scholarly journals Extensive Use of Intertidal Habitat by Shorebirds Outside Protected Nesting Areas

2020 ◽  
Vol 84 (7) ◽  
pp. 1338-1347
Author(s):  
Julia D. Monk ◽  
Eunbi Kwon ◽  
Audrey Derose‐Wilson ◽  
Samantha G. Robinson ◽  
Henrietta A. Bellman ◽  
...  
Keyword(s):  
Intertidal Habitat

Design of experimental food patches to measure foraging intensity for octopus: a case study with the giant Pacific octopus Enteroctopus dofleini

2020 ◽  
Author(s):  
Stephanie Chancellor ◽  
David Scheel ◽  
Joel S Brown
Keyword(s):  
Predation Risk ◽  
Foraging Behaviour ◽  
Habitat Preferences ◽  
High Tide ◽  
Intertidal Habitat ◽  
Camera System ◽  
Subtidal Habitat ◽  
Enteroctopus Dofleini ◽  
Nontarget Species

ABSTRACT In a study of the foraging behaviour of the giant Pacific octopus Enteroctopus dofleini, we designed two types of experimental food patches to measure habitat preferences and perceptions of predation risk. The first patch successfully measured giving-up densities (GUDs), confirmed by octopus prey presence and higher foraging at sites with historically greater octopus presence. However, nontarget foragers also foraged on these experimental food patches. Our second floating patch design successfully excluded nontarget species from subtidal patches, and from intertidal patches at high tide, but allowed for foraging by E. dofleini. The second design successfully measured GUDs and suggested that octopus preferred foraging in a subtidal habitat compared to an intertidal habitat. We ascribe the higher GUD in the intertidal habitat to its higher predation risk relative to the subtidal habitat. The second patch design seems well suited for E. dofleini and, in conjunction with a camera system, could be used to provide behavioural indicators of the octopus's abundance, perceptions of habitat quality and predation risk.

Experimental studies of herbivory and algal competition in a low intertidal habitat

Oecologia ◽  
1985 ◽  
Vol 67 (2) ◽  
pp. 183-191 ◽  
Author(s):  
David O. Duggins ◽  
Megan N. Dethier
Keyword(s):  
Experimental Studies ◽  
Intertidal Habitat ◽  
Algal Competition

scholarly journals Unusually low genetic divergence at COI barcode locus between two species of intertidalThalassaphorura(Collembola: Onychiuridae)

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5021 ◽  
Author(s):  
Xin Sun ◽  
Anne Bedos ◽  
Louis Deharveng
Keyword(s):  
Genetic Divergence ◽  
Dna Barcode ◽  
Intertidal Habitat ◽  
Species Classification ◽  
Arthropod Species ◽  
Fresh Material ◽  
Interspecific Divergence ◽  
Collembolan Species ◽  
Morphological Differences ◽  
Intertidal Ecosystems

Species classification is challenging when taxa display limited morphological differences. In this paper, we combined morphology and DNA barcode data to investigate the complicated taxonomy of two Onychiurid Collembolan species.Thalassaphorura thalassophilaandThalassaphorura debilisare among the most common arthropod species in intertidal ecosystems and are often considered to be synonymous. Based on morphological and barcode analyses of fresh material collected in their type localities, we redescribed and compared the two species. However, their morphological distinctiveness was supported by a molecular divergence much smaller than previously reported at the interspecific level among Collembola. This divergence was even smaller than inter-population divergences recognized in the related edaphic speciesT. zschokkei, as well as those known between MOTUs within many Collembolan species. Our results may indicate a link between low genetic interspecific divergence and intertidal habitat, as the only biological peculiarity of the two species of interest compared to other Collembolan species analyzed to date is their strict intertidal life.

The comparative ecology and evidence for resource partitioning in two pholidid fishes (Pisces: Pholididae) from southern British Columbia eelgrass beds

1985 ◽  
Vol 63 (1) ◽  
pp. 76-85 ◽  
Author(s):  
Grant W. Hughes
Keyword(s):  
British Columbia ◽  
Activity Patterns ◽  
Prey Type ◽  
Microhabitat Use ◽  
Similar Species ◽  
Intertidal Habitat ◽  
Comparative Ecology ◽  
Saanich Inlet ◽  
Breeding Habitats ◽  
Eelgrass Beds

A comparative analysis of the ecology of sympatrically occurring Pholis laeta and Pholis ornata was conducted in Saanich Inlet, British Columbia. Summer microhabitat use of eelgrass bed depths, intertidal habitat use, prey type, and characteristic location of prey taken differed in fish older than 1 year and may have facilitated the coexistence of these morphologically similar species. Prey sizes and activity patterns were similar between species. Winter segregation of the species during the breeding season may have reduced the possibility of hybridization. Competition for breeding habitats and differences in trophic apparatus may partly explain the observed patterns of resource use.

scholarly journals Quantifying temporal trends in anthropogenic litter in a rocky intertidal habitat

2020 ◽  
Vol 160 ◽  
pp. 111543 ◽  
Author(s):  
Eleanor A. Weideman ◽  
Vonica Perold ◽  
Aaniyah Omardien ◽  
Lucy K. Smyth ◽  
Peter G. Ryan
Keyword(s):  
Temporal Trends ◽  
Rocky Intertidal ◽  
Intertidal Habitat
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