Bounds on Biomass Estimates and Energetic Consequences of Ctenophora in the Northeast U.S. Shelf Ecosystem

Ford, Michael; Link, Jason S.

doi:10.1155/2014/851809

Cited by 6 publications

(7 citation statements)

References 31 publications

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“…Atlantic herring abundance increased again in the late 1980s through the early 2000s, and their importance in the diet of spiny dogfish followed, peaking at 35 % of the spiny dogfish diet by weight (Overholtz and Link 2007). Also, the occurrence of ctenophores in spiny dogfish diets has increased over the last decade, most likely a reflection of their increased abundance in the Georges Bank coastal area (Link and Ford 2006;Ford and Link 2014).…”

Section: Food Habitsmentioning

confidence: 99%

Who let the dogfish out? A review of management and socio-economic aspects of spiny dogfish fisheries

Dell’Apa

Bangley

Rulifson

2014

Rev Fish Biol Fisheries

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Multi-scaled integrated analysis across biological, economic, social, and political aspects of fisheries is needed to provide effective management strategies. These aspects are naturally conflicting and, when converged into objectives, are seldom optimized at the same time scale. For example, biological objectives are usually considered in the long-term, whereas socio-economic and political objectives are commonly considered in the short-term. Additionally, fishery managers have frequently struggled to integrate different information arising from each aspect of fishery management. The employment of integrative analysis to shark fishery management is particularly needed because of the unique biology and life history characteristics of sharks, and the increasing threat of human exploitation that affects their conservation status. One species that may serve as a model for the intersection of the myriad of aspects of elasmobranch management is the spiny dogfish (Squalus acanthias). This commercial shark species was recently considered, unsuccessfully, for inclusion in trade-regulation lists due to international concern about its conservation status. The need to provide thorough integration of biology, life history, and ecology of spiny dogfish with information concerning the commercial trade, socio-economic, and political aspects of the fishery has now reached a critical juncture. We attempt to provide such an integration in this paper. First, we review basic biology and life history characteristics of spiny dogfish and then integrate this information into aspects of the international trade for the species. This is done using the framework of two of the most significant fishery management governance systems affecting the international management of the species and its conservation status (i.e., the MagnusonStevens Fishery Conservation and Management Act in the USA, and the Common Fisheries Policy in the European Union). Our analysis indicates that to achieve effective fishery management of spiny dogfish stocks and populations at international, national, regional, and local levels there is still the need to understand and integrate socio-economic, political and ecosystem-based aspects outside the framework of national fishery jurisdictions.

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Section: Food Habitsmentioning

confidence: 99%

Who let the dogfish out? A review of management and socio-economic aspects of spiny dogfish fisheries

Dell’Apa

Bangley

Rulifson

2014

Rev Fish Biol Fisheries

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Section: Introductionmentioning

confidence: 99%

“…Scientific reports have indicated the increase of the abundances and the instances blooms of the planktonic Ctenophores and the Hydromedusae in the marine ecosystems, especially in the enclosed seas and the semi-enclosed seas (Baltic Sea, Gulf of Mexico and Mediterranean sea) (Xian et al, 2005;Lynam et al, 2006;Ford and Link, 2014;Dehghan et al, 2017). The expanding of this macrozooplankton is attributed to the combined impacts of many factors mainly, the climate change, eutrophication and overfishing (Fraser, 1970;Ford and Link, 2014). On the other hand, their role in the food regime of the marine coastal waters became more understandable and noticeable throughout the results of many studies focusing on their role in the food chains (preys and predators) in the marine ecosystems (Lynam et al, 2006;Pitt et al, 2008;Dehghan et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

New Record of Pleurobrachia Pileus (O. F. Müller, 1776) (Ctenophora, Cydippida) From Coral Reef, Iraqi Marine Waters

Mohammed

Ali

2020

Bull. Iraq nat. Hist. Mus.

