Stable isotopes reveal different dependencies on benthic and pelagic pathways between Munida gregaria ecotypes

Funes, Manuela; Irigoyen, Alejo Joaquín; Trobbiani, Gastón Andres; Galván, David Edgardo

doi:10.1016/j.fooweb.2018.e00101

Cited by 18 publications

(13 citation statements)

References 40 publications

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“…We estimated lower TPs for the pelagic stage of 'gregaria' than for the benthic form. The same pat-tern was reported by Funes et al (2018) in the San Jorge Gulf, which could be the result of the different contribution of the pelagic and benthic energy pathways in the food webs. The TP occupied by both forms/stages (pelagic and benthic) gives them an important role in potentially shortening the food-web length.…”

Section: Ww Speciessupporting

confidence: 81%

“…In BC, previous studies have found no isotopic differences between the benthic forms of both morphotypes ('subrugosa' and 'gregaria'), having similar TP estimations (Pérez Barros et al 2010, Riccialdelli et al 2017a to each other and to those from northern Patagonian waters (e.g. San Jorge Gulf, Funes et al 2018). We estimated lower TPs for the pelagic stage of 'gregaria' than for the benthic form.…”

Section: Ww Speciescontrasting

confidence: 41%

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Trophic structure of southern marine ecosystems: a comparative isotopic analysis from the Beagle Channel to the oceanic Burdwood Bank area under a wasp-waist assumption

Riccialdelli

Becker

Fioramonti

et al. 2020

Mar. Ecol. Prog. Ser.

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Understanding the structure and functioning of marine ecosystems has become a critical issue to assess the potential short- and long-term effects of natural and anthropogenic impacts and to determine the knowledge needed to conduct appropriate conservation actions. This goal can be achieved in part by acquiring more detailed food web information and evaluating the processes that shape food web structure and dynamics. Our main objective was to identify large-scale patterns in the organization of pelagic food webs that can be linked to a wasp-waist (WW) structure, proposed for the southwestern South Atlantic Ocean. We evaluated 3 sub-Antarctic marine areas in a regional context: the Beagle Channel (BC), the Atlantic coast of Tierra del Fuego (CA) and the oceanic Burdwood Bank area (BB). We used carbon and nitrogen isotopic information of all functional trophic groups, ranging from primary producers to top predators, and analyzed them through stable isotope-based Bayesian analyses. We found that BC and BB have a more pronounced WW structure compared to CA. We identified species at mid to low trophic positions that play a key role in the trophodynamics of each marine area (e.g. Fuegian sprat Sprattus fuegensis, longtail southern cod Patagonotothen ramsayi and squat lobster Munida gregaria) and considered them as the most plausible WW species. The identification of the most influential species within food webs has become a crucial task for conservation purposes in local and regional contexts to maintain ecosystem integrity and the supply of ecosystem services for the southwestern South Atlantic Ocean.

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Section: Ww Speciessupporting

confidence: 81%

Section: Ww Speciescontrasting

confidence: 41%

Trophic structure of southern marine ecosystems: a comparative isotopic analysis from the Beagle Channel to the oceanic Burdwood Bank area under a wasp-waist assumption

Riccialdelli

Becker

Fioramonti

et al. 2020

Mar. Ecol. Prog. Ser.

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“…The continued monitoring of this marine reserve in the coming years is more necessary than ever, in order to better understand the mechanisms underlying the exceptional response of the reef fish assemblage to protection measures. In addition, complementary studies such as functional [ 9 , 79 ] and tropho-dynamic [ 80 ] modelling of the reserve effect, as well as diet studies through stable isotopes [ 81 ], would help to fully understand the changes that have occurred among the trophic groups as a result of protection, and to explain the exceptionally high biomass values observed over time.…”

Section: Discussionmentioning

confidence: 99%

Exceptionally high but still growing predatory reef fish biomass after 23 years of protection in a Marine Protected Area

