Melissa Grey

Magnitude and trends of marine fish curio imports to the USA

The curio trade in marine fishes has not previously been quantitatively analysed. As a contribution towards understanding the scale and conservation impact of such trade we summarize import and export data from the United States Fish and Wildlife Service for 1997–2001. At least 32 fish species were involved in the USA’s international trade in curios, of which 24 were included on the 2004 IUCN Red List of Threatened Species, with categorizations ranging from Endangered to Data Deficient. The USA apparently imported an annual total of approximately one million fish and 360 tonnes of fish parts, worth more than USD 1.7 million, although total volume declined over the 5 years of data. Fish curios imported to the USA reportedly came primarily from Taiwan and the Philippines, with 95% of curios obtained from wild populations. The three marine fish groups most traded for curios were sharks, seahorses and porcupinefishes. The value per individual fish fluctuated across years, with a considerable increase in the value of dried seahorses from 1997 to 2001. The trade probably adds to conservation concerns for at least some

Estimating multivariate selection gradients in the fossil record: a naticid gastropod case study

The purpose of this paper is to explore the possibility and utility of estimating multi- variate selection in fossil assemblages, using naticid gastropods as a case study. We used the pres- ence or the absence of a naticid borehole as an index of survival with respect to drilling attacks, enabling us to estimate the multivariate selection gradient exerted by this predator on the shell length and shell thickness of two bivalve genera, Astarte and Spisula. We hypothesized that naticid selection pressure would favor the survival of large, thick-shelled bivalve prey throughout the Ce- nozoic. Differential survival of prey was recorded over geologic time using processed bulk assemblages from the Miocene, Pliocene, and Pleistocene Epochs. Multivariate logistic regressions were per- formed by time period to determine if length and thickness were important factors affecting sur- vival. The direction and magnitude of selection on length and thickness for the two genera ranged from zero (no selection) to large positive or negative values. Only two selection coefficients were significant after sequential Bonferroni corrections: thin-shelled Astarte survived substantially bet- ter than thick-shelled Astarte during the Pleistocene ( b avggrad 52 1.23) and large Spisula survived slightly better than small Spisula during the Miocene Epoch (bavggrad 5 0.05). This is the first study using fossils to calculate multivariate selection gradients. It suggests that naticids were not necessarily strong agents of selection on two traits previously thought to be im- portant to survival of drilling attacks for two of their common prey species. We also show that multivariate selection gradient estimates differ from traditional predation intensity estimates but are superior for estimating the magnitude and direction of natural selection because they use dif- ferential mortality of different prey phenotypes rather than just absolute mortality from predation. This work is especially significant for research that involves estimating the relative importance of predation (naticid or otherwise) as an evolutionary force and will be useful for fossil studies where differential survival can be recorded.

The USA's international trade in fish leather, from a conservation perspective

This paper provides the first analysis of imports and exports of fish leather by the USA. Estimates of minimum levels of trade were obtained from the records of the United States Fish and Wildlife Service for 1997–2001, and possible conservation consequences were considered. Data show that imported leather items used the skins of at least 51 types of fish. Of the 41 identified to species level, six were freshwater fish, eight diadromous and 27 were fully marine. Eels and hagfishes (marketed as ‘eelskin’; eight named species), stingrays (10 named species) and sharks (15 named species) dominated the trade. An average of 725 000 fish-leather products, worth over US

Variation in Evolutionary Patterns Across the Geographic Range of a Fossil Bivalve

6 million, was imported each year to the USA. A significant decline in fish leather imports over the five-year period studied derived largely from changes in ‘eelskin’ imports. Fish leather in the USA was reportedly sourced primarily from the Republic of Korea, mainland China and Thailand, although the records were flawed. About 93% of leather products were obtained from wild fish. Exports from the USA totalled approximately 5% of imports by volume. Many of the fish species comprising the largest imports for leather were characterized by low resilience to exploitation, with one-third of known species considered threatened or near threatened by the World Conservation Union (IUCN). This pilot assessment indicates the need for better record keeping if sustainability of fish exploitation for leather is to be evaluated.

A New Species of Buchia (Bivalvia: Buchiidae) From British Columbia, Canada, With an Analysis of Buchiid Bipolarity

The fossil record is the only direct source of data for studying modes (patterns) and rates of morphological change over long periods of time. Determining modes and rates is important for understanding macroevolutionary processes, but just how modes and rates vary within a taxon, and why, remain largely unaddressed. We examined patterns of morphological change in the shell of the Mesozoic marine bivalve genus Buchia over its geographic and temporal range. Most modes conformed to either random walks or stasis, and both modes and rates showed variability between locations. For example, stasis was more common in deeper marine environments, whereas random walks occurred more often at the highest paleolatitudes studied. These results indicate that the environment can play an important role in shaping patterns of evolution.

SHAPE DIFFERENCES AMONG BOREHOLES DRILLED BY THREE SPECIES OF NATICID GASTROPODS

Abstract Critical reinvestigation of the bivalve Buchia cf. blanfordiana Jeletzky, 1965 from the Upper Jurassic of western British Columbia indicates that it is morphologically distinct from B. blanfordiana Stoliczka, 1866 of the Indo-Pacific region. We analyzed collections from relatively coeval sections containing multiple buchiid species from the Northern and Southern Hemispheres and used ten morphological characters to describe Buchia shell shape and size. We tested for taxonomic differences on left and right valves using a traditional morphometric approach with both linear and angular measurements and Fourier (outline) analyses. Phenetic discrimination revealed considerable overlap in the morphospace, but high classification rates between the two groups when compared with a step-wise discriminant analysis. This study supports the retention of the Indo-Pacific genera Australobuchia Zakharov, 1981 and Malayomaorica Jeletzky, 1963 and confirms that Buchia (=Australobuchia) blanfordiana is restricted to the Southern Hemisphere. Consequently, we propose the new name Buchia columbiana n. sp. for material assigned to Buchia cf. blanfordiana Jeletzky, 1965. Our results have implications for bipolarity and migration of the genus Buchia, supporting previous suggestions that buchiids formerly identified as Buchia from the Southern Hemisphere should be grouped as a separate genus.