Mesh size effects on assessments of planktonic hydrozoan abundance and assemblage structure

Júnior, Miodeli Nogueira; Pukanski, Luis Eduardo de M.; Souza-Conceição, José Maria

doi:10.1016/j.jmarsys.2014.11.014

Cited by 14 publications

(16 citation statements)

References 30 publications

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“…Explaining the similarities (and differences) of the gelatinous catches One explanation for the similarity of gelatinous mesozooplankton catches recorded in samples of the Gulf VII and the ring net is the fact that their net mesh sizes were close to 200 μm (ring net = 200 μm, Gulf VII = 250 μm). Several researchers have previously demonstrated that a mesh of 200 μm is suitable for studying most hydromedusae (Cornelius 1995;Nogueira et al 2015;Hosia et al 2017), and this likely applies to other gelatinous mesozooplankton from the phyla Chordata and Ctenophora (Licandro et al 2015). Nogueira et al (2015) found that 200 and 500 μm bongo nets captured statistically different hydromedusae abundances, biomasses, and taxonomic diversity when deployed at the same stations.…”

Section: Comparing Gelatinous Abundance and Compositionmentioning

confidence: 99%

“…Several researchers have previously demonstrated that a mesh of 200 μm is suitable for studying most hydromedusae (Cornelius 1995;Nogueira et al 2015;Hosia et al 2017), and this likely applies to other gelatinous mesozooplankton from the phyla Chordata and Ctenophora (Licandro et al 2015). Nogueira et al (2015) found that 200 and 500 μm bongo nets captured statistically different hydromedusae abundances, biomasses, and taxonomic diversity when deployed at the same stations. The authors concluded that this was likely due to the extrusion of smaller organisms through the 500 μm net.…”

Section: Comparing Gelatinous Abundance and Compositionmentioning

confidence: 99%

“…To increase comparability of samples, a maximum sampling depth of 100 m was chosen for all deployments, and all samples were collected during the day. The two nets differed slightly in mesh size (ring net = 200 μm, Gulf VII = 250 μm), but these meshes have been described as appropriate mesh sizes for sampling gelatinous meso-zooplankton (Cornelius 1995;Nogueira et al 2015;Hosia et al 2017).…”

Section: Sample Collectionmentioning

confidence: 99%

“…This is mainly because they are fragile, and they are often damaged or destroyed by many zooplankton samplers as a result (Hamner et al 1975;Remsen et al 2004). As gelatinous zooplankton are an assemblage of gelatinous organisms from three different phyla (Cnidaria, Ctenophora, and Chordata;Haddock 2004), they display a great diversity in terms of shape, size (Nogueira et al 2015;Hosia et al 2017), life cycle, and life strategy (Raskoff et al 2003;Boero et al 2008). This morphological and ecological diversity makes it even more difficult to sample entire gelatinous zooplankton assemblages using any one sampler.…”

mentioning

confidence: 99%

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A novel platform for monitoring gelatinous mesozooplankton: The high‐speed Gulf VII sampler quantifies gelatinous mesozooplankton similar to a ring net

Long

O’Donnell

Haberlin

et al. 2020

Limnology & Ocean Methods

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Our understanding of the distribution and abundance of gelatinous mesozooplankton (0.2-20 mm) has been largely determined from the deployment of net sampling devices. Although zooplankton nets have been shown to underrepresent the abundance of certain gelatinous taxa in comparison to data from optical systems, nets still provide relative abundances for gelatinous zooplankton. A potential source of standardized, long-term, and broad-scale data for the relative abundance and distribution of gelatinous mesozooplankton is from fisheries monitoring programs which use zooplankton samplers such as the high-speed Gulf VII sampler to capture fish eggs and larvae in shelf and offshore waters. To evaluate the use of the Gulf VII sampler as a source of gelatinous mesozooplankton data, this study collected zooplankton samples using both a Gulf VII sampler and a vertical ring net at 15 stations off the northwest Irish and Scottish coasts in July 2017. The difference in the estimates of gelatinous mesozooplankton abundance and taxon richness of the Gulf VII and the ring net samples were not significant (mean abundance: Gulf VII = 135.7 AE 79.7 ind. m −3 , ring net = 149.7 AE 66.5 ind. m −3 ; taxon richness: Gulf VII = 15.2 AE 2.4, ring net = 15.4 AE 2.5), although the Gulf VII underestimated the abundance of the appendicularian Oikopleura sp. by a factor of 9.7 when compared to the ring net. Our findings describe how added value can be provided to already existing zooplankton monitoring programs while enhancing the temporal and spatial coverage of data available for gelatinous mesozooplankton.

