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排序方式: 共有123条查询结果,搜索用时 15 毫秒
101.
Alexandros A. Karamanlidis Styliani Adamantopoulou Argyris A. Kallianiotis Eleni Tounta Panagiotis Dendrinos 《水产资源保护:海洋与淡水生态系统》2020,30(5):928-936
- Small‐scale fisheries may pose a serious threat to the conservation of marine mammals. At the same time various factors have led to the decline of small‐scale fisheries, often making them unsustainable. Current rates of biodiversity loss and the reduction of fish stocks and fisheries dictate a thorough understanding of fisheries‐related issues and the implementation of effective management actions.
- The Mediterranean monk seal is one of the most endangered marine mammals on Earth; its survival in the eastern Mediterranean Sea is threatened by negative interactions with fisheries. A nationwide questionnaire survey among fishers and port police authorities was carried out in Greece to describe the main characteristics of small‐scale fisheries, and to understand the nature and assess the magnitude of negative interactions between the monk seal and these fisheries. Questionnaire information was verified by a second round of interviews during landings.
- The main attributes of the fishers, their fishing boats, and their practices were characteristic of the small‐scale fisheries sector. Overfishing was considered the main reason for fish‐stock reduction, and negative interactions with marine mammals was considered the main issue for the fishing sector.
- Monk seals were present, caused damage, and got accidentally entangled in fishing gear throughout Greece. Damage to fishing gear was recorded mainly during spring and summer, and on average affected 21% of all fishing trips and 1% of nets deployed during a fishing trip.
- Based on these results, the implementation of general and specific nationwide fishery management and conservation actions are proposed. These actions are mainly aimed at improving fish stock status, changing the behaviour of the fishers, and mitigating seal–fishery interactions in Greece, while promoting the recovery of the Mediterranean monk seal in the eastern Mediterranean Sea.
102.
Giorgos Koumoundouros Savoula Kouttouki Eustathia Georgakopoulou Ioannis Papadakis Eric Maingot Panagiotis Kaspiris Yiannos Kiriakou Georgios Georgiou Pascal Divanach Maroudio Kentouri & Constantinos C Mylonas 《Aquaculture Research》2005,36(13):1265-1272
The ontogeny of shi drum Umbrina cirrosa (Linnaeus 1758), a candidate new species for aquaculture, was studied throughout the entire larval phase. Geometric morphometric analysis revealed two clear inflection points (7.0 and 12.7 mm total length, TL) in the shape ontogeny of this species, separating the studied period into three phases of different allometric priorities. Spline graphs demonstrated that the major non‐uniform shape ontogeny correlated with the development of the fins, the anterior dorsal area of the body, the caudal peduncle, the eye and the mouth. Concerning the morphological features, shi drum larvae are characterized by an upward anterior bending of the notochord. The ontogeny of the fins began with the formation of the pectoral buds (2.9 mm TL), continued with the notochord flexion (4.3 mm TL, associated with the caudal fin development), the appearance of the pelvic buds, the first anal rays (4.5 mm TL) and the first dorsal rays (4.8 mm TL). Shi drum juveniles presented 25 vertebrae and the following dominant fin types: D XI,23, AII,6, VI,5, P17 and C17. 相似文献
103.
Dimitrios Karagiannis Ioannis N. Vatsos Panagiotis Angelidis 《Aquaculture International》2011,19(1):103-110
Shellfish farming often takes place in areas subjected to various recurring pollutions. The intensive use of herbicides in
agriculture leads to the presence of residues in the aquatic ecosystems. In the present study, the effects of atrazine on
the viability of the mussel Mytilus galloprovincialis and the formation of their byssus were studied. A total of 720 mussels (mean length 24 mm ± 2.1 SD) were divided into six
groups. The mussels from the first five groups were exposed to five concentrations of atrazine, 10, 8, 5, 2 and 1 ppm, while
one group was used as control. The LC50 was calculated after 48 h, while the long-term effect of atrazine on the viability and byssus formation of the mussels were
studied for 21 days. The LC50 was found to be 6.33 ppm. From all the concentrations of atrazine to which the mussels were exposed, only in two of them
(2 and 1 ppm) some mussels survived up to the last day of the experiment. The survival rate in the control group was significantly
higher than those of mussels that were exposed to atrazine. Regarding the byssus formation, the number of byssal threads was
significant lower in the mussels that were exposed to 2 and 1 ppm atrazine compared to the control group, while no byssal
threads were formed by the mussels exposed to 10, 8 and 5 ppm. All the mussels that survived on day 21 were then exposed to
air. The LT50 for the control group and the mussels which had been exposed to 1 and 2 ppm atrazine were 5.14, 2.77 and 1.98 days, respectively.
