Evidence for interaction between the seagrasses Zostera marina and Zostera japonica on the Pacific coast of Canada

1991 ◽  
Vol 69 (9) ◽  
pp. 2004-2010 ◽  
Author(s):  
Kathy M. Nomme ◽  
Paul G. Harrison
Keyword(s):  
Zostera Marina ◽  
Pacific Coast ◽  
Morphological Characters ◽  
Zostera Japonica ◽  
Factors Affecting ◽  
The Pacific ◽  
Shallow Subtidal ◽  
Clear Plastic ◽  
Abiotic And Biotic Factors ◽  
Manipulation Experiment

Experiments were undertaken to differentiate between abiotic and biotic factors affecting seagrass growth. Monospecific patches of both Zostera marina and Zostera japonica were transplanted into one shallow subtidal and three intertidal sites at Roberts Bank, British Columbia. In transplanted patches, initiated in 1988, neither Z. marina nor Z. japonica showed any consistent differences in either population growth or mean shoot length among the sites. Abiotic environmental conditions could therefore not be considered responsible for the differences observed between the natural vegetation of the respective monospecific zones and the zone of naturally mixed seagrass vegetation. In a manipulation experiment, opaque and clear plastic seagrass canopies were imposed on Z. japonica vegetation and the resulting growth was compared with treatments of a natural Z. marina canopy and removal of the natural canopy. The artificial seagrasses combined with the patch layout of the experiment did not create the shade conditions intended and may have facilitated the loss of shoots. The results were not conclusive, but there were consistently higher densities of Z. japonica in the treatment where Z. marina had been removed. Interactions between these two seagrasses in their vegetative phase may contribute to the observed differences in population and morphological characters, but the dispersal and establishment phases remain to be studied. Key words: Zostera marina, Zostera japonica, seagrass, competition, transplants, artificial seagrass.

scholarly journals Phylogenetic placement of enigmatic Astianthus (Bignoniaceae) based on molecular data, wood and bark anatomy

2021 ◽  
Vol 99 (2) ◽  
pp. 398-412
Author(s):  
Marcelo R. Pace ◽  
Brenda Hernández-Hernández ◽  
Esteban M. Martínez Salas ◽  
Lúcia G. Lohmann ◽  
N. Ivalu Cacho
Keyword(s):  
Pacific Coast ◽  
Phylogenetic Analyses ◽  
Morphological Characters ◽  
Molecular Data ◽  
Phylogenetic Placement ◽  
The Pacific ◽  
Molecular Phylogenetic ◽  
Phloem Fibers ◽  
Plastid Markers ◽  
Bark Anatomy

Background: Astianthus is a monospecific arborescent genus of Bignoniaceae that occur in the Pacific Coast of central Mexico and northern Central America, where it grows in dense populations along riversides. Its phylogenetic placement has remained controversial since Astianthus has unusual morphological characters such as a four-loculed ovary, and simple, pulvinate, verticillate leaves. Methods: Here we used three plastid markers ndhF, rbcL, and trnL-F, wood, and bark anatomical data to investigate the phylogenetic placement of Astianthus and assign it to one of Bignoniaceae’s main clades. Results: Our molecular phylogenetic analyses indicated that Astianthus belongs in tribe Tecomeae s.s., where other charismatic Neotropical Bignoniaceae genera such as Campsis and Tecoma are currently placed. Wood and bark anatomy support this placement, as Astianthus reunites a unique combination of features only known from members of Tecomeae s.s., such as storied axial parenchyma, the co-occurrence of homo- and heterocellular rays, septate fibers, and scattered phloem fibers in the bark. Conclusions: The placement of Astianthus within Tecomeae s.s. provides further support to previous proposals for the Neotropical origin of this Pantropical tribe.

A new species of Cyclolejeunea (Marchantiophyta: Lejeuneaceae) from the Chocó, Colombia

2017 ◽  
Vol 39 (1) ◽  
pp. 21 ◽  
Author(s):  
S. ROBBERT GRADSTEIN ◽  
M. ELENA REINER-DREHWALD
Keyword(s):  
New Species ◽  
Pacific Coast ◽  
Morphological Characters ◽  
The Pacific ◽  
Lowland Rainforest ◽  
Rich Flora ◽  
A New Species

Cyclolejeunea is a small neotropical genus of six species and a common epiphyllous hepatic in lowland and montane rainforests. We describe the new species Cyclolejeunea glimeana M.E.Reiner & Gradst. from wet lowland rainforest along the Pacific coast of Colombia (Chocó). The new species is characterized by the absence of innovations, entire leaf margins, leaf lobules without any indication of a tooth, and ligulate, thalloid gemmae without rhizoids. The combination of morphological characters seen in C. glimeana sets this species well apart from the remaining members of the genus and warrants its placement in a separate subgenus, C. subg. Chocolejeunea M.E.Reiner & Gradst. subg. nov. Ecologically, the new species stands out by its preference for palm trunks. The new species is a further addition to the unusually rich flora of the Chocó region.

scholarly journals EQUINODERMOS DEL PARQUE NACIONAL NATURAL ENSENADA DE UTRIA (PACIFICO COLOMBIANO)

