scholarly journals Recent Occurrence of Shortfin Mako Shark, Isurus oxyrinchus Rafinesque, 1810 (Chondrichthyes: Lamnidae), from the North-Eastern Mediterranean Coast of Turkey

2021 ◽  
Author(s):  
Deniz ERGÜDEN ◽  
Deniz AYAS ◽  
Hakan KABASAKAL
Keyword(s):  
Eastern Mediterranean ◽  
Mediterranean Coast ◽  
Mako Shark ◽  
The North ◽  
Isurus Oxyrinchus ◽  
Shortfin Mako ◽  
North Eastern ◽  
Recent Occurrence

Microsatellite analysis of population structure in the shortfin mako (Isurus oxyrinchus)

2003 ◽  
Vol 60 (6) ◽  
pp. 670-675 ◽  
Author(s):  
Aaron W Schrey ◽  
Edward J Heist
Keyword(s):  
Population Structure ◽  
Microsatellite Analysis ◽  
Population Subdivision ◽  
Mako Shark ◽  
The North ◽  
Isurus Oxyrinchus ◽  
Shortfin Mako ◽  
Weak Evidence ◽  
Female Dispersal ◽  
High Level

Microsatellite analysis of the shortfin mako shark (Isurus oxyrinchus) revealed very weak evidence of population structure. Samples collected from the North Atlantic, South Atlantic, North Pacific, South Pacific, and Atlantic, and Pacific coasts of South Africa were screened at four microsatellite loci. Multilocus measures of population subdivision were much lower than expected (FST = 0.0014, P = 0.1292; RST = 0.0029, P = 0.019). Power analysis revealed that the study had a high level of power (>0.995) to detect the magnitude of FST expected based on a previous study of mtDNA and assumptions of equal male and female dispersal. Thus, integrating the results from microsatellite- and mitochondrial-based studies may provide evidence for gender-biased dispersal for the shortfin mako.

Evaluating the impacts of uncertainty on the estimation of biological reference points for the shortfin mako shark, Isurus oxyrinchus, in the north-western Pacific Ocean

2011 ◽  
Vol 62 (12) ◽  
pp. 1383 ◽  
Author(s):  
Wen-Pei Tsai ◽  
Chi-Lu Sun ◽  
Sheng-Ping Wang ◽  
Kwang-Ming Liu
Keyword(s):  
Life History ◽  
Reference Points ◽  
Mako Shark ◽  
Stock Status ◽  
The North ◽  
Isurus Oxyrinchus ◽  
Length Relationship ◽  
Shortfin Mako ◽  
North Western ◽  
North Western Pacific

Biological reference points (BRPs) are commonly used to assess the harvest level and stock status of marine fish populations. However, BRP estimates may be influenced by uncertainties about life-history parameters and fishing practices. The shortfin mako shark, Isurus oxyrinchus, is one of the most important by-catch species for tuna longline fisheries; however, its stock status remains poorly understood. To understand its population dynamics, the present study examined fishery statistics data and biological measurements of the shortfin mako in the north-western Pacific, and evaluated the impact of uncertainties associated with various sources of uncertainty, by using a simulation approach. The simulations indicated that BRPs are especially sensitive to changes in weight–length relationship and the growth parameters. Failure to take this into account may lead to inaccurate estimates and have serious consequences for management decision-making. To improve the accuracy of BRP estimates, biological measurements and life-history parameters should be updated regularly to account for changes in size composition and population structure. Further research could focus on increasing the sex-ratio sample size, updating the weight–length relationship and growth equations, incorporating ageing error into BRP calculations and determining BRPs by using appropriate levels of spawning-potential ratio.

scholarly journals Biology of Shortfin Mako Shark (Isurus oxyrinchus Rafinesque, 1810) from the Eastern Mediterranean

2019 ◽  
pp. 424-431
Author(s):  
Elizabeth Grace Tunka Bengil ◽  
Meryem Akalın ◽  
İnci Tüney Kızılkaya ◽  
Fethi Bengil
Keyword(s):  
Eastern Mediterranean ◽  
Mako Shark ◽  
Isurus Oxyrinchus ◽  
Shortfin Mako

Age and growth of the common guitarfish, Rhinobatos rhinobatos, in Iskenderun Bay (north-eastern Mediterranean, Turkey)

2008 ◽  
Vol 88 (4) ◽  
pp. 837-842 ◽  
Author(s):  
Nuri Başusta ◽  
Sefa Ayhan Demirhan ◽  
Erdoğan Çiçek ◽  
Asiye Başusta ◽  
Tuncay Kuleli
Keyword(s):  
Eastern Mediterranean ◽  
Growth Curves ◽  
Mediterranean Coast ◽  
Age And Growth ◽  
Pooled Data ◽  
Total Length ◽  
The North ◽  
North Eastern ◽  
Iskenderun Bay ◽  
The Common