2021

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Marine Protected Areas (MPAs) help replenish fish assemblages, though different trophic levels may show diverse recovery patterns. Long-term protection is required to achieve total recovery but poaching events may prevent the achievement of full carrying capacity. Here, we have analysed the effect of long-term protection on the entire reef fish community and the different trophic levels in the Cabo de Palos-Islas Hormigas MPA (SE Spain; SW Mediterranean Sea) in order to assess their recovery patterns after 23 years of protection. We compared the values for carrying capacity obtained with the maximum values achieved at regional scale, and we assessed the effect of a reduction in the surveillance over a few years, during which poaching events increased, on the recovery patterns. We found that, overall, biomass of fishes increased with time while density diminished. In particular, piscivorous and macro-invertivore fish increased while the other trophic groups remained constant or declined, suggesting top-down processes. For the entire study period, those trophic groups were approaching carrying capacity; however, when accounting only for the period in which enforcement was high and constant, they grew exponentially, indicating that full carrying capacity may have not been achieved yet. When compared to other Mediterranean MPAs, the Cabo de Palos-Islas Hormigas MPA showed values for biomass that were disproportionately higher, suggesting that local factors, such as habitat structure and associated oceanographic processes, may be responsible for the dynamics found. Our results help to understand the potential trajectories of fish assemblages over a consolidated MPA and highlight empirically how the reduction of surveillance in a period may change the recovery patterns.

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“…Therefore, a fully pelagic lifestyle (e.g., Gutiérrez et al, 2008) seems to be possible, at least temporarily. Most likely, squat lobsters feed rather opportunistically on benthic invertebrates and sulfur bacteria mats on the seafloor as well as on phyto-and zooplankton in the surface layer (Gallardo et al, 1994;Contreras et al, 2007;Funes et al, 2018).…”

Section: Food-web Structure and Key Players Of The Northern Humboldt Current Upwelling Systemmentioning

confidence: 99%

Toward a Solution of the “Peruvian Puzzle”: Pelagic Food-Web Structure and Trophic Interactions in the Northern Humboldt Current Upwelling System Off Peru

et al. 2022

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The northern Humboldt Current upwelling system (HCS) belongs to the most productive marine ecosystems, providing five to eight times higher fisheries landings per unit area than other coastal upwelling systems. To solve this “Peruvian puzzle”, to elucidate the pelagic food-web structure and to better understand trophic interactions in the HCS, a combined stable isotope and fatty acid trophic biomarker approach was adopted for key zooplankton taxa and higher trophic positions with an extensive spatial coverage from 8.5 to 16°S and a vertical range down to 1,000 m depth. A pronounced regional shift by up to ∼5‰ in the δ15N baseline of the food web occurred from North to South. Besides regional shifts, δ15N ratios of particulate organic matter (POM) also tended to increase with depth, with differences of up to 3.8‰ between surface waters and the oxygen minimum zone. In consequence, suspension-feeding zooplankton permanently residing at depth had up to ∼6‰ higher δ15N signals than surface-living species or diel vertical migrants. The comprehensive data set covered over 20 zooplankton taxa and indicated that three crustacean species usually are key in the zooplankton community, i.e., the copepods Calanus chilensis at the surface and Eucalanus inermis in the pronounced OMZ and the krill Euphausia mucronata, resulting in an overall low number of major trophic pathways toward anchovies. In addition, the semi-pelagic squat lobster Pleuroncodes monodon appears to play a key role in the benthic-pelagic coupling, as indicated by highest δ13C’ ratios of −14.7‰. If feeding on benthic resources and by diel vertical migration, they provide a unique pathway for returning carbon and energy from the seafloor to the epipelagic layer, increasing the food supply for pelagic fish. Overall, these mechanisms result in a very efficient food chain, channeling energy toward higher trophic positions and partially explaining the “Peruvian puzzle” of enormous fish production in the HCS.

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Stable isotopes reveal different dependencies on benthic and pelagic pathways between Munida gregaria ecotypes

Cited by 18 publications

References 40 publications

Trophic structure of southern marine ecosystems: a comparative isotopic analysis from the Beagle Channel to the oceanic Burdwood Bank area under a wasp-waist assumption

Trophic structure of southern marine ecosystems: a comparative isotopic analysis from the Beagle Channel to the oceanic Burdwood Bank area under a wasp-waist assumption

Exceptionally high but still growing predatory reef fish biomass after 23 years of protection in a Marine Protected Area

Toward a Solution of the “Peruvian Puzzle”: Pelagic Food-Web Structure and Trophic Interactions in the Northern Humboldt Current Upwelling System Off Peru

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