The results of the present study indicate that atrazine has a significant effect on the viability of mussels both in the water
and in air and on their ability to form byssus. 相似文献
104.
Sakulchit WICHIANCHOT Nuttanan HONGSRICHAN Cherdsak MANEERUTTANARUNGROJ Somchai PINLAOR Kantapong IAMROD Andaman PURISARN Peerawich DONTHAISONG Panagiotis KARANIS Burin NIMSUPHAN Rucksak RUCKSAKEN 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2022,84(6):831
Canine monocytic ehrlichiosis caused by Ehrlichia canis infection is a life-threatening vector-borne disease in dogs worldwide. Routine blood smear has very low sensitivity and cannot accurately provide a quantitative result. Conventional PCR (cPCR) and real-time PCR (qPCR) are widely used as molecular methods for E. canis detection. qPCR is quantitative but relies on standard curves of known samples. To overcome this difficulty, this study developed a new E. canis quantitative detection method, using droplet digital polymerase chain reaction (ddPCR). ddPCR was evaluated against cPCR and blood smears. PCR amplicons and genomic DNA (gDNA) from 12 microscopic positive samples were used to identify the limits of detection (LODs) in ddPCR and cPCR. Our ddPCR was assessed in 92 field samples, it was compared with cPCR and blood smears. ddPCR showed LOD=1.6 copies/reaction, or 78 times more sensitive than cPCR (LOD=126 copies/reaction), using PCR amplicons as a template, whereas both ddPCR and cPCR had equal LODs at 0.02 ng gDNA/reaction. In addition, ddPCR had 100% sensitivity and 75% specificity for E. canis detection compared to cPCR and no cross-reaction with other blood pathogens was observed. ddPCR identified more positive samples than cPCR and blood smear. ddPCR improved the overall performance of E. canis detection, with a better LOD and comparable sensitivity and specificity to cPCR. The technique might be helpful for diagnosis of E. canis in light infection, evaluating the number of E. canis and follow-up after treatment. 相似文献
105.
COMPARISON OF COMPUTED TOMOGRAPHIC AND PATHOLOGIC FINDINGS IN 17 DOGS WITH PRIMARY ADRENAL NEOPLASIA 下载免费PDF全文
Tommaso Gregori Panagiotis Mantis Livia Benigni Simon L. Priestnall Christopher R. Lamb 《Veterinary radiology & ultrasound》2015,56(2):153-159
The CT appearance of canine adrenal masses has been reported, but associations between imaging features and pathologic features of these lesions have not been investigated in detail. The purpose of this study was to test associations between different types of adrenal neoplasia and their CT and pathologic features. A retrospective cross‐sectional study was performed and inclusion criteria were histologic diagnosis of primary adrenal neoplasia, contrast‐enhanced CT examination of the abdomen and surgical resection of the mass or necropsy examination. For all included dogs, CT images and histopathologic specimens were reviewed independently by two veterinary radiologists and a veterinary pathologist, respectively. Seventeen dogs met inclusion criteria. Diagnoses were adenocarcinoma in nine (53%) dogs, pheochromocytoma in five (29%) dogs, and adenoma in three (18%) dogs. Pheochromocytoma was associated with CT signs of vascular invasion (likelihood ratio = 4.8, 95% CI = 1.3–18.3, P = 0.03) and macroscopic vascular invasion (likelihood ratio = 9.6, 95% CI = 1.4–65.9, P = 0.02). There was excellent agreement between signs of vascular invasion in CT images and vascular invasion at surgery or necropsy (kappa = 0.86, P = 0.001). A peripheral contrast‐enhancing rim in delayed postcontrast CT images was associated with fibrous encapsulation of the tumor (kappa = 0.53, P = 0.05), and a heterogeneous pattern of contrast distribution in delayed postcontrast CT images was associated with adrenal hemorrhage or infarction on histological examination (kappa = 0.45, P = 0.05). Findings indicated that CT enabled assessment of adrenal neoplasia features that reflected their biological behavior and pathological findings, however overlapping characteristics between tumor types limited the potential for reliably distinguishing them based on CT alone. 相似文献
106.