2016 ◽  
Vol 21 ◽  
Author(s):  
Raul Neira O. ◽  
Perla Barba R. ◽  
Roberto Pardo A.
Keyword(s):  
Coral Reef ◽  
National Park ◽  
Pacific Coast ◽  
New Records ◽  
Rocky Shores ◽  
Sandy Shores ◽  
The Pacific ◽  
Shallow Subtidal ◽  
Colombian Pacific

Fifteen species of echinoderms (5 asteroids, 5 echinoids and 5 ophiuroids) are reported for Natural National Park Ensenada deUtria in the Pacific coast of Chocó, Colombia. For each species, we report its size and ecological observations. Two species, Mithrodia bradleyi and Encope ecuadorensis are new records for the Colombian Pacific coast and are described shortly., Most of the echinoderms found were associated to rocky shores, coral reef and sometimes sandy shores, except Ophiothríx spicuiata and Ophiactis savignyi, which were found living in association with the gorgonia Lophogorgia alba. Hesperocidaris asteriscus and Centrostephanus coronatus live in holes in coral or rock. These are mainly intertidal or shallow subtidal species.

The persistence and stability of fish assemblages within eelgrass meadows (Zostera marina) on the Pacific coast of Canada

2013 ◽  
Vol 70 (5) ◽  
pp. 775-784 ◽  
Author(s):  
Clifford L.K. Robinson ◽  
Jennifer Yakimishyn
Keyword(s):  
Zostera Marina ◽  
Pacific Coast ◽  
Fish Assemblages ◽  
Time Lag ◽  
Critical Element ◽  
Short Time Series ◽  
Ecosystem Integrity ◽  
The Pacific ◽  
Temporal Turnover ◽  
Short Time

The persistence and stability of fish assemblages found in 34 eelgrass (Zostera marina) meadows along the British Columbia coast was examined from 2004 to 2011. Assemblage persistence (nontrending species composition) and assemblage stability (constancy in abundance over time) were assessed using a time-lag regression method that tests for temporal turnover within short time series. Overall, 85% of the fish assemblages persisted, and 80% of the assemblages exhibited stability in abundance over the 8-year study. Environmental conditions in 33 of 34 meadows did not change substantially over the 8 years, and the low interannual variability may have contributed to the high persistence and stability of the fish assemblages. The lack of temporal turnover in relatively undisturbed eelgrass fish assemblage properties is a critical element for effective monitoring of coastal ecosystem integrity.

scholarly journals Low blue carbon storage in eelgrass (Zostera marina) meadows on the Pacific Coast of Canada

PLoS ONE ◽  
2018 ◽  
Vol 13 (6) ◽  
pp. e0198348 ◽  
Author(s):  
Victoria R. Postlethwaite ◽  
Aimee E. McGowan ◽  
Karen E. Kohfeld ◽  
Cliff L. K. Robinson ◽  
Marlow G. Pellatt
Keyword(s):  
Carbon Storage ◽  
Zostera Marina ◽  
Pacific Coast ◽  
Blue Carbon ◽  
The Pacific

Chaetozone and Caulleriella (Polychaeta: Cirratulidae) from the Pacific Coast of Costa Rica, with description of  eight new species

Zootaxa ◽  
2007 ◽  
Vol 1451 (1) ◽  
pp. 41-68 ◽  
Author(s):  
HARLAN K. DEAN ◽  
JAMES A. BLAKE
Keyword(s):  
New Species ◽  
Costa Rica ◽  
Pacific Coast ◽  
Benthic Communities ◽  
Morphological Characters ◽  
Body Region ◽  
Double Row ◽  
The Pacific ◽  
Anterior Body ◽  
Nuchal Organs

Polychaetes of the family Cirratulidae have often been poorly understood yet are very common and important components of intertidal and subtidal benthic communities. Five species of Chaetozone are here described from the Pacific coast of Costa Rica. Three of these species, C. acuminata sp. nov., C. cimar sp. nov., and C. nicoyana sp. nov., are new to science while C. corona Berkeley & Berkeley, 1941 and C. hedgpethi Blake, 1996 were previously described from California. C. acuminata sp. nov. has an elongate peristomium, a narrow anterior body region and elongate unidentate spines; the upper notosetal and lower neurosetal spines may be bidentate. C. cimar sp. nov. has notopodial and neuropodial spines in the mid-body region and partially complete posterior cinctures. C. nicoyana sp. nov. has a double row of posterior notopodial spines with fine recurved tips. Five new species in the genus Caulleriella are also described: C. cucula sp. nov., C. dulcei sp. nov., C. minuta sp. nov., C. moralesensis sp. nov., and C. murilloi sp. nov. C. cucula sp. nov. has dark, prominent nuchal organs, notopodial spines from the midbody to the posterior body region, capillary setae accompanying the spines in posterior setigers, bidentate neuropodial spines throughout. C. dulcei sp. nov. has accompanying capillary setae in all parapodial lobes except the posterior neuropodia, and notopodial spines from the anterior to mid-body region. C. minuta sp. nov. is a very small species with neuropodial spines beginning at setiger 4, capillaries accompanying the spines in posterior notopodia and segment 1 fused with setiger 1. C. moralesensis sp. nov. has notopodial spines from the anterior region and capillaries accompanying spines in both the notopodia and neuropodia. C. murilloi sp. nov. has dorsal tentacles emerging from setiger 3 and highly modified bidentate spines with low, rounded teeth or an encircling hood. Morphological characters which best aid in the differentiation of species in each genus are discussed including the use of peristomial annulations as a morphological character.

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