Comparison of the effects of two bongo net mesh sizes on the estimation of abundance and size of Engraulidae eggs

Favero, Jana Menegassi del; Katsuragawa, Mario; Zani-Teixeira, Maria de Lourdes; Turner, Jefferson T.

doi:10.1590/s1679-87592015081206302

Cited by 7 publications

(4 citation statements)

References 30 publications

(36 reference statements)

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“…The difference in the mesh-size probability of false zeros was only significant in the egg binomial part of the ZI model, being higher for the 0.505 mm mesh size in all areas. This result agrees with Favero et al (2015b), who showed that the FO of E. anchoita eggs was higher in the 0.333 mm than the 0.505 mm mesh-size net. It is also important to note in Fig.…”

Section: Biological and Oceanographic Factorssupporting

confidence: 92%

Modeling long-term fluctuations in the distribution and abundance of Engraulis anchoita eggs and larvae in the southeastern Brazilian bight

Favero¹,

Katsuragawa²,

Zani-Teixeira³

et al. 2018

Mar. Ecol. Prog. Ser.

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Most data sets of ichthyoplankton contain a high frequency of zeros, and, not considering the possible inflation of zero counts, as in most studies, may result in incorrect model predictions. Thus, we modeled abundance of Engraulis anchoita eggs and larvae sampled during 18 oceanographic cruises conducted between 1974 and 2010 using zero-inflated (ZI) models. ZI models are mixture models with 2 components: (1) containing false zeros (due to design, survey or observer errors) modeled using a binomial generalized linear model (GLM); (2) containing abundance data that may produce zeros (true zeros), and modeled with a negative binomial GLM (ZINB). Although ZINB has been used in other areas of research, we are not aware of its previous use for ichthyoplankton. Common to larvae and eggs, the probability of false zeros was lowest in the southern area of the southeastern Brazilian Bight and higher at deeper station depths. The probability of false zeros was higher in 0.505 mm mesh-size samples than in 0.333 mm mesh only for eggs. Egg and larval abundance was negatively related to temperature in the count portion of the model; only larval abundance was negatively related to salinity. Egg abundance was higher in years sampled with 0.333 mm mesh under conditions of moderate/strong El Niño. The high interannual variability in the abundance and distribution of eggs emphasizes the importance of longterm studies to better understand patterns of fluctuations in the occurrence of ichthyoplankton that are related to environmental conditions.

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Section: Biological and Oceanographic Factorssupporting

confidence: 92%

Modeling long-term fluctuations in the distribution and abundance of Engraulis anchoita eggs and larvae in the southeastern Brazilian bight

Favero¹,

Katsuragawa²,

Zani-Teixeira³

et al. 2018

Mar. Ecol. Prog. Ser.

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show abstract

“…Although not the focus of this study, it is worthy to note that filtration rate may influence RE. This effect has been demonstrated with organism collection in relation to plankton tow speed (e.g., Hays, 1994;Colton et al, 1980) and fish egg collection efficiency as a function of the ratio of filtration to the mouth area of a net (Favero et al, 2015). For this study, the filtered volumes (20 L) of ambient organisms filtered through monofilament mesh are representative of the sample volumes that would be manageable as ballast water was collected during shipboard operations to determine a vessel's compliance with the discharge standard.…”

Section: -µMmentioning

confidence: 83%

Caught in a net: Retention efficiency of microplankton ≥ 10 and < 50 μm collected on mesh netting

