Spatial and Temporal Variation of the Freshwater Mussel<i>Dreissena blanci</i>(Westerlund, 1890) Larvae in Greek Lakes

Chalkia, Ekaterini; Kehayias, George; Doulka, Evangelia

doi:10.4002/040.055.0109

Cited by 5 publications

(3 citation statements)

References 25 publications

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“…The larvae of the bivalve Dreissena blanci were the most important prey of A. boyeri in Lake Trichonis, as it was also reported by Chrisafi et al (2007), although Doulka et al (2013) found this taxon second in abundance. It should be noted, that according to recent investigations (Chalkia et al 2012), Dreissena blanci had been misidentified as Dreissena polymorpha in both of these previous reports. The calanoid copepod Eudiaptomus drieschi, which dominates the zooplankton community in Lake Trichonis (Doulka and Kehayias 2008), was the most important prey of Table 1 The number of prey items (n) and the frequency of occurrence (F) of the prey categories found in the stomach contents of Atherina boyeri specimens caught around the two lamp rafts in Lake Trichonis, Greece (The respective values in June came from samples taken only around TR)…”

Section: Discussionmentioning

confidence: 90%

Fish predation in the proximity of purse seine fishing lights: The case of Atherina boyeri (Actinopterygii: Atheriniformes: Atherinidae) in a Greek Lake

Kehayias¹,

Tzavali²,

Gini³

et al. 2018

Acta Ichthyol. Piscat.

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Kehayias G., Tzavali A., Gini M., Michopoulou E., Tsounis L. 2018. Fish predation in the proximity of purse seine fishing lights: The case of Atherina boyeri (Actinopterygii: Atheriniformes: Atherinidae) in a Greek Lake. Acta Ichthyol. Piscat. 48 (1): 51-60.Background. Purse seining with the use of light is among the most common fishing practices around the world, but there is lack of studies on the effect of light on the feeding of the target species in this kind of fishery and the possible consequences for other prey species. The presently reported investigation intended to provide indications on this issue by studying the diet of Atherina boyeri Risso, 1810, which is the target species of professional purse seine fishery, conducted using light in Lake Trichonis (Greece), and by comparing the acquired results with those of previous studies where the samples were taken without using light. Materials and methods.A seven-month (June through December 2014) purse seining fishing was conducted at night around two lamp rafts: 1) a traditional lamp raft producing white LED light and 2) an autonomous photovoltaic-battery-LED lamp raft producing green LED light. Stomach content analysis was conducted on 100 randomly selected specimens from each sample and the relative prey abundance and frequency of occurrence for each prey category was estimated. Calculations of predation pressure of A. boyeri upon the fish larvae of a goby, Economidichthys trichonis Economidis et Miller, 1990, were performed. Results. The study revealed the intense effect of light on the attraction and capture of prey species rarely found in previous studies, such as the larvae of the native and endangered fish E. trichonis, amphipods, and copepod nauplii. No significant differences were observed between the two light colours. A preference shift to larger prey with the increase of ontogenetic stage of A. boyeri was observed. Several thousands of pre-recruited E. trichonis larvae may be preyed upon each night around a single lamp especially during summer. Conclusion. Fishing with light may alter the dietary preference of the target fish species and even of the entire fish community. This may have serious consequences on the younger ontogenetic stages of other fish populations, especially when it coincides with their reproductive period. Considering the lack of similar field studies, the present results may stimulate analogous investigations on the effects of fishing lights in other marine and freshwater ecosystems worldwide.

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Section: Discussionmentioning

confidence: 90%

Fish predation in the proximity of purse seine fishing lights: The case of Atherina boyeri (Actinopterygii: Atheriniformes: Atherinidae) in a Greek Lake

Kehayias¹,

Tzavali²,

Gini³

et al. 2018

Acta Ichthyol. Piscat.

