Life cycle and reproductive traits of marine podonids (Cladocera, Onychopoda) in a coastal subtropical area

Miyashita, Leonardo Kenji; Gaeta, Salvador Airton; Lopes, Rubens M.

doi:10.1093/plankt/fbq147

Cited by 27 publications

(9 citation statements)

References 47 publications

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“…The effects of seasonal changes in temperature on optimum body sizes may, therefore, be easily confounded by other seasonally varying effects such as food, water, oxygen availability and mortality risks [18]. Nonetheless, seasonal body size variation commonly correlates strongly with changes in environmental temperature in a wide range of uni-and multicellular organisms, including bacteria [32], rotifers [33], copepods [34,35], cladocerans [36] and insects [37], examples of which are presented in electronic supplementary material, figure S1. Yet, despite the huge implications of environmental seasonality for global ecology, no broad exploration of seasonal size gradients has been performed to date.…”

Section: Introductionmentioning

confidence: 99%

Seasonal body size reductions with warming covary with major body size gradients in arthropod species

2017

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Major biological and biogeographical rules link body size variation with latitude or environmental temperature, and these rules are often studied in isolation. Within multivoltine species, seasonal temperature variation can cause substantial changes in adult body size, as subsequent generations experience different developmental conditions. Yet, unlike other size patterns, these common seasonal temperature-size gradients have never been collectively analysed. We undertake the largest analysis to date of seasonal temperature-size gradients in multivoltine arthropods, including 102 aquatic and terrestrial species from 71 global locations. Adult size declines in warmer seasons in 86% of the species examined. Aquatic species show approximately 2.5-fold greater reduction in size per °C of warming than terrestrial species, supporting the hypothesis that greater oxygen limitation in water than in air forces aquatic species to exhibit greater plasticity in body size with temperature. Total percentage change in size over the annual cycle appears relatively constant with annual temperature range but varies between environments, such that the overall size reduction in aquatic-developing species (approx. 31%) is almost threefold greater than in terrestrial species (approx. 11%). For the first time, we show that strong correlations exist between seasonal temperature-size gradients, laboratory responses and latitudinal-size clines, suggesting that these patterns share common drivers.

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Section: Introductionmentioning

confidence: 99%

Seasonal body size reductions with warming covary with major body size gradients in arthropod species

2017

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“…This is commonly linked to marked temporal shifts in adult body size over an annual cycle, as sequentially recruited adults are affected by different abiotic and biotic conditions over their ontogeny. Intraspecific variation in size related to seasonal variation in temperature has been found across a wide range of uni‐ and multicellular organisms, including bacteria (Chrzanowski et al ., ), rotifers (Diéguez et al ., ), copepods (Liang & Uye, ; Hirst et al ., ; Riccardi & Mariotto, ; Dutz et al ., ), cladocerans (Miyashita et al ., ) and insects (Kari & Huey, ), yet broad‐scale analyses of temporal changes in adult body size are lacking.…”

Section: Introductionmentioning

confidence: 99%

A global synthesis of seasonal temperature–size responses in copepods

Horne

Hirst

Atkinson

et al. 2016

Global Ecol. Biogeogr.

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Aim Body size is a master trait with significant ecological importance. Seasonal changes in body size within diverse ectothermic species can result from different environmental conditions experienced during ontogeny in subsequent generations. Whilst intraspecific changes in adult size have been well studied under controlled experimental conditions and across geographical ranges, comprehensive analyses of temporal changes are lacking, and there remains considerable unexplained variation in body size responses within aquatic taxa. Using planktonic copepods as an exemplar taxon, we quantify variation in adult body mass within seasonally varying marine and freshwater environments. We describe how size variation relates to temperature, food concentration (chlorophyll-a) and life-history characteristics, including feeding strategy.Location Global.Methods Using a meta-analytic approach we extract quantitative data from published literature on seasonal size responses of copepods. We analyse competing models to determine the best predictors of these responses, and compare the relative importance of temperature and chlorophyll-a concentration in explaining variation in body size. ResultsWe quantify 140 seasonal size responses from 33 different global locations, representing 48 planktonic copepod species from four taxonomic orders. We find that temperature (r 2 5 0.50), rather than food (r 2 5 0.22), is the dominant explanatory variable of changes in adult body size across seasons. A striking outcome is that calanoid copepods, which utilize feeding currents to capture prey, exhibit a four-fold greater reduction in adult body mass per 8C (23.66%) compared with cyclopoid copepods (20.91%), which are ambush feeders. By contrast, species body size or reproductive strategy did not explain variation in the seasonal temperature-size response.Main conclusions Our findings lead us to suggest that feeding strategies may play a significant role in dictating the magnitude of seasonal temperature-size responses in copepods, with potential implications for other ectotherms with diverse feeding methods. Seasonal temperature-size responses were typically much more variable than responses in laboratory studies that provided excess food, suggesting that field conditions modify the temperature-size response.

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“…; Miyashita et al . , ). SACW bottom intrusions affect the dynamics of the entire ecosystem off Southeastern Brazil (Pires‐Vanin et al .…”

Section: Introductionmentioning

confidence: 99%

Temporal changes in pelagic copepod assemblages off Ubatuba, Brazil

et al. 2016

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The inner shelf waters off Southeastern Brazil are periodically enriched by bottom intrusions of the cold and nutrient-rich South Atlantic Central Water (SACW), which is transported offshore by the Brazil Current. This study examined the temporal contrasts in abundance and structure of pelagic copepod assemblages in a neritic station off Ubatuba, in relation to hydrography and phytoplankton biomass, to investigate the effects of SACW bottom intrusions on copepod population dynamics during three consecutive years. The watercolumn characteristics shifted from a well-mixed, more turbid and phytoplankton-poor scenario during subsidence conditions to a stratified, less turbid and high Chl-a concentration scenario during SACW bottom intrusions, leading to increased copepod diversity, abundance, and biomass. The rise in copepod diversity during SACW intrusions was related to the contribution of oceanic species in addition to coastal water species. The copepod community was numerically dominated by small-sized species, such as Oncaea waldemari, Oithona plumifera, and clausocalanid and paracalanid copepodids, regardless of seasonality and SACW intrusions. Some large calanoid species contributed considerably to the total copepod biomass during intrusions. In addition to confirming that SACW seasonal intrusions play a key role in pelagic processes off Southeast Brazil, this study showed that the multiannual variability of SACW seasonal intrusions is important in regulating the structure and dynamics of copepod communities in this subtropical area.

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Life cycle and reproductive traits of marine podonids (Cladocera, Onychopoda) in a coastal subtropical area

Cited by 27 publications

References 47 publications

Seasonal body size reductions with warming covary with major body size gradients in arthropod species

Seasonal body size reductions with warming covary with major body size gradients in arthropod species

A global synthesis of seasonal temperature–size responses in copepods

Temporal changes in pelagic copepod assemblages off Ubatuba, Brazil

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