The ecology of freshwater bivalves in the Lake Sapanca basin, Turkey

Ercan, Ertan; Gaygusuz, Özcan; Tarkan, Ali Serhan; Reichard, Martin; Smith, Carl

doi:10.3906/zoo-1212-23

Cited by 22 publications

(15 citation statements)

References 29 publications

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“…Elsewhere, a typical lifespan of U . crassus in Bohemia is 10 years (Douda, ), and as short as 7 years in the Marmara region of Turkey (Ercan et al ., ). These estimates suggest a positive relationship between longevity and latitude for U .…”

Section: Introductionmentioning

confidence: 97%

“…A clear pattern can be seen in asymptotic growth of shell lengths at approximately 90, 70, and 50–100 mm for U . crassus populations in Marmara, Bohemia, and Bavaria, respectively (Hochwald, ; Douda, ; Ercan et al ., ). Compared with maximum estimates of age and size, the evaluation of biogeographical trends in growth rate is more difficult because many different numerical approaches have been used in the past to define U .…”

Section: Introductionmentioning

confidence: 97%

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Growth characteristics of the endangered thick‐shelled river mussel (Unio crassus) near the northern limit of its natural range

Helama

Valovirta

Nielsen³

2016

Aquatic Conservation

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1. The thick-shelled river mussel, Unio crassus (Bivalvia: Unionoida), is one of Europe's most-threatened mussels. Finnish populations of U. crassus lie close to the northern limit of its natural distribution. Extirpation of these populations will reduce the range of this endangered species.2. Growth characteristics of U. crassus were measured in a river running through the Helsinki metropolitan area. Shell dimensions (size-at-age data) and annual shell growth increments were used to reconstruct growth rate and its variation during the lifespan of individual mussels and to investigate the relationship between growth rate and longevity (age-at-death).3. Reconstructed growth rates compared well with size-at-age data conventionally used to study individual growth in natural populations, and fitted von Bertalanffy growth functions very well. Based on the same function, reconstruction and size-at-age methods resulted in similar estimates of growth rate. 4. Shell weight explained the body size more reliably than age, suggesting that growth rate varied significantly among individuals. Comparison of individual growth histories revealed a negative correlation between age-atdeath and growth rate, i.e. slow-growing mussels lived longer, and vice versa.5. In comparison with populations from central and southern Europe, U. crassus populations in the north of its range grew more slowly but lived longer, a phenomenon most likely explained by latitudinal changes in ambient temperature.6. Although northern populations are expected to benefit from a relatively high number of reproductive periods and lower juvenile mortality, the individuals studied here died earlier and suffered higher mortality than expected and an elevated conservative status is identified. Any management programme should take into account the lifehistory traits essential to the recognition of management units of U. crassus.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

Growth characteristics of the endangered thick‐shelled river mussel (Unio crassus) near the northern limit of its natural range

Helama

Valovirta

Nielsen³

2016

Aquatic Conservation

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“…In studies on U. crassus, the maximum shell length was reported as 66.9 mm in the Wkra River (Poland) [31]), 67.4 mm in the Palakaria River (Bulgaria) [32], 81 mm in Bohemia (Czech Republic) [30], 83 mm in Estonia [9], 85.4 mm in the Vantaa River (Finland) [33], and 95 mm in the Susa River (Denmark) [34]. During this study, which was done in Çine Creek, the largest length was measured as 92.50 mm, while another study conducted in Sapanca Lake on the west coast of Turkey reported that U. crassus were found with lengths of 74 mm [35]. When all these studies are taken into consideration, it is seen that the mussel measured in Çine Creek has the longest length except for the Susa River.…”

Section: Discussionmentioning

confidence: 82%

Determining Bioecological and Biometric Properties of Freshwater Mussels (Unio crassus Philipsson, 1788)

Serdar¹,

Bulut²,

Eden³

et al. 2019

Pol. J. Environ. Stud.

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Population characteristics of Unio crassus, an endangered freshwater mussel in many countries, are very important. In this study, we have attempted to determine the environmental conditions of Aydın-Çine Creek and the biometric properties of U.crassus. The largest length during the study period was 92.50 mm in February, and the smallest length was 37.03 mm in April. In addition, the heaviest individual was found to be 124.15 g in February, while the smallest individual was 6.69 g in April. It was found that 141 individuals were found in a group of 70.0-79.99 mm at maximum in the distribution frequency of U.crassus in Çine Creek. The water temperature was measured at 9.8-24.0ºC, and oxygen value was 6.0-10.4 mg/L during the study. In the current environmental conditions in Çine Creek, various sizes and population development of U.crassus have been identified.

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“…Ercan et al [20] reported the freshwater mussel fauna of Turkey has hitherto received little attention. Five native mussel species belonging to 3 genera were encountered in surveys: Anodonta cygnea, A. anatina, Unio pictorum, U. crassus, and Dreissena polymorpha.…”

Section: Discussionmentioning

confidence: 99%

Diversity of Molluscan communities in Kondakarla Freshwater Lake, Visakhapatnam, Andhra Pradesh

Amaravathi¹,

Sekhar²,

K³

2019

SSR-IIJLS

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Background: Kondakarla Lake is the second largest natural fresh water lake in Andhra Pradesh, India located at a distance of 42 km from Visakhapatnam. The molluscan faunal diversity was investigated during the study period from July 2012 to June 2014. The study aimed to keep records mainly on the taxonomy, distribution, status, and conservation need of the different species. Methods: Samples were collected with the help of local people by using Peterson's grab sampler, Surber and D-Frame. The collected samples were washed and preserved in plastic screw cap bottles and preserved in 70 -80% ethyl alcohol and in 5% formalin solution. Results: Altogether 14 species of these 28.57% of class Bivalvia and 71.429% of Gastropoda were recorded at four selected stations. Order Mesogastropoda dominant with 2 families which contributed to 50% of the total population followed by Trigoinoida and Bsommatophora each contributed to 25%. The number and Percentage composition of Population Status were recorded during the study period. The recorded range of various diversity indexes were noted at different seasons. Conclusion: Kondakarla freshwater lake consisting of 28.571% of class Bivalvia and 71.429% of gastropoda was recorded at four stations during the study period. The Population Status was 07.143% abundant, 57.143% species were common, 21.429% species were moderate and 14.286% species were rare in the total catch.

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The ecology of freshwater bivalves in the Lake Sapanca basin, Turkey

Cited by 22 publications

References 29 publications

Growth characteristics of the endangered thick‐shelled river mussel (Unio crassus) near the northern limit of its natural range

Growth characteristics of the endangered thick‐shelled river mussel (Unio crassus) near the northern limit of its natural range

Determining Bioecological and Biometric Properties of Freshwater Mussels (Unio crassus Philipsson, 1788)

Diversity of Molluscan communities in Kondakarla Freshwater Lake, Visakhapatnam, Andhra Pradesh

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