Spatial distribution, size composition, feeding habits, and dynamics of abundance of Alaska skate Bathyraja parmifera in the North Pacific

Grigorov, Igor V.; Орлов, А. М.; Baitalyuk, A. A.

doi:10.1134/s0032945215050069

Cited by 13 publications

(5 citation statements)

References 5 publications

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“…According to our data, the maximum condition factor for the western Bering Sea was 4.4, while 95% of the individuals from all study areas had a condition factor < 1%. For the Aleutian skate, Alaska skate B. parmifera , Okhotsk skate B. violacea , and Pacific sleeper shark Somniosus pacificus , a general trend of increased condition factor in the autumn–winter period and a decrease in its value by the summer has been revealed [ 71 , 72 , 73 ], as well as in this study, which may be due to similar ecological and biological conditions of these species (ecological niche, biotopes, migrations, etc.). This trend indicates a feeding migration in the spring–summer from greater to shallower depths, and in the autumn–winter in the opposite direction.…”

Section: Discussionsupporting

confidence: 68%

The Aleutians and Beyond: Distribution, Size Composition, and Catch Dynamics of the Aleutian Skate Bathyraja aleutica across the North Pacific

Grigorov¹,

Кивва

Орлов

2022

Animals

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The results of long-term (1948–2021) studies on the spatial and vertical distribution, dynamics of abundance, and size composition of the Aleutian skate Bathyraja aleutica in the North Pacific Ocean are presented. Maximum densities of this species were characteristic of the eastern Bering Sea slope, off the central Aleutian Islands, consisting of the Pacific waters off southeastern Kamchatka and the northern Kurils, and northeastern Sakhalin. This species was most abundant at depths of 100–600 m; in the cold months, B. aleutica migrates to greater depths for over-wintering, and in warm months it feeds at shallower depths. Bathyraja aleutica was most common at the bottom, at temperatures around 3 °C. The total length of individuals ranged from 9.6–170 cm, with a predominance of skates with a length of 50–100 cm. Males did not differ significantly from females in body weight and length. The maximum values of the condition factor were typical for the autumn–winter period. Across years, there was an increase in Aleutian skate catch rates from the western Bering Sea and the Sea of Okhotsk, and a decrease in the Pacific waters off the Kuril Islands and Kamchatka, as well as in Alaskan waters.

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Section: Discussionsupporting

confidence: 68%

The Aleutians and Beyond: Distribution, Size Composition, and Catch Dynamics of the Aleutian Skate Bathyraja aleutica across the North Pacific

Grigorov¹,

Кивва

Орлов

2022

Animals

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“…Diet in other skate species has been shown to drive variation in depth use (Grigorov et al, 2015;Simpson et al, 2019). The diet of flapper skate is not well studied, but they are thought to feed predominantly on crustaceans and teleost fish (Dulvy et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

Seasonal and Ontogenetic Variation in Depth Use by a Critically Endangered Benthic Elasmobranch and Its Implications for Spatial Management

et al. 2021

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Seasonal and ontogenetic variations in depth use by benthic species are often concomitant with changes in their spatial distribution. This has implications for the efficacy of spatial conservation measures such as marine protected areas (MPAs). The critically endangered flapper skate (Dipturus intermedius) is the designation feature of an MPA in Scotland. This species is generally associated with deeper waters >100 m; however, little is known about its seasonal or ontogenetic variation in habitat use. This study used archival depth data from 25 immature and mature flapper skate tagged in the MPA over multiple years. Time series ranged from 3 to 772 (mean = 246) days. Generalised additive mixed models and highest density intervals were used to identify home (95%) and core (50%) highest density depth regions (HDDRs) to quantify depth use in relation to time of year and body size. Skate used a total depth range of 1–312 m, but home HDDRs typically occurred between 20 and 225 m. Core HDDRs displayed significant seasonal and ontogenetic variations. Summer core HDDRs (100–150 m) suggest high occupancy of the deep trenches in the region by skate of most size classes. There was an inverse relationship between body size and depth use and a seasonal trend of skate moving into shallow water over winter months. These results suggest that flapper skate are not solely associated with deep water, as skate, especially large females, are frequently found in shallow waters (25–75 m). The current management, which protects the entire depth range, is appropriate for the protection of flapper skate through much of its life history. This research demonstrates why collecting data across seasonal scales and multiple ontogenetic stages is needed to assess the effectiveness of spatial management.