Katsoulos PD Christodoulopoulos G Karatzia MA Pourliotis K Minas A 《Veterinary parasitology》2011,179(1-3):262-265
The main objective of this study was to investigate whether cholelithiasis in sheep is related to parasitism or other commonly observed disorders such as liver abscesses. Additionally, the features of the observed biliary calculi are described. The livers of 254 randomly selected clinically healthy adult dairy sheep were used. All visible concretions in the bile were considered as stones. Based on the macroscopical examination, 60 livers were normal, 40 were parasitized with Fasciola hepatica, 42 were parasitized with Dicrocoelium dendriticum, 28 were parasitized with both D. dendriticum and F. hepatica, 40 livers had abscesses and 44 had hydatid cysts. Biliary calculi were detected in 40 livers. Twenty livers had pigment stones and 20 livers had cholesterol stones. The percentage of cholelithiasis was significantly higher in livers parasitized with flukes compared with the others (P<0.05) and the parasitoses with F. hepatica and D. dendriticum were proven to be significant risk factors (P<0.05) for the presence of cholelithiasis in sheep. 相似文献
107.
108.
Panagiotis Besbeas Byron J. T. Morgan 《Journal of Agricultural, Biological & Environmental Statistics》2012,17(1):128-141
We demonstrate the potential of conditionally Gaussian state-space models in integrated population modeling, when certain
model parameters may be functions of previous observations. The approach is applied to a heron census, and the data are best
described by a model with three population-size thresholds which determine the population productivity. The model provides
an explanation of how the population rebounds rapidly after major falls in size, which are characteristic of the data. By
contrast, a simple logarithmic regression of productivity on population size was not significant. The results are of ecological
interest, and suggest hypotheses for further investigation. Supplementary figures are available online. 相似文献
109.
Brier M. Bostrom Panagiotis G. Xenoulis Shelley J. Newman Roy R. Pool Geoffrey T. Fosgate Jörg M. Steiner 《Veterinary journal (London, England : 1997)》2013,195(1):73-79
The objective of this study was to characterize the clinical, clinicopathological, and histopathological findings of dogs with chronic pancreatitis. The necropsy database at Texas A&M University was searched for reports of dogs with histological evidence of chronic pancreatitis defined as irreversible histologic changes of the pancreas (i.e. fibrosis or atrophy). A reference necropsy population of 100 randomly selected dogs was used for signalment and concurrent disease comparisons. Cases were categorized as clinical or incidental chronic pancreatitis based on the presence of vomiting, decreased appetite, or both vs. neither of these signs. All archived pancreas samples were scored histologically using a published scoring system.Sixty-one dogs with chronic pancreatitis were included. The most frequent clinical signs were lethargy, decreased appetite, vomiting, and diarrhea. Compared to the reference necropsy population, chronic pancreatitis cases were more likely to be older, neutered, of the non-sporting/toy breed group, and to have concurrent endocrine, hepatobiliary, or neurological disease. Clinical cases had significantly higher histological scores for pancreatic necrosis and peripancreatic fat necrosis, and were significantly more likely to have hepatobiliary or endocrine disease as well as increased liver enzyme activities, or elevated cholesterol and bilirubin concentrations. In conclusion, clinical disease resulting from chronic pancreatitis might be related to the presence of pancreatic necrosis and pancreatic fat necrosis. The signalment, presentation, and concurrent diseases of dogs with chronic pancreatitis are similar to those previously reported for dogs with acute pancreatitis. 相似文献
110.
Adrian Boswood Vet MB Christopher R. Lamb Vet MB Daniel J. Brockman BVSC Panagiotis Mantis DVM Angela L. Witt DVM 《Veterinary radiology & ultrasound》2003,44(1):53-55
A cat was diagnosed with nasopharyngeal stenosis on the basis of clinical signs, survey and contrast radiography, endoscopy and magnetic resonance imaging. The condition was successfully managed with repeated balloon dilatation. 相似文献