Preliminary acoustic tracking of native and transplanted European lobsters (Homarus gammarus) in an open sea lagoon

1997 ◽  
Vol 48 (8) ◽  
pp. 915 ◽  
Author(s):  
Gro I. van der Meeren
Keyword(s):  
Local Knowledge ◽  
Tracking System ◽  
Movement Patterns ◽  
Acoustic Signals ◽  
Migration Studies ◽  
Nocturnal Activity ◽  
Homarus Gammarus ◽  
Home Site ◽  
Open Sea ◽  
And Migration

In a larger release project, European lobsters (Homarus gammarus) under legal size have been captured, checked for magnetic microtags, externally tagged, and released to their home site for population and migration studies. To see if transplanted lobsters behave differently from native lobsters, four acoustically tagged males were released between three stationary hydrophones in an open sea lagoon and tracked continuously for 2–3 weeks. Lobster 1 was from the lagoon, Lobster 2 was transplanted less than 1000 m from its capture location, and Lobsters 3 and 4 were transplanted more than 5000 m. Within a few hours, Lobsters 1 and 2 took up residence in the area of their original home sites. Lobsters 3 and 4 took up residence in the lagoon after extended roaming. Six days after release, Lobsters 1 and 4 engaged in nocturnal activity, Lobster 2 changed locations occasionally without moving long distances, and Lobster 3 did not move. The odd movement patterns in the transplanted lobsters could be caused by their lack of local knowledge. Since rocks caused blocking of the acoustic signals, manual monitoring was needed to confirm the lobster positions. In cryptic animals such as lobsters, a continuous tracking system that can penetrate stones is required.

scholarly journals Summer movements of a radio-tagged Hoary Bat (Lasiurus cinereus) captured in southwestern Ontario

2019 ◽  
Vol 133 (2) ◽  
pp. 125 ◽  
Author(s):  
Derek Morningstar ◽  
Al Sandilands
Keyword(s):  
Wind Turbines ◽  
Adult Male ◽  
Tracking System ◽  
Movement Patterns ◽  
Wind Farms ◽  
Migratory Species ◽  
Lasiurus Cinereus ◽  
Wildlife Tracking ◽  
Hoary Bat ◽  
And Migration

Hoary Bat (Lasiurus cinereus) is a migratory species known to travel long distances during migration. Little is known about its movement patterns during other periods. An adult male Hoary Bat that we radio-tagged in southwestern Ontario in summer was tracked using the Motus Wildlife Tracking System. It travelled a minimum of 827 km in a circular route over a 2-week period and was last recorded 46 km from the original capture site. Hoary Bat is highly vulnerable to being killed at wind turbines and its propensity to travel great distances during summer and migration may exacerbate the impacts of wind farms.

Automated monitoring of a large-scale cod (Gadus morhua) migration in the open sea

2002 ◽  
Vol 59 (12) ◽  
pp. 1845-1850 ◽  
Author(s):  
Luc A Comeau ◽  
Steven E Campana ◽  
Martin Castonguay
Keyword(s):  
Large Scale ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Seasonal Migration ◽  
Migration Routes ◽  
Eastern Canada ◽  
Migration Patterns ◽  
Migration Timing ◽  
Open Sea ◽  
And Migration

The migration patterns of marine fishes are poorly known, in part owing to the technical limitations associated with tracking the movements of animals in deep water. Here we document a large-scale, directed, migration of Atlantic cod (Gadus morhua) off eastern Canada. Our approach was based on the acoustic tagging of 126 fish and the deployment of 69 subsurface receivers, stretching over a 160-km distance along the edge of the Laurentian Channel. After 1 year of automated recording, we found that 65% of the fish migrated out of coastal waters in two distinct runs during the summer–autumn period. The offshore-migrating fish overwintered in deep Laurentian Channel waters, returning inshore in April. Individual migration routes and migration timing were variable, indicating that the cod did not aggregate in large schools during the seasonal migration events.

scholarly journals Intersectional Discrimination: Definition, Scope, and Migration Research from the perspective of Intersectionality

2021 ◽  
Vol 9 (22) ◽  
Keyword(s):  
Culturally Diverse ◽  
Historical Background ◽  
Future Research ◽  
Migration Studies ◽  
Social Psychological ◽  
Migration Research ◽  
The Social ◽  
Conducting Research ◽  
And Gender ◽  
And Migration

Along with the widespread rise in immigration and the increase in the number of immigrants, academic interest in migration research has also grown. Although there are many studies conducted in various fields, the number of studies who approached migration from an intersectional perspective is rather small. The number of studies approaching migration and the social psychological processes of migrants from the perspective of intersectionality is even smaller in Turkey. Considering the large number of immigrants in Turkey, it is obviously essential to understand and study intersectionality in these particular contexts. Therefore, this article is written to explicate the concept of intersectionality and review migration studies adopting an intersectional approach. The basis of the concept of intersectionality, historical background that led to the birth of it, its subtypes as well as the importance of race, class and gender in intersectionality are among the issues discussed in this article. Moreover, with respect to migration studies from the perspective of intersectionality, studies conducted in various culturally diverse countries are outlined. The last but not the least, the prominence of conducting research on intersectionality in the Turkish context is also emphasized. In this review, we aim to present the literature to students and academics in the field as well as to provide direction for future research. Keywords: Migration, intersectionality, intersectional discrimination

Abundance and size of European lobsters (Homarus gammarus) and brown crabs (Cancer pagurus) inside and outside the Kåvra lobster reserve (west coast of Sweden)

