Size at the onset of maturity (SOM) revealed in length–weight relationships of brackish amphipods and isopods: An information theory approach

Longo, Emanuela; Mancinelli, Giorgio

doi:10.1016/j.ecss.2013.11.013

Cited by 20 publications

(19 citation statements)

References 61 publications

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“…In addition, following Mancinelli (2010), Longo & Mancinelli (2014), and Mancinelli & Pasquali (2016), individual TP values of blue crabs were regressed against the respective carapace widths (expressed as log-transformed mm CW) by least squares using a simple linear, or, alternatively, a quadratic polynomial model. Model comparisons were carried out adopting a parsimonious procedure (Burnham & Anderson, 2002) based on the second-order Akaike Information Criterion AICc (Sugiura, 1978, after Akaike, 1974.…”

Section: Statistical Analysesmentioning

confidence: 99%

The trophic position of the Atlantic blue crab Callinectes sapidus Rathbun 1896 in the food web of Parila Lagoon (South Eastern Adriatic, Croatia): a first assessment using stable isotopes.

et al. 2016

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The Atlantic blue crab Callinectes sapidus is to date widely distributed in the Mediterranean Sea, where is recognized as an Invasive Alien Species. Noticeably, while records of its occurrence are increasing, quantitative information on its functional role in the benthic food webs of invaded coastal habitats are scarce.Here, carbon and nitrogen isotopic signatures were measured in C. sapidus and other representative taxa of the benthic flora and fauna sampled in summer in the Parila Lagoon, a coastal basin located in the Neretva River estuary area (Croatia). d15N values of individual blue crab specimens were used to calculate their trophic position (TP) , using the filter feeder mussel Mytilus galloprovincialis as the isotopic baseline. In general, the isotopic signature of C. sapidus was comparable with those characterizing invertebrate and fish predators (e.g., Hexaplex trunculus, Gobius niger). An average trophic position of 3.73 was estimated for the blue crab population. However, a considerable inter-individual variation was observed in TP values, significantly related with the size of the specimens. Interestingly, a hump-shaped quadratic polynomial resulted the best fitting model for the data, characterized for small-size individuals by a positive body size-TP relationship, leveling or even turning negative for larger adult crabs. The interplay between environmental factors and ontogenetic diet shifts in determining the trophic position of the blue crab and, ultimately, its ecological impact on the benthic community of the Parila Lagoon is discussed.

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Section: Statistical Analysesmentioning

confidence: 99%

The trophic position of the Atlantic blue crab Callinectes sapidus Rathbun 1896 in the food web of Parila Lagoon (South Eastern Adriatic, Croatia): a first assessment using stable isotopes.

et al. 2016

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“…With K = number of models. The model showing the highest w i was accepted as the best candidate; other candidate models were accepted if characterized by w i values within 12.5% of the highest [55][56][57]. The model building and MAM identification procedures were performed while adopting Fox and Weisberg [58] as a general reference.…”

Section: Discussionmentioning

confidence: 99%

Species Richness and Taxonomic Distinctness of Zooplankton in Ponds and Small Lakes from Albania and North Macedonia: The Role of Bioclimatic Factors

Mancinelli

Mali

Belmonte

2019

Water

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Resolving the contribution to biodiversity patterns of regional-scale environmental drivers is, to date, essential in the implementation of effective conservation strategies. Here, we assessed the species richness S and taxonomic distinctness Δ+ (used a proxy of phylogenetic diversity) of crustacean zooplankton assemblages from 40 ponds and small lakes located in Albania and North Macedonia and tested whether they could be predicted by waterbodies’ landscape characteristics (area, perimeter, and altitude), together with local bioclimatic conditions that were derived from Wordclim and MODIS databases. The results showed that a minimum adequate model, including the positive effects of non-arboreal vegetation cover and temperature seasonality, together with the negative influence of the mean temperature of the wettest quarter, effectively predicted assemblages’ variation in species richness. In contrast, taxonomic distinctness did not predictably respond to landscape or bioclimatic factors. Noticeably, waterbodies’ area showed a generally low prediction power for both S and Δ+. Additionally, an in-depth analysis of assemblages’ species composition indicated the occurrence of two distinct groups of waterbodies characterized by different species and different precipitation and temperature regimes. Our findings indicated that the classical species-area relationship hypothesis is inadequate in explaining the diversity of crustacean zooplankton assemblages characterizing the waterbodies under analysis. In contrast, local bioclimatic factors might affect the species richness and composition, but not their phylogenetic diversity, the latter likely to be influenced by long-term adaptation mechanisms.

