Profundal benthic invertebrates in an oligotrophic tropical lake: different strategies for coping with anoxia

Hernández, María del Carmen; Alcocer, Javier; Oseguera, Luis A.; Escobar, Elva

doi:10.4081/jlimnol.2014.910

Cited by 19 publications

(17 citation statements)

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“…The original data presented in this study provide evidence of the plasticity observed for an endemic species which up to date has been found only in Lake Alchichica [ 36 ]. The hydrological cycles and the accompanying oscillations in the abiotic and biotic variables of Lake Alchichica have been widely documented for the last 20 years [ 30 , 61 ], so even though we analysed data from only one year, we judge our results reflect the response of the copepod population facing an average year. However, considering the subtle but apparently steady increase in water temperature observed the last years, it would be desirable to extend the survey to a longer period, as well as to include other species from neighbour waterbodies (in this lake, L .…”

Section: Discussionmentioning

confidence: 99%

Phenotypic plasticity of life-history traits of a calanoid copepod in a tropical lake: Is the magnitude of thermal plasticity related to thermal variability?

2018

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According to the Climatic Variability Hypothesis [CVH], thermal plasticity should be wider in organisms from temperate environments, but is unlikely to occur in tropical latitudes where temperature fluctuations are narrow. In copepods, food availability has been suggested as the main driver of phenotypic variability in adult size if the range of temperature change is less than 14°C. Leptodiaptomus garciai is a calanoid copepod inhabiting Lake Alchichica, a monomictic, tropical lake in Mexico that experiences regular, narrow temperature fluctuations but wide changes in phytoplankton availability. We investigated whether the seasonal fluctuations of temperature and food produce phenotypic variation in the life-history traits of this tropical species. We sampled L. garciai throughout a year and measured female size, egg size and number, and hatching success, along with temperature and phytoplankton biomass. The amplitude of the plastic responses was estimated with the Phenotypic Plasticity Index. This index was also computed for a published dataset of 84 copepod populations to look if there is a relationship between the amplitude of the phenotypic plasticity of adult size and seasonal change in temperature. The temperature annual range in Lake Alchichica was 3.2°C, whereas phytoplankton abundance varied 17-fold. A strong pattern of thermal plasticity in egg size and adult female size followed the inverse relationship with temperature commonly observed in temperate environments, although its adaptive value was not demonstrated. Egg number, relative reproductive effort and number of nauplii per female were clearly plastic to food availability, allowing organisms to increase their fitness. When comparing copepod species from different latitudes, we found that the magnitude of thermal plasticity of adult size is not related to the range of temperature variation; furthermore, thermal plasticity exists even in environments of limited temperature variation, where the response is more intense compared to temperate populations.

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Section: Discussionmentioning

confidence: 99%

Phenotypic plasticity of life-history traits of a calanoid copepod in a tropical lake: Is the magnitude of thermal plasticity related to thermal variability?

2018

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“…The deep benthic area of Lake Alchichica is stable (Tab. 1) with exception of the DO that is present only for four months (February-May), while the rest of the year the bottom water remains anoxic and H 2 S reaches up to 3.08 mg L -1 (Hernández et al, 2014). The substrate presented fine sediments with very high contents of organic matter, and carbonate.…”

Section: Resultsmentioning

confidence: 99%

“…However, as mentioned above, other species -but not Cletocamptus gomezi -are found along the slope at greater depths. Finally, at and below 50 m, only two species are found: an ostracod and a chironomid (Hernández et al, 2014). Both species are regulated by the long period (8 months) of anoxia and the presence of H 2 S at these depths.…”

Section: Discussionmentioning

confidence: 99%

“…The biovolume (nL) was transformed into preserved wet weight, dry weight and carbon using the conversion factors proposed by Gerlach (1971), Feller and Warwick (1988) and Giere (1993), respectively. Environmental water variables (temperature, pH, DO and salinity) and sediment (particle size, organic matter content, carbonate, vegetation coverage) were measured as described in Hernández et al (2010Hernández et al ( , 2014.…”

