Relicts of a beautiful sea: survival, extinction, and conservation in a desert world

2015 ◽  
Vol 52 (08) ◽  
pp. 52-4214-52-4214
Keyword(s):  
Sea Survival

Survival rates of radio-collared female polar bears and their dependent young

1995 ◽  
Vol 73 (7) ◽  
pp. 1312-1322 ◽  
Author(s):  
S. C. Amstrup ◽  
G. M. Durner
Keyword(s):  
Adult Female ◽  
Survival Rates ◽  
Beaufort Sea ◽  
First Year ◽  
Human Populations ◽  
Polar Bears ◽  
Adult Males ◽  
Kaplan Meier ◽  
Second Year ◽  
Sea Survival

Polar bears (Ursus maritimus) are hunted throughout most of their range. In addition to hunting, polar bears of the Beaufort Sea region are exposed to mineral and hydrocarbon extraction and related human activities such as shipping, road building, and seismic testing. As human populations increase and demands for polar bears and other arctic resources escalate, reliable estimates of survivorship of polar bears are needed to predict and manage the impacts of those activities. We used the Kaplan–Meier model to estimate annual survival (with 95% confidence intervals) for radio-collared female polar bears and their dependent young that were followed during a 12-year study in the Alaskan Beaufort Sea. Survival of adult female polar bears was higher than had been previously thought: Ŝ = 0.969 (range 0.952–0.983). If human-caused mortalities were deleted, the computed survival rate was 0.996 (0.990–1.002). Survival of young from den exit to weaning was 0.676 (0.634–0.701). Survival during the second year of life, 0.860 (0.751–0.903), was substantially higher than during the first year, 0.651 (0.610–0.675). Shooting by local hunters accounted for 85% of the documented deaths of adult female polar bears. Conversely, 90% of documented losses of young accompanying radio-collared females were not directly caused by humans. Deaths of dependent young were independent of litter size (P = 0.36), indicating that parental investment in single cubs was not different from investment in litters of two or more. Precise estimates of the survival of independent juveniles and adult males still need to be developed.

Essentials of Sea Survival

2003 ◽  
Vol 89 (1) ◽  
pp. 56.1-56
Author(s):  
Nick Baldock
Keyword(s):  
Sea Survival

A Study on Suitability of Training Facilities and Equipment used on Seafarer’s Sea Survival Training

2017 ◽  
Vol 23 (5) ◽  
pp. 473-481
Author(s):  
Jin-Woo Lee ◽  
◽  
E-Wan Kim ◽  
Chang-Hee Lee ◽  
Young-Ho Lee
Keyword(s):  
Sea Survival

Condition-dependent skipped spawning in anadromous brown trout (Salmo trutta)

2018 ◽  
Vol 75 (12) ◽  
pp. 2313-2319 ◽  
Author(s):  
Tormod Haraldstad ◽  
Erik Höglund ◽  
Frode Kroglund ◽  
Anders Lamberg ◽  
Esben Moland Olsen ◽  
...  
Keyword(s):  
Salmo Trutta ◽  
Fitness Landscape ◽  
Regulated Rivers ◽  
Sea Trout ◽  
Skipped Spawning ◽  
Return Probability ◽  
Management Perspective ◽  
Brown Trout Salmo Trutta ◽  
Post Spawning ◽  
Sea Survival

Repeat spawners of anadromous salmonids may contribute significantly to population resilience by providing multiple cohorts to both seawater and freshwater life stages. In this study, winter survival of sea trout (Salmo trutta Linnaeus, 1758) post spawners (kelts) was 89%. Sea survival increased linearly with female length with a return probability between 30% and 50%, whereas males attained a maximum return probability of 60% at 520 mm. Of the returning sea trout, 40% skipped spawning and they had significantly lower condition factor as kelts compared with those who returned after one summer. These results suggest that sex-specific differences in individual post-spawning growth–survival trade-off exist and that energetic status of descending kelts may influence the probability to skip spawning. We discuss to what extent hydropower may reduce post-spawning survival due to blocking of river descent opportunities, potentially altering the fitness landscape and favouring new life-history adaptations. From a management perspective, it is concluded that it is crucial to maintain connectivity in regulated rivers, allowing fish to complete repetitive spawning and feeding migrations, thus contributing to population productivity.

Analysis of Growth of Atlantic Salmon (Salmo salar) in a Small Newfoundland River

1978 ◽  
Vol 35 (1) ◽  
pp. 60-68 ◽  
Author(s):  
E. M. P. Chadwick ◽  
T. R. Porter ◽  
P. Downton
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Survival Rates ◽  
River System ◽  
First Year ◽  
Commercial Fishery ◽  
Atlantic Salmon Salmo Salar ◽  
Dependent Relationship ◽  
Survival Density ◽  
Sea Survival

Growth and sea survival rates decreased with increasing smolt age, with survival being 12, 6, and 3% for 3+, 4+, and 5+ smolt, respectively. All spawning fish were grilse, which suggests that older smolt became large salmon and were thus more vulnerable to the commercial fishery. A density-dependent relationship was observed for 3+ smolt in their 1st yr of growth, but not for older smolt; younger smolt probably spend their juvenile life in a more productive but space-limiting part of the river. Variation between river-system environments may be responsible for the opposing results of studies on Atlantic salmon (Salmo salar) life history. Key words: Salmo salar, growth, sea survival, density dependence, first-year growth, age at smoltification

ANALISIS EFEKTIVITAS PROGRAM PELATIHAN SEA SURVIVAL PADA PT. BUMI LIPUTAN PUSAKA, BALIKPAPAN � KALIMANTAN TIMUR

2018 ◽  
Vol 4 (1) ◽  
pp. 22-35
Author(s):  
James James
Keyword(s):  
Sea Survival

Skripsi ini membahas tentang analisa efektivitas pelatihan yang di selenggarakan oleh PT. Bumi Liputan Pusaka. Metode yang digunakan dalam penelitian ini adalah CIPP (Context, Input, Proces, Product), merupakan penilitian kualitatif deskriptif atau observatif. Hasil penelitian ini memberikan gambaran tingkat efektivitas penyerapan materi pelatihan Sea Survival, dimana indikator efektivitas dapat dilihat melalui empat komponen, 1). komponen konteks yang berisi data diri, 2). komponen input yang terbagi atas komponen internal dan pretest, 3). komponen proses yang berisi evaluasi dari pelatih dan 4). komponen produk yang berisi hasil pretest Selain itu diberikan rekomendasi � rekomendasi sebagai bahan untuk perusahaan melakukan perbaikan agar efektivitas penyerapan materi pelatihan dapat di implementasikan.

scholarly journals Essentials of Sea Survival

2003 ◽  
Vol 14 (3) ◽  
pp. 209-210
Author(s):  
Michael Jacobs
Keyword(s):  
Sea Survival
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