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The aim of this paper is to present the first record of ctenophore species Pleurobrachia pileus (O. F. Müller, 1776) in the coral reef as was recently found in Iraqi marine waters. The specimens were collected from two sites, the first was in Khor Abdullah during May 2015, and the second site was located in the pelagic water of the coral reef area, near the Al-Basrah deep sea crude oil marine loading terminal. Three samples were collected at this site during May 2015, February and March 2018 which showed that P. pileus were present at a densities of 3.0, 2.2 and 0.55 ind./ m 3 respectively. The species can affect on the abundance of other zooplankton community through predation. The results of examining the stomach contents revealed that they are important zooplanktivorous species; their diets comprised large number of zooplankton as well as egg and fish larvae. The calanoid copepods formed the highest percentage of the diet, reaching 47%, followed by cyclopoid copepods 30%, and then the fish larvae formed 20% of the diet. The current investigation showed that the density of zooplankton decreased significantly in the second site of all the groups, but the highest was in Calanoida group (324 ind./ m 3) coincident with the presence of noticeable numbers of P. pileus (0.55-3.0 ind./ m 3), in the same site compared to the density of Calanoida in the first site, which amounted to 991ind./ m 3 ; as well, the increase was noticeable in relation to the rest of the other groups of zooplankton during the same period; such a state confirms the effect of predation by P. pileus on the zooplankton community. The study recommended that more attention should be given to investigate this group of zooplankton, and specific care should be exerted in preserving the specimens collected from the sea.

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“…The northeast US continental shelf fish community has had a long history of anthropogenic influence, including overfishing (Sherman et al ., ; Fogarty and Murawski, ), and effects of climate change (Nye et al ., ). The status of GZ for this shelf has been explored in several capacities from fishes as samplers of GZ (Link and Ford, ; Ford and Link, ) to full ecosystem models incorporating GZ as a major taxa group given their notable presence (Link et al ., ). However, these works highlight both the challenges of sampling and modeling GZ, and emphasize its inclusion in models for better ecosystem understanding particularly with documented increases in GZ abundance for this shelf.…”

Section: Introductionmentioning

confidence: 99%

Bloom or bust: synchrony in jellyfish abundance, fish consumption, benthic scavenger abundance, and environmental drivers across a continental shelf

Smith

Ford

Link

2016

Fisheries Oceanography

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Increases in gelatinous zooplankton (GZ) populations, their dominance of some ecosystems, their impacts to other taxa, and their questionable trophic value remain global concerns, but they are difficult to quantify. We compared trends in GZ abundance from direct sampling for the northeast U.S. continental shelf and tested their association with GZ consumption by spiny dogfish (Squalus acanthias); the abundance of two benthic scavengers: Atlantic hagfish (Myxine glutinosa) and grenadiers (Family: Macrouridae); and four environmental indices: Atlantic Multidecadal Oscillation, North Atlantic Oscillation, and sea surface and bottom temperatures. Defined as scyphozoans, siphonophores, ctenophores, and salps, the abundance of GZ on the shelf has oscillated with blooms approximately every 10–15 yr. Conservative estimates of annual removal of GZ by spiny dogfish ranged from approximately 0.3–298 g individual−1 with spiny dogfish being the primary GZ feeder sampled on the shelf. The examination of three abundance series for GZ identified one shelf‐wide trend and strong relationships with 2‐yr lagged consumption and scavenger abundance (namely hagfish), and sea surface temperature. With multimodel inference, these covariates led to an optimal model of GZ abundance. Blooms of GZ abundance on this shelf were influenced by environmental change, provide surges of food for spiny dogfish, and may offer ‘food falls’ for scavenging fishes. The bioenergetic tradeoffs of consuming greater amounts of GZ compared to other major prey (e.g., fishes) remain unknown; however, these surges of food in the northwest Atlantic appear to be important for fishes, including support for benthic scavenger productivity.

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Bounds on Biomass Estimates and Energetic Consequences of Ctenophora in the Northeast U.S. Shelf Ecosystem

Cited by 6 publications

References 31 publications

Who let the dogfish out? A review of management and socio-economic aspects of spiny dogfish fisheries

Who let the dogfish out? A review of management and socio-economic aspects of spiny dogfish fisheries

New Record of Pleurobrachia Pileus (O. F. Müller, 1776) (Ctenophora, Cydippida) From Coral Reef, Iraqi Marine Waters

Bloom or bust: synchrony in jellyfish abundance, fish consumption, benthic scavenger abundance, and environmental drivers across a continental shelf

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