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“…Their near absence from Lake Lysimachia may be due to the lake's muddy bottom substrate (Chalkia et al 2012b).…”

Section: Zooplankton Species Composition and Variabilitymentioning

confidence: 99%

Zooplankton and environmental factors of a recovering eutrophic lake (Lysimachia Lake, Western Greece)

Chalkia¹,

Kehayias²

2013

Biologia

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The present study investigates the zooplankton community dynamics and the abiotic environment in the eutrophic Lake Lysimachia (western Greece). The lake is considered to be recovering from eutrophication after the termination of an urban sewage inflow in 2000, and its waters are replenished constantly from the nearby oligotrophic Lake Trichonis. The results show that, although a decrease in nutrient concentrations was observed compared to the past, the lake still has eutrophic characteristics. This was reflected in the zooplankton community which is typical of those found in eutrophic lakes where rotifers prevail. Similarities among this lake and other nearby lakes were found considering the zooplankton community composition and seasonal variation. However, Lake Lysimachia is inhabited also by a number of different and even unique species (e.g., Moina micrura), suggesting that this ecosystem may be an important biodiversity refuge. Most of the zooplankton species were correlated with water temperature and, to a lesser extent, eutrophication key-water quality variables. Although there are few available data on the zooplankton of the lake, the abundance and composition of the community presenting characteristics indicative of intermediate trophic conditions and suggesting that the lake is probably under a kind of "biological" recovery.

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“…D. orghidani is expected to have been affected by temperature as a thermophilous species (Korovchinsky, 1992), while its high density among cladocerans seems to have been responsible for the affection of temperature to the whole cladoceran community. Additionally, temperature seemed to be the most important abiotic factor controlling the seasonal variation of D. blanci larvae, as it was also reported from other lakes in the area (Chalkia et al, 2012b). In addition, the positive correlation between temperature and the sister dreissenid species D. polymorpha has been found in other Greek lakes (Michaloudi et al, 1997), as well as in lakes of northern Europe (Stańczykowska & Lewandowski, 1993).…”

Section: Influence Of Physicochemical Parametersmentioning

confidence: 51%

Zooplankton community dynamics and environmental factors in Lake Ozeros (Greece)

Chalkia

Kehayias

2013

Medit. Mar. Sci.

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A one-year investigation of the zooplankton community composition and dynamics in Lake Οzeros (western Greece) revealed 25 invertebrate species (16 rotifers, three copepods, five cladocerans and one mollusc larva). The mean zooplankton abundance fluctuated between 59.4 to 818 ind l -1 , with maximum values in spring. The species composition and seasonal variation do not differentiate Lake Ozeros from the nearby lakes. The presence of the dominant calanoid copepod Eudiaptomus drieschi and some of the rotifer species recorded are characteristic of either oligo-or eutrophic lakes. According to the trophic state index (TSI), Lake Ozeros is a meso-eutrophic ecosystem, in which the eutrophic character is possibly the result of the high phosphorus load (being 28.9% higher in comparison to previous decades), which is due to the surrounding agricultural cultivations and mainly the pig-raising activities. In contrast, the concentrations of ΝΟ 3 , ΝΟ 2 and NH 4 have considerably decreased possibly due to the termination of tobacco cultivations around the lake during the last years. The novel information on the abiotic and especially the biotic elements of Lake Ozeros provided by this study can contribute to the effective management of this aquatic ecosystem in the future.

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Spatial and Temporal Variation of the Freshwater MusselDreissena blanci(Westerlund, 1890) Larvae in Greek Lakes

Cited by 5 publications

References 25 publications

Fish predation in the proximity of purse seine fishing lights: The case of Atherina boyeri (Actinopterygii: Atheriniformes: Atherinidae) in a Greek Lake

Fish predation in the proximity of purse seine fishing lights: The case of Atherina boyeri (Actinopterygii: Atheriniformes: Atherinidae) in a Greek Lake

Zooplankton and environmental factors of a recovering eutrophic lake (Lysimachia Lake, Western Greece)

Zooplankton community dynamics and environmental factors in Lake Ozeros (Greece)

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