Section: Methodsmentioning

confidence: 99%

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On the ecology of Cletocamptus gomezi Suárez-Morales, Barrera-Moreno & Ciros-Pérez 2013 (Crustacea, Copepoda, Harpacticoida) micro-endemic to Lake Alchichica, Central Mexico

Alcocer¹,

Hernández²,

Oseguera³

et al. 2014

J Limnol

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“…Previous studies of benthic invertebrates in Lake Alchichica revealed the presence of ostracods in the littoral, sublittoral (Hernández et al, 2010) and profundal zones (Hernández et al, 2014). Among them, the recently described Limnocytherina axalapasco Cohuo-Durán, Pérez & Karanovic, 2014 was found in the shallow littoral area of Lake Alchichica (Cohuo-Durán et al, 2014).…”

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confidence: 97%

Candona alchichica (Podocopida: Candonidae), a new ostracod species from saline, tropical Lake Alchichica, Mexico

et al. 2016

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In North America, most species of the Candonidae family belong to the genus Candona. These species are frequently found in freshwater ecosystems and in sediment sequences, which makes them valuable tools for paleoenvironmental reconstructions. Knowledge of Mexican Candona species is limited, however, and scant information exists regarding their taxonomy and ecology. Here we describe Candona alchichica, a new ostracod species we suggest being endemic to Lake Alchichica, central Mexico. The species belongs to the acuminata group of species, based on the presence of 5+1 setae on the second segment of the mandibular palp. It is closely related to C. patzcuaro, C. tahoensis and C. ohioensis, but differs from those species in that the females have an elongated genital field, wide at the base and narrow at the end. Males have elongated hook-like prehensile palps and a particular arrangement of lobes in the hemipenis, i.e., the a-lobe is inclined with a digitiform basal projection, the b-lobe is distally rounded and the h-lobe is square-shaped and exceeding the length of the b-lobe. Candona alchichica n. sp. and C. patzcuaro display very similar shells in length and morphology, which can cause confusion if identification is carried out in the absence of soft parts, a common situation when dealing with carapace and valve remains in sediment cores. Detailed morphometric analyses, however, revealed a clear difference between the valves of the two taxa. Candona alchichica n. sp. has taller valves (p˂0.05), with concave dorsal margin, and with the anterior margin considerably narrower than posterior margin, all characteristics different from C. patzcuaro. Most important, in spite of their similar shape, the two species exhibit contrasting ecological preferences. Candona alchichica n. sp. inhabits clear, cold, saline, oligotrophic waters, whereas C. patzcuaro dwells in turbid, warm, fresh, eutrophic waters. In addition, we include a revision of the morphological characteristics and taxonomic position of C. patzcuaro, based on type material and specimens collected from the type locality (i.e., Lake Pátzcuaro, Michoacán). This study highlights the importance of undertaking detailed morphometric analyses of the recent ostracod fauna to provide reliable taxonomic identifications and ecological characterizations of species, which are critical for accurate paleoclimatic and paleoecological reconstructions.

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Profundal benthic invertebrates in an oligotrophic tropical lake: different strategies for coping with anoxia

Cited by 19 publications

References 77 publications

Phenotypic plasticity of life-history traits of a calanoid copepod in a tropical lake: Is the magnitude of thermal plasticity related to thermal variability?

Phenotypic plasticity of life-history traits of a calanoid copepod in a tropical lake: Is the magnitude of thermal plasticity related to thermal variability?

On the ecology of Cletocamptus gomezi Suárez-Morales, Barrera-Moreno & Ciros-Pérez 2013 (Crustacea, Copepoda, Harpacticoida) micro-endemic to Lake Alchichica, Central Mexico

Candona alchichica (Podocopida: Candonidae), a new ostracod species from saline, tropical Lake Alchichica, Mexico

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