Molina

Robbins-Wamsley

Riley

et al. 2018

Journal of Sea Research

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Living organisms ≥ 10 μm and < 50 μm in ballast water discharged from ships are typically collected by filtering samples through a monofilament mesh net with pore openings sized to retain organisms ≥ 10 μm. This (or any) filtering method does not result in perfect size fractionation, and it can induce stress, mortality, and loss of organisms that, in turn, may underestimate the concentration of organisms within samples. To address this loss, the retention efficiency (RE) was determined for six filtration approaches using laboratory cultures of microalgae and ambient marine organisms. The approaches employed a membrane filter or mesh nettings of different compositions (nylon, stainless steel, polyester, and polycarbonate), nominal pore sizes (5, 7, and 10 μm), and filtering sequences (e.g., pre-filtering water through a coarse filter). Additionally, in trials with polycarbonate track etched (PCTE) membrane filters, water was amended with particulate material to increase turbidity. Organisms ≥ 10 μm were counted in the material retained on the filter (the filtrand), the material passing through the filter (the filtrate), and the whole water (i.e., unfiltered water). In addition, variable fluorescence fluorometry was used to gauge the relative photochemical yield of phytoplankton-a proximal measurement of the physiological status of phytoplankton-in the size fractions. Further, the mesh types and filters were examined using scanning electron microscopy, which showed irregular openings. The RE of cultured organisms-calculated as the concentration in the filtrand relative to combined concentration in the filtrand and the filtrate-was high for all filtration approaches when laboratory cultures were assessed (> 93%), but RE ranged from 66 to 98% when mixed assemblages of ambient organisms were evaluated. Although PCTE membrane filters had the highest RE (98%), it was not significantly higher than the efficiencies of the 7-μm polyester, Double 7-μm polyester, and Dual 35-μm and 7-μm polyester approaches, but it was significantly higher than the 5-μm nylon and 5-μm stainless steel techniques. This result suggests that PCTE membrane filters perform comparably to 7-μm polyester meshes, so that any of these approaches could be used for concentrating organisms. However, the potential for handling loss is inherently lower for one rinsing step rather than two. Therefore, it is recommended that, either PCTE filters or 7-μm polyester mesh could be used to concentrate organisms ≥ 10 μm and < 50 μm. In trials conducted using a 10-μm PCTE filters with water amended to increase the particulate concentration, no significant difference in RE of ambient organisms was found compared to unamended water. Finally, photochemical yield did not vary significantly between organisms in the filtrand or filtrate, regardless of the filtration approach used.

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“…V.1) (e.g. ASANO et al, 1991;MATSUURA et al, 1992;CASTELLO;CASTELLO, 2003;FAVERO et al, 2015a;2015b).…”

Section: Long-term Fluctuations In Theunclassified

“…WEISS; FEIJÓ DE SOUZA, 1977;CASTELLO, 1994;VASCONCELLOS et al, 1998;VELASCO;CASTELLO, 2005;VAZ et al, 2007;COOKE;MADUREIRA, 2012;TORQUATO;COSTA et al, 2016) and even fewer from the SBB (e.g. NAKATANI, 1982;ASANO et al, 1991;MATSUURA et al, 1992;CASTELLO;CASTELLO, 2003;FAVERO et al, 2015a;2015b).…”

Section: General Introductionmentioning

confidence: 99%

<i>Engraulis anchoita</i> (Clupeiformes: Engraulidae) eggs and larvae in the Southeastern Brazilian Bight: new perspectives from a historical data set (1974 - 2010)

Favero¹

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First of all I would like to thank both of my advisors, Prof. Mario Katsuragawa (IOUSP) and Prof. Jefferson T. Turner (SMAST-UMASS), for all of the support offered throughout these years. You both were so kind for sharing your knowledge with me, patient with all of my corrections, and very helpful in dealing with the bureaucracies involved in the double degree program. I would like also to thank my "third" advisor, the IOUSP technician Maria de Lourdes Zani-Teixeira, who sometimes was a second mother, helping not just with the research, but also with personal problems. I am extremely thankful to FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo), for funding my research project in Brazil (n° 2011/23332-3) and in the USA (n° 2014/00365-1). I thank the professors from USP and UMASS, for the great lectures, courses, and conversations, especially Prof. June Ferraz Dias (IOUSP), for being more than a professor, but also a friend, always ready to answer any question (professional or not!). Special thanks also to Prof. Ilson Carlos Almeida da Silveira (IOUSP) and Prof. Avijit Gangopadhyay (SMAST), for making the dual degree program possible and for helping me every time I had a problem or a doubt. It is impossible to cite all of the names here, but I thank all IOUSP and SMAST staff. The absence of your help would have made my work much harder.

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Comparison of the effects of two bongo net mesh sizes on the estimation of abundance and size of Engraulidae eggs

Cited by 7 publications

References 30 publications

Modeling long-term fluctuations in the distribution and abundance of Engraulis anchoita eggs and larvae in the southeastern Brazilian bight

Modeling long-term fluctuations in the distribution and abundance of Engraulis anchoita eggs and larvae in the southeastern Brazilian bight

Caught in a net: Retention efficiency of microplankton ≥ 10 and < 50 μm collected on mesh netting

<i>Engraulis anchoita</i> (Clupeiformes: Engraulidae) eggs and larvae in the Southeastern Brazilian Bight: new perspectives from a historical data set (1974 - 2010)

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