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“…Species encountered less than 100 times are not included in the list. B. parmifera and Bathyraja smirnovi were also excluded from it, since until recently, information about the distribution of these two morphologically similar species was very contradictory [ 27 , 32 , 38 , 39 , 40 , 41 , 42 , 43 , 44 ]; as a result, research teams confused them with each other. Thus, nine of the most common species were identified, which became the objects of this study ( Table 1 ).…”

Section: Methodsmentioning

confidence: 99%

“…To date, there is published information about the general features of the spatial distribution and dynamics of catches of the most common and some rare species in the Pacific waters off the North Kuril Islands and southeastern Kamchatka [ 17 , 29 , 30 , 31 ]. Recently, data on the spatial distribution and dynamics of catches of Alaska skate Bathyraja parmifera , Okhotsk skate Bathyraja violacea and Aleutian skate Bathyraja aleutica throughout the North Pacific have also been described [ 32 , 33 , 34 ]. Additionally, there is information on the distribution and biology of the bottom skate Bathyraja bergi in the Russian waters of the Sea of Japan [ 35 ].…”

Section: Introductionmentioning

confidence: 99%

Long-Term Changes in the Distribution and Abundance of Nine Deep-Water Skates (Arhynchobatidae: Rajiformes: Chondrichthyes) in the Northwestern Pacific

Орлов

Volvenko²

2022

Animals

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Based on the analysis of long-term data from bottom trawl surveys (1977–2021), changes in the spatial distribution, position of the boundaries of the ranges and the catch rates of the nine most common deep-sea skates of the genus Bathyraja in the Russian waters of the Northwestern Pacific (B. violacea, B. aleutica, B. matsubarai, B. maculata, B. bergi, B. taranetzi, B. minispinosa, B. interrupta, and B. isotrachys) are considered. During the surveyed period, significant changes in the spatial distribution were observed, which are probably due to both subjective reasons (changes in the number of trawling stations, surveyed depths, etc.) and climatic changes. No monotonous displacement of the northern or southern boundaries of the range or its center in one direction was observed in any area of any species during the entire observation period. At the same time, shifts in the boundaries of the ranges of different species in different areas occurred for different decades, i.e., the boundaries of the ranges slowly fluctuated or “pulsed” near some average annual position. In general, from the 1970s to the 1980s, the number of skates grew; from the 1980s to the 1990s, it decreased; from the 1990s to the 2000s, it fluctuated at the achieved level; from the 2000s to the 2010s, it grew again; and from the 2010s to the 2020s, it decreased again. These trends coincide with previously identified ecosystem rearrangements under the influence of climatic and oceanological changes. The identification of links between changes in spatial distribution, range boundaries and catch rates with climatic and oceanological factors require separate additional studies.

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Spatial distribution, size composition, feeding habits, and dynamics of abundance of Alaska skate Bathyraja parmifera in the North Pacific

Cited by 13 publications

References 5 publications

The Aleutians and Beyond: Distribution, Size Composition, and Catch Dynamics of the Aleutian Skate Bathyraja aleutica across the North Pacific

The Aleutians and Beyond: Distribution, Size Composition, and Catch Dynamics of the Aleutian Skate Bathyraja aleutica across the North Pacific

Seasonal and Ontogenetic Variation in Depth Use by a Critically Endangered Benthic Elasmobranch and Its Implications for Spatial Management

Long-Term Changes in the Distribution and Abundance of Nine Deep-Water Skates (Arhynchobatidae: Rajiformes: Chondrichthyes) in the Northwestern Pacific

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