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“…When required, post hoc comparisons of means were performed using Tukey HSD tests. Following Mancinelli et al (2005) and Longo and Mancinelli (2014), movement metrics were regressed against individual body size (expressed as mg DM) by least squares using a simple linear (SL hereafter), or, alternatively, a piece-wise linear model with a single breakpoint (SLR). Regressions were performed using the iterative procedure implemented in the segmented R package (Muggeo 2008).…”

Section: Discussionmentioning

confidence: 99%

“…95 % confidence intervals of model parameters reported in brackets resource distribution and patchiness, ultimately inducing a shift in movement behaviour and search strategies. The connection between crucial metabolic changes occurring at the onset of maturity and variations in movement behaviour has been a posteriori demonstrated in isopods of the genus Lekanesphaera (Mancinelli 2010;Longo and Mancinelli 2014). In contrast, studies on the metabolic activity of L. arcticus are in general scant (Scholander et al 1953;Lakka 2013), and sexual maturity-related variations are virtually unexplored.…”

Section: Discussionmentioning

confidence: 99%

Body size-related constraints on the movement behaviour of the arctic notostracan Lepidurus arcticus (Pallas, 1973) under laboratory conditions

Mancinelli

Pasquali

2016

Rend. Fis. Acc. Lincei

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The movement behaviour of individuals has long been acknowledged as a key determinant of species distribution in space and time. Information on benthic macroinvertebrates from aquatic habitats are still scant, however, and for polar species are virtually nonexistent. Here, the influence of body size on the movement behaviour of the arctic notostracan Lepidurus arcticus (Pallas) was examined under resource-free laboratory conditions. The mean step length, total path length and average speed were determined for specimens varying in body dry mass by six orders of magnitude. The scale-independent fractal dimension D was used to quantify movement path tortuosity. Among the different movement metrics considered, the body size of specimens scaled significantly only with path tortuosity; specifically, a negative relationship with a breakpoint was observed between individual body masses and the D values of the respective movement paths. The results are discussed considering similar results obtained for benthic crustaceans from temperate habitats. Additionally, their implications for future investigations explicitly considering temperature effects on movement behaviour are briefly considered. Keywords Arctic tadpole shrimp Á Locomotor activity Á Individual differences Á Fractal dimension This peer-reviewed article is a result of the multi and interdisciplinary research activities based at the Arctic Station ''Dirigibile Italia'', coordinated by the ''Dipartimento Scienze del Sistema Terra e Tecnologie per l'Ambiente'' of the National Council of Research of Italy.

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Size at the onset of maturity (SOM) revealed in length–weight relationships of brackish amphipods and isopods: An information theory approach

Cited by 20 publications

References 61 publications

The trophic position of the Atlantic blue crab Callinectes sapidus Rathbun 1896 in the food web of Parila Lagoon (South Eastern Adriatic, Croatia): a first assessment using stable isotopes.

The trophic position of the Atlantic blue crab Callinectes sapidus Rathbun 1896 in the food web of Parila Lagoon (South Eastern Adriatic, Croatia): a first assessment using stable isotopes.

Species Richness and Taxonomic Distinctness of Zooplankton in Ponds and Small Lakes from Albania and North Macedonia: The Role of Bioclimatic Factors

Body size-related constraints on the movement behaviour of the arctic notostracan Lepidurus arcticus (Pallas, 1973) under laboratory conditions

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