paxton and Hulley, 1999;Craddock and Hartel, 2002;Robertson and Clements, 2015;Hulley and Paxton, 2016).…”

Section: Notable Recordsmentioning

confidence: 90%

“…All but one species (Diaphus bertelseni) of myctophid caught during the four cruises had been previously recorded in the Indian Ocean (Vipin et al, 2012). According to their distribution patterns (Hulley, 1981), the 49 myctophid species were partitioned either as highoceanic or pseudoceanic.…”

Section: Mesopelagic Fish Taxamentioning

confidence: 99%

Micronektonic fish species over three seamounts in the southwestern Indian Ocean

Cherel

Romanov²,

Annasawmy³

et al. 2020

Deep Sea Research Part II: Topical Studies in Oceanography

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Taxonomic composition, abundance and biological features of micronektonic fish were investigated using pelagic trawls conducted near and over the summits of three seamounts located in the western Indian Ocean (La Pérouse, MAD-Ridge and Walters Shoal). Mesopelagic fish from three families accounted for 80% by number of the total catch (5714 specimens, 121 taxa), namely myctophids (59%), gonostomatids (12%) and sternoptychids (9%). Whereas the gonostomatid Sigmops elongatus was the most abundant species around La Pérouse seamount, myctophids were the most diverse and dominant group by number in all three studied areas. Most myctophids were high-oceanic species, which included the numerically dominant Benthosema suborbitale, Ceratoscopelus warmingii, Diaphus perspicillatus, Hygophum hygomii, and Lobianchia dofleini. The few remaining myctophids (Diaphus suborbitalis being the most abundant) were pseudoceanic fish, highlighting the association with landmasses. The study adds one myctophid species new to the Indian Ocean (Diaphus bertelseni), and a second record in the literature of the recently described sternoptychid Argyripnus hulleyi.

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“…With regards to the fish for which NFA analysis was made, region D was the only region where small fish were encountered. In addition, in + − = the western Indian Ocean, the monsoon circulation largely influences the oceanographic conditions and biological productivity (Schott and McCreary Jr., 2001), which in turn affects the prey of large pelagic predators such as tunas (Vipin et al, 2012). Thus, the following four distinct seasons were taken into consideration in our analyses: the North-Eastern Monsoon (NEM, from mid-November to mid-March), Spring Inter-Monsoon (SIM, from mid-March to mid-May), South-Western Monsoon (SWM, from mid-May to mid-September) and Autumn Inter-Monsoon (AIM, from mid-September to mid-November).…”

Section: Discussionmentioning

confidence: 99%

Spatial variation in stable isotopes and fatty acid trophic markers in albacore tuna (Thunnus alalunga) from the western Indian Ocean

Dhurmeea

Langlais

Somes

et al. 2020

Deep Sea Research Part I: Oceanographic Research Papers

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Albacore tuna (Thunnus alalunga) is a highly economically important species in the western Indian Ocean. However, knowledge of its ecological and nutritional characteristics, essential for proper management of the species, is lacking in the region. The trophodynamics of the Indian Ocean albacore was thus examined using known fatty acid trophic markers (FATMs) of primary producers, nutritional condition indices (NCIs) (omega-3/omega-6 ratio and total fatty acid content (TFA)), and baseline and lipid corrected stable isotope of carbon (δ13Ccorr) and nitrogen (δ15Ncorr), measured in the muscle tissue. We applied generalized additive mixed models to understand the spatiotemporal patterns and drivers of these tracers, taking into consideration several intrinsic and extrinsic variables: fish size, fishing position, month, chlorophyll-a and sea surface temperature (SST). Both chlorophyll-a and SST were significant as single explanatory variables for all tracers with SST being the best predictor for docosahexaenoic acid/eicosapentaenoic acid ratio, the omega-6 protists FATM, omega-3/omega-6 ratio and δ15Ncorr. TFA was best predicted by fish size only. The best model for δ13Ccorr for males included fishing position only while that for females included fish size, fishing position and month. Higher primary productivity, as inferred by high δ13Ccorr values and diatom contribution, nutritional condition and trophic position, as inferred by high δ15Ncorr values, were observed in albacore from the temperate southern waters than in the northern tropical regions. Relationships between environmental variables and corrected stable isotopes, FATMs confirm that ocean warming and changes in primary productivity will impact nutrient flow and energy transfer in the marine food web which may have negative nutritional outcomes for albacore. This knowledge is particularly crucial in areas where oceanographic conditions and seawater temperatures are changing at a fast rate and should also be taken into consideration by fisheries managers. Highlights► A multi-tracer approach was taken to examine the trophodynamics of albacore tuna. ► Albacore inhabiting temperate southern waters feed on a diatom-based food web. ► Albacore trophic position was lowest in the northern tropical waters. ► Ontogenetic shifts in stable carbon and nitrogen isotopes were observed. ► High seawater temperature lowers the nutritional condition of albacore.

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Distribution of myctophid resources in the Indian Ocean

Cited by 18 publications

References 5 publications

Diversification Patterns of Lanternfishes Reveal Multiple Rate Shifts in a Critical Mesopelagic Clade Targeted for Human Exploitation

Diversification Patterns of Lanternfishes Reveal Multiple Rate Shifts in a Critical Mesopelagic Clade Targeted for Human Exploitation

Micronektonic fish species over three seamounts in the southwestern Indian Ocean

Spatial variation in stable isotopes and fatty acid trophic markers in albacore tuna (Thunnus alalunga) from the western Indian Ocean

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