Crustaceana ◽  
2020 ◽  
Vol 93 (2) ◽  
pp. 157-169
Author(s):  
Vidar Øresland ◽  
Gert Oxby ◽  
Fredrik Oxby
Keyword(s):  
Size Distribution ◽  
Relative Abundance ◽  
West Coast ◽  
Outer Part ◽  
Swedish West Coast ◽  
Offshore Area ◽  
Homarus Gammarus ◽  
Cancer Pagurus ◽  
And Migration ◽  
The Impact

Abstract The common method of using lobster-pot catch data for investigating relative abundance, sex and size distribution has serious disadvantages. This study estimates relative abundance and size of the European lobster Homarus gammarus and the brown crab Cancer pagurus using scuba diving techniques. The study areas were the Kåvra lobster reserve (Kåvra) on the Swedish west coast and three very different nearby areas where fishing for crustaceans is allowed: Gullmarsfjorden; the archipelago; and the offshore area. A total of 167 lobsters and 337 brown crabs were observed during 33 scuba dives (each 30 minutes long) in 2018-2019. The estimated mean abundance of lobsters was three to fifteen times as high at Kåvra in comparison with the other three areas (all exact showing that the statistical populations were distinct in comparison with Kåvra; Wilcoxon-Mann-Whitney Test). Dive sites in the outer part of the offshore area had the lowest abundance of lobsters although they had seemingly good lobster habitats and low fishing intensity. Large lobsters with a carapace length of ⩾15 cm were found only at Kåvra where they made up 24% of the lobsters. The proportion of large lobsters inside Kåvra continues to increase after 30 years of protection. Together, this emphasizes the impact of fishing on lobster abundance and size distribution, and indicates that limited recruitment and migration might possibly affect offshore lobster “sub populations”. Kåvra was the only area where the abundance of lobsters exceeded the abundance of brown crabs (). However, the abundance of brown crabs at Kåvra was as low as in Gullmarsfjorden () where fishing for crabs is allowed. Possible complex lobster/brown crab interactions together with other factors that might explain the low abundance of the protected brown crab at Kåvra, need to be investigated further.

scholarly journals Migration, mobility and the dynamics of kinship: New barriers, new assemblages

Ethnography ◽  
2020 ◽  
Vol 21 (3) ◽  
pp. 299-318 ◽  
Author(s):  
Apostolos Andrikopoulos ◽  
Jan Willem Duyvendak
Keyword(s):  
State Politics ◽  
Special Issue ◽  
Migration Studies ◽  
Close Attention ◽  
Dynamic Character ◽  
Migration Research ◽  
Kinship Relations ◽  
And Migration

Although kinship has long since been established as a topic in migration research, migration scholars often lacked an analytical concept of kinship and relied on their own ethnocentric understandings and legal definitions. Reconciling insights from the anthropology of kinship and migration studies, we outline how a new theorization of kinship could be suitable and helpful for the study of migration and mobility. First, we need a conceptualization that accounts for kinship’s flexible and dynamic character in changing settings. Second, it is imperative to pay close attention to the intricate ways kinship interrelates with state politics. Lastly, an analytical notion of kinship should take into account that kinship relations can also have negative implications for the persons concerned. Articles in this Special Issue are attentive to these caveats and approach through the prism of kinship different issues of migration and mobility.

scholarly journals Does Animal Personality Affect Movement in Habitat Corridors? Experiments with Common Voles (Microtus arvalis) Using Different Corridor Widths

Animals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 291 ◽  
Author(s):  
Gabriele Joanna Kowalski ◽  
Volker Grimm ◽  
Antje Herde ◽  
Anja Guenther ◽  
Jana A. Eccard
Keyword(s):  
Tracking System ◽  
Movement Patterns ◽  
Animal Personality ◽  
Very High Frequency ◽  
Behavioral Traits ◽  
Site Characteristics ◽  
Habitat Corridors ◽  
Personality Score ◽  
Common Voles ◽  
Very High

Animal personality may affect an animal’s mobility in a given landscape, influencing its propensity to take risks in an unknown environment. We investigated the mobility of translocated common voles in two corridor systems 60 m in length and differing in width (1 m and 3 m). Voles were behaviorally phenotyped in repeated open field and barrier tests. Observed behavioral traits were highly repeatable and described by a continuous personality score. Subsequently, animals were tracked via an automated very high frequency (VHF) telemetry radio tracking system to monitor their movement patterns in the corridor system. Although personality did not explain movement patterns, corridor width determined the amount of time spent in the habitat corridor. Voles in the narrow corridor system entered the corridor faster and spent less time in the corridor than animals in the wide corridor. Thus, landscape features seem to affect movement patterns more strongly than personality. Meanwhile, site characteristics, such as corridor width, could prove to be highly important when designing corridors for conservation, with narrow corridors facilitating faster movement through landscapes than wider corridors.

Influences on movement and migration in the hermit crab Pagurus bernhardus

1990 ◽  
Vol 70 (3) ◽  
pp. 483-491 ◽  
Author(s):  
I. Lancaster ◽  
G.D. Wigham
Keyword(s):  
Population Dynamics ◽  
Hermit Crab ◽  
Movement Patterns ◽  
Hermit Crabs ◽  
Residence Times ◽  
South West ◽  
Pagurus Bernhardus ◽  
And Migration ◽  
South West England

Dispersion in a littoral population of Pagurus bernhardus in south-west England is shown to be random, with members demonstrating no evidence of site attachment. Movement patterns within the population are shown to be asynchronous and random, and to be dictated by the quantity and quality of each individual's shell contacts. These, in turn, affect the time that individuals spend within the habitat. This implies that population dynamics and residence times are so influenced by the availability of suitable empty gastropod shells that movement and migration in hermit crabs should be regarded as resource-dependent phenomena.

Sign in / Sign up

Export Citation Format

Share Document