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Section: Comparing Gelatinous Abundance and Compositionmentioning

confidence: 99%

Section: Comparing Gelatinous Abundance and Compositionmentioning

confidence: 99%

Section: Sample Collectionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

A novel platform for monitoring gelatinous mesozooplankton: The high‐speed Gulf VII sampler quantifies gelatinous mesozooplankton similar to a ring net

Long

O’Donnell

Haberlin

et al. 2020

Limnology & Ocean Methods

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show abstract

“…However, most studies only use a single sampling method, or a few at most, which has implications for the range of taxa caught. Few studies have compared the selectivity and efficacy of different methodologies in studying gelatinous fauna (but see [ 6 , 7 ]). Sampling conducted during the RV G.O.…”

Section: Introductionmentioning

confidence: 99%

Abundance, distribution and diversity of gelatinous predators along the northern Mid-Atlantic Ridge: A comparison of different sampling methodologies

et al. 2017

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The diversity and distribution of gelatinous zooplankton were investigated along the northern Mid-Atlantic Ridge (MAR) from June to August 2004.Here, we present results from macrozooplankton trawl sampling, as well as comparisons made between five different methodologies that were employed during the MAR-ECO survey. In total, 16 species of hydromedusae, 31 species of siphonophores and four species of scyphozoans were identified to species level from macrozooplankton trawl samples. Additional taxa were identified to higher taxonomic levels and a single ctenophore genus was observed. Samples were collected at 17 stations along the MAR between the Azores and Iceland. A divergence in the species assemblages was observed at the southern limit of the Subpolar Frontal Zone. The catch composition of gelatinous zooplankton is compared between different sampling methodologies including: a macrozooplankton trawl; a Multinet; a ringnet attached to bottom trawl; and optical platforms (Underwater Video Profiler (UVP) & Remotely Operated Vehicle (ROV)). Different sampling methodologies are shown to exhibit selectivity towards different groups of gelatinous zooplankton. Only ~21% of taxa caught during the survey were caught by both the macrozooplankton trawl and the Multinet when deployed at the same station. The estimates of gelatinous zooplankton abundance calculated using these two gear types also varied widely (1.4 ± 0.9 individuals 1000 m-3 estimated by the macrozooplankton trawl vs. 468.3 ± 315.4 individuals 1000 m-3 estimated by the Multinet (mean ± s.d.) when used at the same stations (n = 6). While it appears that traditional net sampling can generate useful data on pelagic cnidarians, comparisons with results from the optical platforms suggest that ctenophore diversity and abundance are consistently underestimated, particularly when net sampling is conducted in combination with formalin fixation. The results emphasise the importance of considering sampling methodology both when planning surveys, as well as when interpreting existing data.

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Investigating pelagic biodiversity and gelatinous zooplankton communities in the rapidly changing European Arctic: An eDNA metabarcoding survey

Murray,

Priest,

Antich

et al. 2024

Environmental DNA

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Fram Strait, the gateway between the Arctic and Atlantic Oceans, is undergoing major climate change‐induced physical and biological transformations. In particular, rapid warming and ongoing “Atlantification” are driving species range shifts and altering food web structures in the Arctic. Understanding and predicting the consequences of these processes on future ecosystems requires detailed assessments of local and pelagic biodiversity. Gelatinous zooplankton (GZP) is an important component of pelagic communities, and recent evidence indicates that such communities are undergoing major changes in the Fram Strait. However, as sampling GZP is challenging, they are regularly underestimated in biodiversity, distribution, and abundance. To overcome this and address existing ecological knowledge gaps, we investigated patterns of pelagic metazoan diversity in Fram Strait using environmental DNA (eDNA) metabarcoding of the cytochrome c oxidase I (COI) gene. We successfully detected a broad range of taxa from the marine metazoan and GZP communities across sampling locations and ocean depth zones. We demonstrate the vertical structuring of diversity and elucidate relationships between taxa and water mass indicators, such as salinity and temperature. Furthermore, when comparing eDNA data with net and video transect data for GZP at the same period and location, we found that eDNA uncovered a higher number of taxa, including several that were not detected by the other methods. This study is a contribution to the formation of baseline Arctic GZP biodiversity datasets, as well as future research on changing marine metazoan biodiversity and community composition.

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Mesh size effects on assessments of planktonic hydrozoan abundance and assemblage structure

Cited by 14 publications

References 30 publications

A novel platform for monitoring gelatinous mesozooplankton: The high‐speed Gulf VII sampler quantifies gelatinous mesozooplankton similar to a ring net

A novel platform for monitoring gelatinous mesozooplankton: The high‐speed Gulf VII sampler quantifies gelatinous mesozooplankton similar to a ring net

Abundance, distribution and diversity of gelatinous predators along the northern Mid-Atlantic Ridge: A comparison of different sampling methodologies

Investigating pelagic biodiversity and gelatinous zooplankton communities in the rapidly changing European Arctic: An eDNA metabarcoding survey

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