Dataset Information

Plagiotheciumschofieldii, a new species from the Aleutian Islands (Alaska, USA).

ABSTRACT: Plagiotheciumschofieldii sp. nov. is described from the Aleutian Islands, Alaska, U.S.A. Some morphological features of this species correspond to P.lamprostachys (Southern Hemisphere species); however, Plagiotheciumschofieldii is genetically and morphologically different from this and other common Northern Hemisphere species e.g., P.denticulatum, P.platyphyllum, or P.ruthei. The most important distinguishing morphological features differentiating this species are: the arrangement of the leaves on the stem; dimensions, concavity and symmetry of the leaves; dimensions of cells and their areolation; orientation of capsules. Additionally, due to the strong concavity of the leaves, they are very often badly damaged under the microscope. We present the results of DNA research of the analyzed samples, and a detailed description of the morphological features. The new species is illustrated, and its ecological preferences and currently known geographical distribution are presented. Additionally, the authors propose to add this species to Plagiothecium section, which is confirmed by morphological features and genetic analysis.

SUBMITTER: Wolski GJ

PROVIDER: S-EPMC8589775 | biostudies-literature | 2021

REPOSITORIES: biostudies-literature

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Plagiotheciumschofieldii, a new species from the Aleutian Islands (Alaska, USA).

Wolski Grzegorz J GJ Nowicka-Krawczyk Paulina P Buck William R WR

PhytoKeys 20211105

Plagiotheciumschofieldii sp. nov. is described from the Aleutian Islands, Alaska, U.S.A. Some morphological features of this species correspond to P.lamprostachys (Southern Hemisphere species); however, Plagiotheciumschofieldii is genetically and morphologically different from this and other common Northern Hemisphere species e.g., P.denticulatum, P.platyphyllum, or P.ruthei. The most important distinguishing morphological features differentiating ...[more]

PMID: 34785976

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Project description:Sperm whales exhibit sexual dimorphism and sex-specific latitudinal segregation. Females and their young form social groups and are usually found in temperate and tropical latitudes, while males forage at higher latitudes. Historical whaling data and rare sightings of social groups in high latitude regions of the North Pacific, such as the Gulf of Alaska (GOA) and Bering Sea/Aleutian Islands (BSAI), suggest a more complex distribution than previously understood. Sperm whales are the most sighted and recorded cetacean in marine mammal surveys in these regions but capturing their demographic composition and habitat use has proven challenging. This study detects sperm whale presence using passive acoustic data from seven sites in the GOA and BSAI from 2010 to 2019. Differences in click characteristics between males and females (i.e., inter-click and inter-pulse interval) was used as a proxy for animal size/sex to derive time series of animal detections. Generalized additive models with generalized estimation equations demonstrate how spatiotemporal patterns differ between the sexes. Social groups were present at all recording sites with the largest relative proportion at two seamount sites in the GOA and an island site in the BSAI. We found that the seasonal patterns of presence varied for the sexes and between the sites. Male presence was highest in the summer and lowest in the winter, conversely, social group peak presence was in the winter for the BSAI and in the spring for the GOA region, with the lowest presence in the summer months. This study demonstrates that social groups are not restricted to lower latitudes and capture their present-day habitat use in the North Pacific. It highlights that sperm whale distribution is more complex than accounted for in management protocol and underscores the need for improved understanding of sperm whale demographic composition to better understand the impacts of increasing anthropogenic threats, particularly climate change.

Dataset Information

Plagiotheciumschofieldii, a new species from the Aleutian Islands (Alaska, USA).

Publications

<i>Plagiotheciumschofieldii</i>, a new species from the Aleutian Islands (Alaska, USA).

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