Age and growth of the common guitarfish (Rhinobatos rhinobatos) were estimated from the north-eastern Mediterranean coast of Turkey. A total of 115 common guitarfish (66 females and 49 males) were sampled. Age determinations were carried out using vertebral sections. Alcian blue dying techniques were used to enhance the visibility of the band on vertebrae. The techniques have been used for the first time on elasmobranchs vertebrae successfully in this study. A total of 97 vertebrae of 115 were visible on the vertebral band in this study. Male and female common guitarfish ranged in age from 1 to 15 and 1 to 24 y respectively. Total length ranged from 42 to 147 cm for females and 39 to 124 cm for males.The relationships between total length (TL) and total weight (TW) were presented as TW = 0.0014*TL3.1672 (R2 = 0.98) for females, TW = 0.0012*TL3.1947 (R2 = 0.98) for males and TW = 0.0012*TL3.1915 (R2 = 0.98) for both sexes. The parameters for von Bertalanffy growth curves were estimated as Linf  = 137.70±9.38 cm, K = 0.159±0.047, to = −2.180 ± 0.90 for pooled data.

Westward Palaearctic range expansion of Papilio demoleus Linnaeus, 1758 (Lepidoptera: Papilionidae) and its arrival at Mediterranean coastal regions of Turkey and Syria

2020 ◽  
Vol 71 (4) ◽  
pp. 257-272
Author(s):  
Onat Başbay ◽  
Mudar Salimeh ◽  
Eddie John
Keyword(s):  
Eastern Mediterranean ◽  
Economic Importance ◽  
Invasive Pest ◽  
Pest Species ◽  
Coastal Regions ◽  
The North ◽  
North Eastern ◽  
The World ◽  
Invasive Pest Species ◽  
Papilio Demoleus

We review the continuing and extensive spread of Papilio demoleus in south-eastern Turkey and in regions of Turkey and Syria adjacent to the north-eastern Mediterranean. Since the authors documented the arrival of this attractive but potentially destructive papilionid species at coastal areas of Syria in 2019, regular monitoring has confirmed successful overwintering there, as well as in Turkey. As previously indicated, P. demoleus is widely recognized as an invasive pest species in Citrus-growing areas of the world and hence its arrival is of potential economic importance to a region in which citrus is widely grown.

Coastal inundation in the north-eastern mediterranean coastal zone due to storm surge events

2010 ◽  
Vol 15 (3) ◽  
pp. 353-368 ◽  
Author(s):  
Yannis N. Krestenitis ◽  
Yannis S. Androulidakis ◽  
Yannis N. Kontos ◽  
George Georgakopoulos
Keyword(s):  
Storm Surge ◽  
Coastal Zone ◽  
Eastern Mediterranean ◽  
Coastal Inundation ◽  
The North ◽  
North Eastern

scholarly journals Spatiotemporal variation in size-structured populations using fishery data: an application to shortfin mako (Isurus oxyrinchus) in the Pacific Ocean

2017 ◽  
Vol 74 (11) ◽  
pp. 1765-1780 ◽  
Author(s):  
Mikihiko Kai ◽  
James T. Thorson ◽  
Kevin R. Piner ◽  
Mark N. Maunder
Keyword(s):  
Coastal Waters ◽  
Mixed Model ◽  
Linear Mixed Model ◽  
Marine Species ◽  
Structured Populations ◽  
Spatiotemporal Model ◽  
The North ◽  
Isurus Oxyrinchus ◽  
Shortfin Mako ◽  
Catch Rates

We develop a length-disaggregated, spatiotemporal, delta-generalized linear mixed model (GLMM) and apply the method to fishery-dependent catch rates of shortfin mako sharks (Isurus oxyrinchus) in the North Pacific. The spatiotemporal model may provide an improvement over conventional time-series and spatially stratified models by yielding more precise and biologically interpretable estimates of abundance. Including length data may provide additional information to better understand life history and habitat partitioning for marine species. Nominal catch rates were standardized using a GLMM framework with spatiotemporal and length composition data. The best-fitting model showed that most hotspots for “immature” shortfin mako occurred in the coastal waters of Japan, while hotspots for “subadult and adult” occurred in the offshore or coastal waters of Japan. We also found that size-specific catch rates provide an indication that there has been a recent increasing trend in stock abundance since 2008.

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